42results about How to "Excellent friction and wear properties" patented technology

A polyacetal resin composition which has improved friction-wear characteristics as compared with conventional polyacetal resin compositions and which is less restricted in counter sliding members and can conform to a wide range of friction-wear conditions. A polyacetal resin composition comprising 100 parts by weight of (A) a polyacetal resin, 0.1 to 10 parts by weight of (B) a polyethylene wax having a number average molecular weight of 500 to 15,000, 0.1 to 10 parts by weight of (C) a polyethylene resin having a number average molecular weight of 2×10⁴ to 50×10⁴, and 0.1 to 5 parts by weight of (D) a silicone oil having a kinetic viscosity at 25° C. of 50×10⁴ cSt or more.

The new processing technology of piston ring involves the processing technology of piston ring. It includes the following process steps: casting→grinding→heat treatment→grinding→gold processing→laser strengthening treatment→heat setting→gold processing. Since the surface layer of the piston ring is processed by laser alloying or laser cladding, and is rapidly melted by a high-energy laser beam, the matrix at a certain depth on the outer surface of the piston ring is rapidly melted and then solidified to form a specific ceramic particle reinforced composite coating. The coating and the piston ring body are metallurgical structures, which will not fall off or peel off under the action of external force. The invention is easy for industrial production, has excellent anti-adhesive wear and anti-abrasive wear capabilities, and has good product technical stability.

The invention belongs to the field of machining cutting tools, and relates to an AlNbCN multielement gradient composite coating tool and a preparing method thereof. The coating tool sequentially comprises a tool base body, a Ti transition layer, an AlNbC transition layer and an AlNbCN multielement gradient composite coating with the nitrogen content gradually changing in a gradient manner from interior to exterior, and the coating tool is prepared in a middle-frequency magnetron sputtering and arc plating composite coating method. According to the AlNbCN ultrahard carbohydrates and nitrogenous compound coating, due to the fact that the Al element and the Nb element are added in the coating at the same time, and the content of the nitrogen which is the structure component of the coating gradually changes in a gradient manner, thecutting machining performance of the tool can be improved. The AlNbCN multielement gradient composite coating tool has very high hardness and strength, low surface friction coefficient, good high-temperature oxidization preventing performance and excellent friction abrasion characters. In the cutting process, tool surface friction and cuttings bonding can be reduced through the tool, the cutting force and the cutting temperature can be reduced by 45% or above, the heat stability of the coating tool is improved by 65% or above, the service life of the tool is prolonged by 60% or above, and durability of the tool is improved by 60% or above.

The invention discloses a ZrCN nanometer composite membrane which is prepared through a double-target radio-frequency reactive sputtering method and uses stainless steel as a stratum base. The thickness of the ZrCN nanometer composite membrane is 1-3 micrometers, 7.2at.%<=C<=11.9at.%, atomic ratio of (C+N)/Zr is less than 1, C enters ZrN interstitial void to totally form interstitial solid solution, and the hardness of the ZrCN nanometer composite membrane is larger than or equal to 29GPa; or 13.2at.%<=C<=15.4at.%, atomic ratio of (C+N)/Zr is larger than 1, the remaining C (except for the part of C entering the ZrN interstitial void to totally form interstitial solid solution) forms amorphous CN or C elementary substance, and the hardness of the ZrNC nanometer composite membrane is larger than or equal to 18.5GPa.

The invention belongs to the field of mechanical manufacture cutting cutters, and in particular relates to a SiZrCN gradient composite coating cutter and preparation method thereof. The coating is the SiZrCN gradient composite coating prepared by adopting a composite coating method of unbalanced magnetron sputtering and electric arc plating; the surface of the coating cutter is SiZrCN gradient composite coating with gradually-changed gradient of nitrogen content, a Ti transition layer and a SiZrC transition layer are sequentially arranged between a cutter base body and the coating. By adopting the SiZrCN ultra-hard carbon-nitrogen compound coating, because two metals including Si and Zr are added in the coating at the same time, the nitrogen content of the coating structure component is gradually changed in a gradient manner, so that the cutting machining performance of the cutter can be improved. The coating has high hardness and heat stability, and also has good diffusion prevention and wear prevention performances, good plastic deformation resistance ability and excellent friction and wear resistance property. In the cutting process, the cutter can effectively prevent the occurrence of cracking of cutting edges and hot cracks, guarantee the machining surface quality of the workpieces, and prolong the service life of the cutter by more than 70%.

The invention discloses a copper-based dispersive bimetallic self-lubricating material and a method for preparing a self-lubricating base material. The method for preparing the base material comprises the following steps of: 1, mixing, namely mixing copper-based alloy powder and solid lubricant powder, wherein the solid lubricant powder comprises molybdenum disulfide and graphite, and the weight ratio of the copper-based alloy powder to the molybdenum disulfide to the graphite is (87-96):(0.5-3):(3-8); 2, spreading the powder, namely uniformly spreading the mixed powder on a metal plate; 3, loosely packing and sintering, namely heating and sintering the metal plate with spread powder at the temperature of between 650 and 1,000 DEG C under protective atmosphere; 4, rolling, namely rolling the metal plate in the step 3 into a semi-finished product; and 5, resintering, namely heating and sintering the semi-finished product at the temperature of between 650 and 1,000 DEG C under the protective atmosphere.

The invention discloses a method for preparing an ultrathin diamond carbon film by adopting a self-assembling organic monomolecular film as a modulating layer. By adopting an organic self-assembling monomolecular film as a transition layer, the ultrathin diamond film is prepared. The method has low cost and is easy for operation, and the prepared film has favorable friction and abrasion characteristics.

The invention discloses a drum-type friction plate prepared from a double-layer friction material, and a preparation method thereof. The drum-type friction plate comprises a base layer prepared from a base material, and a friction layer prepared from a friction material; the friction layer and the base layer are combined via hot press molding. The preparation method comprises following steps successively: prefabricated block preparation, hot press molding, heat treatment, and grinding and drilling. Beneficial effects are that: the friction layer possesses stable friction coefficient and excellent wear resistance; the base layer possesses high impact strength, compressive strength, and internal-shearing strength; welding spot effect of abrasive dust particle in the base material is achieved in premixed material hot press molding process so as to ensure bonding strength of the base material with a surface material; no requirement on the friction performance of the base material is proposed so as to reduce cost; waste dust and drilling cuttings generated in product production process are recycled effectively so as to reduce cost and improve the environment.

The invention belongs to the field of cutting tools used for mechanical manufacturing and relates to a TiMoCN gradient composite coated tool and a preparation method thereof. According to a coating of the coated tool, the TiMoCN gradient coated tool is prepared through a composite film coating method combining medium-frequency magnetron sputtering and electric arc plating. The coated tool comprises a tool base body, a Ti transitional layer, a TiMoC transitional layer and the TiMoCN gradient composite coating in sequence from inside to outside, wherein the nitrogen content of the TiMoCN gradient composite coating is gradually varied in a gradient manner. According to the TiMoCN superhard carbon nitride compound coating, two types of metal, namely Ti and Mo, are added to the coating at the same time, the content of nitrogen serving as a structural constitution of the coating is gradually varied in the gradient manner, and therefore cutting machining performance of the tool can be improved. The coated tool has the beneficial effects of being quite high in hardness and strength, low in surface friction coefficient, good in diffusion wear resistance and excellent in frictional wear resistance. In the cutting process, by means of the tool, friction and cutting chip bonding generated in the cutting process can be reduced; the cutting force can be reduced by 30% or above, and the cutting temperature can be lowered by 30% or above; and the service life of the tool can be prolonged by 50% or above, and durability can be improved by 50% or above.

The invention discloses a molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film and a preparation method and application thereof. The molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film comprises a titanium transition layer, a titanium/tantalum/molybdenum disulfide/tungsten disulfide multi-layer gradient transition layer and a molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped layer which are laminated in the thickness of the film in sequence. The preparation method comprises the step that a magnetron sputtering technology is adopted for depositing the titanium transition layer, the titanium/tantalum/molybdenum disulfide/tungsten disulfide multi-layer gradient transition layer and the molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped layer on the surface of a substrate in sequence to obtain the molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film. The molybdenum disulfide/tungsten disulfide multi-layer tantalum-doped thin film has good bonding strength with the substrate, rigidity and elasticity modulus, has good friction and wear resistance, good temperature self-adaptability,damp heat resistance and high-temperature-oxidation resistance at different temperatures in the atmospheric environment, and can meet the demands of aerospace crafts for stable lubrication and long service life.

The invention relates to the field of self-lubricating bearings, and in particular relates to a self-lubricating bearing filled with a solidified solid lubricating material and a preparation method thereof. A hole is pre-processed on a metal substrate, the hole is filled with a filler, after aging and curing treatment, the hole and the filler are combined into a whole as the self-lubricating bearing; the filler is prepared from the following components: 30%-35% of a binder, 50% to 60% of a solid lubricating material, and 10% to 15% of a curing agent. The filler is prepared into viscous paste at room temperature, filled into the hole of the self-lubricating bearing, allowed to stand at room temperature for more than 8 hours, placed in a vacuum drying oven, subjected to heat curing treatment, and then cooled to room temperature in a furnace. The solid lubricating material is firmly bonded in the hole of the substrate of the bearing, and the solid lubricating material has good uniformityand compactness. At high temperature of 400DEG C, the solid lubricating material can still be stable for a long time without melting or falling off in the hole of the substrate of the bearing.

The invention provides a preparation method for a wear-resistant noise-reducing composite material, which belongs to the field of material preparation. The preparation method is characterized by comprising the following steps: subjecting a composite lubrication system composed of a main lubricant, an assistant lubricant, a noise reducing agent, a friction reducing agent and other related auxiliary agents to uniform mixing via a high-speed mixer and then carrying out extrusion and granulation by using a double-screw extruder; and drying extruded particles and carrying out injection so as to obtain the wear-resistant noise-reducing composite material. The composite material prepared through improved process has excellent frictional wear characteristics, superior noise reduction performance, a high frictional property retention rate, good appearance and mechanical properties and good molding and processing performance; and the preparation method is simple, easy to operate and suitable for promotion and application in related fields.

The invention relates to a preparation method of a multi-element nano composite material suitable for lean oil working conditions. The method comprises the following steps: firstly, preparing hydrotalcite sheets and carbon nitride nanosheets; adding 0.1-10% by mass of hydrotalcite sheets and 0.1-10% by mass of carbon nitride nanosheets into 99.8%-80% by mass of epoxy resin, stirring and mixing for15 minutes under the conditions that the vacuum degree is -1 * 10 <5> Pa and the rotating speed is 1,000 r/min, adding a curing agent, and continuously mixing for 5 minutes at the rotating speed of 3,000 r/min to obtain mixed liquid; and finally, pouring the mixed liquid into a mold, and curing at 120 DEG C for 4-8 hours to obtain the self-lubricating composite material. The method is simple andfeasible, and the friction and wear resistance of the composite material can be improved.

The invention discloses a self-lubricating bionic texture guide rail device for an automobile production line switching platform. The device comprises a switching platform, at least two supporting guide rails, a plurality of self-lubricating guide rails and a plurality of supporting rollers carried by the switching platform. The supporting guide rails are arranged in parallel, the lower portions of the supporting rollers are located in the supporting guide rails, each supporting guide rail is at least provided with left and right supporting rollers, the self-lubricating guide rails are embedded in the bottoms of the supporting guide rails, the upper planes of the self-lubricating guide rails are flush with the lowest points of the supporting rollers, and each supporting guide rail is at least provided with left and right self-lubricating guide rails. According to the self-lubricating bionic texture guide rail device for the automobile production line switching platform, self lubricating of the supporting guide rails can be effectively achieved, meanwhile, the effect of capturing abrasive dust can be achieved, the friction and wear characteristics of the guide rails can be improved,switching platform work energy consumption is reduced, and production line work efficiency is improved.

A resin composition for a sliding member, comprises from 0.1 to less than 1.0% by weight of a fatty acid, 0.1 to 2.0% by weight of a metallic soap, 0.1 to 2.0% by weight of a phosphate, 0.3 to 2.0% by weight of a lubricating oil, and a polyester-based elastomer as the balance. A sliding member produced from such resin composition exhibits excellent friction and wear characteristics even at a low sliding speed under a high load.

Described herein are fluororesin compositions of melt processible fluororesin and wholly aromatic polyamide fibers. The wholly aromatic polyamide fibers have an average fiber diameter of 10-20 μm and an average fiber length of 100-1,000 μm. The compositions are melt processible and can be melt molded into sliding members having low wear when used with sliding counterparts made of metals such as aluminum, copper, zinc or nickel.

The present invention discloses a composite friction material, a brake lining and a brake lining production method. The composite friction material is divided into two layers along a thickness direction, wherein one layer uses a powder metallurgy friction material, and the other layer uses an organic friction material. According to the brake lining using the composite friction material, the powder metallurgy friction material layer provides a pairing phase friction effect, and the organic friction material layer mainly provides effects of supporting, vibration buffer and sound absorbing; and the expensive high quality raw material can be eliminated, and the material cost can be reduced.

A resin composition for sliding members which comprises 1 to 10 wt. % hydrocarbon wax, 0.1 to 3 wt. % at least one member selected from the group consisting of phosphates, sulfates, and carbonates, 1 to 20 wt. % phenoxy resin, 0.1 to 5 wt. % compatibilizing agent, and a polybutylene terephthalate resin as the remainder; and a sliding member obtained by molding the resin composition. The resin composition for sliding members and the sliding member obtained by molding the resin composition have excellent frictional and wearing properties even when a soft metal, e.g., an aluminum alloy, is used as a mating material.

The invention discloses lubricating grease composition and a preparation method thereof. The lubricating grease composition comprises components in parts by weight as follows: 70-85 parts of base oil, 10-13 parts of monostearate, 2-4 parts of polypropylene wax, 2-3 parts of urea, 0.2-1 part of triethanolamine salt, 0.5-0.8 parts of dioctyl phthalate and 0.05-0.8 parts of diisocyanate. The preparation method comprises steps as follows: (1), performing magnetic stirring on 70-85 parts of the base oil, 2-3 parts of the urea, 0.2-1 part of the triethanolamine salt and 0.05-0.8 parts of the diisocyanate for 30 min; (2), adding 10-13 parts of the monostearate, 2-4 parts of the polypropylene wax, 0.5-0.8 parts of the dioctyl phthalate and 0-1 part of an antioxidant to the mixture, stirring the mixture at the temperature of 80-100 DEG C for 20 min, adjusting the pH value of the mixed solution to 6.7 with 0.1 mol/L of a hydrochloric acid, and stirring the mixed solution for 1 h at the same temperature; (3), performing suction filtration on the product in step (2), washing the product with water thrice, and placing the product into an oven for drying for 3 h to obtain the lubricating grease composition.