104results about How to "High degree of alloying" patented technology

The invention relates to an equal-passage variable-cross-section extruding mold and an extrusion forming method for pipes. The equal-passage variable-cross-section extruding forming is adopted, so the extruding forming of the pipes is formed through the twisting shearing deformation and the upsetting deformation on the cross section, and the combination of various deformation modes in one extruding process is realized. The pipe walls are in a strong three-direction press stress state through being limited by die cavities and polyurethane foam filling agents, in the deformation stage of circle-ellipse-circle and ellipse twisting change, materials enter twisting shearing deformation zones of the metal transition regions, the material internal tissues generate rotation and shearing stress under the effect of the shearing stress, the orientation of the material tissue structure is caused, i.e. a new tissue structure is formed, and the material tissue structure under the same deformation degree is improved. The mold and the method have the advantages that deformation degree higher than that of the traditional forming process can be obtained, the strain distribution and the stress distribution inside the pipes are improved, residue casting tissues of the pipes can be favorably crushed, the forms and the distribution of inclusions are changed, and the internal tissue defects of the pipes are eliminated.

The invention discloses a reinforced friction material of copper-based particle in the friction material making domain, which comprises the following parts: 30-70% Cu, 4-11% Sn, 1-15% Al, 5-18% Fe, 2-15% Al2O3, 2-15% SiO2, 0-15% ferrochrome and 5-20% graphite.

The invention relates to a method for preparing a CuNiSiAl elastic copper alloy, comprising the steps of fusion casting, homogenizing treatment, hot rolling, solid solution treatment, cold rolling, ageing treatment, secondary cold rolling, etc. The alloy has reasonable components, high alloying degree, simple production process and low production cost and is convenient to operate. Compared with beryllium bronze, the alloy produced by the invention has the advantages of high strength, good conductivity, high stress relaxation resistance and no toxic elements such as beryllium. The CuNiSiAl elastic copper alloy prepared by the invention has ultrahigh strength and high stress relaxation resistance and can be suitable for the high performance conductive elastic devices in the aerospace and microelectronics industries, such as high power hermetically sealed electromagnetic relays, etc.

The invention relates to a method for preparing a high-alloying carbon-supported PdFe nanocatalyst by an in-situ reduction method. The method comprises the following steps of: adding a soluble Pd<II> salt to a carbon support suspension, adding an Fe(CN)6<3-> or Fe(CN)6<4-> solution at 30-100 DEG C, controlling the mol ratio of the Pd<II> salt to the Fe(CN)6<3-> to be 1.5:1 or the mol ratio of the Pd<II> salt to the Fe(CN)6<4-> to be 2:1; fully stirring the mixture solution to obtain a component A, namely carbon-supported iron palladium prussiate or ferrous iron palladium prussiate nanoparticles; adding a reducing agent to the component A, fully stirring, reducing the nanoparticles in situ to obtain a component B; and washing with water and drying the component B to obtain the high-alloying carbon-supported PdFe nanocatalyst. The catalyst provided by the invention has obviously improved electrocatalytic performance on oxygen reduction and presents excellent electrocatalytic activity and stability. The preparation method provided by the invention is simple, economical and suitable for industrial large-scale production.

The application of an electro-catalyst in an anode of a proton exchange membrane fuel cell is the application of the electro-catalyst in the anode of the proton exchange membrane fuel cell. The catalyst has the following characteristics: taking PdxPty alloy and the added one or more types of IIIB, IVB, VB, VIB, VIIB, VIII and IB group as active ingredient, wherein the content of the active ingredients accounts for 5%-70% of the weight of the catalyst, the rest is conductive carrier, the content of the Pd metal accounts for 50%-95% of the total weight of the metal. In the preparation method, a liquid phase reduction method is adopted, the main active ingredient Pd metal precursor is dissolved in a mixture solution of water and alcohol, ammonia water to be used as a complexing agent is added, and then other active ingredient precursors and conductive carriers are added; and the active ingredients can be reduced by a strong reducing agent and then the electro-catalyst is loaded on the conductive conductor.

The invention discloses a reinforced friction material of copper-based particle in the friction material making domain, which comprises the following parts: 30-70% Cu, 4-11% Sn, 1-15% Al, 5-18% Fe, 2-15% Al2O3, 2-15% SiO2, 0-15% ferrochrome and 5-20% graphite.

The invention discloses a tube drawing forming method and forming mould. In the forming method, extrusion-bulging deformation is performed on a tube by using a drawing torsion variable-section core to realize combination of various deformation modes in a primary forming process. The tube wall of the formed tube is subjected to the extrusion-bulging of the core and is in a strong three-way compressive stress state due to the limitation of a polyurethane filling layer; at a deformation stage of circular-elliptical-circular and elliptical torsion change, the tube enters a torsion shearing deformation zone of a metal transition region; under the action of shearing stress, the internal organization of the material is subjected to rotation and shear strain to cause the orientation of a materialorganization structure, namely a new texture is formed, thereby improving deformation texture under the equivalent deformation degree. The drawing variable-section core extrusion-bulging tube deformsto achieve larger deformation degree compared with that of the conventional forming process, so that strain distribution and stress distribution in the tube are improved, the casting organization remained in the broken tube is facilitated, the form and the distribution of inclusion are changed, and the defects of the internal organization of the tube are overcome.

The invention belongs to the technical field of new energy materials and application, and particularly relates to a high-temperature preparation method of a proton exchange membrane fuel cell binary alloy catalyst. The preparation method comprises the following steps: (1) mixing and stirring a transition metal precursor solution and a platinum-carbon catalyst suspension to fully disperse; (2) adding a precipitant solution and a reducing agent solution into a mixed solution dispersed in step (1), adjusting the pH value of the mixed solution to 9-13, centrifuging or filter-pressing and washing for multiple times after complete precipitation, and fully drying to obtain catalyst precursor powder; and (3) roasting the catalyst precursor powder at high temperature, cooling, pickling, and dryingto obtain catalyst powder. The transition metal element and the platinum catalyst are used for forming the binary alloy catalyst, the cost of the catalyst can be reduced, after the transition metal and platinum form an alloy, crystal lattices of platinum shrink, and the adsorption energy of the surface to oxygen is reduced, so the catalytic activity of the oxygen reduction reaction is improved.

The invention discloses a manufacturing method of a high-strength antirust aluminum alloy slab ingot and relates to a manufacturing method of an aluminum alloy slab ingot. The manufacturing method solves the problems that a core of an existing composite material is mainly a 3003 alloy, but the 3003 alloy hardly meets the requirements of the current market on the high-performance composite material due to low alloying degree and low strength. The method comprises the following steps: 1, melting, and 2, forming, so that the high-strength antirust aluminum alloy slab ingot is obtained. The manufacturing method is used for manufacturing the high-strength antirust aluminum alloy slab ingot.

The present invention relates to production of zinc alloy. The technological scheme of producing Zn-Bi alloy includes first compounding intermediate alloy with alloy ingot and RE ingot at the smelting temperature of 750-850 deg.c, subsequent smelting zinc ingot at 550-650 deg.c and adding nickel material and final adding bismuth ingot to form the polynary Zn-Bi alloy. The said process can avoid the burning loss of RE metal to avoid waste, may have certain amount of Al-RE intermediate alloy added to form different alloys, and has smelting and stirring time over 15 min to reach effect of homogeneous mixing. The present invention uses preferably inducing furnace as smelting apparatus and the product has stable and homogeneous alloy element components, high alloy element utilization and clean and environment friendly production process.

The invention provides a method for preparing an alloy nanoparticle. The method utilizes good SPR properties and local heating ability of precious metal materials and heat insulation and original shape maintaining functions of SiO2 nano layers, so that different metal atoms in a multi-metal structure of a core-shell structure migrate to form the multi-metal alloy nanoparticle with constant morphology. The method uses sunlight or simulated sunlight as a light source without the need for other energy sources, the method is green, environmentally friendly and simple and quick to operate, completely alloyed nanoparticles of various morphologies can be prepared, and the prepared alloy nanoparticle has good dispersion performance, uniform size and excellent stability.

The invention relates to an Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy which is prepared from the following components in percentage by mass: 10-12 percent of Zn, 2-3 percent of Mg, 0.5-1.5 percent of Cu, smaller than 0.2 percent of a total amount of Fe and Si, smaller than 0.2 percent of impurity and the balance of Al. A preparation method for the Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy comprises the following steps of step 1, adding industrial pure aluminum in a crucible resistance furnace for heating and complete melting according to the mass percentage, and then sequentially adding a Cu source, a Zn source and an Mg source until all the materials are thoroughly molten; step 2, performing stirring, refining with degassing and slag skimming; step 3, spraying a prepared metal liquid to a copper roller to prepare a strip; step 4, performing cold isostatic pressing on the strip obtained through rapid solidification to obtain a cold-pressed blank; step 5, performing hot extrusion on the cold-pressed blank to obtain an extruded rod; and step 6, finally, performing heat treatment on the extruded rod. By adopting the technical method provided by the invention, the process flow is simplified, the material utilization rate is high, and the Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy has high strength and shaping and has a good application prospect in the fields of aerospace, automobiles and the like.

The invention belongs to the technical field of fuel cells, and particularly relates to a platinum-cobalt alloy carbon catalyst for a proton exchange membrane fuel cell and a preparation method of the platinum-cobalt alloy carbon catalyst. The preparation method of the platinum-cobalt alloy carbon catalyst comprises a pretreatment process and a reaction process. The obtained crude platinum-cobalt alloy catalyst is subjected to post-treatment, a post-treatment solution A is added into the crude platinum-cobalt alloy catalyst during post-treatment, after treatment is conducted for 0.5-200 h at the temperature of 0-80 DEG C, part of a solvent is removed, then a post-treatment solution B is added, after continuous treatment is conducted for 0.5-200 h at the temperature of 0-80 DEG C, washing is conducted, and drying at 20-85 DEG C is conducted to obtain the platinum-cobalt alloy carbon catalyst. According to the prepared crude platinum-cobalt alloy catalyst, unalloyed elements and impurities on the surface of the catalyst can be removed through post-treatment, raw materials used in the preparation process are environmentally friendly, the preparation technology is high in operability, and commercialization is easy to achieve; and the prepared platinum-cobalt alloy catalyst is excellent in catalytic activity, good in oxygen reduction performance and high in power density when applied to a single battery.

The invention discloses a low-cost and long-service-life surface layer gradient material with stainless steel performance. The surface layer gradient material comprises a surface layer gradient structure with stainless steel performance. The grain size of the surface layer gradient structure is gradually increased from the surface to the core part to be the same as the grain size of a base body. The solid solubility and the carbide content of the surface layer gradient structure are gradually reduced from the surface to the core part. The solid solubility and the carbide content of the surface layer gradient structure are gradually reduced from the surface to the core part. An ideal micro-nano gradient structure is formed through the surface pretreatment, preset metal powder, large stress-strain impact deformation treatment and returning treatment, the alloying degree and the alloying depth of the surface layer gradient material are obviously improved, no obvious interface exists between the gradient layer and the base body, and transition is continuous. The technology is simple, production is safe, and cost is low. 80-85% of material surface layer alloy elements are converted into a solid solution, 15-20% of material surface layer alloy elements are converted into carbide, and the alloying depth is larger than 300 microns. The corrosion resistance of the material is obviously improved, the service life of the material is obviously prolonged, and the corrosion resistance and the service life of the surface layer gradient material are equivalent to the stainless steel performance.

Disclosed is a CuNiSi system elastic copper alloy with ultra high strength and high conductivity as well as a method for the production thereof, having (in weight percent ): Ni: 6.4 to 8.2wt percent; Si: 1.2 to 1.8wt percent; Sn: 0.3 to 0.5wt percent; Mg: 0.1 to 0.2wt percent; Zr: 0.1 to 0.2wt percent; and balance Cu, and the method for the production thereof comprises five steps of: (1) CuNiSi non-vacuum secondary remelting and ingot casting; (2) homogenizing treatment and hot rolling; (3) twin-stage solution treatment; (4) cold rolling; and (5) time effect treatment. The elastic copper alloy and the method have advantages of reasonable alloy constituents, high alloying degree, simple production process, convenient operation, low production cost, high alloy strength, high conductivity and good stress relaxation resistance, and can realize the preparation of large specification billet, and Ni and Si content in the prepared target alloy system is high, and the process method of the invention is suitable for the industrialized production, and can replace the current aerospace high-power hermetically sealed electromagnetic relays, as well as raw materials and production processes of high performance conductive elastic devices in the electronic industry.

The invention discloses a high-strength and high-conductivity CuCrZrMg series copper alloy wire. The high-strength and high-conductivity CuCrZrMg series copper alloy wire comprises the following components in percentage by mass: 1.5-15.0% of Cr, 0.1-2.5% of Zr, 0.05-1.0% of Mg and the balance being copper and inevitable impurities. In addition, the invention also discloses a preparation method ofthe high-strength and high-conductivity CuCrZrMg series copper alloy wire. The preparation method comprises the following steps: step one. carrying out fusion casting to obtain an ingot casting; steptwo. carrying out surface treatment and homogenization treatment on the ingot casting; step three. carrying out cold forging to obtain a bar, and then carrying out cold rotary forging to obtain a wire bar; and step four. drawing the wire bar to obtain the wire, and carrying out ageing treatment on the wire. The high-strength and high-conductivity CuCrZrMg series copper alloy wire has the beneficial effects that the wire is reasonable in design of the alloy components, high in alloying degree, appropriate in production cost, controllable in technology and environmentally-friendly and has highalloy strength and high electrical conductivity; and the high tensile strength and the high electrical conductivity can meet the requirements of high current connectors, electric power, machinery andelectronics and the like on high-strength and high-conductivity materials.

The invention relates to a porous chromium alloy material and a preparation method thereof, wherein the porous chromium alloy material is in a three-dimensional netted structure, a base material is porous metallic iron, nickel or an iron-nickel alloy, metallic chromium is plated on the surface of the base material, and the mass of the chromium accounts for 5-30 percent of the gross mass of a metal material. The preparation method thereof comprises the following steps of: plating the chromium on the surface of the porous metallic iron, the nickel or the iron-nickel alloy; and then, carrying out heat processing on the iron, the nickel or the iron-nickel alloy after chromium plating in a heat processing furnace. The porous chromium alloy material has high temperature resistance, higher strength, simple preparation process and low cost and is suitable for large-scale production.