CN116005031A - Ceramic bearing manufacturing method - Google Patents

Abstract

The invention provides a method for manufacturing a ceramic bearing, which belongs to the technical field of bearing manufacturing, and comprises the following steps: uniformly mixing ceramic matrix powder and nanometer copper powder to form a blank; the blank is impact formed at high speed in a vacuum environment. Wherein: the nano copper powder is used as a binder, blanks are compacted through a high-speed impact forming process, instantaneous friction force among blank powder generates instantaneous high temperature to melt the nano copper powder, and the blanks are subjected to plastic shaping instantaneously to obtain the ceramic bearing. Compared with the prior art, the invention has the advantages of simple process, rapid forming, low cost and easy mass production, and meanwhile, the rotating speed of the manufactured bearing can reach over 9000 revolutions per minute, no noise exists in the rotating process, and the requirements of equipment on high rotating speed and silence are met. In addition, the bearing does not depend on lubricating oil in use, so that the service life of the bearing can be prolonged.

Description

A kind of ceramic bearing manufacturing method

technical field

The invention relates to the technical field of precision bearing manufacture, in particular to a method for manufacturing a ceramic bearing.

Background technique

Bearing is an important basic component of various mechanical equipment. Its main function is to support the mechanical rotating body to reduce its friction coefficient during the transmission process and ensure its rotation accuracy. According to the different friction properties of moving parts, bearings can be divided into rolling bearings and sliding bearings. Among them: sliding bearings are made of wear-resistant materials and are used in low-speed, light-load, and difficult-to-maintain mechanical rotating parts. They need to have good high temperature resistance, corrosion resistance, thermal conductivity, and fatigue resistance.

Due to the advantages of high temperature resistance, corrosion resistance, high elastic modulus and long service life of ceramic materials, ceramic sintering technology is usually used to manufacture ceramic bearings. This traditional ceramic bearing sintering process has at least the following defects:

1. The existing sintering process has strict requirements on production conditions, long manufacturing cycle and high cost.

2. During the rotation of the bearing, the noise is large and the speed is low, which can no longer meet the needs of the equipment for quietness and high speed.

3. Lubricating oil must be used in the bearing, and it will be scrapped soon after there is no lubricating oil.

Contents of the invention

The present invention aims to propose a ceramic bearing manufacturing method, in order to at least partly solve at least one of the above technical problems.

In order to solve the above technical problems, the present invention provides a ceramic bearing manufacturing method, including:

Mix ceramic matrix powder and nano-copper powder evenly to form a billet;

The blank is impact-formed at high speed in a vacuum environment.

According to a preferred embodiment of the present invention, the ceramic substrate is selected from at least one of boron nitride, silicon nitride, alumina, silicon carbide, and zirconia.

According to a preferred embodiment of the present invention, the ceramic matrix powder is boron nitride powder, the mass percentage of boron nitride powder is 55-85%, and the mass percentage of nano-copper powder is 45-15%.

According to a preferred embodiment of the present invention, the ceramic matrix powder is boron nitride powder and silicon nitride powder, the mass percentage of boron nitride powder is: 35-45%, and the mass percentage of silicon nitride powder is: 25-35% , the mass percentage of nanometer copper powder is: 25-30%.

According to a preferred embodiment of the present invention, the ceramic matrix powder is boron nitride powder, silicon nitride powder and alumina powder, the mass percentage of boron nitride powder is: 35-55%, and the mass percentage of silicon nitride powder is: 15-25%, the mass percentage of alumina powder is 10-18%, and the mass percentage of nano-copper powder is 15-20%.

According to a preferred embodiment of the present invention, before mixing, 0.15-0.25% by mass dispersant is also added.

According to a preferred embodiment of the present invention, the particle size of the ceramic matrix powder is 15-120 μm.

According to a preferred embodiment of the present invention, the ceramic matrix powder and nano-copper powder are uniformly mixed to form a billet through wet ball milling or ball milling; wherein:

The wet ball milling process is as follows: the mass ratio of balls to materials is 5-30:1, the mixing speed is 80-600r/min, and the mixing time is 1-6h; the solvent added in the wet ball milling process is water, alcohol or acetone ;

The ball milling treatment is as follows: the mass ratio of balls to materials is 10-20:1, the mixing speed is 50-400 r/min, and the mixing time is 12-24 hours.

According to a preferred embodiment of the present invention, the high-speed impact forming of the blank in a vacuum environment includes:

Vacuum the bearing vacuum chamber;

Fill the blank into the vacuum cavity of the bearing;

Apply a pressure of 50-70MPa and impact and compact the billet at a speed of 50-70m/s for 1-2min, so that the billet undergoes plastic deformation to obtain a bearing;

Open the outlet of the bearing vacuum chamber, and the bearing will drop into the finished product box.

To sum up, in the manufacturing method of the ceramic bearing of the present invention, the ceramic matrix powder and nano-copper powder are uniformly mixed to form a billet, and the billet is impact-formed at high speed in a vacuum environment. Among them: nano-copper powder is used as a binder, and its melting point (about 40°C) is low in a vacuum environment. The billet is compacted through a high-speed impact forming process, and the instantaneous friction between the billet powders generates an instantaneous high temperature to melt the nano-copper powder. The blank is plastically shaped to obtain a ceramic bearing. Compared with the prior art, the present invention has at least the following beneficial effects:

1. Simple process, rapid prototyping, low cost, and easy mass production.

2. The speed of the manufactured bearing can reach more than 9,000 revolutions per minute, and there is no noise during the rotation process, which meets the needs of the equipment for high speed and silence.

3. The high-speed impact forming process is adopted to make the bearing surface smooth, and the bearing does not rely on lubricating oil during use, which can prolong the service life of the bearing.

Description of drawings

Fig. 1 is a schematic flowchart of a method for manufacturing a ceramic bearing provided by an embodiment of the present invention.

Detailed ways

The characteristics and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only configured to explain the present invention, not to limit the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

The present invention provides a method for manufacturing a ceramic bearing, as shown in Figure 1, the method comprising:

S1, uniformly mixing ceramic matrix powder and nano-copper powder to form a billet;

Wherein: the ceramic substrate can be selected from at least one of boron nitride, silicon nitride, aluminum oxide, silicon carbide, and zirconium oxide. The particle size of the ceramic matrix powder is 15-120 μm, and the nano-copper powder is used as a binder.

The mass percentage of the ceramic matrix powder and the nano-copper powder is determined according to the components of the ceramic matrix powder. In one example, the ceramic matrix powder is boron nitride powder, the mass percentage of boron nitride powder is 55-85%, and the mass percentage of nano-copper powder is 45-15%. In another example, the ceramic matrix powder is boron nitride powder and silicon nitride powder, the mass percentage of boron nitride powder is: 35-45%, the mass percentage of silicon nitride powder is: 25-35%, and nano-copper powder The mass percentage is: 25-30%. In yet another example, the ceramic matrix powder is boron nitride powder, silicon nitride powder and alumina powder, the mass percentage of boron nitride powder is: 35-55%, the mass percentage of silicon nitride powder is: 15-25%, The mass percentage of alumina powder is 10-18%, and the mass percentage of nano-copper powder is 15-20%.

Further, in order to avoid spontaneous coagulation and agglomeration of powders during the mixing process, an appropriate amount of dispersant can be added to each powder raw material before mixing to form a protective layer on the surface of powder particles and reduce the agglomeration effect between powders. Optionally, the dispersant may be: ferric ester coupling agent, lauric acid ester coupling agent, stearic acid, oleic acid, etc. Among them: ferric acid ester coupling agent and lauric acid ester coupling agent are adsorbed on the surface of particles in the form of covalent bonds, and stearic acid and oleic acid are adsorbed on the surface of particles in the form of hydrogen bonds through Lewis acid-base reaction. In this embodiment, the mass percentage of the dispersant is controlled at 0.15-0.25%, so as not to block the pyrolysis discharge channel of the binder, prevent the discharge of the binder, and form defects such as bubbles and cracks on the surface.

In this embodiment, powder raw materials may be mixed by wet ball milling or ball milling. The specific mixing time and mixing speed depend on the mixing method used. In one example, wet ball milling treatment is adopted, and the wet ball milling treatment is as follows: the mass ratio of ball to material is 5-30:1, the mixing speed is 80-600r/min, and the mixing time is 1-6h; The solvent added in the ball milling process is water, alcohol or acetone. In another example, ball milling treatment is adopted, and the ball milling treatment is as follows: the mass ratio of balls to materials is 10-20:1, the mixing speed is 50-400 r/min, and the mixing time is 12-24 hours.

S2. High-speed impact forming of the billet in a vacuum environment.

Among them: high-speed impact forming refers to the process of plastic processing and forming of materials with instantaneous impact force generated by sudden release of energy. In this embodiment, the billet is impact-formed at high speed by controlling the impact velocity in a vacuum environment. In the high-speed impact forming process: nano-copper powder is used as a binder, and its melting point (about 40°C) is low in a vacuum environment. The billet is compacted by high-speed impact force, and the instantaneous friction between the billet powders generates instantaneous high temperature. The powder is melted, and the billet is plastically shaped instantly to obtain a ceramic bearing.

Exemplarily, this step may include:

S21, vacuumize the bearing vacuum chamber;

Among them: Bearing molds of various shapes and sizes can be installed in the bearing vacuum chamber. Before this step, a bearing mold can be selected according to the shape and size of the bearing to be manufactured, installed in the bearing vacuum cavity, and the entire bearing vacuum cavity is evacuated by a vacuum pump.

S22, filling the blank into the bearing vacuum cavity;

In this embodiment, the blanks filled into the bearing vacuum cavity each time are determined according to the shape and size of the bearing to be manufactured, so as to ensure that the manufactured bearing meets the shape and size requirements and provide bearing accuracy.

Exemplarily, before this step, the volume V of the bearing to be manufactured can be calculated in advance according to the shape and size of the bearing to be manufactured, and the volume of the blank filled into the vacuum cavity of the bearing each time is between n (1.2-1.5)V. Among them: n is the number of bearings that can be produced for each filling.

S23. Applying a pressure of 50-70 MPa and impacting and compacting the billet at a speed of 50-70 m/s for 1-2 minutes, causing the billet to undergo plastic deformation to obtain a bearing;

The billet is compacted by high-speed impact force, and the instantaneous friction between the powders of the billet generates instantaneous high temperature to melt the nano-copper powder, and the billet is plastically shaped instantly to obtain a ceramic bearing.

S24. Open the outlet of the bearing vacuum chamber, and the bearing falls into the finished product box.

Through S21-S24, one bearing is produced and formed, and the cycle S24 is repeated to produce other bearings until the blank in the bearing vacuum chamber is used up, and a batch of bearings are produced and formed. The cycle S1-S24 is repeated to produce other batches of bearings.

The present invention will be further described below in conjunction with specific examples, but is not limited thereto.

Example 1

A method of manufacturing a ceramic bearing, the method comprising:

S101, preparing boron nitride powder and nano-copper powder with a particle size of 75 μm.

In this step, the boron nitride powder can be passed through a 200-mesh sieve several times to obtain boron nitride powder with a particle size of 75 μm. Among them: nano-copper powder refers to copper particle powder with a particle size between 1 and 100 nm, which can be prepared by chemical vapor deposition, evaporation condensation, mechanical pulverization, and the like.

S102. Weigh 75.20% of boron nitride powder, 24.62% of nano-copper powder, and 0.18% of dispersant according to mass percentage.

Wherein: the dispersant can be: ferric ester coupling agent, lauric acid ester coupling agent, stearic acid, or oleic acid, which is not specifically limited in the present invention.

S103, uniformly mixing the boron nitride powder, nano-copper powder and dispersant through wet ball milling to form a billet;

Optionally, the boron nitride powder and nano-copper powder can be vacuum-dried first, and balls with a mass ratio of ball to material of 28:1 are selected, the mixing speed is 100r/min, and the mixing time is 3h; Water was added as a solvent. After the wet ball milling process is completed, vacuum drying is carried out to obtain a billet.

S104, vacuumize the bearing vacuum chamber;

S105, filling the blank with a volume of 1.35nV into the vacuum cavity of the bearing;

Where: V is the volume of the bearing to be manufactured, which can be calculated from the shape and size of the bearing to be manufactured. n is the number of bearings that can be produced for each filling, which can be configured according to production requirements.

S106. Applying a pressure of 65MPa and impacting and compacting the billet at a speed of 65m/s for 2 minutes, causing the billet to undergo plastic deformation to obtain a bearing;

S107, open the outlet of the vacuum chamber of the bearing, and drop the bearing into the finished product box.

Example 2

A method of manufacturing a ceramic bearing, the method comprising:

S201, preparing boron nitride powder and nano-copper powder with a particle size of 18 μm.

In this step, the boron nitride powder can be passed through an 800-mesh sieve several times to obtain a boron nitride powder with a particle size of 18 μm. Among them: nano-copper powder refers to copper particle powder with a particle size between 1 and 100 nm, which can be prepared by chemical vapor deposition, evaporation condensation, mechanical pulverization, and the like.

S202. Weigh 82.15% of boron nitride powder, 17.62% of nano-copper powder, and 0.23% of dispersant according to mass percentage.

Wherein: the dispersant can be: ferric ester coupling agent, lauric acid ester coupling agent, stearic acid, or oleic acid, which is not specifically limited in the present invention.

S203, uniformly mixing boron nitride powder, nano-copper powder and dispersant through ball milling to form a billet;

Optionally, the boron nitride powder and nano-copper powder can be vacuum-dried first, and a grinding ball with a ball-to-material mass ratio of 17:1 can be selected, wherein: the grinding ball can be made by pressureless sintering to silicon carbide. The mixing speed is 320r/min, and the mixing time is 18h. After the ball milling treatment, drying is carried out to obtain a billet.

S204, vacuumize the bearing vacuum chamber;

S205, filling the blank with a volume of 1.45nV into the vacuum cavity of the bearing;

Where: V is the volume of the bearing to be manufactured, which can be calculated from the shape and size of the bearing to be manufactured. n is the number of bearings that can be produced for each filling, which can be configured according to production requirements.

S206. Applying a pressure of 53MPa and impacting and compacting the billet at a speed of 58m/s for 1.2min, causing the billet to undergo plastic deformation to obtain a bearing;

S207. Open the outlet of the bearing vacuum chamber, and drop the bearing into the finished product box.

Example 3

A method of manufacturing a ceramic bearing, the method comprising:

S301. Prepare boron nitride powder with a particle size of 75 μm, alumina powder with a particle size of 75 μm, zirconia powder with a particle size of 75 μm, and nano copper powder.

In this step, boron nitride powder, alumina powder, and zirconia powder can be passed through a 200-mesh sieve several times to obtain boron nitride powder with a particle size of 75 μm, alumina powder with a particle size of 75 μm, and zirconia powder with a particle size of 75 μm. powder.

Among them: nano-copper powder refers to copper particle powder with a particle size between 1 and 100 nm, which can be prepared by chemical vapor deposition, evaporation condensation, mechanical pulverization, and the like.

S302. Weigh 50.00% of boron nitride powder, 16.00% of alumina powder, 17.22% of zirconia powder, 16.62% of nanometer copper powder, and 0.16% of dispersant according to mass percentage.

Wherein: the dispersant can be: ferric ester coupling agent, lauric acid ester coupling agent, stearic acid, or oleic acid, which is not specifically limited in the present invention.

S303, uniformly mixing boron nitride powder, alumina powder, zirconia powder, nano-copper powder and dispersant through ball milling to form a billet;

Optionally, a grinding ball with a mass ratio of ball to material of 19:1 is selected, wherein: the grinding ball can be made by pressureless sintering to silicon carbide. The mixing speed is 380r/min, and the mixing time is 23h. After the ball milling treatment, drying is carried out to obtain a billet.

S304, vacuumize the bearing vacuum chamber;

S305, filling the blank with a volume of 1.32nV into the vacuum chamber of the bearing;

Where: V is the volume of the bearing to be manufactured, which can be calculated from the shape and size of the bearing to be manufactured. n is the number of bearings that can be produced for each filling, which can be configured according to production requirements.

S306. Applying a pressure of 48MPa and impacting and compacting the billet at a speed of 47m/s for 1.8min, causing the billet to undergo plastic deformation to obtain a bearing;

S307. Open the outlet of the bearing vacuum chamber, and drop the bearing into the finished product box.

Example 4

A method of manufacturing a ceramic bearing, the method comprising:

S401. Prepare boron nitride powder with a particle size of 18 μm, silicon nitride powder with a particle size of 23 μm, and nanometer copper powder.

In this step, the boron nitride powder can be passed through an 800 mesh sieve several times to obtain a boron nitride powder with a particle size of 18 μm; the silicon nitride powder can be passed through a 600 mesh sieve several times to obtain a silicon nitride powder with a particle size of 23 μm.

Among them: nano-copper powder refers to copper particle powder with a particle size between 1 and 100 nm, which can be prepared by chemical vapor deposition, evaporation condensation, mechanical pulverization, and the like.

S402. Weigh 45.22% of boron nitride powder, 30.35% of silicon nitride powder, 24.22% of nanometer copper powder, and 0.21% of dispersant according to mass percentage.

Wherein: the dispersant can be: ferric ester coupling agent, lauric acid ester coupling agent, stearic acid, or oleic acid, which is not specifically limited in the present invention.

S403, uniformly mixing boron nitride powder, silicon carbide powder, nano-copper powder and dispersant through ball milling to form a billet;

Optionally, a grinding ball with a mass ratio of ball to material of 10:1 is selected, wherein: the grinding ball can be made by pressureless sintering to silicon carbide. The mixing speed is 250r/min, and the mixing time is 20h. After the ball milling treatment, drying is carried out to obtain a billet.

S404, vacuumize the bearing vacuum chamber;

S405, filling the blank with a volume of 1.22nV into the vacuum chamber of the bearing;

Where: V is the volume of the bearing to be manufactured, which can be calculated from the shape and size of the bearing to be manufactured. n is the number of bearings that can be produced for each filling, which can be configured according to production requirements.

S406. Applying a pressure of 55 MPa and impacting and compacting the billet at a speed of 65 m/s for 1 min, causing the billet to undergo plastic deformation to obtain a bearing;

S407, open the outlet of the vacuum chamber of the bearing, and drop the bearing into the finished product box.

Example 5

A method of manufacturing a ceramic bearing, the method comprising:

S501. Prepare boron nitride powder with a particle size of 90 μm, silicon nitride powder with a particle size of 80 μm, alumina powder with a particle size of 75 μm, and nano copper powder.

In this step, the boron nitride powder can be passed through a 170 mesh sieve several times to obtain a boron nitride powder with a particle size of 90 μm; the silicon nitride powder can be passed through a 180 mesh sieve several times to obtain a silicon nitride powder with a particle size of 80 μm; The alumina powder was passed through a 200-mesh sieve several times to obtain alumina powder with a particle size of 75 μm.

Among them: nano-copper powder refers to copper particle powder with a particle size between 1 and 100 nm, which can be prepared by chemical vapor deposition, evaporation condensation, mechanical pulverization, and the like.

S502. Weigh 38.45% of boron nitride powder, 20.32% of silicon nitride powder, 16.79% of aluminum oxide powder, 24.22% of nanometer copper powder, and 0.22% of dispersant according to mass percentage.

Wherein: the dispersant can be: ferric ester coupling agent, lauric acid ester coupling agent, stearic acid, or oleic acid, which is not specifically limited in the present invention.

S503, uniformly mixing boron nitride powder, silicon carbide powder, alumina powder, nano-copper powder and dispersant through ball milling to form a billet;

Optionally, a grinding ball with a mass ratio of ball to material of 15:1 is selected, wherein: the grinding ball can be made by pressureless sintering to silicon carbide. The mixing speed is 350r/min, and the mixing time is 22h. After the ball milling treatment, drying is carried out to obtain a billet.

S504, vacuumize the bearing vacuum chamber;

S505, filling the blank with a volume of 1.42nV into the vacuum cavity of the bearing;

Where: V is the volume of the bearing to be manufactured, which can be calculated from the shape and size of the bearing to be manufactured. n is the number of bearings that can be produced for each filling, which can be configured according to production requirements.

S506. Applying a pressure of 68MPa and impacting and compacting the billet at a speed of 68m/s for 1.5min, causing the billet to undergo plastic deformation to obtain a bearing;

S507. Open the outlet of the bearing vacuum chamber, and drop the bearing into the finished product box.

The rotational speed of the ceramic bearing manufactured by the invention can reach 9000-12000 r/min without generating noise, and meets the requirements of high rotational speed and quietness. Because the high rotating speed will make the temperature of the bearing relatively high, adding lubricant will burn the bearing, therefore, the ceramic bearing manufactured by the present invention does not need to add lubricant during use, prolonging the service life of the bearing.

The ceramic bearings manufactured in each embodiment are further tested for performance below; wherein:

Rotation speed: Install the manufactured ceramic bearing on the bench without adding lubricant, and test the rotation speed when the operating temperature of the bearing is constant;

Noise: According to the standard GB12348-2008, the environmental noise automatic detector is adopted;

Hardness: Vickers hardness tester, load 350gf, load time 15s;

Tensile strength: according to the standard GB-T 228.1-2010, measured on an electronic universal testing machine, the tensile rate is 1.5mm/min; radial crushing strength: according to the standard GB-T 6804-2008, on an electronic universal testing machine To measure, the compression rate is 1.2mm/min;

Friction coefficient: room temperature ball-disk contact rotation wear mode, load 6N, friction speed 2500rmp, friction radius 2.5mm, friction time 40min. The test results are shown in Table 1.

Table 1 performance test results of ceramic bearings of various embodiments

It can be seen from Table 1 that the rotational speed of the ceramic bearing manufactured by the present invention can reach 9000-12000r/min, and the noise during the rotation is lower than 30, which can be considered as quiet. No lubricating oil is needed during the whole use process, and it has high hardness, tensile strength and friction coefficient, excellent comprehensive performance and strong practicability.

It is to be understood that the invention is not limited to the specific structures and processes described above and shown in the drawings. For conciseness, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the sequence of steps after understanding the spirit of the present invention.

It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiment, or may be different from the order in the embodiment, or several steps may be performed simultaneously.

The above is only a specific implementation of the present invention, and those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described systems, modules and units can refer to the foregoing method embodiments The corresponding process in , will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present invention, and these modifications or replacements should cover all Within the protection scope of the present invention.

Claims (9)

1. A method of manufacturing a ceramic bearing, comprising:

uniformly mixing ceramic matrix powder and nanometer copper powder to form a blank;

the blank is impact formed at high speed in a vacuum environment.

2. The method of manufacturing a ceramic bearing according to claim 1, wherein the ceramic substrate is at least one selected from the group consisting of boron nitride, silicon nitride, aluminum oxide, silicon carbide, and zirconium oxide.

3. The method of manufacturing a ceramic bearing according to claim 2, wherein the ceramic base powder is boron nitride powder, and the mass percentage of the boron nitride powder is: 55-85% of nanometer copper powder by mass percent: 45-15%.

4. The method of manufacturing a ceramic bearing according to claim 2, wherein the ceramic base powder is a boron nitride powder and a silicon nitride powder, the boron nitride powder being in mass percent: 35-45% of silicon nitride powder by mass percent: 25-35% of nanometer copper powder by mass percent: 25-30%.

5. The method of manufacturing a ceramic bearing according to claim 2, wherein the ceramic base powder is a boron nitride powder, a silicon nitride powder, and an aluminum oxide powder, the boron nitride powder being in mass percent: 35-55% of silicon nitride powder by mass percent: 15-25% of aluminum oxide powder by mass percent: 10-18% of nanometer copper powder, which comprises the following components in percentage by mass: 15-20%.

6. The method according to any one of claims 3 to 5, wherein a dispersant is further added in an amount of 0.15 to 0.25% by mass before mixing.

7. The method of manufacturing a ceramic bearing according to claim 1, wherein the particle size of the ceramic base powder is 15 to 120 μm.

8. The method for manufacturing a ceramic bearing according to claim 1, wherein the ceramic base powder and the nano copper powder are uniformly mixed by wet ball milling treatment or ball milling treatment to form a blank; wherein:

the wet ball milling treatment comprises the following steps: the mass ratio of the ball material is 5-30: 1, the mixing rotating speed is 80-600 r/min, and the mixing time is 1-6 h; the solvent added in the wet ball milling treatment is water, alcohol or acetone;

the ball milling treatment is as follows: the mass ratio of the ball materials is 10-20: 1, the mixing rotating speed is 50-400 r/min, and the mixing time is 12-24 h.

9. The method of manufacturing a ceramic bearing according to claim 1, wherein the high-speed impact forming of the blank in a vacuum environment comprises:

vacuumizing the bearing vacuum cavity;

filling the blank into a bearing vacuum cavity;

applying 5-7 MPa pressure and impacting and compacting the blank at the speed of 50-70 m/s for 1-2 min to enable the blank to be plastically deformed to obtain the bearing;

and opening the outlet of the bearing vacuum cavity, and dropping the bearing into the finished product box.

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