10 results about "Hafnium powder" patented technology

The invention provides a resource treatment method for waste residues in the process of preparing metal hafnium through calcium thermal reduction, which specifically comprises the following steps: (1) preparing metal hafnium through calcium thermal reduction, and generating calcium thermal products and waste heat in the process of preparing metal hafnium through calcium thermal reduction; (2) carrying out acid leaching on a calcium thermal product in the metal hafnium preparation process by adopting the recycled acid liquor; (3) performing solid-liquid separation through a centrifugal machine after acid leaching to obtain a hafnium powder and calcium salt mixed solution; (4) pre-concentrating the calcium salt mixed stock solution in a stock solution tank, and then feeding the pre-concentrated calcium salt mixed stock solution into an evaporative crystallization salt separation system for mixed salt separation; and (5) the hafnium powder and mixed acid generated in the hafnium oxide production process react in the acid leaching tank, and a hafnium product is obtained. Separation and purification of the divalent calcium salt are achieved, no waste liquid is generated, condensate water reaches the direct discharge standard, the purity of the obtained product reaches the national or industrial standard, the obtained calcium salt can be reasonably utilized, and comprehensive utilization of energy and resources is achieved.

The present invention provides a method for preparing hafnium metal by molten salt electrolysis of hafnium carbide, which includes: after uniformly mixing hafnium carbide raw materials and an appropriate amount of binder, granulating, and then subjecting to vacuum sintering treatment to obtain hafnium carbide particles; mixing alkali metal / alkaline earth metal chlorides with a small amount of hafnium salts, pre-melting and then cooling to obtain a molten salt electrolyte; adding the hafnium carbide particles to the bottom of a graphite crucible in an electrolytic furnace, and then adding the molten salt electrolyte into the graphite crucible, sealing the equipment and then carrying out electrolysis; after the electrolysis is completed, collecting the deposits attached to the cathode and extracting the hafnium metal from the deposits; the present invention uses hafnium carbide as the anode material, avoiding the problem of a large amount of chlorine gas being evolved at the anode during the direct electrolysis of hafnium powder in a high-temperature molten salt system, which causes equipment corrosion; in addition, the production cost of hafnium carbide is relatively low and can be obtained by carbon reduction method using hafnium oxide as the raw material, greatly saving costs compared with using hafnium sponge as the anode material.

The application relates to the technical field of rare metals, and discloses a method for preparing metal hafnium by reduction, which comprises the following steps: S1, mixing hafnium oxide, calcium and calcium chloride, and carrying out a thermal reduction reaction under a protective gas to obtain a solid mixture; S2, carrying out acid pickling, water washing and drying on the solid mixture to obtain metal hafnium powder; S3, melting the metal hafnium powder under the protective gas, and cold-pressing and forming the metal hafnium powder to obtain the metal hafnium; the calcium chloride is composed of first calcium chloride and second calcium chloride, and the first calcium chloride and the second calcium chloride are in different forms. Through the technical scheme, the problem of high oxygen content in the related art when metal hafnium is prepared by reduction is solved.

Disclosed are an ignition powder, a preparation method therefor and a use thereof, and an airbag gas generator, which belong to the technical field of ignition powders. The raw materials of the ignition powder include the following components in percentages by mass: potassium perchlorate. 30%˜50%; basic copper nitrate: 5%˜20%; a fuel: 15%˜60%; a metal oxide: 1%˜25%; and a metal powder: 1%˜25%, wherein the metal powder is at least one of a titanium powder, a magnesium powder, a copper powder, an iron powder, a zirconium powder, a hafnium powder, a tungsten powder or a silicon powder.

The invention belongs to the technical field of alloy materials, and particularly discloses a tungsten alloy material for a pantograph and a preparation method thereof.The tungsten alloy material comprises, by weight, 68-75 parts of spherical tungsten powder, 8-15 parts of flaky copper powder, 4-8 parts of high-entropy alloy powder, 2-6 parts of modified carbon nanotubes, 1-4 parts of spherical carbon powder, 1-3 parts of chromium powder, 0.5-2 parts of manganese powder and 0.2-0.6 part of zinc stearate; the high-entropy alloy powder comprises titanium aluminum carbide, molybdenum powder, tungsten diboride powder, cobalt powder, hafnium powder and zirconium powder, and the mass ratio of the titanium aluminum carbide to the cobalt powder to the hafnium powder to the molybdenum powder to the tungsten diboride powder to the zirconium powder is (25-35): (20-30): (10-20): (10-20): (8-15): (2-6). The tungsten alloy material provided by the invention has excellent impact toughness and wear resistance, is very suitable for preparing the pantograph, and has a wide application prospect.

The invention relates to the technical field of rare metals, and provides a method for preparing metal hafnium through reduction, which comprises the following steps: S1, mixing hafnium oxide, calcium and calcium chloride, and carrying out thermal reduction reaction under protective gas to obtain a solid mixture; s2, the solid mixture is subjected to acid pickling, water washing and drying, and metal hafnium powder is obtained; s3, the metal hafnium powder is fused under protective gas, and metal hafnium is obtained after cold press molding; the calcium chloride is composed of first calcium chloride and second calcium chloride, and the first calcium chloride and the second calcium chloride are different in form. According to the technical scheme, the problem that the oxygen content is high when metal hafnium is prepared through reduction in the prior art is solved.

The application discloses a kind of Hf-Ta-Mo-Si multivariate ultra-high temperature oxidation-resistant coating, by Hf-rich surface layer, TaSi2 intermediate layer and Ta5Si3 interface reaction bottom layer, and the interface between each layer is in-situ self-birth interface;The preparation method of the coating is: one, the surface pretreatment of tantalum alloy;Two, hafnium powder, molybdenum powder and silicon powder are uniformly mixed with dispersant ball milling to obtain composite suspension slurry;Three, the composite suspension slurry is prepositioned on the surface of the tantalum alloy after surface pretreatment and dried to high-temperature melting and sintering.The coating of the application has better high-temperature stability and excellent thermal shock resistance and thermal shock resistance, and provides effective protection for tantalum alloy materials under the condition of oxygen strong thermal shock at 1000-1900 DEG C;The preparation method of the application is easy to realize the thickness control of coating, can be coated on the surface of special-shaped hot end part and inner surface, and is suitable for the ultra-high temperature protection of advanced orbit control rocket engine and hypersonic vehicle tantalum alloy high-temperature parts.

The application provides an antioxidant low-abrasion heat-resistant steam turbine blade coating and a preparation method thereof, and relates to the technical field of material surface treatment, and comprises the following components in mass ratio: nickel-cobalt-chromium-aluminum-yttrium alloy 20-30 parts, zirconia-yttria-alumina composite ceramic 30-40 parts, hafnium powder and rhenium powder mixture 10-15 parts, chromium sesquioxide 5-10 parts, rare earth oxide 3-5 parts, cerium dioxide 2-4 parts, silicon dioxide 3-5 parts, titanium carbide 5-8 parts, and zirconium boride 2-4 parts; the nickel-cobalt-chromium-aluminum-yttrium alloy and the zirconia-yttria-alumina composite ceramic are used in the application, a stable oxide film can be formed at high temperature, the further diffusion of oxygen is effectively prevented, the rare earth oxide and the cerium dioxide can promote the repair and stability of the oxide film, the antioxidant capacity of the coating is improved, and the blade can maintain good performance in a high-temperature environment for a long time.

The invention provides an antioxidant low-wear heat-resistant turbine blade coating and a preparation method thereof, and relates to the technical field of material surface treatment. Comprising the following components in parts by mass: 20-30 parts of nickel-cobalt-chromium-aluminum-yttrium alloy, 30-40 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, 10-15 parts of hafnium powder and rhenium powder mixture, 5-10 parts of chromium sesquioxide, 3-5 parts of rare earth oxide, 2-4 parts of cerium dioxide, 3-5 parts of silicon dioxide, 5-8 parts of titanium carbide and 2-4 parts of zirconium boride. The nickel-cobalt-chromium-aluminum-yttrium alloy and the zirconium oxide-yttrium oxide-aluminum oxide composite ceramic are adopted, a stable oxidation film can be formed at a high temperature, further diffusion of oxygen is effectively prevented, rare earth oxide and cerium dioxide can promote repair and stability of the oxidation film, the oxidation resistance of the coating is improved, and the service life of the coating is prolonged. And the blade can keep good performance for a long time in a high-temperature environment.

The invention discloses a preparation method of a tungsten-rhenium-lanthanum-hafnium copper infiltrated material. The preparation method comprises the following steps that 1, tungsten powder, rhenium powder, lanthanum powder and hafnium powder are selected; 2, tungsten powder, rhenium powder, lanthanum powder and hafnium powder are subjected to high-energy ball milling treatment; 3, the tungsten-rhenium-lanthanum-hafnium pre-alloyed powder obtained in the step 2 is loaded into a forming mold, a cold isostatic press is adopted for pressing forming, and a tungsten-rhenium-lanthanum-hafnium green body is obtained; 4, the tungsten-rhenium-lanthanum-hafnium green body is placed in a vacuum atmosphere sintering furnace to be sintered; 5, the sintered blank obtained in the step 4 is subjected to copper infiltration treatment in an infiltration furnace, and a tungsten-rhenium-lanthanum-hafnium copper infiltration material blank is obtained; and 6, the tungsten-rhenium-lanthanum-hafnium copper infiltrated material blank obtained in the step 5 is machined and subjected to flaw detection, and then the tungsten-rhenium-lanthanum-hafnium copper infiltrated material is obtained. According to the method, the problem that an existing tungsten infiltrated copper material is low in ablation resistance is solved. The invention also discloses the tungsten-rhenium-lanthanum-hafnium material prepared by the method.