37results about How to "Repressive" patented technology

The invention relates to a composite material of a high-entropy alloy holding abrasive particle as well as a preparation method and application thereof, and belongs to the technical field of high-entropy alloy application. The high-entropy alloy holds the abrasive particle in a tyre body form. The high-entropy alloy is prepared from the following ingredients through being metered by atomic percentage: 10 to 30 percent of Fe, 10 to 30 percent of Co, 10 to 30 percent of Cr, 10 to 30 percent of Ni, 10 to 30 percent of Cu and 0 to 8 percent of Mo. The preparation method is characterized in that after the high-entropy alloy raw material powder is prepared and taken according to the designed ingredients, high-entropy alloy powder is prepared by a gas atomization method and a mechanical alloyingmethod; then, a SPS process is combined; the composite material with excellent performance is obtained. The composite material is particularly suitable for being used for manufacturing a cutter head.The high-entropy alloy is used as a tyre body for holding abrasive particles for the first time; the ingredient design is reasonable; the preparation process is scientific and controllable; the performance of the product is excellent; the large-scale industrial application is convenient.

The invention provides a gear shaft sleeve which is formed by machining gear shaft sleeve blank (1). The gear shaft sleeve is formed by the following components in a cold pressing mode, the ingredients comprise 0.6%-1.2% of carbon, 1.3%-1.7% of copper, 1.55%-1.95% of nickel, 0.4%-0.6% of molybdenum, 0.3%-0.5% of AncorMax200 and the balance iron. The machining method of the gear shaft sleeve includes the steps that the components required by a formula are weighed and mixed evenly; when a pressing machine is in a loose state, materials to be pressed are added into a material cavity, the size of the material cavity is three times of the size of the gear shaft sleeve blank (1); when the pressing machine is in a pressing state, the materials to be pressed are formed in a cold pressing mode; when the pressing machine is in a demoulding state, the finished gear shaft sleeve blank (1) is output; machining such as numerical control lathe machining, 30-degree big chamber chambering, large outer circle clamping and small outer circle turning is conducted. The density of the gear shaft sleeve obtained through the method can reach 6.9-7.0 g / cm<3>, and the overall quality is high.

The invention discloses a preparation method of iron-silicon-chromium soft magnetic powder. The steps of the preparation method are as follows: 1) adding iron-silicon-chromium soft magnetic alloy powder raw materials into an intermediate frequency induction furnace, and smelting in the atmosphere to obtain alloy liquid; 2) under the condition of nitrogen protection Then, the alloy liquid is sent to the atomization tower. During the feeding process, the two atomization media, ultra-high pressure atomized water and low-pressure vortex gas, act on the alloy liquid at the same time, and the alloy liquid is strongly broken into a large number of small metal melts. drops, and then cools and solidifies into Fe-Si-Cr soft magnetic alloy powder. It can prepare Fe-Si-Cr alloy powder with high bulk density, high tap density, low oxygen content, high inductance value and magnetic permeability. It can be widely used as a raw material for miniature inductors.

The invention relates to a method for preparing nickel-coated powder by carbonyl vapor deposition. First, under normal pressure and 40-100°C, carbon monoxide reacts with active metal nickel to generate a carbonyl nickel liquid; then the carbonyl nickel liquid is heated to 150-100°C. At 300°C, the nickel carbonyl liquid is vaporized into nickel carbonyl gas; finally, the nickel carbonyl gas is mixed with the carrier gas, loaded into the vibrating pyrolysis coating furnace, and reacts with the coated material in the vibration pyrolysis coating furnace, and the nickel carbonyl The gas thermally decomposes and deposits metallic nickel on the surface of the coated material to obtain nickel-coated powder; the nickel coating method in the present invention has high selectivity, and the powder produced by this method has large surface area, high purity, uniform particles, and dispersed Good resistance, high chemical reactivity and activity, and has excellent compressibility and sinterability.

A method for preparing a powder metallurgy aluminum alloy phaser rotor, the steps of: mixing aluminum powder, high-alloy mother powder, copper powder, nickel powder and an organic lubricant according to the following mass ratios: copper 1.8-3.0%, magnesium 1.0-2.0% %, iron 1.0-1.5%; nickel 0.8-2.0%, silicon 0.1-0.5%, organic lubricant: 0.8-1.5%, no more than 2% of unavoidable impurities, and the balance is aluminum; powder metallurgy green body obtained by pressing , then sintering, solution quenching, repressing finishing, aging treatment, and finally turning the rotor to meet the final size requirements. Compared with the rotor made of sintered steel, the present invention has better pressing performance, faster speed and lower pressing cost; the temperature of sintered aluminum alloy is much lower than that of sintered steel, the energy consumption in the sintering process is reduced, and the processing performance of the powder metallurgy aluminum rotor is better Well, there is no need for surface protection treatment during transportation and storage; compared with die-casting or extruded aluminum alloy rotors, powder metallurgy is a near-net-shaping technology, with high utilization of aluminum alloy raw materials, high production efficiency, and low production costs Low.

The invention discloses Mn-contained mixture steel powder for powder metallurgy and a preparing method. The Mn-contained mixture steel powder is composed of water atomization pure iron powder, Mn-contained water atomization pre-alloyed steel powder, FeMn alloy powder, graphite powder and a lubricant, wherein the mass percentage content of Mn is lower than or equal to 3%. The preparing method includes the steps of preparing the components and mechanically and evenly mixing the components. The pressing performance and the sintered density of the prepared mixture steel powder are superior to the pressing performance and the sintered density of the Mn-contained water atomization pre-alloyed steel powder with the same components, and compared with a finished product obtained by sintering conventional Mn-contained mechanical mixture powder with the same contents, a sintered finished product is lower in oxygen content and high in density. The content of the Mn can be as high as 3%. The Mn-contained mixture steel powder is reasonable in component matching and high in Mn content, the prepared Mn-contained mixture steel powder combines the advantages of even Mn-element distribution in the Mn-contained pre-alloyed steel powder and the good pressing performance of the conventional Mn-contained mechanical mixture powder, the pressing performance is good, the sintered finished product is low in oxygen content and high in density, and the Mn-contained mixture steel powder is suitable for industrial production.

The invention belongs to the field of high-entropy alloy materials, and discloses an AlCrFeNiSiTi high-entropy alloy porous material and a preparation method thereof. The AlCrFeNiSiTi high-entropy alloy porous material of the present invention comprises Al: 10%-20%, Cr: 10%-20%, Fe: 10%-20%, Ni: 10%-20%, Si: 10%-20% according to atomic percentage 20%, Ti: 10%-20%, using the reaction synthesis method of element powder to prepare AlCrFeNiSiTi high-entropy alloy porous material, using the element powder of each principal element as raw material, only a small amount of lubricant needs to be added during the preparation process, which can Low consumption and low cost; make full use of the Kirkendall effect caused by partial diffusion between elements to generate pores, the controllability of the pore structure is good, and there is no need to add pore-forming agents, and there is no problem of subsequent removal of pore-forming agents. It has the characteristics of short process and high performance.