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

The invention belongs to the field of titanium-based alloys, and particularly relates to a novel heat-resisting titanium alloy and a processing and manufacturing method and application thereof. The processing and manufacturing method comprises the composition elements of alloy components, smelting, heat processing, heat treatment and the like, wherein the alloy components are as follows (in percentage by weight): 5.4%-6.3% of Al, 3.0%-5.0% of Sn, 2.5%-6.4% of Zr, 0.0%-0.96% of Mo, 0.25%-0.5% of Si, 0.2%-0.5% of Nb, 0.3%-3.4% of Ta, 0.2%-1.6% of W, 0.0%-0.07% of C, less than or equal to 0.17% of O, less than or equal to 0.03% of Fe and the balance of Ti and inevitable impurity elements. The novel heat-resisting titanium alloy disclosed by the invention can obtain different matching of tensile strength, plasticity, permanence, creep strength and heat stability through the combination of different heat processing process and heat treatment processes, can be used for manufacturing parts, namely blades, coil assemblies and the like which are positioned on the high-temperature parts of an advanced aircraft engine, is used for a long time within a range of 600-650 DEG C, can also be used for manufacturing high temperature-resistant structural members, namely aerospace craft skin and the like, is used for a short time at about 700 DEG C and can be used as a material and the like used for high temperature-resistant corrosion-resistant valves of an automobile and a boiler.

The invention belongs to the technical field of copper alloy material, and discloses Cu-Ni-Si-based alloy with high strength and high conductivity, and a preparation method thereof. The Cu-Ni-Si-based alloy is characterized in that the Cu-Ni-Si-V alloy comprises the following components in weight percent: 95.5-97.5% of Cu, 2.0-3.0% of Ni, 0.5-1.2% of Si, and 0-0.3% of V; and the method comprises specific steps as follows: smelting pure copper, pure silicon, pure nickel and pure vanadium in an induction furnace according to the proportion, casting in a metal die to obtain a blank, and performing ageing and solution treatment for the blank after hot rolling and cold rolling deformation treatment. As shown by experimental results, the added alloy V has the remarkable grain refinement function on the CU-Ni-Si alloy; and appropriately-added V (0.086 weight percent) can significantly improve the conductivity of the alloy, at the same time, the combination properties of the alloy are improved to the conductivity of 60% IACS and the hardness number of 205 Hv from the conductivity of 41.4% IACS and the hardness number of 195.7 Hv only with slight reduction in hardness; and the alloy with 0.086 weight percent V can separate out second phase with a volume fraction twice of that of the alloy before adding V.

The invention relates to superfine iron-copper alloy powder and a preparation method thereof. The superfine iron-copper alloy powder is prepared by using ferric oxalate powder at an industrial raw material stage and cupric oxide powder at an industrial raw material stage as raw materials through high-energy ball milling and hydrogen reduction and has a fisher particle size smaller than 1.0 microns and a oxygen content smaller than or equal to 0.5 percent by weight. The invention has the advantages that grains of the superfine iron-copper alloy powder are thinner, the physical and chemical properties are superior, and the manufacture cost is low.

Complex reduction preparation method for high alloying Pt-based composition nano metal catalyst comprises: inject in precursor: add solution of Pt compound and other metal compound in carbon-carrier; mix and obtain constituent A; the other metals mean Ru, Os, Pd, Rh, Ir or Cr; take liquid-phase reduction at low temperature: add excessive reducer solution and mix, the reduced metal salt particles absorb on carbon carrier, and obtain constituent B; post process: bake and de-solvent to the constituent B, take bath in water and alcohol; dry at 40-150Deg, and obtain carbon carried PtM/C catalyst (M= Ru, Os, Pd, Rh, Ir or Cr). This invention changes electrode potential and reduces Pt and other metal at the same time to achieve the ordered sedimentation of multiple metals and improve alloying degree.

The invention belongs to the field of coatings and particularly relates to a Cr-free dacromet coating prepared through mechanical alloying and a preparation method thereof.The Cr-free dacromet coating is prepared from, by mass, 50-55% of metal alloy slurry, 40-45% of a Cr-free passivation solution and 3-6% of a related auxiliary agent.The metal alloy slurry is prepared from metal alloyed powder and a wetting agent through a ball milling technology.The metal alloyed powder is prepared from sheet zinc powder and sheet aluminum powder through ball milling mechanical alloying.The mass ratio of the zinc powder to the aluminum powder is (5:1)-(9:1).The total mass of the zinc powder and the aluminum powder is the same as the mass of the wetting agent.The obtained Cr-free dacromet coating is more stable in performance and low in porosity, few microscopic cracks and holes of the coating exist, the compactness of the coating is high, the corrosion resistance of the coating is good, and the environmental requirement is met on the premise that the performance requirement is met.

The invention discloses iron-copper alloy powder and a preparation method thereof. The iron-copper alloy powder is prepared from the following raw materials in percentage by mass: 10-30 percent of copper oxide powder and 70-90 percent of iron-copper pre-alloyed powder. The preparation method comprises the following steps: selecting the copper oxide powder prepared through roasting and crushing, uniformly mixing the copper oxide powder and the iron-copper pre-alloyed powder according to a ratio, carrying out active diffusion sintering on the mixture in a reducing atmosphere, crushing and sieving the mixture subjected to sintering, and finally preparing the iron-copper alloy powder. The iron-copper alloy powder is lower in apparent density and good in formability, has the apparent density being 2.5-3.0g/cm<3> and the green strength being 12-15MPa, makes up for the deficiencies in the prior art and broadens the application market.

The invention provides a carbon-loaded core-shell catalyst with nano copper nickel alloy core-precious metal shell and a preparation method of the catalyst, belonging to the field of fuel cells and energy-saving electrolysis. A conductive carbon material serves as a carrier, a base metal CuNi alloy with corrosion resistance and high alloying degree serves as a core, a precious metal (namely an alloy of one or two in M, Pt, Pd, Ru, Ir and Rh) serves as a shell layer, so that the carbon-loaded core-shell metal catalyst is prepared. The method comprises the following preparation steps: performing heat treatment on carbon dipped with copper and nickel salt at the temperature of 300-1000 DEG C under a reducing atmosphere, thereby obtaining CuNi/C; performing reflux reduction on CuNi/C in ethylene glycol containing the precious metal salt and PVP, thereby obtaining the CuNi@M/C core-shell catalyst. The alloying degree and corrosion resistance of the core CuNi are improved, the CuNi alloy surface is beneficial to precious metal selective deposition, and the precious metals in finite quantity are deposited on the CuNi core in a small layer number. According to the catalyst prepared by the method, the loading capacity of precious metals is reduced from 20 percent of the traditional catalyst to 5-10 percent, the electrocatalytic activity is not lowered, and the stability is high.

The invention relates to a nickel base powder high-temperature alloy with high tensile strength and a preparation method thereof, belongs to the technical field of high-temperature alloys, and solvesthe technical problems of strict requirements on high-temperature alloy materials by such hot end parts as turbine discs in traditional engines and incapability of meeting the performance requirementsby traditional high-temperature alloy materials. The powder high-temperature alloy comprises the following chemical components in percentage by mass: 0.04-0.08 of C, 17.0-19.0 of Co, 11.0-13.0 of Cr,6.0-6.7 of W, 4.3-5.0 of Mo, 4.9-5.4 of Al, 1.5-1.9 of Ti, 2.5-2.9 of Nb, 0.2-0.5 of Hf, B less than 0.03, Zr less than 0.03, Mg less than 0.005, Ce less than 0.002, and the balance of Ni and other inevitable impurities. The powder high-temperature alloy achieves high tensile strength and excellent high-temperature creep resistance and high-temperature endurance, and is mainly used for preparingsuch hot end parts as aeroengine turbine discs.

The invention discloses a metal surface acute deformation alloying method. The metal surface acute deformation alloying method is characterized by comprising the following steps: (1) the surface of a metal sample is pretreated; (2) alloying metal powder is uniformly applied on the surface of the metal sample; (3) an impact device is adopted to continuously impact the surface of the metal sample; (4) the alloying metal powder is uniformly applied on the impacted surface of the metal sample; and (5) the metal sample is put in a vacuum annealing furnace for return treatment. The metal surface acute deformation alloying method is simple in process, is controllable in impact force in the punching process, can form higher residual compressive stress on the surface, facilitates prevention of cracks, and prolongs the service life.

The invention discloses a quantum dot synthesis method. The synthesis method comprises the steps that a CdZnSe quantum dot serving as a nucleus is provided; a mixed reaction system containing the CdZnSe quantum dot, a cadmium source, a zinc source and a sulfur source reacts, and a CdZnS transition layer is formed on the CdZnSe quantum dot, wherein the zinc source comprises a precursor obtained byshort chain zinc fatty acid and amine which react under activation of a phosphine source. Accordingly, by means of the zinc source high in activity, the phenomenon that CdS is generated simply, so that the quantum dot efficiency is low can be avoided, the activity difference among Cd, Zn and S can be reduced, the quantum dot internal defects brought by the lattice parameter difference are reduced,and the quantum dot efficiency is improved. The obtained quantum dots are high in absorbance, high in luminous efficiency, uniform in size, good in monodispersion and narrow in half peak width.

The invention discloses an Al-Zn composite material which comprises an Al base body and Al-Zn alloy blocks distributed on the Al base body. The Al-Zn alloy blocks are distributed in the Al base body in an array. The embodiment of the invention further discloses an Al-Zn composite material solid-state alloying manufacturing method. Firstly, an aluminum sheet is selected, and rows of small holes are formed in the aluminum sheet, then the small holes are filled with zinc powder and compacted, and finally the small holes filled with the zinc powder and the peripheral area of the small holes are mechanically mixed and rubbed. The Al-Zn alloy blocks in the Al-Zn composite material is high in alloying degree, the Al-Zn alloy blocks and the Al base body are tightly combined, and the using requirement of special environments can be met. The mixing and rubbing method is used for processing the Al-Zn composite material, and the alloy blocks can be directly manufactured under the solid phase condition. The technology is simple, the requirement for equipment is low, and the obtained alloy organizational structure is compact and fine in crystalline grain.

The invention discloses a die-casting aluminum alloy for a 5G communication base station shell. The die-casting aluminum alloy is characterized in that the alloy is prepared from the following components in percentage by weight: 5-8% of Si, 0.05-0.09% of Tc, 0.01-0.04% of Cd, 0.07-0.1% of Nb, 0.01-0.03% of Ag, 0.02-0.05% of Ca, 0.06-0.08% of Sr, 0.5-1.2% of Cr, 2-4% of Zn, 0.01-0.03% of Ir, 0.001-0.003% of B, 0.04-0.07% of rare earth element, 0.003-0.005% of surface metallized graphene, and the balance of Al and inevitable impurities. The content of the inevitable impurities does not exceed 0.01%. The invention further provides the preparation method of the die-casting aluminum alloy for the 5G communication base station shell. The die-casting aluminum alloy for the 5G communication base station shell is better in mechanical property and corrosion resistance, better in heat conductivity and die-casting process stability, longer in service life and lighter in weight, and is the first choice of 5G communication base station shell materials.

The invention discloses a manufacturing method for a scale breaking tension leveler working roll. By adopting Cr12MoVCo die steel as the material, the manufacturing method includes the steps of: rough turning, hardening and tempering, semi-finish turning, shaping treatment, coarse grinding of roll surface, preheating, medium frequency spray quenching, isothermal treatment, tempering, and finish machining, thus obtaining a finished product. Specifically, the preheating temperature is 400-450DEG C, the medium frequency spray quenching temperature is 1100-1200DEG C, the isothermal temperature is 200-250DEG C, and the tempering temperature is 500-550DEG C. In the invention, by changing the thermal treatment process, under the circumstance of obtaining quenched martensite on the surface, a transition layer is mainly based on bainite, high hardness and high wear resistance of the surface are retained, toughness of the transition layer and the core is increased, the occurrence of microcracking is reduced, and the fracture risk in use is avoided. The thickness of the transition layer is increased, the overall strength of the roll is increased, the stress distribution is more reasonable, and the grinding performance of the roll is improved.