The present invention relates to a method for the production of palladium(0) powder in which a palladium(0) starting powder is subjected to a thermal treatment in a furnace at a temperature of no more than 370° C. in a hydrogen gas atmosphere.

The present invention relates to a method for the production of palladium(0) powder in which a palladium(0) starting powder is subjected to a thermal treatment in a furnace at a temperature of no more than 370° C. in a hydrogen gas atmosphere.

The invention relates to a cold work tool steel. The steel comprises the following main components (in wt. %): C 0.5-2, N 1.3-3, Si 0.05-1.2, Mn 0.05-1, Cr 2.5-5.5, Mo 0.8-2.2, V 6-18, with a balance of optional elements, iron, and impurities.

The invention relates to a cold work tool steel. The steel comprises the following main components (in wt. %): C 0.5-2, N 1.3-3, Si 0.05-1.2, Mn 0.05-1, Cr 2.5-5.5, Mo 0.8-2.2, V 6-18, with a balance of optional elements, iron, and impurities.

The present invention relates to a composite tantalum powder and a process for preparing the same, and to a capacitor anode prepared from the tantalum powder. The method for preparing a composite tantalum powder comprises the following steps of: 1) providing a tantalum powder prepared by a reduction process, and flattening the tantalum powder so as to prepare a flaked tantalum powder; 2) providing a granular tantalum powder prepared from tantalum ingot; 3) mixing the flaked tantalum powder and the granular tantalum powder to give a tantalum powder mixture; and 4) thermally treating the tantalum powder mixture, and then pulverizing, screening to give a composite tantalum powder. The present invention further relates to a composite tantalum powder prepared from the process and the use thereof in a capacitor.

An FeNi ordered alloy has an L1.sub.0 ordered structure, a mean order degree of 0.4 or more throughout a material, and a coercivity of 87.5 kA/m or more. For example, a nitriding treatment of an FeNi random alloy is performed and then a nitriding treatment is performed to obtain an L1.sub.0-FeNi ordered alloy. A volume mean particle size of a FeNi random alloy is, for example, 45 nm or more, and a treatment temperature of the nitriding treatment is, for example, greater than or equal to 300 degrees Celsius and is less than or equal to 500 degrees Celsius, and a treatment period is, for example, 10 hours or longer.

An FeNi ordered alloy has an L1.sub.0 ordered structure, a mean order degree of 0.4 or more throughout a material, and a coercivity of 87.5 kA/m or more. For example, a nitriding treatment of an FeNi random alloy is performed and then a nitriding treatment is performed to obtain an L1.sub.0-FeNi ordered alloy. A volume mean particle size of a FeNi random alloy is, for example, 45 nm or more, and a treatment temperature of the nitriding treatment is, for example, greater than or equal to 300 degrees Celsius and is less than or equal to 500 degrees Celsius, and a treatment period is, for example, 10 hours or longer.

This invention relates to a preparation method of rare earth oxide dispersion strengthened fee grain tungsten materials, the mass percent of the rare earth oxide is of 0.1-2%, and the rest ingredient is W. Weigh soluble rare earth salt and tungstate, dissolve into water to made into 50-100 g/L of rare earth salt solution and 150-300 g/L of tungstate solution, respectively. Firstly, add trace alkali in rare earth salt solution to control pH in 7-8, then add organic dispersant and stir to form evenly suspended R(OH).sub.3 particle colloid (R refers to rare earth element). Secondly pour the tungstate solution into the R(OH).sub.3colloid, add trace acid to control pH in 6-7, then add organic dispersant and stir to form tungstic acid micro particles, which wrap around the colloidal particles, forming coprecipitation coating particle colloid. Thirdly, the coprecipitation coating particle colloidal is spray-dried, forming tungsten and rare earth oxide compound precursor powder. Alter that, ultrafine or nanoscale tungsten powder with particle size of 50˜500 nm is obtained through a process of calcination subsequent with hydrogen thermal reduction. Finally, the tungsten powder is subjected to ordinary compression molding and then conventional high temperature sintering. The trace rare earth oxide dispersion strengthened high performance fine grain tungsten materials prepared by this invention, its density is close to full density (98.5% or higher), its grain size is uniform and very fine (average in 5˜10 microns), and the rare earth oxides particles evenly distribute in tungsten intracrystalline or grain, boundary with particle size of 100˜500 nm.

This invention relates to a preparation method of rare earth oxide dispersion strengthened fee grain tungsten materials, the mass percent of the rare earth oxide is of 0.1-2%, and the rest ingredient is W. Weigh soluble rare earth salt and tungstate, dissolve into water to made into 50-100 g/L of rare earth salt solution and 150-300 g/L of tungstate solution, respectively. Firstly, add trace alkali in rare earth salt solution to control pH in 7-8, then add organic dispersant and stir to form evenly suspended R(OH).sub.3 particle colloid (R refers to rare earth element). Secondly pour the tungstate solution into the R(OH).sub.3colloid, add trace acid to control pH in 6-7, then add organic dispersant and stir to form tungstic acid micro particles, which wrap around the colloidal particles, forming coprecipitation coating particle colloid. Thirdly, the coprecipitation coating particle colloidal is spray-dried, forming tungsten and rare earth oxide compound precursor powder. Alter that, ultrafine or nanoscale tungsten powder with particle size of 50˜500 nm is obtained through a process of calcination subsequent with hydrogen thermal reduction. Finally, the tungsten powder is subjected to ordinary compression molding and then conventional high temperature sintering. The trace rare earth oxide dispersion strengthened high performance fine grain tungsten materials prepared by this invention, its density is close to full density (98.5% or higher), its grain size is uniform and very fine (average in 5˜10 microns), and the rare earth oxides particles evenly distribute in tungsten intracrystalline or grain, boundary with particle size of 100˜500 nm.

Metal powder particles for use in additive manufacturing are made by removing material from the surface of the particles using wet chemical etching to create a nanoscale texturing of the surface, increasing absorptivity by the metal powder particles of incident laser light and maintaining flowability. The nanoscale texturing has sub-wavelength features at laser wavelengths in the range 800-1100 nm. The particles are substantially spherical and have mean diameters in the range 10-70 μm.