54results about How to "Improve frictional stability" patented technology

The invention discloses a resin-based yawing brake pad for a wind-generated generator and a preparation method thereof. The resin-based yawing brake pad comprises phenolic resin, nitrile butadiene rubber, organic friction powder, chopped steel fiber, red copper fiber, aramid fiber, aluminum silicate/KFK fiber, graphite, barite and the like. The preparation method comprises the following steps of: weighing various components according to the formula; mixing the components by a plow harrow type blender mixer at high speed; ensuring that each fiber is fully dispersed uniformly; hot pressing forming at the temperature of 160-200DEG C; carrying out heat treatment in a heat treatment tank; cooling to the room temperature along the temperature of the furnace; and finally, machining to obtain the resin-based yawing brake pad. Compared with the general powder metallurgy brake pad, the yawing brake pad has the advantages of proper static friction coefficient, stable friction coefficient, low brake noise, smaller antithesis wear and lower manufacturing cost and can fully meet the yawing low-speed brake of the wind-generated generator.

The invention discloses a carbon-silicon carbide double-ingredient substrate carbon fiber composite material as well as a preparation method and application thereof. The method comprises the followingsteps of (1) performing weaving and high-temperature heat treatment on a carbon fiber prefabricated body; (2) preparing a porous carbon/carbon blank body; (3) introducing carbon elements and siliconelements into the carbon/carbon blank body in an impregnating mode; after the soaking and pyrolysis circulation period, obtaining a Cf/Cm-Sim porous intermediate; (4) performing embedded fusion Si seeping on the Cf/Cm-Sim porous intermediate to obtain a Cf/Cm-SiCm composite material. The inside SiC distribution of the composite is uniform; the residue Si content is 1.2 to 3.3 percent; the bendingintensity is 236 to 275MPa; the compression intensity is 322 to 364MPa; the dynamic friction coefficient is 0.32 to 0.48; the mechanical/friction performance is excellent; the thermal stability and the environment applicability are high; the material is applicable to the manufacturing of automobile braking discs/sheets.

The invention relates to a metallic matrix spindle brake pad for a wind driven generator and a preparation method thereof. The material comprises iron powder, copper powder, tin powder, sulphur, shortcut steel fiber, copper fiber, high alumina ceramic fiber, inorganic oxide, graphite, etc. The preparation method comprises: weighing the components of the material according to the formulation, stirring and mixing the components in a special dry-type mixer, and ensuring the fibers to be fully dispersed and even; pressing the mixture for molding at the normal temperature, then sintering at the certain pressure and temperature, and cooling along with a furnace; finally, machining to obtain the metallic matrix spindle brake pad. Compared with the common powder metallurgy brake pad, the frictionmaterial prepared by the method is added with metals and the ceramic fiber, so as to remarkably improve the mechanical properties of the material and the static friction torque; meanwhile, the product has the advantages of moderate and stable coefficient of dynamic friction, better wear resistance, low brake noise and less dual wear, can completely meet the requirement of the wind driven generator for high speed brake of a spindle, and realizes environmental protection in deed.

The invention relates to a metal-based yaw brake block for a wind-powdered generator and a manufacture method thereof. The materials comprise iron powder, copper powder, tin powder, sulfur, chopped steel fiber, copper fiber, high-alumina ceramic fiber, inorganic oxides, graphite, and the like. The manufacture method comprises the following steps of: firstly, weighting all the component materials according to a prescription; stirring and mixing in a special dry-type mixer to fully and evenly disperse all the fibers; pressing and molding at room temperature; then, sintering at a certain pressure and temperature; cooling in a furnace; and finally, mechanically processing to obtain a material of the invention. Compared with a common metallurgic brake block, the friction material prepared by the method remarkably improves the mechanical properties and the static friction torque of the materials by adding metal and ceramic fibers. Meanwhile, the product has the advantages of suitable and stable dynamic friction coefficient, better wear resistance, smaller dual wear and low manufacture cost and can fully satisfy the yaw brake requirement of a wind-powdered generator.

The invention relates to a preparation method of an aluminum matrix composite material brake disc, and belongs to the field of metal matrix composite materials. BN powder, MoS2 powder and titanium-plated diamond micro-powder are selected to serve as a reinforcement body, and pure aluminum serves as a matrix; through ball milling, the BN powder and Al powder are firstly mixed, and therefore the BNpowder is evenly distributed in the Al powder to form composite powder; then the composite powder, the MoS2 powder and the titanium-plated diamond micro-powder are mixed evenly according to a certainproportion, then pressing and pre-forming are carried out, in the pressing process, through a powder filling control manner, (BN+Al) composite powder is distributed to the 1/4 width position of the inner side of a pre-forming blank of an annular brake disc, and (BN+Al+MoS2+titanium-plated diamond) quaternary mixing powder is distributed to the outer side; and finally, the pressed and pre-formed blank is placed into a vacuum hot-pressing furnace for hot pressed sintering, and the composite aluminum matrix composite material brake disc is finally obtained. By means of the above method, the prepared motorbike brake disc is small in mass and better in radiating performance and wear-resisting property, and the working stability and reliability of the brake disc can be comprehensively improved.

The invention discloses an inorganic nano modified phenolic resin brake pad which is prepared from the following raw materials in parts by weight: 10-15 parts of inorganic nano modified phenolic resin, 15-20 parts of steel fibers, 5-6 parts of glass fibers, 20-30 parts of barite, 15-25 parts of calcium carbonate, 20-30 parts of bentonite, 8-12 parts of granular graphite, 7-8 parts of cashew nut shell oil frictional powder, 3-5 parts of spongy iron powder, 4-6 parts of magnesium oxide and 7-10 parts of garnet, wherein the inorganic nano modified phenolic resin is obtained by adopting modified nano vermiculite to modify phenolic resin, the water content is 0.5-0.8wt% and the content of free phenol is 1.5-2wt%. The invention further discloses a preparation method of the inorganic nano modified phenolic resin brake pad. According to the invention, the inorganic nano modified phenolic resin brake pad is high in thermal stability, excellent in heat resistance, good in frictional stability and wear resistance, simple in preparation process and convenient for actual operation.

The invention relates to a non-asbestos copper fiber brake plate material, composed of phenolic resin, frication dust, butadiene acrylonitrile rubber, alumina, chromite, feldspar, cut copper fiber, needle shape wollastonite powder, tire powder, magnesia and lignin fiber; the weight percentages of the ingredients are as follow: phenolic resin 8-12%, frication dust5-15%, butadiene acrylonitrile rubber2-5%, alumina5-10%, chromite15-25%, feldspar5-8%, cut copper fiber6-8%, needle shape wollastonite powder10-15%, tire powder15-20%, magnesia2-5% and lignin fiber15-20%. The non-asbestos fiber brake plate with a copper substrate is of high brake performance, stable friction coefficient, high thermal conduction, good head dissipation performance in the rubbing process and good plasticity and has no harm to dualization; the copper substrate has small binding affinity to oxygen and is slow to oxidate in air.

The invention discloses an automotive brake block made from a modified thermoplastic phenolic resin material. The brake block comprises the following raw materials in parts by weight: 15-20 parts of modified thermoplastic phenolic resin, 15-20 parts of nylon fiber, 8-10 parts of pitch-based carbon fiber, 5-10 parts of polypropylene fiber, 8-10 parts of lignin fiber, 3-5 parts of expanded vermiculite, 10-17 parts of barite, 12-15 parts of chromium iron powder, 8-10 parts of fluorite, 5-7 parts of crystalline flake graphite, 6-8 parts of nitrile rubber powder, 5-8 parts of tyre powder, 5-6 parts of iron powder and 10-13 parts of silicon dioxide. The automotive brake block made from the modified thermoplastic phenolic resin material provided by the invention is good in toughening effect and thermal stability, excellent in heat-resistant quality, and better in friction stability and wearable performance.

The invention discloses a method for preparing a high-temperature-resistant friction material from modified ramie fibers and belongs to the technical field of friction material preparation. Raw ramie is weighed and soaked with a sodium chloride solution, after heating and heat preservation, the pH value is adjusted, filtering is carried out after heat preservation, a filtered material is obtained, after washing and air-drying, the material is mixed with phospholipase C and bakelite powder, and degummed modified ramie fibers are prepared through degumming modification; an ethyl orthosilicate ethanol solution, sodium dodecyl sulfate and other matter are taken and mixed to be prepared into a modified mixed solution, the modified mixed solution is mixed with the degummed modified ramie fibers, and the modified ramie fibers are prepared after ultrasonic oscillation and microwave reaction modification; the modified ramie fibers are mixed with butadiene-acrylonitrile rubber and other matter, and the high-temperature-resistant friction material is prepared through hot-press molding in a die. The method has the advantages that the preparation steps are simple, and the obtained product is good in heat resistance and can resist the temperature of 200-220 DEG C; the friction stability of the material is good, and the mechanical performance is improved by 45-48%.

The invention relates to a preparation method of a FeSi2 modified C/SiC braking material. A method combining CVI with RMI is adopted to prepare the FeSi2 modified three-dimensional needled C/SiC braking material. The preparation method includes: taking FeSi75 alloy powder as a RMI infiltration raw material; obtaining the FeSi2 modified C/SiC braking material through a reactive melt infiltration (RMI) process. By the preparation method, raw material cost is lowered remarkably, and RMI process temperature is lowered; a FeSi2 phase is introduced into a C/SiC composite material, so that strength and heat conductivity of the braking material are improved, friction stability is improved, and wear rate is lowered.

The invention discloses a preparation method of a graphene oxide reinforced polymethyl methacrylate/carbon microsphere composite material. The preparation method comprises the following steps: carrying out a hydrothermal reaction by using a glucose solution as a carbon source to obtain carbon microspheres; dissolving the carbon microspheres in a mixed solution of deionized water and anhydrous ethanol, adding a mixed solution of a silane coupling agent and anhydrous ethanol, carrying out a reaction under a condensation reflux heating condition to obtain modified carbon microspheres; preparing asolution from the modified carbon microspheres, water and methyl methacrylate, marking the solution as a solution A, introducing nitrogen, continuously stirring; preparing a graphene oxide water solution, marking the graphene oxide water solution as a solution B, continuously stirring; adding the uniformly stirred solution B into the uniformly stirred and mixed solution A to obtain a solution C,continuously stirring the solution C until the solution C is uniformly mixed; adding sodium dodecyl benzene sulfonate into the solution C, heating for reaction, and filtering, centrifuging, washing and drying the reaction product to obtain the graphene oxide reinforced polymethyl methacrylate/carbon microsphere composite material.

The invention discloses a copper-based composite material reinforced by double-size hard particles. The copper-based composite material is prepared from, by mass, 1%-5% of ceramic particles, 6%-12% ofhigh-carbon ferrochromium particles, 8%-12% of natural flake graphite and the balance of electrolytic copper powder, wherein the ceramic particles are one or more of copper-plated SiC particles, copper-plated B4C particles, copper-plated TiC particles, copper-plated A1203 particles, copper-plated Cr203 particles, copper-plated SiO2 particles, copper-plated Si3N4 particles and copper-plated AlN particles. The invention also provides a preparation method of the copper-based composite material reinforced by the double-size hard particles.

The invention relates to the technical field of automobile brake material preparation and in particular to a preparation method of a low-wear-type ceramic-based composite bake material. The preparation method comprises the steps: adopting natural organic sponge with an abundant pore structure as a raw material, extracting moso bamboo fiber bundles from moso bamboo, and stacking the sponge and thefiber bundles at intervals; then, carrying out puncturing treatment by using a barbed needle to make the moso bamboo fiber bundles distributed among sponge blocks at a vertical angle to obtain a complex; carrying out carbonization treatment on the complex, then, carrying out vapour fumigation on the complex by using methyltrichlorosilane, and carrying out in-situ deposition under a thermal actionto generate a silicon carbide crystal; and then, soaking the silicon carbide crystal by using tetraethyl orthosilicate to increase the density, and carrying out high-temperature sintering to obtain silicon carbide ceramic brake material. The brake material prepared by using the preparation method is good in wear resistance, high in friction coefficient, not easy to exceed the rated brake power ina brake process and wide in application prospect.

The embodiment of the present invention discloses a gear oil, which comprises the following components by weight percentage: 1.5% polymethyl methacrylate, 0.3% V1156 pour point depressant, 0.3% di-tert-butyl-p-cresol, dialkyl dithio Zinc phosphate 2%, bis-succinimide 1%, friction system improver 0.5%; antifoaming agent 0.0001%, pigment 0.0001%, and the rest is base oil. A preparation method of the above-mentioned cleaning agent is also disclosed. The above raw materials are stirred and mixed evenly at room temperature; the gear oil and its preparation method of the embodiment of the present invention have excellent high temperature stability, prevent oil from oxidative deterioration and deposit formation, and keep the gearbox clean. Excellent anti-wear protection, effectively prolonging the service life of components. Excellent friction characteristics to ensure continuous, reliable and trouble-free operation of the transmission. Good friction stability and smoother gear shifting.

The invention relates to a polypropylene composite material and a preparation method thereof, and belongs to the technical field of a modified material. The polypropylene composite material is prepared from the following ingredients in parts by weight: 65 to 80 parts of polypropylene, 2 to 12 parts of tungsten disulfide nanometer rods and 1 to 8 parts of compatilizers. The specific content of tungsten disulfide nanometer rods are added into polypropylene substrates under the cooperated dispersion effect of the specific content of compatilizers, so that mutual friction is generated between WS2materials in the prepared polypropylene composite material; layered sliding is generated; the WS2 becomes thin and small through friction; small fragments fill the defects in the abrasion process, sothat the friction undulation is further reduced; the friction stability is enhanced. Therefore the anti-scratching performance and the intensity of the obtained polypropylene composite material are obviously improved.

The invention discloses a cyclotriphosphazene ionic liquid used as a lubricant and a preparation method thereof. The ionic liquid is prepared by mixing the following components together: diglycol monomethyl ether, triglycol monomethyl ether, or tertglygol monomethyl ether derivatives of cyclotriphosphazene, lithium tetrafluoroborate, lithium hexafluorophosphate, and lithium trifluoromethanesulfonate or bis(trifluoromethane)sulfonimide lithium. The ionic liquid has a good chemical stability, thermal stability, and abrasion reducing and wear-resistant performance. The preparation method of the ionic liquid provided by the invention has the advantages of simple preparation process, low cost, excellent performance, and suitability for industrial application.

The invention discloses a solid self-lubricating coating and a preparation method thereof.The coating is formed by compounding a hard diamond-like phase serving as an intrinsic supporting layer and a soft graphitization phase serving as a surface lubricating layer, the hard diamond-like phase is formed by mixing sp2 and sp3 hybrid carbon structures, and the atomic percentage content of sp3 is 25-70%; the soft graphitized phase is mainly composed of an sp2 hybrid carbon structure, the atomic percentage content of sp2 is 90% or above, and the content of a six-membered ring structure is 60% or above; the composite lubricating coating has the advantages of high hardness, high bearing capacity, low abrasion, super-lubricity and friction coefficient lt; 0.01, the solid self-lubricating coating material can provide wear-resistant lubricating protection for a matrix or a workpiece in various environments such as high load and high speed, the preparation method is simple, the operability is high, industrial production is easy, and the solid self-lubricating coating material is excellent in comprehensive performance, long in service life and high in reliability.