42results about How to "Excellent high temperature wear resistance" patented technology

The invention discloses a high-temperature-resistant and wear-resistant hard alloy with a NiAl alloying bonding phase. WC and/TiC is used as a hard phase, NiAl alloying Co and/Fe is used as a bonding phase, and the volume ratio of the hard phase to the bonding phase is equal to 10-40%. The preparation method comprises the following steps of: uniformly mixing 0.03-21.04wt% of nickel powder and aluminum powder with carbide powder based on the component proportion of Ni-50at.%Al; placing the mixture in a graphite container to spread out, heating the mixture to 660-1300 DEG C at a non-oxidative atmosphere, preserving heat, and then naturally cooling to obtain a mixture of a carbide and NiAl; grinding, crushing and screening to obtain mixed powder; carrying out deoxidation pretreatment at a hydrogen atmosphere of 400+/-50 DEG C; carrying out wet grinding on 45.77-96.34wt% of mixed powder and the balance of Co and/Fe powder; carrying out spray-drying on the mixed material subjected to wet grinding and pressing; and sintering a compaction in a liquid phase at low pressure at the temperature of 1350-1550 DEG C to obtain the high-temperature-resistant and wear-resistant hard alloy.

The invention discloses high-temperature wear-resisting and corrosion-resisting steel powder for additive manufacturing. The high-temperature wear-resisting and corrosion-resisting steel powder is prepared from the following elements in percentage by weight: 0.1 to 0.3 weight percent of C, 1.0 to 1.5 weight percent of Mn, 0.2 to 0.6 weight percent of Si, 5 to 9 weight percent of Cr, 2.0 to 6.0 weight percent of Ni, 1.0 to 1.5 weight percent of Mo, 0.2 to 0.4 weight percent of V, 0.3 to 0.7 weight percent of Nb, and the balance of Fe, wherein the sum of mass percent of all the elements is 100 percent. A method for additive manufacturing by using the steel powder comprises the following steps of putting the steel powder into additive manufacturing equipment; partitioning a part to be manufactured and setting laser process parameters: output power is 200 to 400W, the spot diameter is 0.06 to 0.1mm, the scanning speed is 960 to 1500mm/s, and track pitch is 0.06 to 1.2mm; then importing partitioned programs into the additive manufacturing equipment; filling the additive manufacturing equipment with high-purity argon; finally, printing layer by layer, and obtaining a high-temperature wear-resisting and corrosion-resisting steel part at last.

The invention discloses a manufacture method of a multilayer gradient nano-composite diamond film of the surface of die steel. The manufacture method includes that a plunger undergoing conventional pretreatment is arranged in a vacuum system of a magnetron sputtering composite vapor deposition system, and multiple layers of gradient films are sequentially deposited. Each layer of the multiple gradient transition layers undergoes high-temperature annealing treatment and argon ion surface etching treatment so as to improve binding force of the films and a base. The defects of high internal stress and poor adhesive force and the like of a conventional diamond film on the surface of the mold steel are overcome.

The invention provides a manufacturing method of metal ceramic coating crystallizer copper plate, belonging to the technical field of continuous casting crystallizer. The invention comprises the following steps: firstly pretreating the surface of the base material; carrying out purifying treatment on the surface of to-be-sprayed workpieces with acetone; carrying out sand spraying and roughening process with 20 meshes of brown aluminium oxide; then adopting the supersonic flame spraying method to spray Cr3C2-25NiCr metal ceramic coating on the surface of a copper crystallizer, coating a layer of brazing filler metal with low melting point mixed with metal ceramics on the metal ceramic coating; finally carrying out remelting treatment in a vacuum furnace, preserving heat for 0.5-2 hours at the temperature of 600 DEG C to 700 DEG C, and cooling to the room temperature by blowing high-pressured nitrogen. The invention has the advantages of ensuring the bonding intensity between the metal ceramic coating and the substrate, lowering the porosity of the coating, and improving the cohesion strength of the coating; the invention further has the advantages of even and compact coating, flat surface, realization of metallurgical bonding with the substrate, good properties of high temperature abrasion resistance and corrosion resistance, and good cold fatigue and hot fatigue resistance properties; the coating can bear the high temperature abrasion of the casting blank surface and the casting blank has lower friction coefficient, thus being beneficial for improving the quality of the casting blank surface and improving the speed of jolleying.

The invention discloses a titanium-based tungstenic alloy material used for 3D printing. The material contains tungsten carbide, nickel, niobium, vanadium, copper, molybdenum and titanium. A preparation method comprises the steps that metal powder is fully mixed after component design is completed; the mixed powder is subjected to sintering and alloy homogenizing; and then alloy powder is obtained through mechanical alloying. A 3D printing finished product of the obtained material has the advantages of being low in weight, high in high-temperature hardness, excellent in high-temperature abrasion resistance, and resistant to corrosion.

The invention discloses a sink roll shaft sleeve which is composed of 0.24%-0.45% of C, 0.60%-2.0% of Mn, 0.80%-1.10% of Si, 0.02%-0.12% of Zr, 0.035%-0.080% of Al, 2.7%-3.5% of Cr, 0.75%-1.60% of Ni, 0.02%-0.03% of Y, 0.5%-2.5% of Mo, 0.03%-0.55% of Nb, 2.5%-3.3% of B, 0.003%-0.01% of N, less than 0.035% of P, less than 0.045% of S and the balance of Fe. By adding the boron element on the basis of the low-carbon high-speed steel, the sink roll shaft sleeve has excellent liquid zinc corrosion resistance on the premise of keeping favorable high-temperature red hardness of the high-speed steel. Besides, proper amounts of yttrium, magnesium, calcium, titanium, niobium and potassium are also added to mainly perform the functions of removing oxygen and sulfur, refining the structure and improving the inclusion morphology and distribution, thereby being beneficial to enhancing the mechanical properties of the sink roll shaft sleeve and especially the obdurability of the sink roll shaft sleeve.

The invention discloses a composite overlaying manufacturing method of a casting roller. The method comprises the steps of 1) manufacturing a base body of the casting roller, and processing the surface of the base body; 2) preheating the base body; 3) sequentially manufacturing a bottom layer and a transition layer in the periphery of the base body by overlaying; 4) overlaying surface covering layer on the surface of the transition layer to form the casting roller, wherein the surface covering layer comprises the following chemical elements and components in percentage by mass: 0.3 to 0.8% of C, 1.0 to 4.8% of Mn, 0.4 to 6.0% of Si, 4.0 to 8.0% of Cr, 0.01 to 1.0% of Ti, 2.0 to 10% of V, 2.0 to 10.0% of W, 1.0 to 6.0% of Mo, 2.0 to 5.0% of Co, 0 to 0.4% of Ca, 0 to 0.4% of Ba, 0 to 0.5% of rare earth element, and the balance of Fe and other inevitable impurities; 5) tempering the casting roller by slowly heating and slowly cooling, wherein the tempering is performed under a temperature of 560 to 600 DEG C.

The invention discloses a preparing method of strengthening molybdenum alloy of pressing mould, inlaid and squeezing mould of copper, other alloys and black metal, which is characterized by the following: adopting TiC as strengthening phase of molybdenum alloy; adding Ti at TiO2 pattern and carbon at carbon black pattern; reducing TiO2 into TiC under high temperature; obtaining the product with high-temperature strength and superior high-temperature abrasion-proof property.

The invention discloses a chain oil composition with excellent high temperature abrasion resistance. The composition is prepared from, by mass, 92%-96% of dipentaerythritol ester, 1%-3% of antioxygen composition, 2%-4% of abrasion resisting agent composition, 0.2%-0.8% of corrosion inhibitor and 0.2%-0.6% of antirust agent. Dipentaerythritol ester is prepared through the steps that pentaerythritol, binary acid and unitary saturated fatty acid react for 12-16 h at the temperature of 160 DEG C to 200 DEG C at the presence of a catalyst, and then reduced pressure distillation, hargil adsorption and filtering are carried out. The antioxygen composition is a composition of diphenylamine antioxygen, naphthylamine antioxygen and an amine antioxygen oligomer. The abrasion resisting agent composition is a composition of phosphite ester, phosphate and dialkyl dithiocarbamic acid molybdenum. Dipentaerythritol ester is adopted as base oil of chain oil, and the advantages of being high in flash point, low in frequency point, high in viscosity index, low in evaporation loss, not likely to coke and the like are achieved. Dipentaerythritol ester is reasonably compounded with an additive, and the high-temperature chain oil composition with the excellent high temperature abrasion resistance is obtained.

The invention relates to a process for performing laser cladding of a superhard high speed steel by hot rolling of a stretch reducing roller of a seamless steel pipe, which is characterized by comprising the following steps: removing oil and rust on the surface of the stretch reducing roller, washing by alcohol, labeling by partitioning a processing area; preparing the superhard high speed steel powder alloy powder, adjusting an automatic powder feeding apparatus so that the alloy powder from an automatic powder feeding head can just fall in a laser molten pool, adjusting the powder feeding amount; selecting a 3.5*1mm broadband integration mirror, and adjusting defocusing amount to make a focused laser spot as an rectangular shape, employing a synchronization powder feeding apparatus for automatically seeding the alloy powder into a laser molten pool, forming an uniform and compact laser cladding layer on the surface; cladding and then performing flaw detection examination, then performing thermal treatment on the stretch reducing roller. The selected superhard high speed steel powder and the stretch reducing roller matrix have good metallurgy and mechanical compatibility, the cladding layer and the matrix can form firm metallurgy combination, hardness is high, thickness is uniform, and crack and spalling phenomena can not be generated.

The invention relates to the technical field of vehicle brakes, in particular to a high-temperature 500-degrees centigrade abrasion-resistant brake pad used for solving the technical problems that a brake pad is high in brake potential safety hazards in a high-speed traveling high-temperature status, meanwhile, abrasion is severe, and the service life is shortened. The brake pad comprises the following raw materials including, by weight, 10-20% of flaky titanium potassium lithium, 5-15% of zirconia, 7-10% of resin, 3-5% of copper fiber, 4-6% of mineral fiber, 2-5% of frictional powder, 1-3% ofrubber powder, 2-5% of aramid fiber, 3-5% of tin sulfide, 3-8% of carbon composite, 3-7% of calcium hydroxide, 2-4% of mica powder and the balance being barium sulfate. According to the brake pad provided by the invention, the new materials of flaky titanium potassium lithium and the zirconia are added to improve the friction material, the friction material is made to have better high-temperatureabrasion resistance, and the service life of the brake pad is greatly prolonged.

The purpose of this heat-resistant sintered material and a production method thereof is to obtain a heat-resistant sintered material that has excellent oxidation resistance, wear resistance at high temperatures, and salt damage resistance. This heat-resistant sintered material is characterized by: having a composition that contains, in mass%, 25-50% of Cr, 2-25% of Ni and 0.2-1.2% of P, with the balance made up of Fe and unavoidable impurities; and having a structure that comprises an Fe-Cr matrix and hard phases that are dispersed within the Fe-Cr matrix and are composed of Cr-Fe alloy grains. This heat-resistant sintered material is also characterized in that: the Cr content in the Fe-Cr matrix is 24-41% by mass; the Cr content in the hard phases is 30-61% by mass; and the intercommunicating porosity is 2% or less.

The invention discloses a treatment method for improving wear resistance of a mold. The treatment method comprises the following steps of (1), surface pretreatment; (2), coating treatment; (3), quenching treatment. By means of the treatment method for improving the wear resistance of the mold, the treated mold has quite good high-temperature wear-resistant stability, the mold repairing rate of thetreated mold is obviously reduced, the service life of the treated mold is obviously prolonged, the surface performance of prepared products is better, and the treatment method for improving the wearresistance of the mold has high use and popularization values.