Bearing lubricating coating and using method

Abstract

The invention provides a bearing lubricating coating and a using method thereof, and the bearing lubricating coating comprises the following components in parts by weight: 40-45 parts of polyimide, 25-30 parts of polytetrafluoroethylene, 8-10 parts of nickel powder, 6-8 parts of magnesium oxide, 6-8 parts of aluminum oxide and 5-7 parts of an auxiliary agent. The mixed resin formed by polyimide and polytetrafluoroethylene can improve the friction and wear performance of the bearing lubricating coating, and the nickel powder can improve the bonding strength between the bearing lubricating coating and the foil; the magnesium oxide and the aluminum oxide in the bearing lubricating coating can form a magnesium aluminate spinel structure in a high-temperature and high-speed environment, so that the thermal vibration stability and the surface hardness of the bearing lubricating coating are improved, and the performance of the bearing lubricating coating is kept stable at a high temperature and a high speed.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing lubrication, and in particular to a bearing lubricating coating and a use method thereof. Background Art

[0002] An air bearing is a fluid-film lubricated bearing that uses gas as a lubricating medium. It consists of a bearing sleeve, foil, and elastic support components. Its working principle is that when the rotor runs at high speed, viscous gas is drawn into the bearing, forming a dynamic pressure air film in the wedge-shaped space between the foil and the rotor, thereby levitating the rotor and achieving frictionless motion. Because air bearings use gas lubrication, they do not pollute the working fluid and have found widespread application in aerospace, air circulation, cryogenic refrigeration, and other fields. However, during the start-up and shutdown phases of an air bearing, if the shaft speed falls below the bearing's critical takeoff speed, an effective dynamic pressure air film cannot form between the two, resulting in contact friction. This can cause surface wear, high starting torque, and reduced lifespan.

[0003] In order to solve this industry problem and avoid or reduce the wear of foils and bearings, it is necessary to apply a lubricating coating on the foil surface to improve the lubrication performance of the bearing surface and extend the start-stop life.

[0004] When the air bearing is running at high speed, the temperature of the lubricating coating will also rise. If it is in a high temperature environment for a long time, the wear rate and lubricating ability of the lubricating coating will be affected, resulting in unstable performance of the lubricating coating at different temperatures, which affects the operating stability of the air bearing. Therefore, it is necessary to design a bearing lubricating coating that can ensure that the air bearing can always operate stably in a high temperature and high speed environment. Summary of the Invention

[0005] In order to overcome the problems existing in the related art, one of the purposes of the present invention is to provide a bearing lubricating coating. By improving the formula, the friction and wear performance and thermal vibration stability of the bearing lubricating coating are improved, ensuring that the air-floating bearing can operate stably in a high-temperature and high-speed environment.

[0006] A bearing lubricating coating comprises the following components in parts by weight:

[0007] 40-45 parts of polyimide, 25-30 parts of polytetrafluoroethylene, 8-10 parts of nickel powder, 6-8 parts of magnesium oxide, 6-8 parts of aluminum oxide, and 5-7 parts of additives.

[0008] In a preferred technical solution of the present invention, the following components are included in parts by weight:

[0009] 43 parts of polyimide, 27 parts of polytetrafluoroethylene, 9 parts of nickel powder, 7 parts of magnesium oxide, 7 parts of aluminum oxide, and 6 parts of additives.

[0010] In a preferred technical solution of the present invention, the auxiliary agent is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, and the mass ratio of the zinc dialkyl dithiophosphate to tricresyl phosphate is 1:1.

[0011] A second object of the present application is to provide a method for using the bearing lubricating coating as described above, comprising:

[0012] Add polytetrafluoroethylene, nickel powder, magnesium oxide and aluminum oxide powder into the polyimide solution and mix well;

[0013] Adding additives and mixing evenly to obtain bearing lubricating fluid;

[0014] spraying the bearing lubricating fluid onto the bearing surface using a spray gun;

[0015] The bearing lubricating liquid on the bearing surface is dried to form a bearing lubricating coating on the bearing surface.

[0016] In a preferred technical solution of the present invention, before applying the bearing lubricant, the bearing surface is subjected to heat treatment, and the heat treatment includes:

[0017] Heat the bearing surface to 900-970℃, keep it warm for 0.5-1h, then cool it down to 700-750℃ with the furnace, keep it warm for 6-8h, then cool it down to 600-630℃ with the furnace, then cool it down to room temperature with the furnace after keeping it warm for 5-8h.

[0018] In a preferred technical solution of the present invention, before applying the bearing lubricant, the bearing surface is pretreated, and the pretreatment includes:

[0019] The surface of the bearing to be coated is polished with sandpaper, the bearing surface is ultrasonically cleaned with an isoparaffin cleaning agent, and the bearing surface is blown dry after cleaning.

[0020] In a preferred technical solution of the present invention, during the process of spraying the bearing lubricating fluid using a spray gun, the temperature of the bearing surface is maintained at 80-120°C.

[0021] In a preferred technical solution of the present invention, the thickness of the bearing lubricating coating is 22 to 50 microns.

[0022] In a preferred technical solution of the present invention, when spraying the bearing lubricant using a spray gun, the bearing surface temperature, the spraying speed of the spray gun and the flow rate of the spray gun are regulated to ensure that the bearing lubricant dries to form a film within 5 to 10 seconds after spraying.

[0023] In a preferred technical solution of the present invention, drying the bearing lubricating liquid on the bearing surface includes:

[0024] After spraying, the bearing surface is heated to 180-200℃ and kept warm for one hour, then heated to 230-250℃ and kept warm for one hour, then heated to 280-300℃ and kept warm for one hour, and then cooled to room temperature.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a bearing lubricating coating, comprising the following components in parts by weight: 40-45 parts of polyimide, 25-30 parts of polytetrafluoroethylene, 8-10 parts of nickel powder, 6-8 parts of magnesium oxide, 6-8 parts of aluminum oxide, and 5-7 parts of an additive; the mixed resin formed by the polyimide and polytetrafluoroethylene in the present application can improve the friction and wear performance of the bearing lubricating coating, and the nickel powder can improve the bonding strength between the bearing lubricating coating and the foil; the magnesium oxide and aluminum oxide in the bearing lubricating coating of the present application can form a magnesium-aluminum spinel structure under a high-temperature and high-speed environment, thereby improving the thermal vibration stability and surface hardness of the bearing lubricating coating, and ensuring that the bearing lubricating coating maintains stable performance under high temperature and high speed.

[0027] This application provides a method for applying a bearing lubricating coating, comprising: adding polytetrafluoroethylene, nickel powder, magnesium oxide, and aluminum oxide powder to a polyimide solution and mixing uniformly; adding an additive and mixing uniformly to obtain a bearing lubricating liquid; spraying the bearing lubricating liquid onto a foil using a spray gun; the bearing includes the foil; and drying the bearing lubricating liquid on the foil to form a bearing lubricating coating on the foil. Applying the bearing lubricating coating using a spray gun is simple and convenient, and ensures uniform film formation of the bearing lubricating coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the overall structure of one type of radial foil;

[0029] Figure 2 for Figure 1 Top view of the mid-radial foil;

[0030] Figure 3 A schematic diagram of the structure of one type of axial foil;

[0031] Figure 4 A flow chart of the method for using the bearing lubricating coating in this application.

[0032] Reference numerals:

[0033] 11. Radial foil; 12. Axial foil. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0035] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a," "the," and "the" used in this invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0037] The present application provides a bearing lubricating coating comprising the following components by weight: 40-45 parts polyimide, 25-30 parts polytetrafluoroethylene, 8-10 parts nickel powder, 6-8 parts magnesium oxide, 6-8 parts aluminum oxide, and 5-7 parts additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the weight ratio of the zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0038] In this application, the bearing lubricating coating is applied to the sliding contact area of ​​the air bearing, such as the inner ring, outer ring and rolling element surface of the bearing. This application is described by spraying on the radial foil of the air bearing as an example. Figure 1 and Figure 2 As shown in FIG, it is a schematic diagram of the structure of one radial foil, the radial foil 11 is a ring structure with a gap, and the bearing lubricating coating is applied on the inner wall of the radial foil. Figure 3 FIG. 1 is a schematic diagram of the structure of one type of axial foil, wherein the axial foil 12 is a fan-shaped structure, and multiple axial foils 12 are spliced ​​together to form a circle. In actual operation, the bearing lubricating coating can be sprayed on any position of sliding contact in the air bearing.

[0039] like Figure 4As shown, the present application also provides a method for using a bearing lubricating coating, comprising:

[0040] S1: Add polytetrafluoroethylene, nickel powder, magnesium oxide and aluminum oxide powder into the polyimide solution and mix well;

[0041] S2: Add additives and mix evenly to obtain bearing lubricating fluid;

[0042] S3: using a spray gun to spray the bearing lubricating fluid onto the bearing surface; specifically comprising:

[0043] S31: Before applying bearing lubricant, the bearing surface is heat treated. The heat treatment includes:

[0044] Heat the bearing surface to 900-970°C, hold it for 0.5-1 hour, then cool it down to 700-750°C in the furnace. Hold it for 6-8 hours, then cool it down to 600-630°C in the furnace. Hold it for 5-8 hours, then cool it down to room temperature in the furnace. Heat treatment can improve the bonding strength of the bearing surface, thereby improving the adhesion and performance stability of the bearing lubricant coating.

[0045] S32: Before applying bearing lubricant, the bearing surface is pretreated. The pretreatment includes:

[0046] The bearing surface to be coated is sanded with sandpaper, ultrasonically cleaned with an isoparaffin detergent, and then air-dried. Heat treatment can improve the bonding strength of the bearing surface, thereby improving the adhesion and performance stability of the bearing lubricant coating.

[0047] S33: Use a spray gun to spray the bearing lubricant. During the spraying process, the temperature of the bearing surface is maintained at 80-120°C, and the thickness of the bearing lubricant coating is 22-50 microns. By regulating the bearing surface temperature, the spraying speed of the spray gun, and the flow rate of the spray gun, ensure that the bearing lubricant dries to form a film within 5-10 seconds after spraying.

[0048] During the spraying process, it is necessary to observe the drying speed of the bearing lubricant in real time. The best time for the spray surface to dry and form a film is 5 to 10 seconds. The drying and film-forming speed can be adjusted by controlling the preheating temperature of the bearing surface, the scanning speed of the spray gun, and the flow rate of the spray gun. By adjusting the above three parameters, it is ensured that the bearing lubricant dries and forms a film within 5 to 10 seconds.

[0049] The bearing surface preheat temperature, spray gun sweep speed, and spray gun flow rate determine the surface dry time of the bearing lubricant—the time it takes for the surface to dry and form a film. Immediate drying after spraying may be due to excessively high bearing surface temperature, too slow a spray gun sweep speed, or too low a flow rate. Excessively rapid drying can lead to uneven stress or wrinkles in the bearing lubricant coating, and can also reduce adhesion between the bearing lubricant coating and the bearing surface, affecting the coating's adhesion and high- and low-temperature resistance.

[0050] If the coating does not dry for more than ten seconds after spraying, it may be because the bearing surface temperature is too low, the spray gun is spraying too fast, or the flow rate of the spray gun is too high. Slow drying may cause the bearing lubricant coating to have a large surface roughness, affecting the friction coefficient and wear rate of the bearing lubricant coating.

[0051] If the drying film-forming time of the bearing lubricant is found to be too short or too long, spraying must be stopped immediately and the above three parameters must be adjusted.

[0052] This application ensures that the performance of the bearing lubricating coating is uniform and consistent by controlling the drying and film-forming speed of the bearing lubricating fluid, and that there is no tension or stress inside the film layer, thereby ensuring that the bearing lubricating coating has strong adhesion to the bearing surface and stable performance.

[0053] S4: Drying the bearing lubricant on the bearing surface to form a bearing lubricant coating on the bearing surface. Specifically, the bearing surface after spraying is heated to 180-200°C and kept at this temperature for one hour, then heated to 230-250°C and kept at this temperature for one hour, then heated to 280-300°C and kept at this temperature for one hour, and then cooled to room temperature.

[0054] The mixed resin formed by polyimide and polytetrafluoroethylene in this application can improve the friction and wear performance of the bearing lubricating coating, and the nickel powder can improve the bonding strength between the bearing lubricating coating and the foil; the magnesium oxide and aluminum oxide in the bearing lubricating coating of this application can form a magnesium-aluminum spinel structure under high temperature and high speed environment, thereby improving the thermal vibration stability and surface hardness of the bearing lubricating coating, and ensuring that the bearing lubricating coating maintains stable performance under high temperature and high speed.

[0055] Example 1

[0056] A bearing lubricating coating comprises the following components in parts by weight: 40 parts polyimide, 30 parts polytetrafluoroethylene, 8 parts nickel powder, 8 parts magnesium oxide, 6 parts aluminum oxide, and 7 parts additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the weight ratio of the zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0057] A method for using a bearing lubricating coating, comprising:

[0058] S1: Add polytetrafluoroethylene, nickel powder, magnesium oxide and aluminum oxide powder into the polyimide solution and mix well;

[0059] S2: Add additives and mix evenly to obtain bearing lubricating fluid;

[0060] S3: using a spray gun to spray the bearing lubricating fluid onto the bearing surface; specifically comprising:

[0061] S31: Heat the bearing surface to 900-970°C, keep it warm for 0.5-1h, then cool it down to 700-750°C with the furnace, keep it warm for 6-8h, then cool it down to 600-630°C with the furnace, and then cool it down to room temperature with the furnace after keeping it warm for 5-8h.

[0062] S32: Sand the bearing surface to be coated with sandpaper, ultrasonically clean the bearing surface with an isoparaffin detergent, and air dry the cleaned bearing surface. Heat treatment can improve the bonding strength of the bearing surface, thereby improving the adhesion and performance stability of the bearing lubricant coating.

[0063] S33: Use a spray gun to spray the bearing lubricant. During the spraying process, the temperature of the bearing surface is maintained at 80-120°C, and the thickness of the bearing lubricant coating is 22-50 microns. By regulating the bearing surface temperature, the spraying speed of the spray gun, and the flow rate of the spray gun, ensure that the bearing lubricant dries to form a film within 5-10 seconds after spraying.

[0064] S4: Drying the bearing lubricant on the bearing surface to form a bearing lubricant coating on the bearing surface. Specifically, the bearing surface after spraying is heated to 180-200°C and kept at this temperature for one hour, then heated to 230-250°C and kept at this temperature for one hour, then heated to 280-300°C and kept at this temperature for one hour, and then cooled to room temperature.

[0065] The air bearing coated with the bearing lubricating coating in this embodiment has been tested to have a lifespan of more than 126,000 starts and stops, thereby increasing the service life of the air bearing.

[0066] Example 2

[0067] A bearing lubricating coating comprises the following components in parts by weight: 45 parts polyimide, 25 parts polytetrafluoroethylene, 10 parts nickel powder, 6 parts magnesium oxide, 8 parts aluminum oxide, and 5 parts an additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the weight ratio of the zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0068] A method for using a bearing lubricating coating, comprising:

[0069] S1: Add polytetrafluoroethylene, nickel powder, magnesium oxide and aluminum oxide powder into the polyimide solution and mix well;

[0070] S2: Add additives and mix evenly to obtain bearing lubricating fluid;

[0071] S3: using a spray gun to spray the bearing lubricating fluid onto the bearing surface; specifically comprising:

[0072] S31: Heat the bearing surface to 900-970°C, keep it warm for 0.5-1h, then cool it down to 700-750°C with the furnace, keep it warm for 6-8h, then cool it down to 600-630°C with the furnace, and then cool it down to room temperature with the furnace after keeping it warm for 5-8h.

[0073] S32: Sand the bearing surface to be coated with sandpaper, ultrasonically clean the bearing surface with an isoparaffin detergent, and air dry the cleaned bearing surface. Heat treatment can improve the bonding strength of the bearing surface, thereby improving the adhesion and performance stability of the bearing lubricant coating.

[0074] S33: Use a spray gun to spray the bearing lubricant. During the spraying process, the temperature of the bearing surface is maintained at 80-120°C, and the thickness of the bearing lubricant coating is 22-50 microns. By regulating the bearing surface temperature, the spraying speed of the spray gun, and the flow rate of the spray gun, ensure that the bearing lubricant dries to form a film within 5-10 seconds after spraying.

[0075] S4: Drying the bearing lubricant on the bearing surface to form a bearing lubricant coating on the bearing surface. Specifically, the bearing surface after spraying is heated to 180-200°C and kept at this temperature for one hour, then heated to 230-250°C and kept at this temperature for one hour, then heated to 280-300°C and kept at this temperature for one hour, and then cooled to room temperature.

[0076] The air bearing coated with the bearing lubricating coating in this embodiment has been tested to have a lifespan of more than 126,000 starts and stops, thereby increasing the service life of the air bearing.

[0077] Example 3

[0078] A bearing lubricating coating comprises the following components in parts by weight: 43 parts polyimide, 27 parts polytetrafluoroethylene, 9 parts nickel powder, 7 parts magnesium oxide, 7 parts aluminum oxide, and 6 parts an additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the weight ratio of the zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0079] A method for using a bearing lubricating coating, comprising:

[0080] S1: Add polytetrafluoroethylene, nickel powder, magnesium oxide and aluminum oxide powder into the polyimide solution and mix well;

[0081] S2: Add additives and mix evenly to obtain bearing lubricating fluid;

[0082] S3: using a spray gun to spray the bearing lubricating fluid onto the bearing surface; specifically comprising:

[0083] S31: Heat the bearing surface to 900-970°C, keep it warm for 0.5-1h, then cool it down to 700-750°C with the furnace, keep it warm for 6-8h, then cool it down to 600-630°C with the furnace, and then cool it down to room temperature with the furnace after keeping it warm for 5-8h.

[0084] S32: Sand the bearing surface to be coated with sandpaper, ultrasonically clean the bearing surface with an isoparaffin detergent, and air dry the cleaned bearing surface. Heat treatment can improve the bonding strength of the bearing surface, thereby improving the adhesion and performance stability of the bearing lubricant coating.

[0085] S33: Use a spray gun to spray the bearing lubricant. During the spraying process, the temperature of the bearing surface is maintained at 80-120°C, and the thickness of the bearing lubricant coating is 22-50 microns. By regulating the bearing surface temperature, the spraying speed of the spray gun, and the flow rate of the spray gun, ensure that the bearing lubricant dries to form a film within 5-10 seconds after spraying.

[0086] S4: Drying the bearing lubricant on the bearing surface to form a bearing lubricant coating on the bearing surface. Specifically, the bearing surface after spraying is heated to 180-200°C and kept at this temperature for one hour, then heated to 230-250°C and kept at this temperature for one hour, then heated to 280-300°C and kept at this temperature for one hour, and then cooled to room temperature.

[0087] The air bearing coated with the bearing lubricating coating in this embodiment has been tested to have a lifespan of more than 126,000 starts and stops, thereby increasing the service life of the air bearing.

[0088] Comparative Example 1

[0089] The difference from Example 3 is that a bearing lubricating coating comprises the following components in parts by weight: 43 parts polyimide, 27 parts polytetrafluoroethylene, 9 parts nickel powder, 14 parts magnesium oxide, and 6 parts additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the mass ratio of zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0090] The specific usage method is the same as that in Example 3.

[0091] Comparative Example 2

[0092] The difference from Example 3 is that a bearing lubricating coating comprises the following components in parts by weight: 43 parts polyimide, 27 parts polytetrafluoroethylene, 9 parts nickel powder, 14 parts aluminum oxide, and 6 parts additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the mass ratio of zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0093] The specific usage method is the same as that in Example 3.

[0094] Comparative Example 3

[0095] The difference from Example 3 is that a bearing lubricating coating comprises the following components in parts by weight: 70 parts polyimide, 9 parts nickel powder, 7 parts magnesium oxide, 7 parts aluminum oxide, and 6 parts additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the mass ratio of zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0096] The specific usage method is the same as that in Example 3.

[0097] Comparative Example 4

[0098] The difference from Example 3 is that a bearing lubricating coating comprises the following components in parts by weight: 70 parts polytetrafluoroethylene, 9 parts nickel powder, 7 parts magnesium oxide, 7 parts aluminum oxide, and 6 parts additive. Specifically, the additive is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, with the mass ratio of zinc dialkyl dithiophosphate to tricresyl phosphate being 1:1.

[0099] The specific usage method is the same as that in Example 3.

[0100] Comparative Example 5

[0101] The difference from Example 3 is that: in step S33 of the method of use: use a spray gun to spray the bearing lubricant, the temperature of the bearing surface is maintained at 80-120°C during the spraying process, the thickness of the bearing lubricant coating is 22-50 microns, and by regulating the bearing surface temperature, the spraying speed of the spray gun and the flow rate of the spray gun, it is ensured that the bearing lubricant dries to form a film within 5 seconds after spraying.

[0102] The rest of the formula and usage are the same as in Example 3.

[0103] Comparative Example 6

[0104] The difference from Example 3 is that: in step S33 of the method of use: use a spray gun to spray the bearing lubricant, the temperature of the bearing surface is maintained at 80-120°C during the spraying process, the thickness of the bearing lubricant coating is 22-50 microns, and by regulating the bearing surface temperature, the spraying speed of the spray gun and the flow rate of the spray gun, it is ensured that the bearing lubricant dries to form a film 10 seconds after spraying.

[0105] The rest of the formula and usage are the same as in Example 3.

[0106] Experimental Example 1

[0107] The bearing lubricating coatings in the above-mentioned embodiments and comparative examples were respectively coated on sector-shaped foils to form coated workpieces. The impact resistance, wear resistance, adhesion, high and low temperature resistance, friction coefficient, and wear rate of the bearing lubricating coatings were measured by the following methods. The specific test results are shown in Table 1.

[0108] Impact resistance test experiment: Perform in accordance with the provisions of GB / T 1732 (or ISO6272). Use a QCJ impact tester for the test, use a 1 / 2 punch, and raise the adjusted hammer to a height of 40cm on the slide. Place the specimen with the coating facing upwards on the anvil, with each impact point of the specimen not less than 15mm apart. Press the control button, and the hammer will fall freely on the punch. Lift the hammer to remove the specimen, and record the height at which the hammer falls on the specimen. Impact the same specimen three times at different positions. Observe the specimens that have been subjected to three impact tests with a 4-10x magnifying glass to determine whether the coating has cracking or shedding. Judgment standard: Positive impact: 40kg.cm (no cracking) is qualified.

[0109] Abrasion Resistance Test: Coated circular specimens with a diameter of 120 mm, a thickness of 0.5 to 2.0 mm, and a center hole of 7 mm were subjected to abrasion resistance testing according to the requirements and procedures of ASTM D4060, using a CS-17 wheel and a load of 1000 g. The test was considered acceptable if the weight loss did not exceed 10 mg / 1000 revolutions.

[0110] Adhesion Test: Conduct the test according to GB / T 9286 (or ISO 2409). The specific procedure is as follows: Use the sharp blade of a grid cutter (or paper cutter) to score the specimen with two sets of 11 vertical and 11 horizontal lines, spaced 1 to 3 mm apart (coating thickness δ ≤ 90 μm, 1 mm apart; 90 < δ ≤ 150 μm, 2 mm apart; δ > 150 μm, 3 mm apart), to form a grid of 100 small squares. Apply 3M 600# tape (peel force 15N-18N) to the cut area. Use your fingers to flatten the tape above the grid area, ensuring that the tape extends at least 20 mm beyond the grid. Within 2-5 minutes of applying the tape, hold the free end of the tape and peel it off steadily within 0.5-1.0 seconds at an angle as close to 60° as possible. The test is considered acceptable if no coating comes off after 100 squares.

[0111] High and Low Temperature Resistance Test: Conducted in accordance with the provisions of GB / T 5170.10. The test cycle is 70°C (high temperature) and -40°C (low temperature). Ten cycles are required (the test panel is placed in a high and low temperature chamber, with the temperature raised to 70°C and humidity at 95% within 1 hour and held for 2 hours. The temperature is then lowered to -40°C within 1 hour and held at -40°C for 3 hours. One cycle is considered one cycle). Judgment Criteria: After 10 cycles of high and low temperatures, the paint film is considered acceptable if it is intact, with no cracking, warping, or flaking.

[0112] Friction coefficient test: The bearing lubricating coating is subjected to friction under a load of 5N and a linear speed of 200mm / min, and the friction coefficient is obtained by fitting. Judgment standard: A friction coefficient of less than 0.1 is considered acceptable.

[0113] Wear rate test: Measurements are made using the wear volume method. In this reciprocating friction test, a 5mm diameter Al2O3 sphere rubs against the coated specimen. When it rubs against the coating surface, a wear mark of a certain depth and width is formed. The cross-section of the wear mark matches the sphere, so measuring the surface width of the wear mark can be used to calculate its approximate cross-sectional area. By measuring the wear mark length, the wear volume can be calculated, and thus the wear rate. Judgment criteria: A wear rate of less than 0.005% is considered acceptable.

[0114]

[0115]

[0116] In Comparative Example 1, replacing the aluminum oxide in Example 3 with magnesium oxide resulted in the final bearing lubricating coating failing to meet the high- and low-temperature resistance standards and affecting the wear rate of the bearing lubricating coating. This is likely because magnesium oxide alone cannot form manganese-aluminum spinel, which cannot ensure the thermal stability of the bearing lubricating coating.

[0117] In Comparative Example 2, replacing the magnesium oxide in Example 3 with aluminum oxide resulted in the final bearing lubricating coating failing to meet the high- and low-temperature resistance standards and affecting the wear rate of the bearing lubricating coating. This is likely because aluminum oxide alone cannot form manganese-aluminum spinel, which cannot ensure the thermal stability of the bearing lubricating coating.

[0118] In Comparative Example 3, the polytetrafluoroethylene in Example 3 is replaced by polyimide, resulting in the bearing lubricating coating having unqualified wear resistance and high and low temperature resistance. This indicates that the mixture of polytetrafluoroethylene and polyimide in this application can ensure the friction and wear resistance of the bearing lubricating coating.

[0119] In Comparative Example 4, the polyimide in Example 3 is replaced with polytetrafluoroethylene, resulting in the bearing lubricating coating having unqualified wear resistance and high and low temperature resistance. This indicates that the mixture of polytetrafluoroethylene and polyimide in this application can ensure the friction and wear resistance of the bearing lubricating coating.

[0120] Comparative Example 5 shortened the drying and film-forming speed of the bearing lubricant, severely impacting the adhesion and high- and low-temperature resistance of the bearing lubricant coating. This suggests that controlling the drying and film-forming speed of the bearing lubricant ensures uniform performance of the bearing lubricant coating, freeing the film from tension and stress, and ensuring strong adhesion and stable performance between the bearing lubricant coating and the bearing surface.

[0121] Comparative Example 6 prolonged the drying and film-forming speed of the bearing lubricant, severely affecting the friction coefficient and wear rate of the bearing lubricant coating. This indicates that controlling the drying and film-forming speed of the bearing lubricant ensures uniform and consistent performance of the bearing lubricant coating, freeing the film from tension and stress, ensuring strong adhesion between the bearing lubricant coating and the bearing surface, and stable performance.

[0122] In summary, the mixed resin formed by polyimide and polytetrafluoroethylene in the present application can improve the friction and wear performance of the bearing lubricating coating, and the nickel powder can improve the bonding strength between the bearing lubricating coating and the foil; the magnesium oxide and aluminum oxide in the bearing lubricating coating of the present application can form a magnesium-aluminum spinel structure under a high temperature and high speed environment, thereby improving the thermal vibration stability and surface hardness of the bearing lubricating coating, and ensuring that the bearing lubricating coating maintains stable performance under high temperature and high speed.

[0123] The present application provides a method for using a bearing lubricating coating, which is applied by a spray gun. The operation is simple and convenient, and can ensure the uniformity of the film formation of the bearing lubricating coating.

[0124] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures. In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0125] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0126] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0127] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A bearing lubricating coating, characterized in that: The composition comprises the following components in parts by weight: 40-45 parts of polyimide, 25-30 parts of polytetrafluoroethylene, 8-10 parts of nickel powder, 6-8 parts of magnesium oxide, 6-8 parts of aluminum oxide, and 5-7 parts of additives.

2. A bearing lubricating coating according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 43 parts of polyimide, 27 parts of polytetrafluoroethylene, 9 parts of nickel powder, 7 parts of magnesium oxide, 7 parts of aluminum oxide, and 6 parts of additives.

3. The bearing lubricating coating according to claim 1, characterized in that: The auxiliary agent is a mixture of zinc dialkyl dithiophosphate and tricresyl phosphate, and the mass ratio of the zinc dialkyl dithiophosphate to tricresyl phosphate is 1:

1.

4. A method for using the bearing lubricating coating according to claim 1, characterized in that: include: Add polytetrafluoroethylene, nickel powder, magnesium oxide and aluminum oxide powder into the polyimide solution and mix well; Adding additives and mixing evenly to obtain bearing lubricating fluid; spraying the bearing lubricating fluid onto the bearing surface using a spray gun; The bearing lubricating liquid on the bearing surface is dried to form a bearing lubricating coating on the bearing surface.

5. The method for using a bearing lubricating coating according to claim 4, characterized in that: Before applying bearing lubricant, the bearing surface is heat treated. The heat treatment includes: Heat the bearing surface to 900-970℃, keep it warm for 0.5-1h, then cool it down to 700-750℃ with the furnace, keep it warm for 6-8h, then cool it down to 600-630℃ with the furnace, then cool it down to room temperature with the furnace after keeping it warm for 5-8h.

6. The method for using a bearing lubricating coating according to claim 4, characterized in that: Before applying bearing lubricant, the bearing surface is pretreated. The pretreatment includes: The surface of the bearing to be coated is polished with sandpaper, the bearing surface is ultrasonically cleaned with an isoparaffin cleaning agent, and the bearing surface is blown dry after cleaning.

7. The method for using a bearing lubricating coating according to claim 4, characterized in that: When spraying bearing lubricant with a spray gun, the temperature of the bearing surface is maintained at 80-120°C.

8. The method for using a bearing lubricating coating according to claim 4, characterized in that: The thickness of the bearing lubricating coating is 22 to 50 microns.

9. The method for using a bearing lubricating coating according to claim 4, characterized in that: When spraying the bearing lubricant with a spray gun, the bearing surface temperature, the spraying speed of the spray gun, and the flow rate of the spray gun are controlled to ensure that the bearing lubricant dries and forms a film within 5 to 10 seconds after spraying.

10. The method for using a bearing lubricating coating according to claim 4, characterized in that: Drying the bearing lubricating fluid on the bearing surface comprises: After spraying, the bearing surface is heated to 180-200℃ and kept warm for one hour, then heated to 230-250℃ and kept warm for one hour, then heated to 280-300℃ and kept warm for one hour, and then cooled to room temperature.

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