A plain bearing, a method of production and a device comprising the plain bearing

Abstract

The application discloses a kind of knuckle bearing, preparation method and the equipment comprising the knuckle bearing. The knuckle bearing includes inner ring and outer ring, inner ring is installed in the inside of outer ring;The inner ring includes inner ring matrix and ceramic coating, the surface of the outer ring is coated with the ceramic coating towards the inner ring matrix;In the gap of the inner and outer rings of the knuckle bearing, fill lubricating layer, the lubricating layer is heat-conducting-lubricating dual-function composite resin;The heat-conducting-lubricating dual-function composite resin includes thermosetting resin matrix, modified filler and heat-conducting-lubricating dual-function microcapsule;The core material of the heat-conducting-lubricating dual-function microcapsule includes nano metal particles and lubricating oil, and shell material is resin.The bearing inner ring of knuckle bearing is ceramized, and at the same time, fill heat-conducting-lubricating dual-function composite resin as lubricating layer in the gap in the inner and outer rings of knuckle bearing, to enhance its wear resistance, heat resistance, so as to improve service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of joint bearings, in particular to a joint bearing, a preparation method and a device comprising the joint bearing. BACKGROUND

[0002] A joint bearing is a kind of spherical sliding bearing, whose sliding contact surface is an inner spherical surface and an outer spherical surface, which can rotate and swing at any angle during movement, and has the advantages of large load carrying capacity, self-aligning, good lubrication, etc., but under extreme working conditions, i.e. high temperature and long service life, the inner ring steel and lubricating material are prone to wear and tear after long time movement, which may cause large wear and failure. SUMMARY

[0003] The purpose of the present application is to provide a joint bearing, a preparation method and a device comprising the joint bearing. The present application ceramizes the bearing inner ring of the joint bearing, and fills a heat-conducting and lubricating dual-functional composite resin as a lubricating layer in the gap between the inner and outer rings of the joint bearing, so as to enhance its wear resistance and heat resistance, thereby improving the service life.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] In one aspect, the present application provides a joint bearing, comprising an inner ring and an outer ring, the inner ring being installed inside the outer ring; the inner ring comprises an inner ring base body and a ceramic coating, and the surface of the inner ring base body towards the outer ring is coated with the ceramic coating;

[0006] A lubricating layer is filled in the gap between the inner and outer rings of the joint bearing, and the lubricating layer is a heat-conducting and lubricating dual-functional composite resin;

[0007] The heat-conducting and lubricating dual-functional composite resin comprises a thermosetting resin base body, a modified filler and a heat-conducting and lubricating dual-functional microcapsule; the mass percentage of the modified filler in the thermosetting resin base body is 0.1% to 50%, preferably 1% to 20%, and more preferably 4% to 10%; the mass percentage of the heat-conducting and lubricating dual-functional microcapsule is 0.1% to 50%, preferably 10% to 50%, and more preferably 20% to 40%;

[0008] The core material of the heat-conducting and lubricating dual-functional microcapsule comprises nano metal particles and lubricating oil, and the shell material is resin;

[0009] In the heat-conducting and lubricating dual-functional microcapsule, the mass percentage of the nano metal particles is 1% to 10%, preferably 1% to 9%, and more preferably 3% to 9%; the mass percentage of the lubricating oil is 10% to 20%, and the rest is the shell material of resin.

[0010] Due to the introduction of the ceramic coating of the inner ring, the wear resistance and service life of the joint bearing are greatly improved, and due to the high temperature resistance of the ceramic material, the service temperature of the joint bearing can be improved, and the heat-conducting and lubricating dual-functional composite resin is used as the lubricating layer to improve the high temperature resistance of the lubricating layer, so that the high temperature working condition of the joint bearing can be realized.

[0011] According to the joint bearing of the application, preferably, a stripe texture is formed on the surface of the inner ring base body to enhance the bonding property of the ceramic coating and the inner ring base body. More preferably, the width of the stripe texture is 2-10 μm, preferably 3-6 μm; the depth of the stripe texture is 1-5 μm, preferably 2-4 μm. The stripe texture can be arranged in parallel or cross arrangement to form various patterns, such as rhombus, plum blossom, etc.

[0012] According to the joint bearing of the application, preferably, the ceramic coating is selected from, but not limited to, an alumina ceramic coating, a zirconia ceramic coating, a chromium oxide ceramic coating, a silicon carbide ceramic coating, a KN17 polymer ceramic polymer coating or a KN high temperature ceramic coating.

[0013] According to the joint bearing of the application, preferably, the thickness of the ceramic coating is 10-1000 μm (such as 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm).

[0014] The application uses the heat-conducting and lubricating dual-functional composite resin as the lubricating layer, and the microcapsules in the composite resin have the heat-conducting and lubricating dual-function, which can enhance the wear resistance and heat resistance, thereby improving the service life.

[0015] Regarding the heat-conducting and lubricating dual-functional composite resin, preferably, in the heat-conducting and lubricating dual-functional composite resin, the mass percentage of the nano metal particles in the mass of the thermosetting resin base body is 0.001%-5%, more preferably 0.1%-5%, and further preferably 1%-4%.

[0016] Regarding the heat-conducting and lubricating dual-functional composite resin, preferably, the core material of the heat-conducting and lubricating dual-functional microcapsule further comprises lubricating particles.

[0017] In the heat-conducting and lubricating dual-functional microcapsule, the mass percentage of the lubricating particles is 10%-30%, more preferably 25%-30%.

[0018] Regarding the thermally conductive-lubricating bifunctional composite resin, preferably, the core material of the thermally conductive-lubricating bifunctional microcapsule further includes fibers;

[0019] In the thermally conductive and lubricating dual-function microcapsule, the fiber accounts for 10% to 20% of the total mass.

[0020] Regarding the thermally conductive and lubricating dual-function composite resin, preferably, the shell material is made of at least one of epoxy resin, phenolic resin, unsaturated polyester resin, melamine-formaldehyde resin, urea-formaldehyde resin, polyurethane, and polyimide.

[0021] Regarding the thermally conductive and lubricating dual-function composite resin, the addition of the aforementioned nano-metal particles can effectively improve the resin's thermal conductivity. Preferably, the nano-metal particles are selected from at least one of nano-silver powder, nano-copper powder, nano-molybdenum powder, nano-aluminum powder, nano-iron powder, nano-cobalt powder, and nano-nickel powder.

[0022] Regarding the thermally conductive-lubricating dual-function composite resin, preferably, the nano-metal particles are selected from at least one of nano-iron powder, nano-cobalt powder, nano-nickel powder, and other nano-metal particles with electromagnetic properties. Since these nano-metal particles also possess electromagnetic properties, the position of the microcapsules in the composite resin can be further controlled by using an electromagnetic field, thereby improving the heat dissipation rate in high-temperature localized areas. More preferably, in the lubrication layer, the nano-metal particles are distributed in a portion of it; that is, the nano-metal particles with electromagnetic properties are distributed in a localized area of ​​the thermally conductive-lubricating dual-function composite resin. Specifically, the position of the microcapsules in the composite resin can be controlled by using an electromagnetic field, thereby improving the heat dissipation rate in high-temperature localized areas.

[0023] Regarding the thermally conductive and lubricating dual-functional composite resin, the lubricating particles exhibit excellent lubrication properties. Preferably, the lubricating particles are selected from at least one of graphene, carbon nanotubes, polytetrafluoroethylene nanoparticles, graphite, and molybdenum disulfide.

[0024] Regarding the thermally conductive and lubricating dual-functional composite resin, the fiber enhances mechanical properties and improves compressive strength. Preferably, the fiber is selected from at least one of carbon fiber, glass fiber, and basalt fiber.

[0025] Regarding the thermally conductive-lubricating dual-function composite resin, preferably, the thermosetting resin matrix is ​​selected from at least one of epoxy resin, phenolic resin, unsaturated polyester resin, melamine-formaldehyde resin, urea-formaldehyde resin, polyurethane, and polyimide.

[0026] Regarding the heat-conducting and lubricating dual-functional composite resin, preferably, the modified filler is at least one of calcium carbonate, clay, kaolin, talcum powder, mica, carbon black, calcium sulfate, calcium sulfite, carbon fiber, glass fiber, silicon dioxide, graphene, carbon nanotube, polytetrafluoroethylene nanoparticle, graphite, molybdenum disulfide, boron nitride, zirconium oxide. Adding the modified filler in the thermosetting resin matrix can help improve the strength, toughness and wear resistance of the resin. Specifically, if the modified filler is at least one of talcum powder, mica, carbon black, calcium sulfate, calcium sulfite, metal powder, molybdenum disulfide, boron nitride, zirconium oxide and polytetrafluoroethylene nanoparticle, the wear resistance of the resin can be improved well, and if the modified filler is at least one of calcium carbonate, clay, kaolin, carbon fiber, glass fiber, silicon dioxide, graphene and carbon nanotube, the strength and toughness of the resin can be improved well, thereby improving the performance and reliability of the resin.

[0027] The heat-conducting and lubricating dual-functional composite resin used in the application has a dense structure and no defects such as cracks and holes, and the heat-conducting performance is greatly improved without affecting the mechanical properties and tribological properties; further, nano metal particles with electromagnetic properties such as nano iron powder, nano cobalt powder and nano nickel powder can be used to realize directional regulation of the position of the microcapsule in the composite resin by means of electromagnetic field, thereby improving the heat dissipation rate of the local high-temperature area.

[0028] In another aspect, the application provides a preparation method of the above knuckle bearing, comprising the following steps:

[0029] Spraying the ceramic coating on the inner ring base of the knuckle bearing;

[0030] Assembling the inner ring and the outer ring;

[0031] Mixing the thermosetting resin matrix, the modified filler and the heat-conducting and lubricating dual-functional microcapsule to obtain a mixed raw material; after vacuumizing treatment, the mixed raw material is injected into the gap between the inner and outer rings of the knuckle bearing; then the gap is vacuumized and solidified to form the lubricating layer.

[0032] According to the preparation method of the application, preferably, a stripe texture is formed on the inner ring base of the knuckle bearing by laser, and then the ceramic coating is sprayed.

[0033] According to the preparation method of the application, preferably, the ceramic coating is sprayed by arc spraying, plasma spraying, supersonic spraying, subsonic spraying or composite spraying.

[0034] According to the preparation method of the present application, preferably, the process for preparing the ceramic coating includes the following steps: oil removal by baking, protection treatment, surface sand blasting, cleaning treatment, product preheating, thermal primer spraying, primer baking, thermal topcoat spraying, high-temperature baking, repeated spraying, high-temperature curing, sintering cooling, waiting for cooling, surface inspection, performance inspection, removal of protection, surface cleaning, product coating, and the like.

[0035] According to the preparation method of the present application, preferably, the preparation temperature of the ceramic coating is 200-1000℃ (for example, the use temperature is 200℃, 300℃, 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, or 1000℃).

[0036] According to the preparation method of the present application, preferably, the width of the gap is 1-10 mm.

[0037] According to the preparation method of the present application, preferably, the mass fraction of the heat-conducting and lubricating dual-functional microcapsule based on the thermosetting resin matrix is 0.1%-50%, preferably 10%-50%, and more preferably 20%-40%.

[0038] According to the preparation method of the present application, preferably, the mass fraction of the modified filler based on the thermosetting resin matrix is 0.1%-50%, preferably 1%-20%, and more preferably 4%-10%.

[0039] According to the preparation method of the present application, preferably, the mass fraction of the nano metal particle based on the thermosetting resin matrix is 0.001%-5%, more preferably 0.1%-5%, and further preferably 1%-4%.

[0040] According to the preparation method of the present application, preferably, the vacuum degree of the vacuumizing treatment is -0.09 MPa to -0.1 MPa.

[0041] According to the preparation method of the present application, preferably, the temperature of the curing treatment is 40-300℃, and more preferably 80-220℃.

[0042] According to the preparation method of the present application, preferably, the heat-conducting and lubricating dual-functional microcapsule is synthesized by a solvent evaporation method. More preferably, the synthesis of the heat-conducting and lubricating dual-functional microcapsule includes the following steps:

[0043] The shell material and the core material are added to a solvent, and after the shell material solvent forms a stable system, the solvent is removed, and the shell material is coated on the core material. After washing and drying, the microcapsule is obtained.

[0044] The reaction conditions of the solvent evaporation method are relatively mild, the solvent can be recycled and reused, resource waste is reduced, and the reaction system is relatively stable.

[0045] According to the preparation method of the present application, preferably, the solvent is selected from water, ethanol, acetone and the like.

[0046] In another aspect of the present application, a device comprising the above-mentioned knuckle bearing is provided, such as high-end equipment, long-service equipment, precision instruments, aviation components and the like. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 A schematic diagram of the stripe texture and ceramic coating on the inner ring surface of the knuckle bearing of the present application.

[0048] Figure 2 A schematic diagram of the structure of the heat-conducting and lubricating dual-functional microcapsule used in the present application.

[0049] Figure 3 A flow chart for preparing the ceramic coating of the bearing inner ring.

[0050] Figure 4 A graph of the friction coefficient of the composite resin material in Example 1, Example 3 and Comparative Example 1.

[0051] Figure 5 A morphology diagram of basalt fibers dispersed in an ethanol solution.

[0052] Figure 6 A torque test graph of the knuckle bearing obtained in Example 2.

[0053] Figure 7 A wear rate test graph of the knuckle bearing obtained in Example 2. DETAILED DESCRIPTION

[0054] In order to more clearly illustrate the present application, the present application will be further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the specific descriptions below are illustrative and not limiting, and should not limit the scope of protection of the present application.

[0055] The present application ceramizes the bearing inner ring of the knuckle bearing, and fills the gap between the inner and outer rings of the knuckle bearing with a heat-conducting and lubricating dual-functional composite resin as a lubricating layer, so as to enhance the wear resistance and heat resistance, thereby improving the service life.

[0056] The knuckle bearing provided by the present application has a ceramic coating on the surface of the inner ring substrate, and a lubricating layer filled in the gap between the inner and outer rings, wherein the lubricating layer is a heat-conducting and lubricating dual-functional composite resin; the heat-conducting and lubricating dual-functional composite resin comprises a thermosetting resin matrix, a modified filler and a heat-conducting and lubricating dual-functional microcapsule; the core material of the heat-conducting and lubricating dual-functional microcapsule comprises nano metal particles and lubricating oil, and the shell material is resin.

[0057] Due to the introduction of the ceramic coating of the inner ring, the wear resistance and service life of the joint bearing are greatly improved, and due to the high temperature resistance of the ceramic material, the service temperature of the joint bearing can be improved, and the high temperature working condition of the joint bearing can be realized by using the heat-conducting and lubricating dual-functional composite resin as the lubricating layer to improve the high temperature resistance of the lubricating layer.

[0058] The preparation method of the joint bearing provided by the application comprises the following steps:

[0059] Spraying the ceramic coating on the inner ring base of the joint bearing;

[0060] Assembling the inner ring and the outer ring;

[0061] Mixing the thermosetting resin base, the modified filler and the heat-conducting and lubricating dual-functional microcapsule to obtain a mixed raw material; after vacuumizing treatment of the mixed raw material, the mixed raw material is injected into the gap between the inner ring and the outer ring of the joint bearing; then the gap is vacuumized and solidified to form the lubricating layer.

[0062] In a preferred embodiment, the preparation method of the joint bearing comprises the following steps:

[0063] Step 1: forming a stripe texture on the inner ring base of the joint bearing by laser to enhance the bonding property of the ceramic coating and the inner ring base; as shown in Figure 1 .

[0064] The width of the stripe texture is preferably 2-10 μm, and more preferably 3-6 μm; the depth of the stripe texture is preferably 1-5 μm, and more preferably 2-4 μm.

[0065] Step 2: spraying the ceramic coating on the inner ring base of the joint bearing.

[0066] The ceramic coating can be sprayed by electric arc spraying, plasma spraying, supersonic spraying, subsonic spraying or composite spraying. The ceramic coating is preferably selected from, but not limited to, an alumina ceramic coating, a zirconia ceramic coating, a chromium oxide ceramic coating, a silicon carbide ceramic coating, a KN17 polymer ceramic polymer coating or a KN high temperature ceramic coating. The thickness of the ceramic coating is preferably 10-1000 μm (for example, the thickness of the coating is 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm).

[0067] As shown in Figure 3As shown, the process for preparing the ceramic coating preferably includes the following processes: first, oil removal by baking, protection treatment, surface sand blasting, cleaning treatment, product preheating, thermal primer spraying, primer baking, thermal topcoat spraying, high-temperature baking, repeated spraying, high-temperature curing, sintering cooling, waiting for cooling, surface inspection, performance inspection, removal of protection, surface cleaning, product coating, and the like. The preparation temperature of the ceramic coating is preferably 200-1000°C (for example, the use temperature is 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, or 1000°C).

[0068] Step 3: Assembling the inner ring and the outer ring of the knuckle bearing.

[0069] Step 4: Mixing the thermosetting resin matrix, the modified filler, and the heat-conducting and lubricating dual-functional microcapsules to obtain a mixed raw material; after vacuumizing the mixed raw material, injecting the mixed raw material into the gap between the inner ring and the outer ring of the knuckle bearing; then vacuumizing the gap and solidifying the gap to form the lubricating layer.

[0070] Preferably, the heat-conducting and lubricating dual-functional microcapsules are prepared by a solvent evaporation method. The shell material and the core material are first added to a solvent, the shell material is required to be dissolved in the solvent to form a stable system, then the solvent is removed, and the wall material is coated on the core material. After washing and drying, the microcapsules are obtained. This method has relatively mild reaction conditions, the solvent can be recycled and reused, reducing resource waste, and the reaction system is relatively stable.

[0071] According to the embodiments of the present application, the thermosetting resin matrix is selected from at least one of an epoxy resin, a phenolic resin, an unsaturated polyester resin, a melamine-formaldehyde resin, a urea-formaldehyde resin, a polyurethane, and a polyimide. The above-mentioned thermosetting resins can all be prepared into composite resin materials with good heat conductivity and no hollow defects by the preparation method of the present application. Therefore, the preparation method of the present application can be applied to most thermosetting resins and even thermoplastic resins, and has a large application range.

[0072] According to an embodiment of the present application, the modified filler is at least one of calcium carbonate, clay, kaolin, talcum powder, mica, carbon black, calcium sulfate, calcium sulfite, carbon fiber, glass fiber, silicon dioxide, graphene, carbon nanotube, polytetrafluoroethylene nanoparticles, graphite, molybdenum disulfide, boron nitride, zirconium oxide. The above modified filler can help to improve the strength, toughness and wear resistance of the resin. Specifically, if the modified filler is at least one of talcum powder, mica, carbon black, calcium sulfate, calcium sulfite, metal powder, molybdenum disulfide, boron nitride, zirconium oxide and polytetrafluoroethylene nanoparticles, the wear resistance of the resin can be improved well, and if the modified filler is at least one of calcium carbonate, clay, kaolin, carbon fiber, glass fiber, silicon dioxide, graphene and carbon nanotube, the strength and toughness of the resin can be improved well at the same time, thereby improving the performance and reliability of the resin.

[0073] According to an embodiment of the present application, the mass percentage of the heat-conducting and lubricating dual-functional microcapsule in the thermosetting resin matrix is 0.1% to 50%, preferably 10% to 50%, and more preferably 20% to 40%.

[0074] According to an embodiment of the present application, the mass percentage of the modified filler in the thermosetting resin matrix is 0.1% to 50%, preferably 1% to 20%, and more preferably 4% to 10%. Thus, the skilled person in the art can flexibly set the mass percentage of the modified filler according to the requirements for the strength and toughness of the resin and the specific material of the modified filler, etc. as long as the good use performance of the resin is ensured. For example, in some embodiments below, the mass percentage of the modified filler is 4.5% and 9%.

[0075] According to an embodiment of the present application, the nano-metal particles in the microcapsule are at least one of nano-silver powder, nano-copper powder, nano-molybdenum powder, nano-aluminum powder, nano-iron powder, nano-cobalt powder, nano-nickel powder. The added metal nanoparticles can effectively improve the heat conduction performance of the resin. More preferably, the nano-metal particles are at least one of nano-iron powder, nano-cobalt powder, nano-nickel powder and other nano-metal particles with electromagnetic properties; since these nano-metal particles also have electromagnetic properties, the position of the microcapsule in the composite material can be further controlled by electromagnetic field, thereby improving the heat dissipation rate of the local high temperature area.

[0076] According to an embodiment of the present application, the mass percentage of the nano-metal particles in the thermosetting resin matrix is 0.001% to 5%, more preferably 0.1% to 5%, and further preferably 1% to 4%.

[0077] According to embodiments of the present invention, the stirring rate is 10~500 r / min, for example 10 r / min, 50 r / min, 100 r / min, 150 r / min, 200 r / min, 250 r / min, 300 r / min, 350 r / min, 400 r / min, 450 r / min, 500 r / min, etc. Therefore, under the above stirring rate conditions, the thermosetting resin matrix and the modified filler can be quickly and uniformly mixed. In some embodiments, the mixed raw materials may further include at least one of an initiator and a curing agent. This is beneficial for further improving the resin performance; the initiator and curing agent are specifically selected according to different thermosetting resin matrices; in the mixed raw materials, the mass percentage of both the initiator and the curing agent is 0.1%~2%.

[0078] Vacuuming the mixed raw materials removes gases and water molecules, allowing for more thorough mixing. The vacuum level is preferably between -0.09 MPa and -0.1 MPa. This maximizes the removal of gases and water molecules from the mixed raw materials.

[0079] The width of the slit is preferably 1-10 mm. The curing temperature is preferably 40-300°C, for example, curing temperatures of 40°C, 60°C, 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, 200°C, 300°C, etc. In some embodiments, the curing temperature can be 80-220°C. Thus, within the above temperature range, cured resin can be obtained quickly and effectively.

[0080] The composite resin prepared by step 4 above includes a thermosetting resin matrix, modified fillers, and thermally conductive-lubricating bifunctional microcapsules; the thermally conductive-lubricating bifunctional microcapsules are as follows: Figure 2 As shown, this is a core-shell structure. The core material includes nano-metal particles and lubricating oil, and may further include fibers, lubricating particles, etc.; the outer shell material is resin. The composite resin structure is dense and free of defects such as cracks and pores, and its thermal conductivity is significantly improved without affecting the mechanical and tribological properties of the resin. Furthermore, nano-metal particles with electromagnetic properties, such as nano-iron powder, nano-cobalt powder, and nano-nickel powder, can be further optimized to achieve directional control of the microcapsule's position in the composite material through electromagnetic fields, thereby improving the heat dissipation rate in high-temperature local areas.

[0081] The following specific embodiments further illustrate the technical solution of the present invention:

[0082] Example 1

[0083] This embodiment describes the preparation of a spherical plain bearing, including the following steps:

[0084] 1) A stripe texture with a width of 4 μm and a depth of 2 μm is formed on the outer surface of the inner ring of the bearing by means of laser.

[0085] 2) The h-BN ceramic coating is applied to the steel substrate of the bearing inner ring by arc spraying and plasma spraying.

[0086] 3) Preparation of thermally conductive and lubricating bifunctional microcapsules (containing 1g Ag nanoparticles and 3g PTFE nanoparticles):

[0087] 1 g Ag nanoparticles, 3 g PTFE nanoparticles (lubricating particles), 2 g lubricating oil PAO6 and 4 g 901 unsaturated polyester resin monomer were weighed using an electronic balance and mixed as the dispersed phase (i.e., oil phase) for later use.

[0088] Disperse 0.5 g of surfactant SDS in 90 mL of deionized water as a continuous phase (i.e., aqueous phase), and wait for it to dissolve completely before use;

[0089] The two solutions were added dropwise into a three-necked flask and stirred magnetically. The mixture was reacted at 80°C for 4 hours to form a homogeneous solution. After the reaction was complete, the solution was filtered and washed with deionized water, and then freeze-dried for 48 hours to obtain capsule powder.

[0090] 4) Add 100 g of 901 unsaturated polyester resin, 2.5 g of carbon fiber, and 2 g of silicon dioxide to a 250 mL beaker. Add 1 g of curing agent methyl ethyl ketone peroxide, 0.5 g of catalyst cobalt stearate, and 20 g of microcapsules (containing 2 g of Ag nanoparticles and 6 g of PTFE nanoparticles). Stir well to obtain the mixed raw materials.

[0091] 5) The mixed raw materials are subjected to vacuum treatment to obtain a pretreated raw material mixture; the pretreated raw material mixture is injected into the gap between the inner and outer rings of the bearing; wherein the vacuum degree after vacuum treatment is -0.99MPa; the gap filled with the pretreated raw material mixture is subjected to vacuum treatment and cured to form a lubricating layer at a curing temperature of 100℃, which is recorded as composite resin sample 1. The thermal conductivity of the composite resin sample is tested, and the results are shown in Table 2.

[0092] The final product is a spherical plain bearing with a steel inner ring coated with h-BN ceramic and a composite resin lubrication layer.

[0093] Example 2

[0094] This embodiment describes the preparation of a spherical plain bearing, including the following steps:

[0095] 1) A stripe texture with a width of 4 μm and a depth of 2 μm is formed on the outer surface of the inner ring of the bearing by means of laser.

[0096] 2) The ZrO2 ceramic coating is applied to the steel substrate of the bearing inner ring by arc spraying and subsonic spraying.

[0097] 3) Preparation of thermally conductive and lubricating bifunctional microcapsules (containing 1 g Cu nanoparticles and 3 g PTFE nanoparticles):

[0098] Referring to the microcapsule preparation process in Example 1, the Ag nanoparticles were replaced with Cu nanoparticles.

[0099] 4) Add 100 g of 901 unsaturated polyester resin, 2.5 g of carbon fiber, 2 g of silica, 1 g of curing agent, 0.5 g of catalyst, and 10 g of microcapsules (containing 2 g of Cu nanoparticles and 6 g of PTFE nanoparticles) to a 250 mL beaker, stir until homogeneous, and obtain a mixed raw material; subject the mixed raw material to vacuum treatment to obtain a pretreated raw material mixture; inject the pretreated raw material mixture into the gap between the inner and outer rings of the bearing; wherein, the vacuum degree after vacuum treatment is -0.99 MPa; subject the gap filled with the pretreated raw material mixture to vacuum treatment and cure treatment to form a lubricating layer, the curing temperature is 100℃, and this is recorded as composite resin sample 2. The thermal conductivity of the composite resin sample is tested, and the results are shown in Table 2.

[0100] The final product is a spherical plain bearing with a steel inner ring coated with ZrO2 ceramic and a composite resin lubrication layer.

[0101] Figure 6 and Figure 7 The test results for the spherical bearing in this embodiment show that during the first 20,000 seconds of testing, the torque and surface friction coefficient decreased significantly due to the ceramic coating. During the first 20,000 seconds of testing, the torque decreased significantly, and by the 20,000th second of testing, the wear rate decreased by 0.1%.

[0102] Example 3

[0103] This embodiment describes the preparation of a spherical plain bearing, including the following steps:

[0104] 1) A stripe texture with a width of 4 μm and a depth of 2 μm is formed on the outer surface of the inner ring of the bearing by means of laser.

[0105] 2) The Al2O3 ceramic coating is sprayed onto the steel substrate of the bearing inner ring by arc spraying and plasma spraying.

[0106] 3) Preparation of thermally conductive and lubricating bifunctional microcapsules (containing 1 g Mo nanoparticles and 3 g PTFE nanoparticles):

[0107] Referring to the microcapsule preparation process in Example 1, the Ag nanoparticles were replaced with Mo nanoparticles.

[0108] 4) Add 50 g of 901 unsaturated polyester resin, 2.5 g of carbon fiber, 2 g of silica, 1 g of curing agent, 0.5 g of catalyst, and 10 g of microcapsules (containing 2 g of Mo nanoparticles and 6 g of PTFE nanoparticles) to a 250 mL beaker, stir well to obtain a mixed raw material; subject the mixed raw material to vacuum treatment to obtain a pretreated raw material mixture.

[0109] 5) The pretreated raw material mixture is injected into the gap between the inner and outer rings of the bearing; wherein the vacuum degree after vacuum treatment is -0.99MPa; the gap filled with the pretreated raw material mixture is vacuumed and cured to form a lubricating layer at a curing temperature of 100℃, and is recorded as composite resin sample 3. The thermal conductivity of the composite resin sample is tested, and the results are shown in Table 2.

[0110] The final product is a spherical plain bearing with a steel inner ring coated with an Al2O3 ceramic and a composite resin lubrication layer.

[0111] Example 4

[0112] This embodiment describes the preparation of a spherical plain bearing, including the following steps:

[0113] 1) A stripe texture with a width of 4 μm and a depth of 2 μm is formed on the outer surface of the inner ring of the bearing by means of laser.

[0114] 2) Apply Si3N4 ceramic coating to the bearing inner ring steel substrate by arc spraying and plasma spraying.

[0115] 3) Preparation of thermally conductive and lubricating bifunctional microcapsules (containing 1 g Fe nanoparticles and 3 g PTFE nanoparticles):

[0116] Referring to the microcapsule preparation process in Example 1, the Ag nanoparticles were replaced with Fe nanoparticles.

[0117] 4) Add 50 g of 901 unsaturated polyester resin, 2.5 g of carbon fiber, 2 g of silica, 1 g of curing agent, 0.5 g of catalyst, and 10 g of microcapsules (containing 2 g of Fe nanoparticles and 6 g of PTFE nanoparticles) to a 250 mL beaker, stir well to obtain the mixed raw materials.

[0118] 5) The mixed raw materials are subjected to vacuum treatment to obtain a pretreated raw material mixture; the pretreated raw material mixture is injected into the gap between the inner and outer rings of the bearing; wherein the vacuum degree after vacuum treatment is -0.99MPa; the gap filled with the pretreated raw material mixture is subjected to vacuum treatment and cured to form a lubricating layer at a curing temperature of 100℃, which is recorded as composite resin sample 4. The thermal conductivity of the composite resin sample is tested, and the results are shown in Table 2.

[0119] The final product is a spherical plain bearing with a steel inner ring coated with Si3N4 ceramic and a composite resin lubrication layer.

[0120] Comparative Example 1

[0121] Add 50 g of 901 unsaturated polyester resin, 2.5 g of carbon fiber, 6 g of PTFE nanoparticles, and 2 g of silica to a 250 mL beaker. Add 1 g of curing agent and 0.5 g of catalyst, without adding microcapsules. Stir until homogeneous to obtain a mixed raw material. Vacuum the mixed raw material to obtain a pretreated raw material mixture. Pour the pretreated raw material mixture into the molding space and fill the gaps. The vacuum degree after vacuum treatment is -0.99 MPa. Vacuum the gaps filled with the pretreated raw material mixture and cure it at 100℃. This is recorded as composite resin control sample 1. The thermal conductivity of the composite resin sample is tested, and the results are shown in Table 2.

[0122] The inner ring of the bearing is not treated in any way; it is made of special steel.

[0123] Table 1 shows the raw materials used in each embodiment and comparative example and their proportions, and Table 2 shows the thermal conductivity of the composite resin materials obtained in the embodiments and comparative examples.

[0124] Table 1 Actual proportions of composite resin materials in the examples

[0125]

[0126] Table 2 Thermal conductivity of composite resin materials in the examples and comparative examples

[0127]

[0128] The thermal conductivity in Table 2 was determined using a thermal conductivity meter. The results show that the thermal conductivity of the composite resin with added microcapsules in the examples is significantly better than that of the control example without added microcapsules.

[0129] Figure 4 The graphs show the friction coefficients of the composite resin materials in Examples 1, 3, and Comparative Example 1. The friction coefficients were determined using a PLAINT friction and wear testing machine. Figure 4The results show that the coefficient of friction did not increase significantly after the addition of metal particles, while the thermal conductivity and other properties in Table 2 increased significantly, proving that the thermal conductivity was enhanced without affecting other properties.

[0130] Example 5

[0131] The difference between this embodiment and Example 4 is that, in the preparation of the microcapsules, 2 g of basalt fiber was added to the dispersed phase (i.e., the oil phase) to further increase the strength.

[0132] Basalt fibers dispersed in an ethanol solution have the following morphology: Figure 5 As shown, its morphology reveals cross-linked fine fibers interspersed with various mineral particles.

[0133] The composite resin obtained by adding basalt fiber has a thermal conductivity of 2.425 W / (m·K) and a friction coefficient of 0.07~0.11.

[0134] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A knuckle bearing comprising an inner ring and an outer ring, the inner ring being mounted inside the outer ring; characterized in that, The inner ring comprises an inner ring base and a ceramic coating, and the ceramic coating is coated on the surface of the inner ring base towards the outer ring; A lubricating layer is filled in the gap between the inner and outer rings of the joint bearing, and the lubricating layer is a heat-conducting and lubricating dual-functional composite resin; The heat-conducting and lubricating dual-functional composite resin comprises a thermosetting resin base, 4-10% of modified fillers and 20-40% of heat-conducting and lubricating dual-functional microcapsules, with the mass of the thermosetting resin base being 100%; The core material of the heat-conducting and lubricating dual-functional microcapsules comprises nano metal particles and lubricating oil, and the shell material is resin, and the resin is at least one of epoxy resin, phenolic resin, unsaturated polyester resin, melamine-formaldehyde resin, urea-formaldehyde resin, polyurethane and polyimide; In the heat-conducting and lubricating dual-functional microcapsules, the mass percentage of the nano metal particles is 1-10%, the mass percentage of the lubricating oil is 10-20%, and the rest is the resin shell material.

2. The knuckle bearing according to claim 1, characterized in that The surface of the inner ring base is formed with a stripe texture.

3. The knuckle bearing of claim 1, wherein, The ceramic coating is selected from an alumina ceramic coating, a zirconia ceramic coating, a chromium oxide ceramic coating, a silicon carbide ceramic coating, a KN17 high polymer ceramic polymer coating or a KN high temperature ceramic coating.

4. The knuckle bearing of claim 1, wherein, The core material of the heat-conducting and lubricating dual-functional microcapsules further comprises lubricating particles; In the heat-conducting and lubricating dual-functional microcapsules, the mass percentage of the lubricating particles is 10-30%.

5. The knuckle bearing according to claim 1 or 4, characterized in that The core material of the heat-conducting and lubricating dual-functional microcapsules further comprises fibers; In the heat-conducting and lubricating dual-functional microcapsules, the mass percentage of the fibers is 10-20%.

6. The knuckle bearing of claim 1, wherein, The nano metal particles are at least one of nano silver powder, nano copper powder, nano molybdenum powder, nano aluminum powder, nano iron powder, nano cobalt powder and nano nickel powder.

7. The knuckle bearing of claim 6, wherein, In the lubricating layer, the nano metal particles are distributed in a part thereof.

8. The knuckle bearing of claim 4, wherein, The lubricating particles are at least one of graphene, carbon nanotube, polytetrafluoroethylene nanoparticles, graphite and molybdenum disulfide.

9. The knuckle bearing of claim 5, wherein, The fibers are at least one of carbon fiber, glass fiber and basalt fiber.

10. The bearing of claim 1, wherein, The thermosetting resin base is at least one of epoxy resin, phenolic resin, unsaturated polyester resin, melamine-formaldehyde resin, urea-formaldehyde resin, polyurethane and polyimide.

11. The bearing of claim 1, wherein, The modified fillers are at least one of calcium carbonate, clay, kaolin, talc, mica, carbon black, calcium sulfate, calcium sulfite, carbon fiber, glass fiber, silicon dioxide, graphene, carbon nanotube, polytetrafluoroethylene nanoparticles, graphite, molybdenum disulfide, boron nitride and zirconium oxide.

12. A method of producing a plain bearing according to any one of claims 1 to 11, characterized in that The preparation method comprises the following steps: Spraying the ceramic coating on the inner ring base of the joint bearing; Assembling the inner ring and the outer ring; Mixing the thermosetting resin base, the modified fillers and the heat-conducting and lubricating dual-functional microcapsules to obtain a mixed raw material; vacuumizing the mixed raw material and then injecting it into the gap between the inner and outer rings of the joint bearing; then vacuumizing the gap and solidifying it to form the lubricating layer.

13. The method of claim 12, wherein, Forming a stripe texture on the inner ring base of the joint bearing by laser and then spraying the ceramic coating.

14. The method of claim 12, wherein, The ceramic coating is applied by means of arc spraying, plasma spraying, supersonic spraying, subsonic spraying or composite spraying.

15. An apparatus comprising the knuckle bearing of any of claims 1-11.

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