CN115522169B - Composite deposition method of oxide hard coating and coated cutter - Google Patents

Abstract

The invention discloses a composite deposition method of an oxide hard coating and a coating tool. The coating tool comprises a tool substrate and an oxide hard coating. The oxide hard coating comprises multiple layers of alternately deposited cathode arc evaporation oxide layers and magnetron sputtering oxide layers. The cathode arc evaporation oxide layers have Cr and O, and the magnetron sputtering oxide layers have Al and O. The oxide hard coating is prepared by cathode arc evaporation/magnetron sputtering composite deposition, taking into account the fast deposition rate and high ionization rate of cathode arc evaporation technology and the small droplet characteristics of magnetron sputtering technology, significantly improving the surface quality of the oxide hard coating, and improving the hardness and density of the coating; a coherent interface is generated between the cathode arc evaporation oxide layer and the magnetron sputtering oxide layer, and the template effect of the cathode arc evaporation oxide layer promotes the crystallization of the magnetron sputtering oxide layer, thereby improving the mechanical properties of the coating tool. The invention can be widely used in the technical field of metal cutting tools.

Description

Composite deposition method of oxide hard coating and coated tool

Technical Field

The invention relates to the technical field of metal cutting tools, and in particular to a composite deposition method of an oxide hard coating and a coating tool.

Background Art

Oxide coatings (such as aluminum oxide, aluminum chromium oxide, etc.) deposited by cathodic arc evaporation have high hardness, good wear resistance and thermal stability, and have received extensive attention in recent years. However, the "droplet" defects produced by cathodic arc evaporation will increase the surface roughness of the coating and form micropores inside the coating, affecting the temperature resistance and wear resistance of the coating.

When using magnetron sputtering technology to prepare oxide coatings, although the formation of "droplet" defects can be suppressed, there are problems such as low deposition rate, low degree of crystallization, and the generation of a large number of metastable structures, which makes it difficult to meet industrial needs. High-power pulsed magnetron sputtering (HiPIMS) can obtain a high peak power density of kW/ ^cm2 through short pulses with a low duty cycle (<10%) to increase the plasma density and ionization of the sputtered material, which is conducive to the preparation of dense oxide coatings. At the same time, HiPIMS can suppress the hysteresis behavior of reactive sputtering and increase the deposition rate. However, the reverse attraction of the cathode to the target ions causes the deposition rate of HiPIMS to be still low when depositing oxide coatings. Therefore, it is necessary to develop a deposition technology for high-performance oxide hard coatings suitable for industrial applications.

Summary of the invention

In order to solve at least one of the above technical problems, the present invention provides a composite deposition method of an oxide hard coating and a coated tool, and the technical solution adopted is as follows.

The coated tool provided by the present invention comprises a tool substrate and an oxide hard coating, wherein the oxide hard coating is deposited on the tool substrate, and the oxide hard coating comprises multiple layers of alternately deposited cathode arc evaporated oxide layers and magnetron sputtered oxide layers, wherein the cathode arc evaporated oxide layers have Cr and O elements, and the magnetron sputtered oxide layers have Al and O elements.

In some embodiments of the present invention, the thickness of the alternating unit obtained in each alternating deposition cycle is 5 to 50 nm, and the thickness ratio of the cathode arc evaporated oxide layer to the magnetron sputtered oxide layer in the alternating unit is 1:3 to 3:1.

In certain embodiments of the present invention, the oxide hard coating has an oxygen content of 55 to 65 at.%, a Cr content of 10 to 25 at.%, and an Al content of 10 to 30 at.%.

The composite deposition method provided by the present invention adopts cathode arc evaporation technology combined with magnetron sputtering technology to alternately deposit cathode arc evaporation oxide layers and magnetron sputtering oxide layers on a tool substrate to obtain an oxide hard coating. The composite deposition method includes

The tool substrate is loaded into the reaction chamber, the reaction chamber is evacuated, heated, and ion-cleaned for the tool substrate;

The reaction chamber is evacuated, oxygen and inert gas are introduced, and the arc target and sputtering target are turned on.

In certain embodiments of the present invention, in the reaction chamber, the oxygen inlet position is closer to the arc target and farther from the sputtering target.

In certain embodiments of the present invention, in the reaction chamber, the inlet position of the inert gas is farther from the arc target and closer to the sputtering target.

In certain embodiments of the present invention, during the deposition of the oxide hard coating, the target current density of the arc target is 0.5 to 2.0 A/cm ² , the average power density of the sputtering target is 5 to 25 W/cm ² , the bias voltage is -50 to -250 V, the gas pressure is 0.4 to 3.0 Pa, the rotation rate of the support for loading the tool substrate is 0.5 to 5 r/min, and the deposition time is 30 to 360 min.

The embodiments of the present invention have at least the following beneficial effects: the cathode arc evaporation/magnetron sputtering composite deposition method is used to prepare the oxide hard coating, which takes into account the fast deposition rate and high ionization rate of the cathode arc evaporation technology and the small droplet characteristics of the magnetron sputtering technology, and can significantly improve the surface quality of the oxide hard coating, and improve the hardness and density of the coating; a coherent interface can be generated between the cathode arc evaporation oxide layer and the magnetron sputtering oxide layer, and the template effect of the cathode arc evaporation oxide layer can promote the crystallization of the magnetron sputtering oxide layer, and improve the mechanical properties of the coating tool. The present invention can be widely used in the field of metal cutting tool technology.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments with reference to the following drawings.

FIG1 is a poisoning hysteresis curve of a high power pulsed magnetron sputtering (HiPIMS) Al target drawn using the gas inlet path used in Comparative Example 1 and Example 1 during cathode arc evaporation/high power pulsed magnetron sputtering composite deposition of Cr-O/Al-O coating.

Figure 2 is a scanning electron microscope image of the Cr-O/Al-O coating (a) deposited by cathode arc evaporation/high-power pulsed magnetron sputtering in Example 1, the (Cr,Al) ₂ O ₃ coating (b) deposited by cathode arc evaporation in Comparative Example 2, and the Al ₂ O ₃ coating (c) prepared by high-power pulsed magnetron sputtering in Comparative Example 3.

Figure 3 is a grazing incidence X-ray diffraction pattern of the Cr–O/Al–O coating deposited by cathode arc evaporation/high power pulsed magnetron sputtering in Example 1, the (Cr,Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Example 2, and the Al ₂ O ₃ coating prepared by high power pulsed magnetron sputtering (HiPIMS) in Comparative Example 3.

FIG. 4 shows the microscopic nano-multilayer structure and component distribution of the oxide hard coating of Example 1 obtained by cathode arc evaporation/high-power pulsed magnetron sputtering composite deposition in the present invention.

FIG. 5 is a schematic diagram of the structure of an oxide hard coating obtained by cathode arc evaporation/magnetron sputtering composite deposition in the present invention.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below in conjunction with FIGS. 1 to 5 , examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The present invention relates to a coated tool, which comprises a tool substrate and an oxide hard coating, wherein the oxide hard coating is deposited on the tool substrate, and the oxide hard coating comprises multiple layers of alternately deposited cathode arc evaporated oxide layers and magnetron sputtered oxide layers, wherein the cathode arc evaporated oxide layers contain Cr and O elements, and the magnetron sputtered oxide layers contain Al and O elements.

The tool base material is one of high speed steel, cemented carbide, metal ceramic, ceramic and cubic boron nitride.

The coated tool designed by the present invention is widely used in the mechanical processing of carbon steel, cast iron, stainless steel and titanium alloy materials, and the mechanical processing includes turning, milling, drilling, boring and grinding.

As an embodiment, the thickness of the alternating unit obtained by each alternating deposition cycle (modulation period) is 5 to 50 nm. In the alternating unit, the thickness ratio (modulation ratio) of the cathode arc evaporated oxide layer and the magnetron sputtered oxide layer is 1:3 to 3:1, and the thickness of the cathode arc evaporated oxide layer and the magnetron sputtered oxide layer can be the same or different. By controlling the modulation period and the modulation ratio, a coherent interface is generated between the cathode arc evaporated oxide layer and the magnetron sputtered oxide layer. If the thickness of the modulation period is too large or the modulation ratio is not appropriate, it is difficult to generate a coherent interface, the crystallization of the magnetron sputtered oxide layer cannot be promoted, and the hardness of the coating cannot be guaranteed.

It can be understood that by regulating the modulation structure (modulation period and modulation ratio) of the cathode arc evaporated oxide layer and the magnetron sputtered oxide layer, a coherent interface can be generated between the two. At this time, the template effect of the cathode arc evaporated oxide layer can promote the crystallization of the magnetron sputtered oxide layer, improve the mechanical properties of the coated tool and extend the service life of the coated tool.

As an embodiment, in the oxide hard coating, the oxygen content is 55 to 65 at.%, and the Al content is 10 to 30 at.%, ensuring that the oxide hard coating has a near-ideal stoichiometric ratio and that there is no large amount of metal phase inside. If there is a large amount of metal phase in the coating, the hardness of the coating will decrease.

In some examples, the oxide hard coating comprises Cr, Al, and O, wherein Al: 15 to 30 at.%, Cr: 10 to 25 at.%, and O: 55 to 65 at.%. Specifically, the composition of the cathode arc evaporated oxide layer is Cr-O, and the composition of the magnetron sputtered oxide layer is Al-O.

The invention relates to a composite deposition method for an oxide hard coating. The composite deposition method adopts cathode arc evaporation technology combined with magnetron sputtering technology to alternately deposit cathode arc evaporation oxide layers and magnetron sputtering oxide layers on a tool substrate.

It can be understood that cathode arc evaporation has a fast deposition rate and a high ionization rate, and the obtained coating has high hardness and a dense structure. The coating surface obtained by magnetron sputtering is smooth. The oxide hard coating obtained by cathode arc evaporation combined with magnetron sputtering composite deposition has fewer droplets and a fast deposition rate.

The composite deposition method includes the following process: loading the tool substrate into the reaction chamber; vacuuming the reaction chamber, heating, and ion cleaning the tool substrate; vacuuming the reaction chamber, introducing oxygen and inert gas, and turning on the arc target and sputtering target. The tool substrate in the bracket rotates periodically in front of the arc target and sputtering target to obtain an oxide hard coating with a nano multilayer structure.

Specifically, the reaction chamber is heated to 100 to 400° C., and the ion source is turned on to perform ion cleaning on the surface of the tool substrate.

The oxide hard coating prepared by alternating deposition of cathode arc evaporation and magnetron sputtering exhibits a nano-multilayer structure. By adjusting the modulation period and modulation ratio and utilizing the template effect of the cathode arc evaporated oxide layer to promote the structure of the magnetron sputtered oxide layer, the shortcomings of magnetron sputtering oxide coatings such as difficulty in crystallization and low hardness can be improved, so that the oxide coating has good surface quality and mechanical properties.

The parameters of the alternatingly deposited nano-multilayer structure are mainly related to the rotation rate of the bracket loading the tool substrate, the target current density of the arc target and the average power density of the sputtering target. The composition and structure of the oxide hard coating can be flexibly controlled by adjusting the target material composition and deposition parameters. It has strong operability and good controllability, reduces the complexity of the coating equipment and process, and is suitable for industrial production.

Specifically, during the deposition of the oxide hard coating: the target current density of the arc target is 0.5 to 2.0 A/cm ² , the bias voltage is -50 to -250 V, the gas pressure is 0.4 to 3.0 Pa, the average power density of the sputtering target is 5 to 25 W/cm ² , the rotation rate of the support for loading the tool substrate is 0.5 to 5 r/min, and the deposition time is 30 to 360 min.

As an implementation method, the magnetron sputtering technology adopts direct current magnetron sputtering. Of course, as an alternative, the magnetron sputtering technology can also adopt pulsed magnetron sputtering or high-power pulsed magnetron sputtering.

In order to obtain an ideal stoichiometric oxide hard coating and prevent the sputtering target from being poisoned, the gas inlet path in the reaction chamber should be reasonably designed. Specifically, the oxygen inlet position is closer to the arc target and farther from the sputtering target, so that the oxygen inlet position is away from the sputtering target and closer to the arc target. In some examples, the oxygen inlet position is set in front of the arc target, or the oxygen inlet position is set close to the arc target.

It is understandable that, on the one hand, during the operation of arc targets and sputtering targets, an aluminum oxide layer is easily generated on the surface of the sputtering target. Due to the low energy of sputtering ions, the surface oxide cannot be removed in time, resulting in the poisoning of the sputtering target. When the oxide accumulates to a certain thickness, the sputtering rate of the target material drops seriously, and arcing is likely to occur, causing the target material to fail to work normally. However, when the arc target evaporates, the arc spots on the surface have higher energy, which can remove the oxide layer formed on the surface of the target material in time, and it is not easy to form oxides on the target surface. Under suitable deposition conditions, it can work stably for a long time. Therefore, the oxygen inlet position is designed to be close to the arc target, so that the arc target consumes oxygen first, so that the sputtering target can work at a higher oxygen flow rate, which is conducive to ensuring the ideal chemical composition of the coating.

Furthermore, in the reaction chamber, the inert gas inlet position is farther from the arc target and closer to the sputtering target. Specifically, the inert gas inlet position is set in front of the sputtering target, or the inert gas inlet position is set close to the sputtering target, thereby delaying the poisoning of the sputtering target and increasing the sputtering rate of the sputtering target.

It is understandable that the inert gas is mainly used to generate inert gas ions to bombard the sputtering target, so that the target ions escape from the target surface. Specifically, the inert gas is one of helium, neon, argon, krypton and xenon.

The present invention is described in detail below with specific embodiments. It should be noted that the following description is only for illustrative purposes rather than for any specific limitation of the present invention.

Comparative Example 1

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the sputtering target, and the inert gas inlet position is set in front of the arc target.

Oxygen and argon gases were introduced, and a Cr target as an arc target and an Al target as a sputtering target were turned on.

The target current density of the arc target was adjusted to 1.0A/ ^cm2 , the bias voltage was -100V, the gas pressure was 0.4Pa, and the rotation speed of the support was 2r/min. The magnetron sputtering technology used high-power pulsed magnetron sputtering (HiPIMS), the average power density of the sputtering target was 5W/ ^cm2 , the duty cycle was 2.5%, and the frequency was 500Hz. The deposition time was 120min.

After the above steps, a coated tool having a cathode arc evaporation/high-power pulsed magnetron sputtering composite deposited oxide coating is obtained. In the obtained oxide hard coating, the composition of the cathode arc evaporation oxide layer is Cr-O, and the composition of the high-power pulsed magnetron sputtering oxide layer is Al-O.

Comparative Example 2

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the arc target, and the inert gas inlet position is set in front of the sputtering target.

Oxygen and argon were introduced, the CrAl target as the arc target was turned on, the target current density of the arc target was adjusted to 1.0 A/cm ² , the bias voltage to -100 V, the gas pressure to 0.4 Pa, the rotation speed of the support to 2 r/min, and the deposition time to 120 min.

After the above steps, a coated tool having a cathode arc evaporation deposited oxide hard coating is obtained, and the composition of the oxide hard coating is Cr–Al–O.

Comparative Example 3

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the arc target, and the inert gas inlet position is set in front of the sputtering target.

Oxygen and argon gases were introduced, and the Al target serving as a sputtering target was turned on.

The magnetron sputtering technology uses high power pulsed magnetron sputtering (HiPIMS), and the average power density of the sputtering target is adjusted to 5 W/cm ² , the duty cycle is 2.5%, the frequency is 500 Hz, the bias voltage is set to –100 V, the gas pressure is 0.4 Pa, the rotation speed of the bracket is 2 r/min, and the deposition time is 120 min.

After the above steps, a coated tool with an oxide hard coating deposited by high power impulse magnetron sputtering (HiPIMS) is obtained, and the composition of the oxide hard coating is Al ₂ O ₃ .

Example 1

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the arc target, and the inert gas inlet position is set in front of the sputtering target.

Oxygen and argon were introduced, the Cr target as the arc target and the Al target as the sputtering target were turned on, and the magnetron sputtering technology adopted was high power pulsed magnetron sputtering (HiPIMS).

The target current density of the arc target was adjusted to 1.0A/cm ² , the bias voltage was –100V, the gas pressure was 0.4Pa, and the rotation speed of the holder was 2r/min. The average power density of the sputtering target was 5W/cm ² , the duty cycle was 2.5%, and the frequency was 500Hz. The deposition time was 120min, and the thickness of the obtained oxide hard coating was 2.4μm.

After the above steps, a coated tool with a cathode arc evaporation/high-power pulsed magnetron sputtering composite deposited oxide hard coating is obtained, and the thickness of the alternating unit obtained in each alternating deposition cycle (modulation cycle) is 10nm, wherein the thickness ratio of the cathode arc evaporation oxide layer to the magnetron sputtering oxide layer in each alternating unit is 2:1. The composition of the cathode arc evaporation oxide layer is Cr-O, the composition of the magnetron sputtering oxide layer is Al-O, and the content of each element in the oxide hard coating is as follows: Al: 15at.%, Cr: 30at.%, O: 55at.%.

Table 1 is a comparison of the composition and hardness of the Cr-O/Al-O coatings prepared by cathode arc evaporation/high-power pulsed magnetron sputtering composite deposition technology using different gas inlet methods in Example 1 and Comparative Example 1.

Table 1

From Table 1, it can be seen that the O content in the Cr-O/Al-O coating prepared by the reasonable air intake method in Example 1 is 55 at.%, close to the ideal stoichiometric ratio of 60 at.%, and exhibits a hardness of 24.7 GPa; while the O content in the Cr-O/Al-O coating prepared by the comparative example 1 without using different air intake methods is only 26 at.%, the metal content in the coating is relatively high, and the hardness is only 12.8 GPa. This result shows that a reasonable air intake path is the basis of the composite deposited oxide hard coating.

Table 2 compares the composition and hardness of the Cr-O/Al-O coating deposited by cathode arc evaporation/high power pulsed magnetron sputtering in Example 1, the (Cr,Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Example 2, and the Al ₂ O ₃ coating prepared by high power pulsed magnetron sputtering in Comparative Example 3.

Table 2

It can be seen from Table 2 that the O content in the Cr-O/Al-O coating prepared by cathode arc evaporation/high-power pulsed magnetron sputtering composite deposition technology in Example 1 is similar to that of the (Cr, Al) ₂ O ₃ coating prepared by conventional cathode arc evaporation in Comparative Example 2 and the Al ₂ O ₃ coating prepared by high-power pulsed magnetron sputtering in Comparative Example 3, and both are close to the ideal stoichiometric ratio. The hardness of the composite deposited Cr-O/Al-O in Example 1 is similar to that of the (Cr, Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Example 2, indicating that the cathode arc evaporation/high-power pulsed magnetron sputtering composite deposition technology can be used to prepare an oxide hard coating with performance close to that of cathode arc evaporation, and its deposition efficiency is higher than that of conventional cathode arc evaporation. Among them, the Al ₂ O ₃ coating prepared by HiPIMS in Comparative Example 3 has a loose structure and a large number of pores inside, and is mainly composed of an amorphous phase, so the coating hardness is low.

Figure 1 shows the hysteresis curve of the Al target during high-power pulsed magnetron sputtering (HiPIMS) using the gas inlet paths used in Comparative Example 1 and Example 1 for composite deposition of Cr-O/Al-O coatings. The poisoning curve drawn using the gas inlet path of Comparative Example 1 shows that when the oxygen flow rate exceeds 20 sccm, the Al target voltage begins to drop, the target material working state changes from metal mode to poisoning mode, and the Al target material begins to arc; when the oxygen flow rate exceeds 26 sccm, the Al target voltage drops to about 590V, indicating that the target material has been completely poisoned at this time. When the gas inlet path of Example 1 is used, a higher oxygen flow rate of 27 sccm is required for the target material to enter the transition mode from the metal mode, and the Al target can still work stably at this time.

FIG2 is a scanning electron microscope image of the Cr–O/Al–O coating (a) deposited by cathode arc evaporation/high-power pulsed magnetron sputtering in Example 1, the (Cr,Al) ₂ O ₃ coating (b) deposited by cathode arc evaporation in Comparative Example 2, and the Al ₂ O ₃ coating (c) prepared by high-power pulsed magnetron sputtering in Comparative Example 3. It can be seen from the figure that the composite-deposited Cr–O/Al–O coating in Example 1 and the (Cr,Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Example 2 have dense structures, while the Al ₂ O ₃ coating prepared by HiPIMS in Comparative Example 3 has a loose structure and a large number of cracks on the surface. The surface droplet defects of the composite-deposited Cr–O/Al–O coating in Example 1 are significantly lower than those of the (Cr,Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Example 2. The above results show that the composite deposition technology can maintain the density of the coating and reduce the surface droplet defects when preparing the oxide hard coating.

Figure 3 shows the GIXRD spectra of the Cr-O/Al-O coating deposited by cathode arc evaporation/high-power pulsed magnetron sputtering in Example 1, the (Cr,Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Example 2, and the Al ₂ O ₃ coating prepared by high-power pulsed magnetron sputtering in Comparative Example 3. It can be observed in the figure that the composite deposited Cr-O/Al-O coating in Example 1 and the (Cr,Al) ₂ O ₃ coating deposited by cathode arc evaporation in Comparative Examples 2 and 3 all show a single-phase face-centered cubic structure, while no obvious diffraction peak is detected in the Al ₂ O ₃ coating prepared by HiPIMS in Comparative Example 3, and the coating is amorphous. This result shows that the composite deposition technology can effectively improve the problem of poor crystallization when preparing oxide hard coatings by magnetron sputtering technology.

Figure 4 shows the microscopic nano multilayer structure and composition distribution of the oxide hard coating of Example 1 obtained by cathode arc evaporation/high-power pulsed magnetron sputtering composite deposition in the present invention. The bright field image of Figure 4a shows that the coating exhibits a multi-layer alternating layered structure, and the overall columnar crystal growth morphology. In the high-resolution TEM image of Figure 4b, the lattice fringes in a single grain continuously penetrate multiple Cr-O and Al-O sublayers, indicating that epitaxial growth has occurred between the Cr-O layer deposited by cathode arc evaporation and the Al-O layer of HiPIMS. Figure 4c is a high-magnification STEM image of the coating and the composition surface distribution of EDS, which further proves the existence of a multilayer structure inside the coating. The measured modulation period of the coating is about 9nm, and the thickness of the Cr-O and Al-O layers are about 6nm and 3nm, respectively.

Example 2

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the arc target, and the inert gas inlet position is set in front of the sputtering target.

Oxygen and argon are introduced, the Cr target as the arc target and the Al target as the sputtering target are turned on, and the magnetron sputtering technology adopts pulsed magnetron sputtering.

The target current density of the arc target was adjusted to 1.5A/ ^cm2 , the bias voltage was -100V, the gas pressure was 2.0Pa, and the rotation speed of the holder was 3r/min. The average power density of the sputtering target was 15W/ ^cm2 , the duty cycle was 50%, and the frequency was 80kHz. The deposition time was 120min, and the thickness of the obtained oxide hard coating was 3.6μm.

After the above steps, a coated tool with a cathode arc evaporation/pulse magnetron sputtering composite deposited oxide hard coating is obtained, and the thickness of each alternating unit is 15nm, wherein the thickness ratio of the cathode arc evaporation oxide layer to the magnetron sputtering oxide layer is 1:1. The composition of the cathode arc evaporation oxide layer is Cr-O, the composition of the magnetron sputtering oxide layer is Al-O, and the content of each element in the oxide hard coating is as follows: Al: 20at.%, Cr: 23at.%, O: 57at.%.

Example 3

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the arc target, and the inert gas inlet position is set in front of the sputtering target.

Oxygen and argon are introduced, the Cr target as the arc target and the Al target as the sputtering target are turned on, and the magnetron sputtering technology adopts DC magnetron sputtering.

The target current density of the arc target was adjusted to 0.5 A/cm ² , the bias voltage was -150 V, the gas pressure was 3.0 Pa, and the rotation speed of the holder was 0.5 r/min. The average power density of the sputtering target was 25 W/cm ² . The deposition time was 60 min, and the thickness of the obtained oxide hard coating was 3 μm.

After the above steps, a coated tool with a cathode arc evaporation/magnetron sputtering composite deposited oxide hard coating is obtained, and the thickness of each alternating unit (modulation period) is 50nm, wherein the thickness ratio of the cathode arc evaporation oxide layer to the magnetron sputtering oxide layer is 1:3. The composition of the cathode arc evaporation oxide layer is Cr-O, the composition of the magnetron sputtering oxide layer is Al-O, and the content of each element in the oxide hard coating is as follows: Al: 30at.%, Cr: 10at.%, O: 60at.%.

Example 4

The tool substrate is made of cemented carbide. After ultrasonic cleaning and drying, the tool substrate is loaded into the reaction chamber of the coating furnace, heated and vacuumed to the set conditions, and ion cleaning is performed on the tool substrate.

The oxygen inlet position is set near the arc target, and the inert gas inlet position is set in front of the sputtering target.

Oxygen and argon are introduced, the Cr target as the arc target and the Al target as the sputtering target are turned on, and the magnetron sputtering technology adopts DC magnetron sputtering.

The target current density of the arc target was adjusted to 2A/cm ² , the bias voltage was -50V, the gas pressure was 1.0Pa, and the rotation speed of the holder was 5r/min. The average power density of the sputtering target was 7W/cm ² . The deposition time was 200min, and the thickness of the obtained oxide hard coating was 6μm.

After the above steps, a coated tool with a cathode arc evaporation/magnetron sputtering composite deposited oxide hard coating is obtained, and the thickness of each alternating unit is 5nm, wherein the thickness ratio of the cathode arc evaporation oxide layer to the magnetron sputtering oxide layer is 3:1. The composition of the cathode arc evaporation oxide layer is Cr-O, the composition of the magnetron sputtering oxide layer is Al-O, and the content of each element in the oxide hard coating is as follows: Al: 15at.%, Cr: 25at.%, O: 65at.%.

In the description of this specification, if the reference terms "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

In the description of the invention, if the patent name contains "、", it indicates an "and" relationship, not an "or" relationship. For example, if the patent name is "A, B", it means that the content of the invention is: the technical solution with the subject name A and the technical solution with the subject name B.

Claims (3)

1. A composite deposition method for an oxide hard coating, characterized in that: the composite deposition method uses cathode arc evaporation technology combined with magnetron sputtering technology to alternately deposit cathode arc evaporation oxide layers and magnetron sputtering oxide layers on a tool substrate to obtain an oxide hard coating, the composite deposition method comprising The tool substrate is loaded into the reaction chamber, the reaction chamber is evacuated, heated, and ion-cleaned for the tool substrate; The reaction chamber is evacuated, oxygen and inert gas are introduced, and the arc target and sputtering target are turned on; in the reaction chamber, the oxygen inlet position is closer to the arc target and farther from the sputtering target, and the inert gas inlet position is farther from the arc target and closer to the sputtering target; In the process of depositing the oxide hard coating, the target current density of the arc target is 0.5 to 2.0 A/cm ² , the average power density of the sputtering target is 5 to 25 W/cm ² , the bias voltage is -50 to -150 V, and the gas pressure is 0.4 to 3.0 Pa; the thickness of the alternating unit obtained in each alternating deposition cycle is 5 to 50 nm, the thickness ratio of the cathode arc evaporated oxide layer and the magnetron sputtered oxide layer in the alternating unit is 1:3 to 3:1, and the deposition time is 60 to 360 min. 2. The composite deposition method of oxide hard coating according to claim 1 is characterized in that the rotation rate of the bracket loading the tool substrate is 0.5 to 5 r/min. 3. A coated tool, characterized in that it comprises a tool substrate and an oxide hard coating, wherein the oxide hard coating is deposited on the tool substrate by the composite deposition method according to claim 1 or 2, and the oxide hard coating comprises multiple layers of alternately deposited cathode arc evaporated oxide layers and magnetron sputtered oxide layers, wherein the cathode arc evaporated oxide layers have Cr and O elements, and the magnetron sputtered oxide layers have Al and O elements; The oxide hard coating has an oxygen content of 55 to 65 at.%, Cr: 10 to 25 at.%, and Al content of 10 to 30 at.%; The thickness of the alternating unit obtained in each alternating deposition cycle is 5 to 50 nm, and the thickness ratio of the cathode arc evaporated oxide layer to the magnetron sputtered oxide layer in the alternating unit is 1:3 to 3:1.