162results about How to "Maintain wear resistance" patented technology

The invention relates to a prefabricated part of a composite abrasion-resistant part and a method for manufacturing the abrasion-resistant part with the same. The prefabricated part is formed by mixing metal powder with carbide ceramic particles or particles by crushing a hard alloy and sintering the mixture at a high temperature and can be made into special shapes of columns, strips, blocks, honeycombs, and the like. The method comprises the following steps of: regularly arranging prefabricated parts on the end surface of a cast form; casting liquid metal by adopting a common or negative pressure cast method; impregnating the liquid metal into the prefabricated parts to form an abrasion-resistant part of a composite material, wherein the surface layer of the abrasion-resistant part comprises a matrix metal and a composite material. The abrasion-resistant part of the composite material, which is made by using the method, ensures the wear-resistant performance of the abrasion-resistant part and has high anti-impact capability.

Disclosed is an image forming apparatus for lowering friction coefficient and lowering surface energy of photoconductor surface in particular, which comprises an electrophotographic photoconductor, charging unit, light exposure unit, developing unit, transferring unit, and fixing unit, the electrophotographic photoconductor comprises a photosensitive layer on a conductive support and fluoropolymer fine particles at the outermost layer, a part of the fluoropolymer fine particles are exposed above the surface of the outermost layer in configurations of primary particles and secondary particles formed by flocculation of plural primary particles, and sum of area ratios of particles in the configurations of the primary particles and the secondary particles, each particles having an average diameter D of 0.15 μm≦D≦3.0 μm as respective projected figures of exposed portion above the surface of the outermost layer, is 10% to 60% based on the entire surface area of the outermost layer, and wherein the binder resin in the outermost layer comprises a polyalylate copolymer resin having a structural unit of alkylene-aryldicarboxylate.

The present invention provides a grease composition capable of effectively preventing a rolling surface of a bearing from having hydrogen brittleness-caused peeling, a grease-enclosed bearing in which the grease composition is enclosed, and a rotation-transmitting apparatus with a built-in one-way clutch in which the grease composition is enclosed at a sliding portion. The grease composition contains a base grease consisting of a base oil and a thickener; and an additive added to the base grease. The grease composition prevents a frictional wear surface of the sliding portion or a newly generated surface consisting of iron or the like exposed owing to wear from being peeled owing to hydrogen brittleness. The additive contains a bismuth-based additive or a magnesium-based additive. The bismuth-based additive consists of at least one of inorganic bismuth and organic bismuth not containing a sulfur component. The magnesium-based additive consists of at least one of inorganic magnesium and organic magnesium. The grease-enclosed bearing encloses the above-described grease composition.

The present invention provides an abradable coating which is applied to the surfaces of stationary parts in rotary machinery such as gas turbines and does not cause damage or other trouble to the blades, as well as a method for forming the same. This method for forming an abradable coating comprises the steps of coating a shroud material with a partially stabilized zirconia ceramic material to form a zirconia ceramic layer having a cubic or tetragonal crystal structure on the surface of the shroud material; and subjecting the shroud material having the zirconia ceramic layer formed thereon to high-temperature water treatment at a temperature of 100 to 450° C. for 1 to 300 hours and thereby transforming the crystal structure of the zirconia ceramic layer into a monoclinic crystal structure. Alternatively, shot peening may be employed in place of the high-temperature water treatment.

The invention provides a hard coating film to solve the problem of film cracking or curling. The technical proposal is that: the hard coating film comprises a support body and a hard coating; the hard coating has the compositions and weight portions as follows: 20 to 90 portions of UV curing acrylate, 2 to 20 portions of thermoplastic resin, 2 to 15 portions of photoinitiator, 0.2 to 15 portions of silicone, and 10 to 90 portions of solvent. The invention can inhibit cracking or curling caused by curing shrinkage, prohibit fingerprints or dusts, etc. from attaching on the surface of the film where attached fingerprints and dusts can be easily wiped off, and maintain the scratch resistance and wear resistance of the hard coating film.

The invention discloses a metal and ceramic bonding agent and a preparation method of the metal and ceramic bonding agent, a CBN grinding wheel and a manufacturing method of the CBN grinding wheel. The metal and ceramic bonding agent is composed of, by mass fraction, 75%-92% of ceramic and 8%-25% of metal. The ceramic is composed of, by mass fraction, 40%-65% of SiO2, 8%-35% of B2O3, 6%-20% of Al2O3, 5%-18% of Na2O5, 0.5%-5% of CaO, 3%-10% K2O, 0.5%-2% of MgO and 2%-6% of TiO2. The metal is composed of, by mass fraction, 55%-80% of Cu, 15%-30% of Sn and 5%-20% of Ni. The metal and ceramic bonding agent can be used as a CBN grinding wheel bonding agent and overcomes the defects that in the grinding process of the ceramic CBN grinding wheel, the surface roughness of a workpiece is large, chatter marks are generated easily, and impact resistance is poor.

A railway car wheel comprises a rim having a flange and a tread portion. The tread portion contains 0.35-0.55% C and has a Vickers hardness of at least 360 and comprises a bainite structure, a tempered martensite structure, or a mixture of both.

The production method of bimetal saw blade for cutting metal includes the following three procedures: 1. heat treatment of saw-tooth material; 2. welding the azotized saw-tooth material on the saw band, adopting instantaneous electric welding process, and the energization time of the weld is not greater 1 second; 3. cutting saw-tooth material on the saw band, adopting laser cutting process and cutting the saw-tooth material into the saw-tooth form. Said invention is characterized by that said invented bimetal saw blade is made up by equidistantly welding several saw-tooth materials on the saw band and cutting them, and after the heat treatment of the saw-tooth material a coating process is added, so that the saw-tooth material can be easily welded on the saw band.

The invention discloses high-performance colorized water-permeable asphalt concrete and a preparation method thereof. The high-performance colorized water-permeable asphalt concrete is prepared from mineral aggregate, a colorless bonding material and a pigment satisfying grading requirements through mixing according to a mass ratio of 100: 4.5-7.5: 1.5-2.5, wherein the colorless bonding material is prepared from base oil, petroleum resin, a polymer and a coupling agent according to a mass ratio of 40-60: 30-45: 2-25: 0.05-3.0 through blending. The high-performance colorized water-permeable asphalt concrete has a red, yellow, green, blue or silver gray color, has pavement performances completely according with or exceeding the JTG F40-2004 road asphalt pavement construction technology standard requirements and is suitable for low carbon green road surfaces of various roads, squares, parks and stadiums.

The invention relates to a directional power-assisted oil composition and its application and mainly solves the problems of poor compatibility between a directional power-assisted oil and a rubber sealing member and the fault of a power steering system due to deformation or failure of the rubber sealing member with the application of a power-assisted oil composition in the power-assisted steering system in the prior art. The directional power-assisted oil composition comprises the following components of: by weight, a) 0.1-5 parts of boron polyisobutylene succinimide; b) 95-99.9 parts of base oil. By the adoption of the technical scheme, the problems are greatly solved. In addition, the technical scheme can be used in the industrial production of the directional power-assisted oil composition provided by the invention.

Disclosed is a sheet for drilling suitable for use as a cover sheet for efficiently realizing a high-quality product upon drilling in the process of fabricating a printed circuit board. The sheet for drilling includes an organic material layer for imparting a lubricating function and a metal layer in contact with the organic material layer, the surface of the metal layer opposite the surface in contact with the organic material layer is controlled to have Theta of a predetermined value or more according to a slippage testing method. Thus, when the sheet is placed on a blank PCB board during the drilling of a printed circuit board, it has increased adhesiveness to the board and therefore an air layer is not formed between the sheet for drilling and the board, thus preventing the slippage of a drill and decreasing the vibration thereof, resulting in improved drill straightness. Wear resistance of the drill is maintained, thus increasing the drill replacement period, thereby realizing high-quality sheets for drilling.

The invention discloses a graphene superfine fiber polyurethane synthetic leather and a preparation method thereof. The graphene superfine fiber polyurethane synthetic leather comprises a surface layer, a middle layer and an adhering layer which are respectively prepared from the following components of high-performance waterborne non-yellowing polyurethane resin, nylon, graphene, superfine fiberpolyurethane synthetic substrate, an abrasion-resistant agent, a light-resistant agent, a flame-retardant master batch and pure water. The preparation method comprises the following steps of S1, weighing the raw materials according to a ratio; S2, treating the graphene; S3, mixing and stirring the raw materials; S4, filtering the solution by a filtering net, and preparing an automobile superfine fiber leather by a dry type synthetic leather production line. The prepared graphene superfine fiber polyurethane synthetic leather has the advantages that the comprehensive property is excellent, thetesting result in each aspect is good, the physical indexes are basically the same with the physical indexes of common superfine fiber automobile interior trim, the moisture and air ventilating property is realized, the abrasion-resistant property is excellent, and the touch feel of the natural leather is realized.

The invention provides a CARP optimizing and cleaning device, and relates to the field of machine manufacturing. The CARP optimizing and cleaning device comprises a polyurethane blade (1) and an aluminum alloy insert (2). The polyurethane blade (1) is embedded in the aluminum alloy insert (2). An oblique contact face (1-1) is arranged on the inner side face of the upper end of the polyurethane blade (1), and the included angle alpha between the contact face (1-1) and the perpendicular line is 20-30 degrees. According to the friction coefficient between the blade and a belt, material property of the CARP optimizing and cleaning device and characters of conveyed materials, the shape and size of the blade are designed through difference, the contact area and sweeping angle of a cleaner are guaranteed, materials which fall down on the belt can be completely eliminated, the blade is made of the polyurethane material, so that wear resistance of the blade is ensured, and the service life of the blade is guaranteed.

A pneumatic tire in which a tread part is provided with a pair of central main grooves extending continuously around the circumference of the tire on both sides of a tire equator C, and central thin grooves extending continuously around the circumference of the tire on the tire-axially inner sides of the central main grooves and having less groove width than the central main grooves. The central thin grooves include a linear first central thin groove running along the tire circumference, and zigzagging second central thin grooves. The first central thin groove is provided on the tire-axially inner sides of the second central thin grooves.

The invention provides a preparation method of a protective coating based on a working surface of a mould matrix. The preparation method comprises the steps that 1) first paint is sprayed on the working surface of the mould matrix to form a hard wear-resistant coating; 2) an inward sunk microstructure is prepared on the surface of the hard wear-resistant coating; and 3) second paint is sprayed on the surface of the hard wear-resistant coating to form a lubricant coating, thereby accomplishing the preparation of the protective coating based on the working surface of the mould matrix. With the adoption of the preparation method, the protective coating having high bonding strength, wear resistance and lubricating property can be prepared on the working surface of the mould matrix, the problem that the interface bonding strength between the traditional hard wear-resistant layer and the traditional lubricant coating is low is solved, and the life of a mould is prolonged.

The invention discloses a Cu-Ni-Sn alloy belt foil for 5G communication and a preparation method thereof. The Cu-Ni-Sn alloy belt foil is prepared from the following raw material components in percentage by weight: 8.5-9.5% of nickel, 5.5-6.5% of tin, 0.2-0.5% of manganese, 0.1-0.3% of zinc, and the balance copper and impurities. The preparation method comprises the following steps: melting weighed copper and nickel, covering with wood charcoal, sequentially adding manganese, tin and zinc, stirring and dissolving after heating up to a temperature of 1300-1330 DEG C, slagging-off, covering withwood charcoal, standing and converting, slagging-off, and covering with wood charcoal; performing pull-casting, homogenizing annealing treatment, face-milling, cold-rolling cogging, intermediate solid-solution treatment, intermediate rolling, intermediate solid-solution treatment and finished product rolling by adopting a reverse pushing-pulling and stopping blank pulling way, and obtaining foilwith a thickness being 0.04-0.1mm. Elasticity, wear resistance and corrosion resistance of a Cu-Ni-Sn copper alloy in the prior art are kept, and meanwhile, the Cu-Ni-Sn alloy belt has good forming property, relatively high conductivity and excellent shielding performance, can realize industrial production of the Cu-Ni-Sn alloy belt foil for 5G communication, replaces import, fills up the domesticblank to promote copper processing industry development needs of the current stage.

A novel mechanical element is disclosed. The mechanical element comprises at least two surfaces movable at peripheral speeds differed from each other, and a lubricant composition disposed between said two surfaces, a surface of at least one said two surfaces having an organic residue having carboxyl group, sulfoxyl group, cyclic or non-cyclic carbamoyl group, cyclic or non-cyclic ureylene group, cyclic or non-cyclic sulfarnoyl group, or cyclic or non-cyclic amidino group, and said lubricant composition comprising a discotic compound having at least one tautomeric group represented by a formula (1) in which A is a ring in which from 5 to 7 atoms are embedded, wherein one of, or two or more of the ring-composing atoms may have a substituent, or may be condensed with other ring.

Provided is a pneumatic tire having plurality of compound grooves, each including a lateral groove having a first end that communicates with a main groove on one side thereof and a second end that terminates inside a land portion, and further including a sipe that extends from the second end of the lateral groove to the main groove on the other side thereof, are formed at an interval in a tire circumferential direction in at least one row of the land portions positioned inside a center region. The compound grooves are disposed so that an opening direction of the lateral grooves relative to the main grooves alternatingly reverses in the tire circumferential direction. The lateral grooves each include a broad width portion and a narrow width portion.