CN112746276A - Valve plate preparation method and valve plate - Google Patents
Valve plate preparation method and valve plate Download PDFInfo
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- CN112746276A CN112746276A CN202011606305.9A CN202011606305A CN112746276A CN 112746276 A CN112746276 A CN 112746276A CN 202011606305 A CN202011606305 A CN 202011606305A CN 112746276 A CN112746276 A CN 112746276A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
- C23C24/045—Impact or kinetic deposition of particles by trembling using impacting inert media
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
- F04B1/18—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders having self-acting distribution members, i.e. actuated by working fluid
- F04B1/188—Plate-like distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2042—Valves
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention relates to the technical field of preparation of high-pressure plunger pumps, and discloses a preparation method of a valve plate and the valve plate. The preparation method of the valve plate comprises the following steps: s1, treating the surface of the base body of the valve plate; s2, preparing a composite coating by cold spraying; s3, heat treatment of the coating; and S4, coating and post-treating. According to the technical scheme, the composite coating with the self-lubricating and anti-wear characteristics is designed on the base body of the valve plate, and then the self-lubricating and anti-wear coating is formed on the surface of the base body by adopting a cold spraying process. By the formula of the self-lubricating antifriction coating, the dual effects of micro-area in-situ forging and solid phase diffusion can be realized, the binding force and the compactness of the coating are effectively improved, and the wear resistance of the friction surface of the flow distribution pair is improved; the cold spraying process has the advantages that the formula of the composite coating can be designed in a cutting mode, the requirements of different working conditions are met, the long-acting service life is prolonged, meanwhile, the cold spraying technology is flexible in process, controllable in thickness and few in operation procedures, and the production cost can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of preparation of high-pressure plunger pumps, in particular to a preparation method of a valve plate and the valve plate.
Background
The plunger pump is the most used hydraulic pump in the current hydraulic system, and the friction pair of the plunger pump needs to bear higher load due to the high working pressure, so the abrasion of the friction pair is increased. The existing research on the friction and wear characteristics of a flow distribution pair of an axial plunger pump is mainly carried out under the working condition of medium and low rotating speed (less than or equal to 1200r/min), and the friction and wear characteristics are far less than the rated rotating speed of the axial plunger pump.
The existing production of the valve plate mainly comprises three methods: firstly, the whole brass is adopted for manufacturing, and secondly, the nitriding treatment is carried out after the tempering of low alloy steel such as 38CrMoAl, 42CrMo and the like to improve the wear resistance, the valve plate is easy to generate adhesive wear and abrasive wear under the working condition of high rotating speed and high stress, and the phenomena of cylinder burning and even seizure are generated, so that the parts are caused to fail early; thirdly, the steel/copper bimetallic valve plate is prepared by adopting a copper melting mode, although the structure can improve the wear resistance of the friction pair to a certain extent, the structure has larger problems in the copper melting process and the control of the microstructure, and simultaneously, the cost of vacuum diffusion treatment is also high, and the structure is only used in a small part of models at present.
Through a large number of practical findings: wear failure of critical friction pairs is an important factor affecting plunger pump life. For an axial plunger pump, three key friction pairs, namely a sliding shoe pair, a plunger pair and a flow distribution pair, have direct influence on the performance and the service life of the pump. The wear of the friction pair can cause the clearance of the friction surface to be enlarged, increase the leakage inside the plunger pump, reduce the volume efficiency of elements, increase the heat generation of a system and finally cause the damage of the plunger pump. The flow distribution pair is a friction pair with the largest structure in the axial plunger pump, and the flow field and the stress condition in the kinematic pair are complex. The distribution pair is also most susceptible to wear failure. The flow distribution pair is the largest friction pair of a single structure in the plunger pump, and has the function of supporting the cylinder body to maintain the stress balance of the cylinder body while meeting the flow distribution function. In such a severe working environment, the distribution pair is easy to wear and even burn. Therefore, the plunger pump flow distribution pair requires a material having low abrasion under a high contact pressure, a long life, good thermal conductivity, high toughness and good impact resistance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method of a valve plate and the valve plate.
In order to achieve the above object, the present invention provides a port plate manufacturing method, comprising the steps of:
s1 surface treatment of valve plate base body
Carrying out oil removal, rust removal and purification treatment on the surface of the matrix of the valve plate by adopting ultrasonic cleaning, and roughening the matrix by sand blasting;
s2, preparing the composite coating by cold spraying
Forming a self-lubricating antifriction coating on the surface of the substrate by adopting a cold spraying process; wherein the self-lubricating antifriction coating comprises a base component, a solid lubricant, and a friction additive;
s3, heat treatment of coating
Carrying out heat treatment on the cold spraying coating sample by using a vacuum sintering furnace, wherein the annealing temperature range of the sample is 300-900 ℃; the heat treatment method adopts argon as protective atmosphere, and the heating rate is 5 ℃ for min-1To 10 ℃ for min-1After the temperature is raised to the specified temperature, keeping the temperature for 1 to 6 hours, and then cooling along with the furnace;
s4, post-treatment of coating
And when the dimensional accuracy and the surface roughness after spraying or heat treatment can not meet the requirements, carrying out mechanical processing on the workpiece.
According to the technical scheme, the composite coating with the self-lubricating and anti-wear characteristics is designed on the base body of the valve plate, and then the self-lubricating and anti-wear coating is formed on the surface of the base body by adopting a cold spraying process. By the formula of the self-lubricating antifriction coating, the dual effects of micro-area in-situ forging and solid phase diffusion can be realized, the binding force and the compactness of the coating are effectively improved, and the wear resistance of the friction surface of the flow distribution pair is improved; the cold spraying process has the advantages that the formula of the composite coating can be designed in a cutting mode, the requirements of different working conditions are met, the long-acting service life is prolonged, meanwhile, the cold spraying technology is flexible in process, controllable in thickness and few in operation procedures, and the production cost can be greatly reduced.
Further, in S1, the sand material for sand blasting is any one of quartz sand, alumina sand, and chilled iron sand;
in the sand blasting process, the included angle between the operation direction of the sand blasting gun and the surface of the matrix is 70-80 degrees, and the sand blasting grade reaches Sa2.5 grade of GB8923 so as to thoroughly remove impurities on the surface of the matrix, so that the sand material layer after sand blasting presents the same metal true color as the matrix.
Further, the base component comprises any one of copper, tin, zinc and aluminum and any one of iron, nickel, zirconium, antimony, titanium, molybdenum and tungsten as alloy elements to strengthen the base;
the solid lubricant is a low-melting-point metal or nonmetal;
the friction additive is a hard particulate phase.
Further, the low-melting-point metal is any one of copper, tin, zinc and aluminum;
the nonmetal is graphite and MoS2、WS2Any one of PbO and ZnO;
the hard particle phase is Al2O3、ZrO2Any one of SiC and WC.
Further, in S2, the thickness of the composite coating layer requires multiple spraying, the adjacent spraying areas overlap by 1/4 width, and the total thickness of the coating layer can be controlled in the range of 0.1mm to 5 mm.
Further, in S2, the cold spray process needs to select a proper carrier gas temperature at 300 ℃ to 800 ℃ and a carrier gas pressure at 0.6MPa to 3.5MPa according to different spray materials.
Further, the carrier gas is helium, nitrogen or air.
Further, in S3, the heat treatment is performed by determining the annealing or solid phase diffusion temperature according to the material of the substrate and the composition formula of the self-lubricating wear-reducing coating.
Further, in S4, the machining is turning or grinding.
In a second aspect, the invention provides a port plate obtained by the port plate manufacturing method.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a schematic structural view of one embodiment of the port plate of the present invention.
FIG. 2 is a cross-sectional view of one embodiment of the port plate of the present invention.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of the terms of orientation such as "upper and lower" in the case where no description is made to the contrary generally means the orientation in the assembled and used state. "inner and outer" refer to the inner and outer contours of the respective component itself.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a preparation method of a valve plate, which comprises the following steps:
s1 surface treatment of valve plate base body
Carrying out oil removal, rust removal and purification treatment on the surface of the matrix of the valve plate by adopting ultrasonic cleaning, and roughening the matrix by sand blasting;
s2, preparing the composite coating by cold spraying
Forming a self-lubricating antifriction coating on the surface of the substrate by adopting a cold spraying process; wherein the self-lubricating antifriction coating comprises a base component, a solid lubricant, and a friction additive;
s3, heat treatment of coating
Carrying out heat treatment on the cold spraying coating sample by using a vacuum sintering furnace, wherein the annealing temperature range of the sample is 300-900 ℃; the heat treatment method adopts argon as protective atmosphere, and the heating rate is 5 ℃ for min-1To 10 ℃ for min-1After the temperature is raised to the specified temperature, keeping the temperature for 1 to 6 hours, and then cooling along with the furnace;
s4, post-treatment of coating
And when the dimensional accuracy and the surface roughness after spraying or heat treatment can not meet the requirements, carrying out mechanical processing on the workpiece.
According to the technical scheme, the composite coating with the self-lubricating and anti-wear characteristics is designed on the base body of the valve plate, and then the self-lubricating and anti-wear coating is formed on the surface of the base body by adopting a cold spraying process. By the formula of the self-lubricating antifriction coating, the dual effects of micro-area in-situ forging and solid phase diffusion can be realized, the binding force and the compactness of the coating are effectively improved, and the wear resistance of the friction surface of the flow distribution pair is improved; the cold spraying process has the advantages that the formula of the composite coating can be designed in a cutting mode, the requirements of different working conditions are met, the long-acting service life is prolonged, meanwhile, the cold spraying technology is flexible in process, controllable in thickness and few in operation procedures, and the production cost can be greatly reduced.
In a preferred embodiment, the base body of the port plate is a steel base body.
In S1, the sand material for sand blasting may be any one of quartz sand, alumina sand, and chilled iron sand. In the sand blasting process, the included angle between the operation direction of the sand blasting gun and the surface of the matrix is 70-80 degrees, and the sand blasting grade reaches Sa2.5 grade of GB8923 so as to thoroughly remove oil stains, oxide skins, rust, impurities and the like on the surface of the workpiece, so that the sand material layer after sand blasting presents the same metal true color as the matrix.
The matrix component can be any one of copper, tin, zinc and aluminum and any one of iron, nickel, zirconium, antimony, titanium, molybdenum and tungsten to be used as an alloy element for strengthening the matrix; in another alternative embodiment, the base component is copper-based.
The solid lubricant is a low melting point metal or nonmetal. The low-melting-point metal can be any one of copper, tin, zinc and aluminum; the nonmetal can be selected from graphite and MoS2、WS2PbO, and ZnO. The friction additive is hard particle phase, and the hard particle phase can be Al2O3、ZrO2Any one of SiC and WC. The friction additive can adjust the mechanical property of the matrix on one hand, and realize the in-situ micro-forging effect on the other hand, thereby improving the density and the service performance of the coating.
In S2, the thickness of the composite coating layer needs to be sprayed multiple times, so that adjacent sprayed areas overlap 1/4 width, and the total thickness of the coating layer can be controlled within the range of 0.1mm to 5 mm. In addition, the cold spraying process needs to select proper carrier gas temperature at 300-800 ℃ and carrier gas pressure at 0.6-3.5 MPa according to different spraying materials. Wherein, the carrier gas can be helium, nitrogen or air.
In S3, the heat treatment determines the annealing or solid phase diffusion temperature according to the material of the substrate and the composition formula of the self-lubricating antifriction coating, so as to regulate and control the microstructure of the antifriction layer, and the quality of the coating is characterized by the PV value, the friction coefficient and the unit wear rate of the friction wear test.
In S4, the machining is turning or grinding.
In a second aspect, the present invention provides a port plate comprising a substrate 10 and a composite coating 20 formed on a surface of the substrate. The composite coating 20 is made by the above method.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A preparation method of a port plate is characterized by comprising the following steps:
s1 surface treatment of valve plate base body
Carrying out oil removal, rust removal and purification treatment on the surface of the matrix of the valve plate by adopting ultrasonic cleaning, and roughening the matrix by sand blasting;
s2, preparing the composite coating by cold spraying
Forming a self-lubricating antifriction coating on the surface of the substrate by adopting a cold spraying process; wherein the self-lubricating antifriction coating comprises a base component, a solid lubricant, and a friction additive;
s3, heat treatment of coating
Carrying out heat treatment on the cold spraying coating sample by using a vacuum sintering furnace, wherein the annealing temperature range of the sample is 300-900 ℃; the heat treatment method adopts argon as protective atmosphere, and the heating rate is 5 ℃ for min-1To 10 ℃ for min-1Increasing to a specified temperatureAfter the temperature is reduced, keeping the temperature for 1 to 6 hours, and then cooling along with the furnace;
s4, post-treatment of coating
And when the dimensional accuracy and the surface roughness after spraying or heat treatment can not meet the requirements, carrying out mechanical processing on the workpiece.
2. The method for preparing a valve plate according to claim 1, wherein in S1, the sand material for sand blasting is any one of quartz sand, alumina sand and chilled iron sand;
in the sand blasting process, the included angle between the operation direction of the sand blasting gun and the surface of the matrix is 70-80 degrees, and the sand blasting grade reaches Sa2.5 grade of GB8923 so as to thoroughly remove impurities on the surface of the matrix, so that the sand material layer after sand blasting presents the same metal true color as the matrix.
3. The port plate manufacturing method according to claim 1, characterized in that:
the matrix component comprises any one of copper, tin, zinc and aluminum and any one of iron, nickel, zirconium, antimony, titanium, molybdenum and tungsten which are taken as alloy elements to reinforce the matrix;
the solid lubricant is a low-melting-point metal or nonmetal;
the friction additive is a hard particulate phase.
4. A method for preparing a port plate according to claim 3, characterized in that:
the low-melting-point metal is any one of copper, tin, zinc and aluminum;
the nonmetal is graphite and MoS2、WS2Any one of PbO and ZnO;
the hard particle phase is Al2O3、ZrO2Any one of SiC and WC.
5. The method of claim 1, wherein in S2, the thickness of the composite coating layer requires multiple spraying, the adjacent spraying areas overlap by 1/4 width, and the total thickness of the coating layer can be controlled within the range of 0.1mm to 5 mm.
6. The port plate manufacturing method according to claim 1, characterized in that: in S2, the cold spraying process needs to select proper carrier gas temperature at 300-800 deg.C and carrier gas pressure at 0.6-3.5 MPa according to different spraying materials.
7. The port plate manufacturing method according to claim 6, wherein the carrier gas is helium, nitrogen or air.
8. The method for preparing a port plate according to claim 1, wherein in S3, the heat treatment is carried out by determining an annealing or solid phase diffusion temperature according to the composition formula of the material of the substrate and the self-lubricating wear-reducing coating.
9. The port plate manufacturing method according to claim 1, characterized in that: in S4, the machining is turning or grinding.
10. Port plate, characterized in that it is obtained by the port plate manufacturing method according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011606305.9A CN112746276A (en) | 2020-12-30 | 2020-12-30 | Valve plate preparation method and valve plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011606305.9A CN112746276A (en) | 2020-12-30 | 2020-12-30 | Valve plate preparation method and valve plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464511A (en) * | 2021-06-30 | 2021-10-01 | 北京航空航天大学宁波创新研究院 | Bimetal oil separating cover |
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| CN108486565A (en) * | 2018-03-27 | 2018-09-04 | 中国科学院兰州化学物理研究所 | A kind of low pressure cold spraying copper radical self-lubricating coating and preparation method thereof |
| CN109825828A (en) * | 2019-04-04 | 2019-05-31 | 林庆仁 | A kind of vacuum pump screw rotor tungsten carbide-copper-nickel composite coat preparation method |
| CN110607526A (en) * | 2019-09-06 | 2019-12-24 | 中国兵器科学研究院宁波分院 | Method for preparing nickel-based wide-temperature-range self-lubricating coating with nano structure by cold spraying |
| CN110894603A (en) * | 2019-12-26 | 2020-03-20 | 西安建筑科技大学 | Material for preparing wear-resistant self-lubricating coating, wear-resistant self-lubricating coating and preparation method |
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