144results about How to "Improve high temperature wear resistance" patented technology

The invention relates to a lubricant composition for a gasoline engine. The lubricant composition contains: by mass, less than or equal to 0.08% of phosphorus and less than or equal to 0.9% of sulfate ash. The lubricant composition comprises A) a composite antioxidant comprising at least ingredients of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant and/or a boronized polyisobutylene succinimide dispersant, C) one or more alkaline earth metal salicylate cleaning agents, D) at least one zinc dialkyl dithiophosphate, E) one or more oil-soluble organic molybdenum friction modifiers, F) one or more ashless friction modifiers, and G) a main amount of lubricating base oil. The lubricant composition for a gasoline engine has synergistic effect of the additives, can satisfy antioxidation requirements of a high-grade gasoline engine lubricant, and has excellent piston cleanliness, wear resistance and a viscosity increasing control capacity.

A copper-base crystallizer surface laser cladding method is characterized in that the method comprises the following steps in sequence: (1) preparing a nickel-base transition layer with thickness of 0.3-0.5mm; (2) melting the transition layer by using a mixing mode CO2 laser beam; (3) preparing a nickel-base or cobalt-base alloy work layer with thickness of 0.6-1.0mm by ultrasonic spraying; (4) melting transition layer by using the mixing mode CO2 laser beam; and (5) processing a laser cladding layer into a smooth surface. By the method of the invention, excellent metallurgically bonded cladding layers are formed on copper-base materials. The hardness and wearing resistance experiments show that the hardness of the work layer is above Hv350, which is improved by more than 3 times compared with the hardness of copper alloy; the wear loss of the laser cladding nickel-base or cobalt-base work layer is about 10mg and the high temperature wearing resistance is over 5 times as high as that of the copper alloy, thus having the effect of strengthening the copper alloy. The method of the invention is suitable for not only strengthening the copper-base crystallizer but also strengthening various copper-base alloy surfaces.

The invention relates to a lubricant composition for a diesel engine. The lubricant composition for a diesel engine contains less than or equal to 0.09% by mass of phosphorus, less than or equal to 0.4% by mass of sulfur and less than or equal to 1.0% by mass of sulfate ash. The lubricant composition for a diesel engine comprises A) a composite antioxidant comprising at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant and/or a boronized polyisobutylene succinimide dispersant, C) a mixture of magnesium sulfate and sulfurized calcium alkyl phenate, D) at least one zinc dialkyldithiophosphate, E) one or more ashless friction modifiers, and F) a main amount of lubricating base oil. The lubricant composition for a diesel engine has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a diesel engine, and has excellent piston cleanliness, wear resistance and a viscosity increasing control capacity.

The invention relates to a hard surfacing sintered flux and a manufacturing method thereof. The sintered flux comprises MgO of 30 percent to 50 precent, CaO of 2 percent to 10 percent, Al2O3 of 10 percent to 20 percent, CaF2 of 18 percent to 28 percent, SiO2 of 10 percent to 20 percent, SiC of 0 percent to 1.5 percent and other components of 0 percent to 5 percent such as ferroalloy mainly playing a role of desoxidation and the like. Material preparation, dry mixing and wet mixing by adding soluble glass into a blender are conducted until granules which have the required sizes are formed, then the granules are dried in a rotary drying way at the low temperature of 200 DEG C to 250 DEG C, and then finished products are obtained by high-temperature sintering in a rotary drying oven at the high temperature of 700 DEG C to 750 DEG C, sieving and packaging. The invention has low flux cost so as to meet the requirements of different hardness, excellent technique and good high-temperature slag detachability; the deposited metal has no gas hole, no crackle but adjustable hardness; and the high-temperature wear-resistance, oxide etch resistance and cold and thermal fatigue resistance of a hot roll are greatly improved.

The invention relates to a lubricant composition for a gas engine. The lubricant composition contains: by mass, less than or equal to 0.08% of phosphorus and less than or equal to 0.8% of sulfate ash. The lubricant composition comprises A) a composite antioxidant comprising at least ingredients of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a dispersant, C) one or more sulfurized alkaline earth metal alkyl phenolate cleaning agents, D) at least one zinc dialkyl dithiophosphate, E) one or more ashless friction modifiers, F) one or more metal deactivators and G) a main amount of lubricating base oil. The lubricant composition for a gas engine adopts optimized combination of the multiple ashless antioxidants, is blended with the appropriate clearing agent and the dispersant, has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a gas engine, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.

The invention provides a SiC particle-enhanced aluminum based composite with high-temperature wear resistance and a preparation method of the SiC particle-enhanced aluminum based composite and belongsto the field of aluminum alloy materials. The preparation method comprises the following steps of smelting industrial pure aluminum, aluminum-silicon alloy, aluminum-copper alloy, pure magnesium, thealuminum-copper alloy, aluminum-nickel alloy, aluminum-zinc alloy, aluminum-titanium alloy and aluminum-magnesium alloy at 700-800 DEG C according to a mass ratio; performing degassing refining; performing casting at 700-750 DEG C; using vacuum smelting, stirring and casting equipment to smelt a substrate at 700-800 DEG C; adding micron-size SiC particles; performing semi-solid state stirring at550-570 DEG C; performing casting at 700-750 DEG C; and performing T6 heat treatment. For the SiC particle-enhanced aluminum based composite with the high-temperature wear resistance and the preparation method, the substrate alloy components are designed self according to an alloy phase diagram, and a proper element content is selected, so that a high temperature resistant hard phase occurs aftersubstrate alloy heat treatment, and the substrate hardness at high temperature is ensured; and meanwhile, by adding an SiC-enhanced phase, the high temperature resistance of the composite is further improved.

The invention relates to a lubricant composition for an intermediate-speed trunk piston-type engine of a ship. The lubricant composition comprises A) a composite antioxidant composing at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant, C) a mixture of magnesium sulfate and sulfurized calcium alkyl phenate, D) at least one zinc dialkyldithiophosphate, E) dialkyldithiocarbamate, F) one or more metal deactivators, G) one or more ashless friction modifiers, and H) a main amount of lubricating base oil. The lubricant composition utilizes optimized combination of the multiple ashless antioxidants, is compounded with the appropriate clearing agent and the dispersant, has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for an intermediate-speed trunk piston-type engine of a ship, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.

An antiwear high-Fe Al-base welding wire for build-up welding contains Si (11-13 wt.%), Cu (0.5-1.5), Mg (0.4-1.0), Mn (0.3-0.9), Fe (3-5), Ni (3-5), RE (0.2-0.4) and Al (rest). Its advantages and high welding performance and hardness of welded seam, good antiwear nature, and low cost.

The invention relates to a lubricant composition for a methanol engine. The lubricant composition comprises A) a composite antioxidant comprising at least ingredients of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant and/or a polyisobutylene succinate dispersant, C) a mixture of magnesium sulfonate and sodium sulfonate, D) at least one zinc dialkyl dithiophosphate, E) one or more oil-soluble organic molybdenum friction modifiers, and F) a main amount of lubricating base oil. The lubricant composition for a methanol engine utilizes optimized combination of the multiple ashless antioxidants, is compounded with the appropriate clearing agent and the dispersant, has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a methanol engine, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.

The invention discloses a preparation method of a wear-resistant molybdenum alloy. The preparation method comprises the following steps: firstly, preparing a solutions by taking aluminium nitrate, citric acid and ammonium molybdate as raw materials, mixing the solutions to solate and gelate, and drying and roasting the gel to obtain Al2O3/MoO3 mixed powder; secondly, carrying out hydrogen reduction on the Al2O3/MoO3 mixed powder; thirdly, ball-milling the Al2O3/MoO3 mixed powder by use of a planetary ball mill; and finally carrying out hot pressed sintering to obtain the molybdenum alloy. The preparation method has the following beneficial effects: in the prepared molybdenum alloy, the alumina and molybdenum grains are very fine, the molybdenum grain size is 0.8-1.8 microns and the alumina grain size is 100-300 nanometers; the recrystallization temperatures of the prepared molybdenum alloy can be about 1550 DEG C; the high-temperature wear resistance and tensile strength of the molybdenum alloy are improved by 5-9% and 3-10% respectively compared with those of molybdenum base composites in CN101698919A; and the density and microhardness of the prepared molybdenum alloy are obviously improved, thereby achieving the aim of improving the high-temperature wear resistance of the wear-resistant molybdenum alloy.

The invention discloses a metal-based material for the preparation of a crystallizer or a tuyere and belongs to the technical field of surface engineering. According to the metal-based material, a transition layer is innovatively arranged between a Cu or Cu alloy matrix and a high-abrasion-resistance working layer by the adoption of a metallurgical bonding method, and made of at least one of pureCo metal, pure Ni metal, pure Cr metal, pure Cu metal, pure Mo metal, pure Ag metal and a NiCr or MCrAlY alloy; through the transition layer, the functions of improving the laser absorption rate, lowering the matrix heat conductivity, and lowering the dilution rate can be achieved; due to the existence of the transition layer, the thickness of the working layer can be adjusted within a range of 0.01-3 mm and the formation of surface cracks can be avoided; furthermore, the ratio of the thickness of the transition layer to that of the high-abrasion-resistance working layer is 1:(1-3), so that the perfect bonding of the transition layer and the high-abrasion-resistance working layer can be guaranteed within the ratio range; the formation of a high-abrasion-resistance coating or coating product which is free of surface cracks and subjected to metallurgical bonding on the Cu or Cu alloy matrix can be improved; the reliability of the crystallizer or the tuyere can be improved; and the service life of the crystallizer or the tuyere can be prolonged.

The invention discloses a wear resistant surfacing alloy containing ceramic phase with molybdenum and chromium elements and a production technology thereof. The wear resistant surfacing alloy containing the ceramic phase with the molybdenum and chromium elements is characterized in that alloy composition comprises 15 to 30 % of chromium, 3 to 12 % of molybdenum, 0.5 to 1 % of nickel, 6 to 10 % of carbon and the remaining is ferrum and unavoidable impurities. The production technology of the wear resistant surfacing alloy containing the ceramic phase with the molybdenum and chromium elements comprises mechanically mixing ferrochrome powder, molybdenum powder, nickel powder, graphite and reduced iron powder; uniformly mixing through a dry type ball mill of a ball grinder; coating the powder on a carbon steel plate after the powder is cooled; uniformly mixing into a coating layer with the thickness of 4 mm through water glass; standing under room temperature; drying in a drying oven; enabling the temperature to be cooled to the room temperature in the drying oven; performing ion surfacing. The production technology of the wear resistant surfacing alloy containing the ceramic phase with the molybdenum and chromium elements has the advantages of being simple in technological process, less in added alloy variety and low in cost and enabling hard phase of obtained alloy surfacing layer to be good in bonding performance with base materials, not easy to fall off, high in rigidity and wear resistance, obvious in adhesive wear resistant effect compared with other iron-based surfacing wear resistant alloy.

A laser clad Co-based WC coating is disclosed. Co-based WC composite powder is subjected to laser cladding on a surface by adopting a semiconductor laser. The microhardness and high-temperature wear resistance of the coating after laser cladding are improved to a large extent. The major constitution phases of the coating are a supersaturated solid solution Co, and hard phases including CoCx, Fe<3>W3C, (Cr,Fe)<23>C6, and the like. In a wear process of the coating at a high temperature of 600 DEG C, on the one hand, a Co-rich area which is relatively low in hardness is worn firstly so that carbide hard phases having high hardness are shown on the surface and wearing action of a material is prevented; and on the other hand, Co and Cr elements promote formation of CoO and CoO.Cr2O3 oxide filmshaving lubricating functions in a high-temperature friction process so that the friction coefficient is reduced, and therefore high-temperature wear resistance of the clad layer is increased by about2 times. High-temperature wear mechanisms of the clad layer mainly include abrasive particle wear and adhesive wear.

The invention discloses a continuous-casting flow-control refractory material and application thereof. The continuous-casting flow-control refractory material comprises the following components in parts by weight: 24-30 parts of white alundum, 29-35 parts of brown fused alumina, 9-11 parts of electrofused zirconium mullite, 18-22 parts of zirconium dioxide, 3-5 parts of active aluminum oxide, 4-6 parts of flake graphite, 0.5-1.5 parts of silicon carbide and 5-7 parts of binder. The high strength, high-temperature erosion resistance, high-temperature wear resistance, peel resistance and other requirements of the continuous-casting flow-control refractory material are ensured, and the flow control time can be further prolonged. The continuous-casting flow-control refractory material is especially suitable to be used as continuous-casting flow-control functional components of long nozzles and bowl parts thereof, brick cups and bowl parts thereof, and the like.

The invention relates to a lubricant composition for a crosshead ship engine crankcase system. The lubricant composition comprises A) a composite antioxidant comprising at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) polyisobutylene succinimide, C) a mixture of magnesium sulfonate and calcium sulfonate, D) at least one zinc dialkyl dithiophosphate, E) one or more dialkyl dithiocarbamates, F) one or more metal deactivators, and G) a main amount of lubricating base oil. The lubricant composition adopts optimized combination of the multiple ashless antioxidants, is blended with the appropriate clearing agent and the dispersant, has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a crosshead ship engine crankcase system, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.

The invention discloses TiB2-Ni-based metal-ceramic composite feed for thermal spraying and a preparation method of the TiB2-Ni-based metal-ceramic composite feed. The preparation method comprises thefollowing steps: (1) in a protective atmosphere, adding TiB2 powder and Ni-based alloy powder into a stirring grinder, adding a process control agent, a binding agent and a grinding medium, and thencarrying out grinding, so as to obtain slurry of composite powder A; (2) carrying out spray granulation on the slurry of the composite powder A in a spray drying system, so as to obtain composite powder B; (3) carrying out heat preservation on the composite powder B in drying equipment, so as to obtain composite powder C; and (4) passing the composite powder C through a spheroidizing system, so asto obtain high-sphericity composite powder. The powder prepared through the preparation method disclosed by the invention is high in flowability and excellent in performance; the demand of thermal spraying equipment for the powder flowability can be met; the problem that nanometer metal-ceramic composite powder is hard to spray can be solved; and the improvement of the coating surface performancecan be facilitated.

The invention relates to novolak phenolic resin microspheres and a preparation method thereof, and belongs to the field of chemical synthesis. The microspheres consist of the following components in part by weight: 80 to 100 parts of absolute ethanol, 95 to 105 parts of phenol, 100 to 115 parts of formaldehyde, 6 to 12 parts of triethylenetetramine, 2 to 6 parts of boric acid and 1 to 1.75 parts of polyvinylpyrrolidone. The method comprises the following steps of: sequentially feeding the reactants with heating, reacting for a certain period of time, cooling, discharging, precipitating, performing centrifugal separation, and drying. The novolak phenolic resin microspheres prepared by the method have high dispersibility, have the particle size of 5 to 50mu m, are easily mixed with other aids uniformly, have the thermal decomposition temperature of more than 450 DEG C after being cured, and have high toughness, moisture absorption property and strength; and the preparation process is short, easy to operate and low in cost, and products can be used for an organic friction material, a molding compound, a grinding wheel bonding material, a thermal insulation material, a fireproof material and the like, so the microspheres can replace the traditional phenolic resin.

The invention relates to a laser-cladding repairing process for a centering roller. The abraded surface of the centering roller is repaired through modified laser cladding, meanwhile, the corrosion and abrasion resistance performance of the centering roller is improved, and the service life and the replacement cycle of the centering roller are effectively prolonged. The process comprises the following steps of (1) surface treatment on the centering roller needing repairing, (2) clamping and aligning, (3) laser-cladding repairing and (4) detection, flaw detection and machining. Compared with the prior art, the laser-cladding repairing process has the beneficial effects that (1) compared with a traditional cladding mode, a cladding layer formed by modified cladding is basically uniform in thickness, the cladding efficiency is improved by 10-20 times, and the production cost is low; (2) the bonding strength of a base body and the laser cladding layer is not lower than 90% of that of an original base material, and the cladding layer and an interface of the cladding layer are compact in structure, fine in grain and free of the defects of holes, slag inclusion, cracks and the like; (3) the surface hardness of a repaired layer is HV450-550, and the repaired centering roller has better high-temperature abrasion resistance performance, high creep limit, good endurance strength and better thermal fatigue and breakage resistance performance.

The invention discloses a method for prolonging the service life of a hot forging die. The die is sequentially subjected to the technologies of forging and pressing, annealing, quenching, tempering and laser cladding. According to the method, the die heat treatment technology and the laser cladding technology are combined, and a brand new die hot forging method is formed; by utilization of the heat treatment technology, forging inner stress is eliminated, grains are refined, and die hardness uniformity is promoted; and by utilization of the laser cladding technology, a cladding layer excellentin abrasion resisting performance is formed, influences of conventional abrasion on the service life of the die are weakened, the service life of the die is prolonged, and the enterprise operating cost is reduced.

The invention provides a preparation method of a functional graded friction stir welding stirring head. According to the preparation method, high-temperature wear resistant materials are adopted in friction positions with workpieces, i.e. the surfaces of a stirring pin and a shaft shoulder; materials with good toughness, high strength and good economy are adopted in non-contact positions of the center of the stirring pin and the end surface of the shaft shoulder, and finally, a laser near net forming mode is adopted so as to realize graded transition of the two materials and near net forming of the stirring head. According to the laser near net forming method of the functional graded friction stir welding stirring head, the stirring pin and the shaft shoulder which make direct contact withmetal when the stirring head is operated can have good high-temperature wear resistant performance, and the whole stirring head has the advantages of good toughness, high strength and good economy. Compared with traditional tool steel and die steel, the laser near net forming method has the advantages that the application range of a stirring tool is enlarged, and the service life is prolonged; compared with a tungsten-based stirring head and a polycrystalline cubic boron nitride stirring head, the laser near net forming method has the advantage that the whole fracture toughness and the manufacturing economy of the stirring head are greatly increased.

The invention relates to a lubricant composition for a railway high-speed diesel engine. The lubricant composition comprises A) a composite antioxidant comprising at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant and/or a polyisobutylene succinate dispersant, C) a mixture of calcium sulfonate and calcium naphthenate, D) at least one extreme pressure anti-wear agent, E) one or more ashless friction modifiers, and F) a main amount of lubricating base oil. The lubricant composition has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a railway high-speed diesel engine, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.