CN113215446A - Metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate and preparation method thereof - Google Patents
Metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C22C1/04—Making non-ferrous alloys by powder metallurgy
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
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Abstract
The invention provides a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, belonging to the technical field of lubricating materials. The metal-based solid lubricating composite material provided by the invention is prepared from the following raw materials in percentage by mass: 78-88% of nickel powder; 8-16% of molybdenum powder; 3-7% of strontium sulfate. The invention uses nickel powder, molybdenum powder and strontium sulfate as basic raw materials, and the cost is low; during sintering, strontium sulfate decomposes to cause partial oxidation of Ni and Mo to form molybdenum oxide and nickel oxide, which respectively undergo solid-phase reaction with SrO formed by decomposition of strontium sulfate to form SrMoO4And Sr2NiMoO6The phase, unoxidized Ni and Mo form a Ni (Mo) solid solution. SrMoO4And Sr2NiMoO6Phase as solid lubricant, with Ni (Mo) solid solution structureThe metal-based solid lubricating composite material has low friction coefficient and wear rate at room temperature and 800 ℃.
Description
Technical Field
The invention relates to the technical field of lubricating materials, in particular to a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate and a preparation method thereof.
Background
With the development of high-temperature, high-speed and heavy-load in the high-technology fields such as aerospace, petroleum industry and the like, the requirements on the strength, stability and wear resistance at high temperature of high-technology moving parts are more and more strict, and the traditional lubricating materials such as lubricating grease and lubricating oil cannot meet the use requirements of the materials at high temperature and other harsh conditions.
The metal-based solid lubricating composite material consists of a metal matrix and a solid lubricant, wherein the solid lubricant is uniformly distributed in the metal matrix. The solid lubricant can directly generate physical separation on the contact surface between high-technology moving parts, and particularly forms a lubricating film on the friction surface, thereby avoiding the direct contact between the moving parts and achieving the effects of reducing friction and preventing abrasion. At present, based on the lubricating characteristics of solid lubricants at different temperatures, room-temperature and high-temperature lubrication is realized by utilizing the synergistic effect between the solid lubricants, for example, Ag and graphite can improve the tribological performance of a sintered composite material at room temperature (the friction coefficient is between 0.22 and 0.41, and the wear rate is between 3.19 and 41 multiplied by 10-14m3·N-1·m-1In between). At 800 deg.C, Ag, solid lubricant (CaF)2/BaF2，SrAl4O7) The synergistic lubricating film formed by the synergistic lubricating film and the tribochemical reaction product has a low friction coefficient (0.30-0.33), and the wear rate of the sintered composite material is increased due to the deterioration of the mechanical property of Ag at high temperature. It can be seen that Ag can be effectively modified as a lubricant at room temperature and high temperatureThe friction coefficient and the wear rate of the composite material are well lubricated, but the application of Ag is limited due to the excessive cost. Therefore, through regulation and control among the components of the metal-based lubricating composite material, a novel solid lubricant is developed, and the problems of room-temperature and high-temperature lubrication of the metal-based solid lubricating composite material are solved.
Disclosure of Invention
In view of the above, the present invention aims to provide a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate and a preparation method thereof. The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate provided by the invention is low in cost, and has low friction coefficient and wear rate at room temperature and 800 ℃.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is prepared from the following raw materials in percentage by mass:
78-88% of nickel powder;
8-16% of molybdenum powder;
3-7% of strontium sulfate.
Preferably, the material is prepared from the following raw materials in percentage by mass:
79-86% of nickel powder;
9-15% of molybdenum powder;
5-6% of strontium sulfate.
Preferably, the particle size of the nickel powder is 10-74 μm, the particle size of the molybdenum powder is 10-74 μm, and the particle size of the strontium sulfate is 10-74 μm.
Preferably, the purity of the nickel powder is more than or equal to 99.5%, the purity of the molybdenum powder is more than or equal to 99.5%, and the purity of the strontium sulfate is more than or equal to 99.7%.
The invention provides a preparation method of the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which comprises the following steps:
(1) carrying out ball milling and mixing on nickel powder, molybdenum powder and strontium sulfate to obtain mixed powder;
(2) and sequentially carrying out press forming and vacuum hot-pressing sintering on the mixed powder to obtain the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate.
Preferably, the ball milling mixing is as follows:
carrying out first wet ball milling on nickel powder and molybdenum powder to obtain premixed powder;
and carrying out second wet ball milling on the premixed powder and strontium sulfate to obtain mixed powder.
Preferably, the rotating speed of the first wet ball milling is 200-400 r/min, and the time is 10-30 h; the rotation speed of the second wet ball milling is 200-400 r/min, and the time is 10-30 h.
Preferably, the pressure of the compression molding is 5-10 MPa, and the time is 20-40 s.
Preferably, the temperature of the vacuum hot-pressing sintering is 1060-1150 ℃, the pressure is 20-30 MPa, and the vacuum degree is less than or equal to 1.0 multiplied by 10-2Pa, the time is 30-120 min.
The invention provides a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is prepared from the following raw materials in percentage by mass: 78-88% of nickel powder; 8-16% of molybdenum powder; 3-7% of strontium sulfate. The invention uses nickel powder, molybdenum powder and strontium sulfate as basic raw materials, and the cost is low; in the vacuum hot-pressing sintering process, strontium sulfate is decomposed to cause partial oxidation of Ni and Mo to form molybdenum oxide and nickel oxide, which respectively undergo solid-phase reaction with SrO formed by decomposition of strontium sulfate to form SrMoO4And Sr2NiMoO6The phase, unoxidized Ni and Mo form a Ni (Mo) solid solution. SrMoO4And Sr2NiMoO6The phase is used as a solid lubricant and forms a metal-based solid lubricating composite material with Ni (Mo) solid solution; and SrMoO4And Sr2NiMoO6The phase has a synergistic lubrication effect, and can form a synergistic lubrication film with a low friction coefficient on the surface of the material, so that the metal-based solid lubrication composite material has a low friction coefficient and a low wear rate at room temperature and 800 ℃. The embodiment result shows that the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate has the friction coefficient of 0.27-0.31 and the wear rate of 0.11 to E at room temperature0.17×10-14m3·N-1·m-1(ii) a The friction coefficient at 800 ℃ is 0.26-0.32, and the wear rate is 1.26-8.92 multiplied by 10-14m3·N-1·m-1。
The invention provides a preparation method of the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which adopts the modes of ball milling, press forming and vacuum hot-pressing sintering, is simple and convenient to operate and is easy for industrial production.
Drawings
FIG. 1 is an X-ray diffraction pattern of mixed raw material powders of examples 1 to 4 and comparative examples 1 to 2;
FIG. 2 is an X-ray diffraction pattern of the metal-based solid lubricating composite material obtained in examples 1 to 4 and comparative examples 1 to 2.
Detailed Description
The invention provides a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is prepared from the following raw materials in percentage by mass:
78-88% of nickel powder;
8-16% of molybdenum powder;
3-7% of strontium sulfate.
Unless otherwise specified, the starting materials used in the present invention are commercially available.
The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate comprises 78-88% of nickel powder by mass percentage, and preferably 79-86% of nickel powder by mass percentage. In the present invention, the particle size of the nickel powder is preferably 10 to 74 μm, and more preferably 30 to 50 μm. In the invention, the purity of the nickel powder is preferably more than or equal to 99.5%.
The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate provided by the invention comprises 8-16% of molybdenum powder by mass percentage, and preferably 9-15%. In the present invention, the particle size of the molybdenum powder is preferably 10 to 74 μm, and more preferably 30 to 50 μm. In the present invention, the purity of the molybdenum powder is preferably not less than 99.5%.
The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate provided by the invention comprises 3-7% of strontium sulfate by mass percentage, and more preferably 5-6% of strontium sulfate by mass percentage. In the present invention, the particle size of the strontium sulfate is preferably 10 to 74 μm, and more preferably 30 to 50 μm. In the present invention, the purity of the strontium sulfate is preferably 99.7% or more.
In the invention, the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate has the friction coefficient of 0.27-0.31 at room temperature and the wear rate of 0.11-0.17 x 10-14m3·N-1·m-1(ii) a The friction coefficient at 800 ℃ is 0.26-0.32, and the wear rate is 1.26-8.92 multiplied by 10-14m3·N-1·m-1。
The invention provides a preparation method of the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which comprises the following steps:
(1) carrying out ball milling and mixing on nickel powder, molybdenum powder and strontium sulfate to obtain mixed powder;
(2) and sequentially carrying out press forming and vacuum hot-pressing sintering on the mixed powder to obtain the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate.
The method comprises the step of ball-milling and mixing nickel powder, molybdenum powder and strontium sulfate to obtain mixed powder. In the present invention, the ball milling mixing is preferably:
carrying out first wet ball milling on nickel powder and molybdenum powder to obtain premixed powder;
and carrying out second wet ball milling on the premixed powder and strontium sulfate to obtain mixed powder.
The first wet ball milling and the second wet ball milling are preferably performed using a planetary high energy ball mill. In the invention, the ball milling media of the first wet ball milling and the second wet ball milling are preferably stainless steel balls with the diameter of 3-10 mm, and the ball-to-material ratio of the first wet ball milling and the second wet ball milling is preferably 5-15: 1 independently, and more preferably 8-12: 1 independently. In the invention, the dispersion medium of the first wet ball milling and the second wet ball milling is preferably ethanol, and the dosage ratio of the dispersion medium to the material is preferably 1mL:1 g. In the invention, the rotating speed of the first wet ball milling is preferably 200-400 r/min, and more preferably 300 r/min; the time of the first wet ball milling is preferably 10-30 hours, and more preferably 15-25 hours. In the invention, the rotation speed of the second wet ball milling is preferably 200-400 r/min, and more preferably 300 r/min; the second wet ball milling time is preferably 10-30 hours, and more preferably 15-25 hours.
After the mixed powder is obtained, the mixed powder is sequentially subjected to press forming and vacuum hot-pressing sintering to obtain the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate. In the invention, the compression molding is preferably carried out in a graphite mold, and the pressure of the compression molding is preferably 5-10 MPa, and more preferably 6-8 MPa; the time is preferably 20 to 40s, and more preferably 25 to 35 s. In the present invention, the temperature of the press molding is preferably room temperature.
In the invention, the vacuum hot-pressing sintering is preferably carried out in a vacuum hot-pressing sintering furnace, and the temperature of the vacuum hot-pressing sintering is preferably 1060-1150 ℃, more preferably 1080-1120 ℃, and further preferably 1110 ℃; the pressure of the vacuum hot-pressing sintering is preferably 20-30 MPa, and more preferably 25 MPa; the vacuum degree of the vacuum hot pressing sintering is preferably less than or equal to 1.0 multiplied by 10-2Pa, the time is preferably 30-120 min, and more preferably 60-90 min. In the vacuum hot-pressing sintering process, strontium sulfate is decomposed to cause partial oxidation of Ni and Mo to form molybdenum oxide and nickel oxide, which respectively react with SrO formed by decomposition of strontium sulfate in a solid-phase manner to form SrMoO4And Sr2NiMoO6The phase, unoxidized Ni and Mo form a Ni (Mo) solid solution. SrMoO4And Sr2NiMoO6The phase is used as a solid lubricant and forms a metal-based solid lubricating composite material with Ni (Mo) solid solution. After the vacuum hot-pressing sintering is completed, the metal-based solid lubricating composite material is preferably cooled. The cooling method of the present invention has no special requirement, and the cooling method known to those skilled in the art can be used, specifically, the cooling method is used for cooling to room temperature along with the furnace.
The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate and the method for preparing the same according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
A metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate is prepared from the following raw materials in percentage by mass: 80.75 percent of 50 mu m nickel powder; 14.25 percent of 50-micron molybdenum powder; 5% of 50 μm strontium sulfate.
The preparation method comprises the following steps:
(1) mixing nickel powder and molybdenum powder, adding absolute ethyl alcohol into a planetary high-energy ball mill, and carrying out ball milling on the nickel powder and the molybdenum powder for 10 hours at a rotation speed of 250r/min, wherein the ball-to-material ratio is 10: 1, obtaining premixed powder;
(2) mixing the premixed powder and strontium sulfate, and carrying out ball milling treatment, wherein the ball milling time is 10 hours, and the rotating speed is 250r/min, so as to obtain mixed powder;
(3) putting the mixed powder into a graphite die for compression molding, wherein the pressure of the compression molding is 10MPa, and the pressure maintaining time is 20s, so as to obtain a molding material;
(4) placing the obtained molding material into a vacuum hot-pressing sintering furnace at 1.0 × 10-2At the temperature of Pa and 1100 ℃, applying pressure of 20MPa, preserving heat for 60min, cooling along with the furnace to room temperature, taking out a sample, and obtaining the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is recorded as Ni-14.25Mo-5SrSO4。
Example 2
A metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate is prepared from the following raw materials in percentage by mass: 79% of 50-micron nickel powder; 15% of 50-micron molybdenum powder; 6% of 50 μm strontium sulfate.
The preparation method comprises the following steps:
(1) mixing nickel powder and molybdenum powder, adding absolute ethyl alcohol into a planetary high-energy ball mill, and carrying out ball milling on the nickel powder and the molybdenum powder for 15 hours at the rotating speed of 300r/min, wherein the ball-material ratio is 5:1, obtaining premixed powder;
(2) mixing the premixed powder and strontium sulfate, and carrying out ball milling treatment, wherein the ball milling time is 15 hours, and the rotating speed is 300r/min, so as to obtain mixed powder;
(3) putting the mixed powder into a graphite die for compression molding, wherein the pressure of the compression molding is 5MPa, and the pressure maintaining time is 30s, so as to obtain a molding material;
(4) placing the obtained molding material into a vacuum hot-pressing sintering furnace at 1.0 × 10-2At the temperature of Pa and 1060 ℃, applying pressure of 25MPa, preserving heat for 90min, cooling along with the furnace to room temperature, taking out a sample, and obtaining the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is recorded as Ni-15Mo-6SrSO4。
Example 3
A metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate is prepared from the following raw materials in percentage by mass: 85% of 50-micron nickel powder; 8% of 50-micron molybdenum powder; 50 μm strontium sulfate 7%.
The preparation method comprises the following steps:
(1) mixing nickel powder and molybdenum powder, adding absolute ethyl alcohol into a planetary high-energy ball mill, and carrying out ball milling on the nickel powder and the molybdenum powder for 25 hours at the rotating speed of 400r/min, wherein the ball-to-material ratio is 5:1, obtaining premixed powder;
(2) mixing the premixed powder with strontium sulfate, and carrying out ball milling treatment, wherein the ball milling time is 25 hours, and the rotating speed is 400r/min, so as to obtain mixed powder;
(3) putting the mixed powder into a graphite die for compression molding, wherein the pressure of the compression molding is 8MPa, and the pressure maintaining time is 40s, so as to obtain a molding material;
(4) placing the obtained molding material into a vacuum hot-pressing sintering furnace at 1.0 × 10-2At the temperature of Pa and 1150 ℃, applying pressure of 30MPa, preserving heat for 120min, cooling along with the furnace to room temperature, taking out a sample, and obtaining the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is recorded as Ni-8Mo-7SrSO4。
Example 4
A metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate is prepared from the following raw materials in percentage by mass: 82% of 50 μm nickel powder; 13% of 50-micron molybdenum powder; 5% of 50 μm strontium sulfate.
The preparation method comprises the following steps:
(1) mixing nickel powder and molybdenum powder, adding absolute ethyl alcohol into a planetary high-energy ball mill, and carrying out ball milling on the nickel powder and the molybdenum powder for 10 hours at a rotation speed of 250r/min, wherein the ball-to-material ratio is 10: 1, obtaining premixed powder;
(2) mixing the premixed powder and strontium sulfate, and carrying out ball milling treatment, wherein the ball milling time is 10 hours, and the rotating speed is 250r/min, so as to obtain mixed powder;
(3) putting the mixed powder into a graphite die for compression molding, wherein the pressure of the compression molding is 10MPa, and the pressure maintaining time is 20s, so as to obtain a molding material;
(4) placing the obtained molding material into a vacuum hot-pressing sintering furnace at 1.0 × 10-2At the temperature of Pa and 1100 ℃, applying pressure of 20MPa, preserving heat for 60min, cooling along with the furnace to room temperature, taking out a sample, and obtaining the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate, which is recorded as Ni-13Mo-5SrSO4。
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the raw material dosage is 90.25 percent of nickel powder by mass percentage; 4.75 percent of molybdenum powder; 5 percent of strontium sulfate, the rest operations are the same, and the obtained metal-based solid lubricating composite material is marked as Ni-4.75Mo-5SrSO4。
Comparative example 2
The difference between the comparative example 2 and the example 1 is that the raw material dosage is 76 percent of nickel powder by mass percentage; 19% of molybdenum powder; 5 percent of strontium sulfate and the rest operations are the same, and the obtained metal-based solid lubricating composite material is marked as Ni-19Mo-5SrSO4。
Performance testing
The mixed raw material powders of examples 1 to 4 and comparative examples 1 to 2 and the sintered metal-based solid lubricating composite material were subjected to X-ray diffraction analysis, wherein the X-ray diffraction pattern of the mixed raw material powder is shown in fig. 1, and the X-ray diffraction pattern of the obtained metal-based solid lubricating composite material is shown in fig. 2. As can be seen from FIGS. 1 and 2, the composition of the metal-based solid lubricating composite material of examples 1 to 4 was Ni (Mo) solid solution, SrMoO4，Sr2NiMoO6And SrO. The phase composition of the metal-based solid lubricating composite of comparative example 1 was Ni (Mo) solid solution, SrMoO4，Sr2NiMoO6And SrO. The phase composition of the metal-based solid lubricating composite material of comparative example 2 was Ni (Mo) solid solution, Sr2NiMoO6And SrO.
The friction coefficient and the wear rate of the metal-based solid lubricating composite materials obtained in examples 1 to 4 and comparative examples 1 to 2 were measured, and the obtained results are shown in table 1. The test conditions were: the load is 3N, the sliding speed is 400r/min, the test temperature is room temperature (25 ℃) and 800 ℃, and the test time is 1 h.
TABLE 1 Friction coefficient and wear rate of the metal-based solid lubricating composite materials obtained in examples 1 to 4 and comparative examples 1 to 2
The metal-based solid lubricating composite materials of examples 1 to 4 had low friction coefficient and wear rate at room temperature and 800 ℃, and formed SrMoO mainly with the wear surface4And Sr2NiMoO6The composition is related to a synergistic lubricating film. At 800 c, the composite wear surface prepared in comparative example 1 was severely oxidatively worn by oxidation, resulting in a high wear rate, while at room temperature, the composite wear surface prepared in comparative example 2 was adhesively worn resulting in an increased coefficient of friction. It can be seen that the Ni, Mo and SrSO4The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate provided by the invention has low friction coefficient and wear rate at room temperature and 800 ℃.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate is prepared from the following raw materials in percentage by mass:
78-88% of nickel powder;
8-16% of molybdenum powder;
3-7% of strontium sulfate.
2. The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate according to claim 1, which is prepared from the following raw materials in percentage by mass:
79-86% of nickel powder;
9-15% of molybdenum powder;
5-6% of strontium sulfate.
3. The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate according to claim 1 or 2, wherein the particle size of the nickel powder is 10 to 74 μm, the particle size of the molybdenum powder is 10 to 74 μm, and the particle size of the strontium sulfate is 10 to 74 μm.
4. The metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate according to claim 1 or 2, wherein the purity of the nickel powder is not less than 99.5%, the purity of the molybdenum powder is not less than 99.5%, and the purity of the strontium sulfate is not less than 99.7%.
5. The method for preparing a metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate according to any one of claims 1 to 4, comprising the steps of:
(1) carrying out ball milling and mixing on nickel powder, molybdenum powder and strontium sulfate to obtain mixed powder;
(2) and sequentially carrying out press forming and vacuum hot-pressing sintering on the mixed powder to obtain the metal-based solid lubricating composite material containing strontium molybdate and strontium nickel molybdate.
6. The method of claim 5, wherein the ball milling mixing is:
carrying out first wet ball milling on nickel powder and molybdenum powder to obtain premixed powder;
and carrying out second wet ball milling on the premixed powder and strontium sulfate to obtain mixed powder.
7. The preparation method of claim 6, wherein the rotation speed of the first wet ball milling is 200-400 r/min, and the time is 10-30 h; the rotation speed of the second wet ball milling is 200-400 r/min, and the time is 10-30 h.
8. The preparation method according to claim 5, wherein the pressure of the press molding is 5 to 10MPa, and the time is 20 to 40 s.
9. The preparation method according to claim 5, wherein the temperature of the vacuum hot-pressing sintering is 1060-1150 ℃, the pressure is 20-30 MPa, and the vacuum degree is less than or equal to 1.0 x 10-2Pa, the time is 30-120 min.
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| CN116219247A (en) * | 2023-01-30 | 2023-06-06 | 西安石油大学 | SrMo-containing material 5 O 8 Molybdenum-based lubricating composite material and preparation method thereof |
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