CN111394719A - M50 base bearing self-lubricating material and preparation method thereof - Google Patents
M50 base bearing self-lubricating material and preparation method thereof Download PDFInfo
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
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Abstract
The invention relates to an M50 base bearing self-lubricating material and a preparation method thereof, which mainly takes an aviation main shaft bearing material M50steel as a base material, takes Sn-Ag-Cu as a lubricating phase and takes Carbon Nano Tubes (CNTs) as a reinforcing phase; the surface of the M50steel is provided with array micropores, and Sn-Ag-Cu/CNTs are filled in the surface micropores to realize the lubricating function. The invention adopts ultra-precise electric spark micropore electromachining technology to prepare the surface micropores of the M50 steel; secondly, preparing Sn-Ag-Cu spherical powder containing CNTs by using a vacuum atomization method; and finally, directly infiltrating and forming Sn-Ag-Cu/CNTs spherical powder into micropores on the surface of M50steel by using a high-temperature high-pressure infiltration technology to obtain the M50 base bearing self-lubricating material. The M50-based bearing self-lubricating material has excellent friction and wear resistance, can effectively improve the tribological performance of the M50steel material, and has the advantages of simple preparation method and easily-controlled preparation process.
Description
Technical Field
The invention relates to an M50 base bearing self-lubricating material and a preparation method thereof, belonging to the field of solid self-lubricating composite materials.
Background
The M50 high-temperature bearing steel has a plurality of excellent characteristics such as high-temperature dimensional stability, high-temperature hardness, high-temperature contact fatigue performance and the like, and is a main steel for main shaft bearings of aeroengines in various countries worldwide. At present, the aero-engine takes high thrust-weight ratio as a main development direction, so that the operation condition of the aero-bearing tends to be higher speed and heavy load. The problem of friction and wear of the main shaft bearing of the aircraft engine under high-temperature conditions is more serious, and therefore, how to develop the M50 aircraft main shaft bearing with excellent friction and wear resistance has important engineering value.
The solid self-lubricating technology is the most common and effective means for solving the problem of friction and wear of metal materials. Yang et al prepared TiAl-Ag self-lubricating composite material by spark plasma sintering technology and carried out abrasion wear test, characterized the frictional wear behavior by analysis and test technology, and the results showed that the reason why the TiAl-Ag self-lubricating composite material has excellent tribological properties at 450 ℃ is mainly attributed to the formation of a layer of lubricating film rich in soft metal solid lubricant silver on the wear surface during the friction process ([ 1)]Yang K,Shi XL,Huang YC,Zhai WZ,Wang YF,Zhang A,Zhang QX.Theresearch on the sliding friction andwearbehaviors ofTiAl-10wt.％Ag atelevatedtemperatures[J]Material Chemistry and Physics,2017,186: 317-326). Cheng et al have studied the antifriction and wear-resistant properties of the nickel-based self-lubricating composite material containing the soft metallic lubricant silver at high temperature, and the analysis result shows that the friction coefficient of the nickel-based composite material is as low as 0.2, and the oxidation behavior of the friction surface and the enrichment, film-forming and lubricating behavior of the soft metallic lubricant silver are the main reasons for the excellent tribological properties of the nickel-based composite material([2]Cheng J,Zhen JM,Zhu SY,Yang J,Ma JQ,Li WS,Liu WM.Friction and wear behavior of Ni-based solid-lubricating composites at high temperature in a vacuum environment[J].Materials&Design,2017,122: 405-413). Essa et al studied WS2And ZnO as the lubricating phase, and research results show that WS2And ZnO can ensure that the M50steel has good antifriction and wear resistance performance in a wide temperature range ([3 ]]Essa FA,Zhang QX,Huang XJ,Investigation of the effects ofmixtures of WS2and ZnO solid lubricants on the sliding friction and wetted metals of M50steel aggregate silicon nitride at least one temperature, Wear 374-375 (2017) 128-141.). L iu and the like, studied at high temperature stage with MoS2Tribological behaviour of the M50-based self-lubricating material as the lubricating phase, the results show that MoS was added2The FeS and the newly generated FeS play roles of reducing friction and resisting wear in the friction process, so that the M50 self-lubricating material keeps a low friction coefficient and wear rate ([4 ]]Liu XY,Shi XL,Wu CH,Yang K,Huang YC,Deng XB,Yan Z,Xue B.Tribological behavior of M50-MoS2Self-lubricating composites from 150to 450℃[J].Materials Chemistry&Physics,2017,198: 145-153.). However, the materials used in the above researches are prepared by mechanically mixing and sintering the base material and the lubricant by a powder metallurgy technology, and have the contradiction that the self-lubricating property and the mechanical property of the self-lubricating material are difficult to be adjusted, and the tribological property of the prepared self-lubricating material is difficult to be adjusted and controlled due to the randomness and the complexity of friction.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the M50-based bearing self-lubricating material and the preparation method thereof aiming at the defects in the prior art, the material has excellent antifriction and wear-resistant characteristics, the preparation method is simple and feasible, and a good practical basis is provided for the engineering application of the M50-based self-lubricating material.
The technical scheme adopted by the invention for solving the problems is as follows:
an M50-based bearing self-lubricating material mainly takes an aviation main shaft bearing material M50steel as a base material, takes Sn-Ag-Cu alloy as a lubricating phase and takes Carbon Nanotubes (CNTs) as a reinforcing phase; the surface micropores are formed by the arrangement of a lubricating phase/an enhanced phase, and the surface micropore structure is taken as a lubricating phase to realize the lubricating structural form.
According to the scheme, the surface micropores are a plurality of straight pores and are arranged in an array mode.
According to the scheme, the structural parameters of the surface micropores are as follows: the diameter range of each surface micropore is 200-300 mu m, the depth of each micropore is 800-1000 mu m, and the distance between every two adjacent micropores is equal and is 700-1000 mu m.
According to the scheme, the mass ratio of the lubricating phase Sn-Ag-Cu alloy to the reinforcing phase Carbon Nanotubes (CNTs) is (80-105): (1-2); in the lubricating phase Sn-Ag-Cu alloy, the mass ratio of Sn, Ag and Cu is (45-55): (30-40): (5-10).
The M50-based bearing self-lubricating material is characterized in that a surface micropore structure is processed on the surface of an M50 bearing steel material by an electric spark micropore processing technology; then, preparing Sn-Ag-Cu spherical powder (namely Sn-Ag-Cu/CNTs spherical powder) containing CNTs by using a vacuum atomization method; and then, fusing and infiltrating Sn-Ag-Cu/CNTs spherical powder into surface micropores of the M50steel by adopting a high-temperature high-pressure infiltration technology to obtain the M50 base bearing self-lubricating material.
According to the scheme, the technological parameters of the electric spark micropore machining are as follows: the pulse width is 600-900 nS, the range between pulses is 400-700 nS, and the peak current range is 0.1-1A.
According to the scheme, the parameters of the high-temperature high-pressure infiltration process are as follows: the infiltration temperature is 500-650 ℃, the heating power is 60-70 kW, the vacuum degree is 0.80-0.93 Pa, the pressure is provided by argon, and the pressure change is 0.72-0.82 Mp.
According to the scheme, the preparation method of the Sn-Ag-Cu/CNTs spherical powder comprises the following steps:
(1) weighing simple substance powder of the Sn-Ag-Cu alloy as a first raw material according to the composition elements and the content of the composition elements; weighing a certain amount of CNTs powder as a second raw material; mixing the first raw material and the second raw material to obtain an initial ingredient;
(2) melting the initial ingredients obtained in the step (1) in vacuum or inert atmosphere to obtain a molten liquid;
(3) and atomizing the melt, cooling and solidifying the melt drops obtained by atomization to form spherical powder, namely Sn-Ag-Cu/CNTs spherical powder.
Further, in the step (1), the elementary substance powder of each component element in the Sn-Ag-Cu alloy is Sn powder, Ag powder and Cu powder, and the particle size of the powder is 20-35 μm; sn powder, Ag powder, Cu powder and CNTs powder, wherein the specific gravity is as follows: (45-55): (30-40): (5-10): (1-2).
Further, vibration mixing is adopted in the step (1), the vibration frequency is 40-50 Hz, the vibration force is 10500-11500N, and the oscillation time is 20-30 min.
Further, in the step (2), the melting temperature is 400-500 ℃; screening the obtained Sn-Ag-Cu/CNTs spherical powder in the step (3), wherein the particle size is preferably controlled within the range of 30-40 mu m; the technological conditions of melting and atomization are as follows: vacuumizing in advance, wherein the vacuum degree is less than 0.06MPa, and the oxygen content is less than 100 ppm.
The M50-based bearing self-lubricating material prepared by the method shows excellent high-temperature tribological performance in the process of friction and wear.
Compared with the prior art, the invention has the beneficial effects that:
1. the M50-based bearing self-lubricating material is formed in M50 surface micropores through Sn-Ag-Cu/CNTs, so that on one hand, the defect that the mechanical strength of a self-lubricating composite material is small due to the fact that a base material and a lubricating camera are mixed and prepared by a traditional solid self-lubricating material is overcome, on the other hand, the surface micropore structure can be designed artificially, and therefore the friction lubricating behavior can be regulated in a controllable mode to a certain degree.
2. In the invention, Sn-Ag-Cu/CNTs formed in surface micropores can be precipitated to a wear surface at high temperature, the Sn-Ag-Cu has good lubricating effect, and the CNTs can enhance the strength of a surface lubricating layer due to the unique structure, thereby improving the bearing capacity and wear resistance of the self-lubricating material.
3. In the invention, Sn-Ag-Cu/CNTs are mixed to prepare spherical powder instead of mechanical mixing, which is beneficial to the more uniform distribution of all the components of a lubricating phase and a reinforcing phase and the improvement of the stability of the lubricating behavior of the self-lubricating material.
4. The invention adopts the electric spark micropore processing technology to prepare the surface micropore structure, and adopts the high-temperature high-pressure infiltration technology to form Sn-Ag-Cu/CNTs in micropores, the preparation method is simple, convenient and novel, the operability is strong, the process parameters are easy to control, the M50 material is cheap, the industrial popularization value is very strong, and the industrial development requirement is met.
Drawings
FIG. 1 is a flow chart of the manufacturing process of the present invention.
FIG. 2 is a SEM image of Sn-Ag-Cu/CNTs spherical powder prepared in example 1 of the present invention.
Fig. 3 is a microscopic view of the self-lubricating material of the M50-based bearing prepared in example 1 of the present invention.
FIG. 4 is a friction coefficient curve of the self-lubricating material of the M50 base bearing prepared in the embodiments 1, 2 and 3 of the present invention, and the friction test conditions are as follows: the temperature is 350 ℃, the load is 12N, and the sliding speed is 0.2 m/s.
FIG. 5 is a wear rate curve of the self-lubricating material of the M50-based bearing prepared in the embodiments 1, 2 and 3 of the present invention, and the friction test conditions are as follows: the temperature is 350 ℃, the load is 12N, and the sliding speed is 0.2 m/s.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, but the present invention is not limited to the following examples.
In the following embodiments, the M50-based bearing self-lubricating material is prepared by using M50steel as a base material, Sn-Ag-Cu as a lubricating phase and Carbon Nanotubes (CNTs) as an enhanced phase, processing micropores arranged in an array manner on the surface of M50 bearing steel material by using an electric spark micropore processing technology, preparing Sn-Ag-Cu spherical powder containing CNTs by using a vacuum atomization method, and filling the Sn-Ag-Cu/CNTs spherical powder in the micropores on the surface by using a high-temperature high-pressure infiltration technology to obtain the M50-based bearing self-lubricating material. The invention provides a specific preparation method, but the preparation method is not limited, and Sn-Ag-Cu/CNTs spherical powder, a surface microporous structure and an M50 base bearing self-lubricating material which are prepared by other methods and meet the requirements of the invention also belong to the protection scope of the invention.
The invention provides a preparation method of an M50 base bearing self-lubricating material, which comprises the following steps:
1) according to the parameters of the surface micropore structure, taking an M50 bearing steel material as an object, and carrying out micropore processing on the surface of an M50 material by utilizing an electric spark micropore processing technology, wherein the diameter range of each surface micropore is 200-300 mu M, the depth of each surface micropore is 800-1000 mu M, and the distances between every two adjacent micropores are equal and are all within 700-1000 mu M; wherein, the electric spark micropore machining process parameters are as follows: the pulse width is 600-900 nS, the range between pulses is 400-700 nS, and the peak current range is 0.1-1A.
2) Weighing simple substance powder of the components according to the components and the contents of the components of the lubricating phase and the reinforcing phase, and taking the simple substance powder as a raw material; the simple substance powder of each component element is Sn powder, Ag powder, Cu powder and CNTs powder, and the specific gravity is as follows: (45-55): (30-40): (5-10): (1-2);
3) mixing raw material powder such as Sn powder, Ag powder, Cu powder and CNTs powder, and then placing the mixture into a vibration mixer, wherein the vibration frequency is 40-50 Hz, the vibration force is 10500-11500N, and the vibration time is 20-30 minutes, so as to obtain an initial ingredient; vacuumizing the smelting chamber and the atomizing chamber, adding initial ingredients into a smelting crucible, heating the crucible to 400-500 ℃, and melting the initial ingredients to obtain molten liquid; then, an atomizing nozzle sprays argon, the melt is atomized, the atomized powder enters a collecting tank, and after the powder is cooled, the powder is dried, collected and sieved to obtain Sn-Ag-Cu/CNTs spherical powder; wherein, the smelting chamber and the atomizing chamber are pre-vacuumized, the predetermined vacuum degree is less than 0.06MPa, and the predetermined oxygen content is less than 100 ppm;
4) and (2) melting and infiltrating the Sn-Ag-Cu/CNTs spherical powder into micropores on the surface of the M50 matrix material at high temperature and high pressure, wherein the infiltration process parameters are as follows: and (3) carrying out infiltration at the temperature of 500-650 ℃, heating power of 60-70 kW, vacuum degree of 0.80-0.93 Pa, pressure provided by argon, and pressure change of 0.72-0.82 Mp to obtain the M50 base bearing self-lubricating material.
Example 1
As shown in figure 1, the preparation method of the M50 base bearing self-lubricating material is characterized in that electric spark micropore processing technology is adopted to process micropores arranged in an array mode on the surface of M50 bearing steel material, then, a vacuum atomization method is utilized to prepare Sn-Ag-Cu/CNTs spherical powder, and then, high-temperature and high-pressure infiltration technology is utilized to fill the Sn-Ag-Cu/CNTs spherical powder into the micropores on the surface, so that the M50 base bearing self-lubricating material is obtained. The method comprises the following specific steps:
1) selecting an M50 bearing steel material, and carrying out micropore machining on the surface of M50 by adopting an electric spark micropore machining technology, wherein the diameter of each micropore is 200 mu M, the depth of each micropore is 800 mu M, and the distance between every two adjacent micropores is equal and is 700 mu M;
the technological parameters of the electric spark micropore machining are the pulse width of 600nS and the range between pulses of 400 nS;
2) selecting Sn, Ag, Cu and CNTs powder according to the mass ratio of 50: 40: 9: 1, mixing and placing the mixture in a vibration mixer, wherein the vibration frequency is 40Hz, the vibration force is 10500N, and the oscillation time is 20 minutes to obtain initial ingredients;
3) vacuumizing the smelting chamber and the atomizing chamber to vacuum degree of less than 0.06MPa and oxygen content of less than 100 ppm; adding the initial ingredients into a melting crucible, heating the crucible to 400 ℃, and melting the added initial ingredients into a melt; then, an atomizing nozzle is opened, the sprayed gas is argon, and the melt is atomized; the atomized powder enters a collecting tank, and after the powder is cooled, the powder is dried, collected and sieved to obtain Sn-Ag-Cu/CNTs spherical powder (shown in figure 2);
4) and (2) melting and infiltrating the Sn-Ag-Cu/CNTs spherical powder into micropores on the surface of the M50 matrix material at high temperature and high pressure, and setting the parameters of the high-temperature and high-pressure infiltration process: the infiltration temperature is 650 ℃, the heating power is 70kW, the vacuum degree is 0.93Pa, the argon provides pressure, and the pressure changes by 0.72-0.82 Mp; the procedure was set to obtain an M50 base bearing self-lubricating material (shown in fig. 3).
FIGS. 4(a) and 5(a) are the average coefficient of friction (about 0.20) and wear rate (about 6.32 × 10), respectively, for the inventive examples-7mm3N-1m-1) The average friction coefficient and the wear rate are small, and excellent tribological performance is shown.
Example 2
A preparation method of an M50 base bearing self-lubricating material is characterized in that electric spark micropore processing technology is adopted to process micropores arranged in an array mode on the surface of M50 bearing steel material, then, a vacuum atomization method is utilized to prepare Sn-Ag-Cu/CNTs spherical powder, and then high-temperature high-pressure infiltration technology is utilized to fill the Sn-Ag-Cu/CNTs spherical powder into the micropores on the surface, so that the M50 base bearing self-lubricating material is obtained. The method comprises the following specific steps:
1) selecting an M50 bearing steel material, and carrying out micropore machining on the surface of M50 by adopting an electric spark micropore machining technology, wherein the diameter of each micropore is 250 micrometers, the depth of each micropore is 900 micrometers, and the distance between every two adjacent micropores is 850 micrometers;
the technological parameters of the electric spark micropore machining are the pulse width 750nS and the interpulse range 550 nS;
2) selecting Sn, Ag, Cu and CNTs powder according to the mass ratio of 55: 38: 6: 1. mixing, placing in a vibration mixer, wherein the vibration frequency is 40Hz, the vibration force is 10500N, and the oscillation time is 20 minutes to obtain an initial ingredient;
3) vacuumizing the smelting chamber and the atomizing chamber to vacuum degree of less than 0.06MPa and oxygen content of less than 100 ppm; adding the initial ingredients into a melting crucible, heating the crucible to 450 ℃, and melting the added initial ingredients into a melt; then, an atomizing nozzle is opened, the sprayed gas is argon, and the melt is atomized; the atomized powder enters a collecting tank, and after the powder is cooled, the powder is dried, collected and sieved to obtain Sn-Ag-Cu/CNTs spherical powder;
4) and (2) melting and infiltrating the Sn-Ag-Cu/CNTs spherical powder into micropores on the surface of the M50 matrix material at high temperature and high pressure, and setting the parameters of the high-temperature and high-pressure infiltration process: and (3) carrying out infiltration at the temperature of 600 ℃, heating power of 60kW, vacuum degree of 0.88Pa, pressure provided by argon, and pressure change of 0.72-0.82 Mp to obtain the M50-based bearing self-lubricating material.
FIGS. 4(b) and 5(b) are the average coefficient of friction (about 0.18) and the wear rate (about 5.81 × 10), respectively, for the examples of the present invention-7mm3N-1m-1) The average friction coefficient and the wear rate are small, and excellent tribological performance is shown.
Example 3
A preparation method of an M50 base bearing self-lubricating material is characterized in that electric spark micropore processing technology is adopted to process micropores arranged in an array mode on the surface of M50 bearing steel material, then, a vacuum atomization method is utilized to prepare Sn-Ag-Cu/CNTs spherical powder, and then high-temperature high-pressure infiltration technology is utilized to fill the Sn-Ag-Cu/CNTs spherical powder into the micropores on the surface, so that the M50 base bearing self-lubricating material is obtained. The method comprises the following specific steps:
1) selecting an M50 bearing steel material, and carrying out micropore machining on the surface of M50 by adopting an electric spark micropore machining technology, wherein the diameter of each micropore is 300 mu M, the depth of each micropore is 1000 mu M, and the distance between every two adjacent micropores is equal to 1000 mu M; the technological parameters of the electric spark micropore machining are the pulse width of 900nS and the range between pulses of 700 nS;
2) selecting Sn, Ag, Cu and CNTs powder according to the mass ratio of 52: 40: 7: 2. mixing, placing in a vibration mixer, wherein the vibration frequency is 40Hz, the vibration force is 10500N, and the oscillation time is 20 minutes to obtain an initial ingredient;
3) vacuumizing the smelting chamber and the atomizing chamber to vacuum degree of less than 0.06MPa and oxygen content of less than 100 ppm; adding the initial ingredients into a melting crucible, heating the crucible to 500 ℃, and melting the added initial ingredients into a melt; then, an atomizing nozzle is opened, the sprayed gas is argon, and the melt is atomized; the atomized powder enters a collecting tank, and after the powder is cooled, the powder is dried, collected and sieved to obtain Sn-Ag-Cu/CNTs spherical powder;
4) and (2) melting and infiltrating the Sn-Ag-Cu/CNTs spherical powder into micropores on the surface of the M50 matrix material at high temperature and high pressure, and setting the parameters of the high-temperature and high-pressure infiltration process: and (3) carrying out infiltration at 650 ℃, heating power of 60kW, vacuum degree of 0.88Pa, argon gas for providing pressure, and pressure change of 0.72-0.82 Mp to obtain the M50-based bearing self-lubricating material.
FIGS. 4(c) and 5(c) are the average coefficient of friction (about 0.21) and the wear rate (about 6.78 × 10), respectively, for the examples of the present invention-7mm3N-1m-1) It can be seen that the average coefficient of friction and the wear rate are both small, showing excellent tribological performance.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the scope of the present invention.
Claims (8)
1. The M50-based bearing self-lubricating material is characterized by mainly comprising a base material, a lubricating phase and a reinforcing phase, wherein M50steel is used as the base material, Sn-Ag-Cu is used as the lubricating phase, CNTs is used as the reinforcing phase, micropores are arrayed on the surface of M50steel, and the Sn-Ag-Cu and the CNTs are filled in the micropores on the surface of the M50 steel.
2. The M50-based self-lubricating material for bearing according to claim 1, wherein the surface micro holes are in the form of a plurality of straight holes arranged in an array.
3. The M50-based bearing self-lubricating material of claim 1, wherein the surface micropores have structural parameters of: the diameter range of each surface micropore is 200-300 mu m, the depth is 800-1000 mu m, and the distance between two adjacent micropores is equal and is 700-1000 mu m.
4. The method for preparing the M50-based bearing self-lubricating material as recited in claim 1, wherein the method comprises the steps of processing a micropore structure on the surface of M50steel by an electric spark micropore electromachining technology, and directly infiltrating Sn-Ag-Cu/CNTs spherical powder into micropores on the surface of M50steel by a high temperature and high pressure infiltration technology to obtain the M50-based bearing self-lubricating material.
5. The method for preparing the M50-based bearing self-lubricating material according to claim 4, wherein the electrical discharge machining parameters of the micro-hole electric discharge machining technology are as follows: the pulse width is 600-900 nS, the range between pulses is 400-700 nS, and the peak current range is 0.1-1A.
6. The preparation method of the M50-based bearing self-lubricating material as claimed in claim 4, wherein the preparation method of the Sn-Ag-Cu/CNTs spherical powder comprises the following steps:
1) weighing simple substance powder of the Sn-Ag-Cu alloy as a first raw material according to the composition elements and the content of the composition elements; weighing a certain amount of CNTs powder as a second raw material; mixing the first raw material and the second raw material to obtain an initial ingredient;
2) melting the initial ingredients obtained in the step 1) in vacuum or inert atmosphere to obtain a molten liquid;
3) and atomizing the melt, cooling and solidifying the melt drops obtained by atomization to form spherical powder, namely Sn-Ag-Cu/CNTs spherical powder.
7. The preparation method of the M50-based bearing self-lubricating material according to claim 6, wherein in the step 1), the specific gravity of the Sn powder, the Ag powder, the Cu powder and the CNTs powder is as follows: (45-55): (30-40): (5-10): (1-2).
8. The method for preparing the M50-based bearing self-lubricating material according to claim 4, wherein the high temperature and high pressure infiltration process parameters are as follows: the infiltration temperature is 500-650 ℃, the heating power is 60-70 kW, the vacuum degree is 0.80-0.93 Pa, the pressure is provided by argon, and the pressure change is 0.72-0.82 Mp.
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| CN115044901B (en) * | 2022-06-16 | 2023-09-15 | 西安工业大学 | Ordered microporous wear-resistant self-lubricating coating and preparation method thereof |
| CN115110078A (en) * | 2022-07-05 | 2022-09-27 | 武汉理工大学深圳研究院 | MXene-Sn-Ag-Cu enhanced CSS-42L-based self-lubricating composite material and preparation method thereof |
| CN115110078B (en) * | 2022-07-05 | 2023-11-17 | 武汉理工大学深圳研究院 | MXene-Sn-Ag-Cu reinforced CSS-42L-based self-lubricating composite material and preparation method thereof |
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