42results about How to "Less impurity elements" patented technology

The invention relates to an electroslag remelting method for difficult-processing high alloy stainless steel and an electroslag remelting slag system adopting the electroslag remelting method. The slag system comprises the components in parts by weight: 46-72 parts of CaF2, 15-28 parts of CaO, 24-10 parts of Al2O3 and 8-2 parts of MgO, wherein the content of impurities is less than 1.0%. The electroslag remelting slag system and the electroslag remelting method reduce the contents of harmful elements in steel, improve the purity, optimize the organization, particularly and remarkably improve the processing performance of the difficult-processing high alloy stainless steel and greatly improve the material yield.

The invention relates to a method for separating a multi-element alloy of lead, bismuth, gold, silver and copper, which adopts a vacuum distillation method to treat the multi-element alloy, wherein the distillation temperature is 1,050 to 1,100 DEG C, the distillation time is 60 to 80min and the vacuum degree in a furnace is 5 to 15 Pa. Materials can be separated into a volatile (an alloy of lead and bismuth) and a residue (an alloy of gold, silver and copper). In the separated product, noble metals are gathered in 6 to 7 times; the recovery rate of each noble metal is over 99 percent; the loss of the noble metals is low; and the recovery rates of the lead and the bismuth are 98 percent and 98.5 percent respectively.

The invention discloses a heat mould steel material in the alloy steel material manufacturing technological domain, which comprises the following parts: 3.5-4.0%Cr, 2.0-2.5% Mo, 1.0-1.5% V,1.0-1.5% W , 0.1-0.5% Mn, 0.1-0.25% Ni, 0.3-0.35% C, 0.1-0.5% Si, 0.005-0.01% S, 0.01-0.02% P and Fe. The preparing method comprises the following steps: (1) fusing; (2) refusing electric slag; (3) evening at high temperature; (4) forging; (5) annealing; (6) forging blank; (7) annealing to obtain the product with hardness between 48-54HRC and impaction flexibility more than 300J.

The invention relates to the technical field of preparation of ceramic powder, and discloses rare earth tantalum/niobate (RETa/NbO4) ceramic powder and a preparation method thereof. The chemical general formula of the rare earth tantalum/niobate (RETa/NbO4) ceramic powder is RETa/RENbO4, the crystal structure of the ceramic powder is the orthorhombic phase, the crystal lattice space group is C2221, the particle size is 10-70 microns, and the ceramic powder is spherical. In the preparation process, raw materials are subjected to ball milling, after a high temperature solid phase method is adopted for a reaction the processed raw materials, a solvent and an organic adhesive are mixed to obtain paste C, after centrifugal atomization, dry material particles are obtained, resintering is conducted, and the rare earth tantalum/niobate (RETa/NbO4) ceramic powder meeting the requirements of an APS technology for ceramic powder is obtained.

The invention discloses a method for preparing composite of grapheme with different oxidation degrees and manganese dioxide. The method comprises the processes of: respectively carrying out low-temperature, intermediate-temperature and high-temperature subsection reactions on original graphite, and concentrated sulfuric acid with a mass concentration of 98% and potassium permanganate so as to obtain graphite oxide; dispersing the graphite oxide in de-ionized water, and reducing the prepared graphite oxide with hydrazine hydrate so as to obtain the grapheme oxide with different oxidation degrees by controlling reduction time; and mixing the grapheme oxide with MnCl2*4H2O in an isopropyl alcohol solution, and adding a water solution of the potassium permanganate to prepare the composite of the grapheme with the different oxidation degrees and the manganese dioxide through oxidation reduction. The method provided by the invention has the advantages as follows: materials used in the method are rich in storage amount and low in cost, so that the method is good in commercialization; an dispersing agent, a stabilizer and the like do not need to be added, and a pure chemical technology is used, so that simple operation, no pollution and low energy consumption can be realized; and the prepared composite material of the grapheme and the manganese dioxide has high purity and good stability.

The invention relates to a high-nitrogen austenitic stainless steel smelting method. The high-nitrogen austenitic stainless steel smelting method comprises the following steps of (1) blast-furnace molten iron pretreatment, (2) refining in a top-bottom combined blowing TSR stainless steel refining furnace, (3) refining outside a ladle refining furnace and (4) continuous casting. Compared with the prior art, the high-nitrogen austenitic stainless steel smelting method has the characteristics that the smelting cost is low, and the plate blank surface and interior quality meets the steel type requirements of the high-nitrogen austenitic stainless steel.

The invention belongs to the field of battery materials, and discloses a preparation method and application of iron phosphate. The preparation method comprises the following steps: roasting iron phosphate waste, adding into an acid solution, dissolving, filtering, and taking the filtrate to obtain a solution A containing iron and phosphorus elements; stirring the solution A and alkali liquor, adjusting the pH value to be acidic, reacting, washing, filtering, and taking filter residues to obtain an amorphous iron phosphate yellow filter cake; aging, pulping and heating the iron phosphate yellow filter cake, adding phosphoric acid and alkali liquor, washing, filtering, taking filter residues to obtain a basic ammonium iron phosphate filter cake, and drying to obtain basic ammonium iron phosphate crystal powder; and roasting, dehydrating and cooling the basic ammonium ferric phosphate crystal powder to obtain the iron phosphate. According to the invention, recycled ferrophosphorus waste is used as a raw material, amorphous iron phosphate is precipitated by adopting alkali liquor, and ammonia water and phosphoric acid are used as an aging agent under a high-temperature stirring condition, so that the purpose of controllable crystallization of basic ammonium ferric phosphate is achieved.

The invention belongs to the technical field of metal material heat conduction, in particular to thermal conductive aluminum alloy, and a preparation method and application thereof. According to the invention, mixed rare earth and boron refined alloy grains are utilized to reduce the content of harmful trace elements in the alloy, so that the aluminum alloy has excellent thermal conductivity underthe premise of high strength and plasticity. Embodiment results show that the aluminum alloy provided by the invention has a thermal conductivity of 236 W/m*K or more and a tensile strength of 199 MPa or more, and can be used as a heat dissipating material for electronic devices.

A treatment method for purifying manganese nitride alloy with ultra-low impurity content. The steps are to desulfurize metal manganese, carbon, and phosphorus, so that the content of sulfur, carbon, and phosphorus in manganese is reduced to C<0.02, S<0.01, P<0.01; Crush the above manganese metal into particles smaller than Φ2 and place it in a stainless steel container; put it into an electric furnace, connect the stainless steel tubes on the stainless steel container to the pure nitrogen source and the water container respectively; fill with pure nitrogen, observe the flow of nitrogen, and give Power is supplied to the electric furnace, the temperature is raised to 450-1100°C, and the temperature is maintained for 20-200 hours; the electric furnace is powered off, and nitrogen gas is continued until the temperature of the stainless steel container cools down to room temperature. The invention has high nitrogen content and low impurity elements.

The invention provides microalloying chromium-nickel austenitic heat-resistant steel. The microalloying chromium-nickel austenitic heat-resistant steel comprises the following components in percentage by mass: 0.30-0.60% of carbon, 2.00-3.00% of silicon, not more than 1.00% of manganese, not more than 0.04% of phosphorus, not more than 0.3% of sulfur, 23.00-28.00% of chromium, 27.00-30.00% of nickel, 0.50-1.50% of niobium, not more than 0.6% of molybdenum, 0.20-0.50% of nitrogen, 0.20-0.50% of vanadium, 0.01-0.05% of boron, 0.005-0.100% of rare-earth elements, and the balance iron. The microalloying chromium-nickel austenitic heat-resistant steel provided by the invention is high in strength, good in heat resistance and low in cost, has high capacity for resisting the tendency of generating hot cracks in the solidifying process of a casting, can be widely applied in the casting of a turbine case and an exhaust pipe of an automobile, and meets requirements for high-performance engines.

The invention relates to a manufacturing process of a high-fin cupronickel alloy efficient pipe. The manufacturing process comprises the following steps of casting, hot extrusion, first annealing, rolling, cogging, heading and stretching, second annealing, empty drawing, fin rolling, cleaning, rinsing, purging and drying, stress relief heat treatment, straightening, sizing, inspection and detection, and packaging and warehousing. According to the manufacturing process, the plasticity of a BFe10-1-1 copper alloy pipe blank is improved, the probability of foreign matter pressing in the large-deformation stretching process is reduced, the cracking situation during fin rolling is greatly reduced, the manufacturing selectivity of the efficient pipe with different finished product performance requirements is improved, and the process is high in feasibility and high in yield.

The invention provides a treatment system and a treatment method for reducing the content of impurities in a soluble manganese salt solution. The impurities comprise calcium ions and magnesium ions, the treatment system comprises an extraction unit and an evaporative crystallization device or a precipitation unit, the extraction unit is used for removing the magnesium ions, and the extraction unitis provided with a soluble manganese salt solution inlet, an extraction agent inlet and a primary purified product outlet; the evaporative crystallization device is provided with a primary purified product inlet, and the primary purified product inlet is communicated with the primary purified product outlet through a primary purified product conveying pipeline; the precipitation unit is providedwith a primary purification product inlet and a precipitant inlet, and the primary purification product inlet is communicated with the primary purification product outlet through a primary purification product conveying pipeline. By adopting the treatment system, the impurity content in the soluble manganese salt solution can be greatly reduced. The treatment system and a treatment method for reducing the content of impurities in a soluble manganese salt solution have the advantages of being simple in structure, small in solid slag and hazardous waste discharge amount and the like, and therefore good environmental friendliness is achieved.

The invention discloses a high-Al electrical steel square billet for an automobile generator pole claw and a production method of the high-Al electrical steel square billet. The electrical steel square billet comprises chemical components including, by mass, 0-0.010% of C, 0-0.10% of Si, 0-0.10% of Mn, 0-0.010% of P, 0-0.010% of S, 0.30%-0.40% of Alt and the balance Fe and inevitable impurities. The production method comprises the steps of molten iron pretreatment, converter smelting, LF furnace treatment, RH furnace treatment, continuous casting and cogging. A small square billet product produced through the production method is stable and uniform in component and small in impurity element amount, and production requirements of users for the automobile generator pole claw for export are met; and through the product, the generating capacity can be improved by 5%-8%, meanwhile, the overall thickness of the pole claw can be decreased by 0.5 mm, the magnetic resistance is effectively reduced, a remarkable effect on dynamic balance and light weight is achieved, the quality requirements for stable generating capacity and low noise of the export generator pole claw can be met, and the using effect is great.

The invention discloses an aluminum oxide/nickel-titanium alloy/aluminum oxide composite material prepared through diffusion bonding and a method of the composite material. Nickel-titanium alloy sheets and aluminum oxide sheets are used as raw materials, and the nickel-titanium alloy sheets are placed between the two aluminum oxide sheets to prepare a sample with a sandwich structure; the obtainedsandwich structure sample is placed in a graphite mold and fastened; and the graphite mold is put into a vacuum carbon tube furnace to be subjected to annealing treatment, and the aluminum oxide/nickel-titanium alloy/aluminum oxide sandwich layered composite material is prepared. According to the invention, the ceramic toughness of Al2O3 is improved, and reliable connection between Al2O3 ceramicand metal is realized.

The invention provides a damage-resistant aluminum alloy and a preparation method thereof. The damage-resistant aluminum alloy comprises the following components by mass percent: 3.6-4.3%of Cu, 1.0-1.6% of Mg, 0.3-0.8% of Mn, 0.1-0.15% of Zr, 0.1-0.2% of Er, and the balance Al and trace impurity elements, wherein the total content of the trace impurity elements is less than 0.1%. Through adjusting the content of a main alloy element and adding new alloy elements, the aluminum alloy having high resistance to fatigue crack extension and excellent mechanical property is obtained, and the problem that the comprehensive performance of the conventional damage-resistant aluminum alloy is difficult to improve is solved. With the adoption of a water atomization and steam heating mode for homogenizing treatment, the homogenizing time is shortened, the size of a second-phase particle is reduced, and significant effect is exerted on the improvement of the material fracture toughness. The damage-resistant aluminum alloy is simple in technology and low in cost, and large-scale industrial production can be realized easily.

The invention discloses a method and device for separating 434 aluminum alloy composite plates, belongs to the field of nonferrous metallurgy, and mainly solves the problem of recycling of the 434 aluminum alloy composite plates. The preparation method comprises the following steps: firstly, melting a coating alloy of the 434 aluminum alloy at 574-643 DEG C in a high-temperature centrifugal machine; then centrifugally separating the molten alloy, discharging the molten alloy through a liquid phase outlet pipe, closing a centrifugal mechanism, and taking out the unfused alloy; and finally, the molten alloy and the incomplete alloy are smelted in a smelting furnace and poured into cast ingots. The device comprises a shell, a heat preservation layer, a PID furnace temperature self-adjusting system, a centrifugal mechanism, a liquid outlet mechanism, a melt deposition tank, a liquid phase outlet pipe, a furnace cover lifting mechanism, a feeding and discharging mechanism and a tool. According to the method, a temperature field and a centrifugal force field are used for achieving same-grade recovery after a coating layer and a core layer of the 434 aluminum alloy composite plate are effectively separated, and 3003 aluminum alloy and 4004 aluminum alloy with the same-grade quality are obtained through separation.