160results about How to "Improve wearing rate" patented technology

The invention provides a chemical-mechanical abrasive composition for use in semiconductor processing, which comprises an aqueous medium, an abrasive, and an abrasion accelerator. The abrasion accelerator mainly functions to enhance the removal rate of the substances to be removed, and selected from the compounds of the following formula, the acid-addition salts thereof, or mixtures of two or more of the foregoing compounds and salts:wherein X and Y are independently lone-pair electrons containing atoms or atomic groups; and R1 and R2 are independently H, alky, amino, aminoalkyl, or alkoxy. The chemical-mechanical abrasive composition of the invention may optionally comprise an acidic component and/or a salt thereof, so as to further enhance the abrasion rate. The invention further provides a method of using the above chemical-mechanical abrasive composition for polishing the surface of a semiconductor wafer.

The invention discloses an electric brush for an electric tool motor and a preparation method thereof. Electric brush mixture is roasted and then compressed to form the electric brush. The electric brush mixture comprises, part by weight, 30-60 parts of natural graphite, 25-40 parts of binder, 10-15 parts of amorphous carbon, 10-25 parts of solvent and 4-8 parts of additive. According to the electric brush for the electric tool motor and the preparation method thereof, preparation technologies are simple, operation is easy, the electric brush is low in resistivity, good in abrasion resistance, good in reversing performance, strong in anti-interference capability and long in service life, various requirements of the electric tool motor for the electric brush can be met better, and application ranges are wide.

A method of hard-facing a steel casting is described in which a hard-facing, which comprises a weld alloy matrix and a hard particulate substance, is attached to the casting by welding. In some embodiments the matrix can be of a similar composition to the casting, and in other embodiments the hard particulates can be rounded and/or substantially spherical, or of a substantially even size. A method is also described for hardening and tempering a steel casting after attaching the hard-facing to the casting by welding. After hard-facing the casting is hardened and tempered by heat treatment. In one embodiment the hard-faced casting is heat treated by heating to a temperature in excess of the austenitising temperature of the steel and then cooled by quenching in an aqueous solution, followed by tempering. In one embodiment the steel casting is tempered at a temperature in the range about 550° C. to about 700° C. prior to hard-facing the casting.

The invention discloses a metal and plastic composite self-lubricating material and a preparation method thereof. The metal and plastic composite self-lubricating material comprises a metal layer, a plastic binding layer and a plastic working layer, wherein the plastic binding layer binds the metal layer and the plastic working layer together through a chemical bond of a molecule; one part of theplastic working layer is embedded in a drop pit of the metal layer; the plastic working layer includes the material components according to the mass percent as follows: 60-90 of polyether-ether-ketone, 5-20 of polyfluortetraethylene, 7 of graphite, 1 of MoS2 and 5-10 of aluminium oxide; and the plastic binding layer includes the material components according to the mass percent as follows: 70-90 of polyether-ether-ketone, 5-20 of polyphenyl thioether and 5-10 of aluminium oxide. By adding the plastic binding layer between the metal layer and the plastic working layer, the invention further improves the binding strength of metal and plastic, has favorable heat resistance and resistance to chemical corrosion, no environment pollution, low noise and energy saving; in addition, the usage temperature is -60 DEG C to 250 DEG C, the friction coefficient is 0.08-0.32 and the wear rate is 0.8-3.5*10<-6>mm<3>/N. m.

The invention discloses a kind of none asbestos clutch facing used in cars and its production technology. The recipe of the component is that: E-glass fiber 30~50%, fragrance fiber 1~4%, polyacrylonitrile fiber 0.6~1.2%, the oil of cashew shell friction-type mix 3~6%, oil coke blacking 3~5%, particle graphite 5~8%, zinc oxide 0.2~1%, calcium sulfate 5~15%, heavy calcium carbonate 10~20%, flour acrylonitrile butadiene rubber 15~25%, anti-aging protective TMQ 0.2~0.5%, curing accelerator MBTS 0.2~0.5%, the oil of cashew shell resin modified 6~12%. Banburying mix the component told above in proportions at the proper temperature then make up pellicle by smelting and at last rolls in with the E-glass fiber then forms different ordinance blanks by winding. The blanks confect by heat pressing at the proper temperature and pressure then make into production by grinding and drilling holes. It has the merits like that: high strength, good ductility and stabilize coefficient of friction and so on.

An overcoat layer and method to make an overcoated photoconductor drum of an electrophotographic image forming device using irradiation such as with electron beam (EB) or ultraviolet (UV) light is provided. The photoconductor drum is then cured using EB dose of between 10 and 100 kiloGrays (kGy), preferably between 20 and 40 kGys or UV irradiation with an exposure of between 0.1 and 2 J/cm². The unique overcoat layer of the present invention is formed having a biphasic morphology comprised of a highly cured crosslinked phase and a second phase enriched in uncured material. The desired amount of uncured uncrosslinked material found in the second phase of the biphasic structure, is between 2-70 wt % range, with particularly good combination of long-life and electrical performance when present at the 5-50 wt % level, and the best performance at the 15-40 wt % level. The biphasic morphology of the overcoat layer using the method of the present invention gives rise to the good wear rates while allowing rapid transport of the electrical charge and thus fast discharge properties of the photoconductor drum.

An abrasive article includes an organic bond material, an abrasive material dispersed in the organic bond material, mineral wool microfibers uniformly dispersed in the organic bond material, the mineral wool microfibers being individual filaments, one or more reinforcement and/or chopped strand fibers dispersed in the organic bond material and one or more active fillers including, for example, a manganese compound. The abrasive article can be used in the abrasive processing of a workpiece.

The invention relates to the technical field of composites and specifically relates to a graphene-like nano carbon nitride modified polytetrafluoroethylene friction material as well as a preparation method and application thereof. The graphene-like nano carbon nitride modified polytetrafluoroethylene friction material provided by the invention comprises the following preparation raw materials in parts by mass: 50-80 parts of polytetrafluoroethylene, 5-15 parts of polyimide, 5-10 parts of polybenzoate, 5-20 parts of aramid pulp, 5-15 parts of potassium titanate whiskers and 0.5-1.3 parts of graphene-like nano carbon nitride. The graphene-like nano carbon nitride modified polytetrafluoroethylene friction material prepared by adopting the raw materials with the proportions also has relativelylow mass wear rate and relatively high conversion efficiency on the basis of stable friction coefficient and is capable of meeting the demand for the friction material in an ultrasonic motor.

A tread pattern for a tire, the tread pattern being formed by elements in relief defined by grooves, some of these elements in relief being provided with at least one blind incision, that is to say, one which does not open into the grooves. These elements in relief include at least one cutout which opens into at least one groove defining these elements, and such that, on the running surface, each blind incision crosses at least one open-ended cutout of the same element, whatever the level of wear of the tire. Each of these open-ended incisions has a depth substantially equal to the depth of the blind incisions which it crosses and is filled with a filler material, the filler material having the characteristic of being gradually eliminated under the action of frictional contact with the ground during travel to form a channel of low depth which enables the air trapped in the blind incisions to escape.

Carbon-carbon composite brake discs are manufactured by processes that include the use of PAN or pitch fibers and their combinations, combined with pitch, resin, or CVD/CVI matrix carbons. An additional process step is provided, in which a controlled amount of a carbon additive, such as carbon black and/or activated carbon, is infiltrated in to the bulk porosity of the composite prior to one or more of the densification cycles. Typical methods of infiltration include use of a solution or suspension of the powdered carbon in water or solvent solution so as to uniformly distribute the particulates throughout porosity within the carbon fiber preform prior to one or more of the densification cycles. The presence of the activated carbon and/or carbon black additive, distributed throughout the carbon-carbon composite brake disc, facilitates the adsorption and retention of available moisture in the composite. In use, the moisture is released into friction films which form on the composite brake discs, so that their lubricating properties are obtained, for instance during cold taxi stops, thereby lowering wear rates.

An aromatic silicon-containing compound has the formula:

Ar—[X-L-SiR_n(OR′)_3-n]_m

where Ar represents an aromatic group, X represents a divalent or trivalent group; L represents a divalent linking group; R represents a hydrogen atom, an alkyl group or an aryl group; R′ represents an alkyl group having 1 to 5 carbon atoms; n is an integer of from 0 to 2; and m is an integer of from 1 to 5. The aromatic silicon-containing compound can be used in electrophotographic photoreceptors, particularly in outmost protective layers of such electrophotographic photoreceptors.

The invention relates to a preparation method for a 429 stainless steel composite coating sprayed on a magnesium alloy surface. The preparation method comprises the steps that 95-40wt% of 420 stainless steel powder and 5-60wt% of hard reinforcement phase material powder according to a powder mixing ratio; the above two kinds of powder are placed in a mechanical material mixing machine to be mixed so that coating powder is prepared; the magnesium alloy base material surface is sequentially subjected to acetone cleaning and sand-blasting roughening treatment; the coating powder is arranged in a powder conveying device of cold-spraying equipment; then a magnesium alloy base material is fixed on a spraying clamp, and the 420 stainless steel composite coating is manufactured on the magnesium alloy base material surface with a cold-spraying technique; and the hard reinforcement phase material is one or more of SiC, Al2O3, TiC, WC-12Co, WC-17Co, WC-CoCr, WC-NiCr. The preparation method is simple in technique; thermal influence on the magnesium alloy base material is small by adopting the cold-spraying technique; the prepared composite coating is combined with the base body firmly; the structure is compact and uniform; the coating has good corrosion-resistance and abrasion-resistance, and is an ideal surface reinforcement coating for surfaces of the magnesium alloy and components of the magnesium alloy.

The invention relates to a metal substrate (11) coated at least partially with a layered structure. The layered structure comprises an intermediate layer (14) deposited on said substrate (11) and a tetrahedral carbon layer (16) deposited on said intermediate layer. The intermediate layer comprises at least one amorphous carbon layer having a Young's modulus lower than 200 GPa and the tetrahedral carbon layer has a Young's modulus higher than 200 GPa. The invention further relates to a method to improve the adhesion of a tetrahedral carbon layer to a substrate and to a method to bridge the gap in Young's modulus of the metal substrate and the Young's modulus of a tetrahedral carbon coating deposited on said metal substrate.

A polytetrafluoroethylene composite material is prepared by steps of mixing polytetrafluoroethylene powders, polyimide powders and graphite powders to prepare a mixture and subjecting the mixture to baking, cold pressing, sintering and cooling. The prepared polytetrafluoroethylene composite material comprises polytetrafluoroethylene, polyimide and graphite, wherein the mass percent of the polytetrafluoroethylene is between 65% and 75%, the mass percent of the polyimide is between 17% and 22%, and the mass percent of the graphite is between 7% and 13%. The polytetrafluoroethylene composite material has low friction coefficient and wear rate so that the mechanical property and abrasion resistance are improved.

The invention relates to a catalyst for preparing maleic anhydride from n-butane through oxidation. The catalyst mainly overcomes the problem of low catalytic activity in the prior art. According to the invention, three elements consisting of vanadium, phosphorus and oxygen are used as the main body of the catalyst, and a certain amount of a metal additive is cooperatively used. The catalyst comprises, by weight, 26 to 35% of elemental vanadium, 14 to 20% of elemental phosphorus, 30 to 50% of elemental oxygen and 0.02 to 7% of the metal additive. The catalyst is subjected to constant-temperature constant-humidity treatment, doping of a pore forming agent and secondary molding, so the catalysis performance and strength of the catalyst are improved, and the catalyst is applicable to the field of preparation of maleic anhydride from n-butane through oxidation.

An expansion apparatus for expanding a portion of a tubular comprises at least two expansion members adapted for selective deployment against a wall of a tubular. The expansion apparatus may be controlled to select a first expansion member to be deployed and the apparatus operated to expand a section of the tubular. The deployed expansion member may then be inactivated or retracted, such that the expansion member is no longer deployed against the wall of the tubular or is otherwise rendered inoperative, and a second expansion member can then be deployed and a further section of the tubular expanded.

A micro-copper-formulated ceramic brake pad is made with aramid pulp, carbon fiber, magnesium hydroxide, copper fiber, brown fused alumina, antimony sulfide, ceramic fiber, superfine iron oxide powder, calcium sulfate whisker, potassium titanate, barite, crystalline flake graphite, calcined petroleum coke, nano hollow float beads, flake aluminum powder, nitrile butadiene rubber powder, cashew nut shell oil modified phenolic resin, zirconite, boron nitride, zinc oxide, and benzoxazine resin. The components are reasonably matched, and advantages of the materials can be given to full play in abrasive materials. The novel fiber materials are reasonably composited, performance defects of the materials can be mutually complemented, and high performance is achieved through mutual connective action. The micro-copper-formulated ceramic brake pad has low content of heavy metals and smaller than 0.5% of copper content and therefore, is very environment friendly.

The invention discloses a preparing method and application of a laser cladding precipitation-hardening stainless steel wear-resisting anti-corrosion coating. A basis material is 1Cr15Ni4Mo3N precipitation-hardening stainless steel and comprises, by weight percentage, 0.11%-0.16% of C, 0.5%-1.0% of Mn, 2.3%-2.8% of Mo, 4.0%-5.0% of Ni, 14.0%-15.5% of Cr, 0.05%-0.10% of N, not larger than 0.7% of Si, not larger than 0.02% of S, not larger than 0.03% of P and the balance Fe; and a cladding layer material comprises, by weight percentage, 10.65%-12.50% of C, 2.36%-2.77% of Mo, 4.08%-4.79% of Ni, 11.18%-13.12% of Cr, 1.96%-6.02% of N, 0.23%-0.37% of Al, 0.16%-0.25% of Si, not larger than 0.05% of S, not larger than 0.05% of P and the balance Fe. A synchronous powder feeding manner is adopted for feeding cladding layer powder to the positions below laser beams through a powder feeder to be melted, the cladding layer powder solidifies on the base surface to form a cladding layer, and the laser cladding precipitation-hardening stainless steel wear-resisting anti-corrosion coating is used for rotor hubs of large business machines, air battle machines and helicopters in the field of spaceflight, aviation and ocean and is used for fasteners and force bearing parts with high wear resistant and corrosion resistant requirements.

The invention relates to a composition and a preparation method of an asbestos-free friction material taking carbon fibre or other carbon materials as a main body, and in particular to a carbon-based friction material for an automobile disc brake and a preparation method of the carbon-based friction material. The friction material and the preparation method of the friction material mainly aim at solving the technical performance problems that a brake pad is high in the heat fading of friction coefficient and wear rate and is easy in the production of brake noises, and as a formulation of the brake pad often contains asbestoid fibre, the brake pad does not meet the requirement of environment-friendliness, etc. The friction material is a novel friction material with a carbon base between a carbon-carbon base and an NAO or ceramic base. The friction material mainly comprises carbon materials such as the carbon fibre and graphite, and comprises accessories such as a resin binder and a small number of inorganic or organic fillers. The friction material is produced by hot press moulding. Compared with a friction material with an NAO or ceramic base, the carbon-based friction material for the automobile disc brake disclosed by the invention has the advantages of being reliable in brake performance, low in brake noises and long in service life, and preventing friction coupling from being damaged.