Abstract: Powder metallurgy, in particular production of tungsten monocarbide spherical powders, which is a major component of metalloceramic hard alloys used for manufacture of tools, drill bits, steel alloying, wear-resistant coating cladding at elements operating in intensive wear conditions. The method includes melting of the starting material, and melt atomization with forming of spherical powder. As starting material a tungsten monocarbide grit is used. Melting and atomization of the material is implemented by continuous filling of grit into a rotating crucible of a centrifugal atomization device under an inert atmosphere and melting it by a plasma arc. After that an annealing of the obtained powder is made at a temperature of 1200-1400° C. during a time necessary for W2C breakup with subsequent cooling of the powder in a furnace. And, the production of tungsten monocarbide spherical powder with WC content of more than 70%.

Abstract: Powder metallurgy, in particular production of tungsten monocarbide spherical powders, which is a major component of metalloceramic hard alloys used for manufacture of tools, drill bits, steel alloying, wear-resistant coating cladding at elements operating in intensive wear conditions. The method includes melting of the starting material, and melt atomization with forming of spherical powder. As starting material a tungsten monocarbide grit is used. Melting and atomization of the material is implemented by continuous filling of grit into a rotating crucible of a centrifugal atomization device under an inert atmosphere and melting it by a plasma arc. After that an annealing of the obtained powder is made at a temperature of 1200-1400° C. during a time necessary for W2C breakup with subsequent cooling of the powder in a furnace. And, the production of tungsten monocarbide spherical powder with WC content of more than 70%.

Abstract: A spherical tungsten carbide powder is characterized by that the material has a microhardness higher than 3600 kgf/mm2, and that the powder has an apparent density from 9.80 to 11.56 g/cm3. A method for the manufacture of a powder comprises the steps: a) providing a chamber comprising a rotatable crucible, b) adding material into said rotatable crucible, c) melting the material using a plasma arc discharge, d) rotating the crucible to atomize the molten material to form liquid droplets, with subsequent cooling of the droplets to obtain a powder, wherein the material added into said rotatable crucible is heated to a temperature above 40% of the melting temperature of the material before it enters the crucible. It is possible to reduce the current required for melting the stock. Heat losses are decreased, and the spherical powder obtained during atomization becomes more homogeneous in its composition and structure. The cost is reduced.

Abstract: A spherical tungsten carbide powder is characterized by that the material has a microhardness higher than 3600 kgf/mm2, and that the powder has an apparent density from 9.80 to 11.56 g/cm3. A method for the manufacture of a powder comprises the steps: a) providing a chamber comprising a rotatable crucible, b) adding material into said rotatable crucible, c) melting the material using a plasma arc discharge, d) rotating the crucible to atomize the molten material to form liquid droplets, with subsequent cooling of the droplets to obtain a powder, wherein the material added into said rotatable crucible is heated to a temperature above 40% of the melting temperature of the material before it enters the crucible. It is possible to reduce the current required for melting the stock. Heat losses are decreased, and the spherical powder obtained during atomization becomes more homogeneous in its composition and structure. The cost is reduced.

Abstract: This invention relates generally to the area of metallurgy and/or chemistry and, more particularly, to the technologies and facilities for production of gaseous silicon tetrafluoride and polycrystalline silicon from gaseous silicon tetrafluoride. The method for production of silicon tetrafluoride from fluorosilicic acid solution includes: generation of acid extract, extract washing, extract drying, extract decompounding, bubbling of unseparated gaseous silicon tetrafluoride and hydrogen fluoride flow through silicon dioxide. The method of silicon production includes interreaction between gaseous silicon tetrafluoride and magnesium vapour with subsequent separation of the final product. Technical results is as follows: production of silicon with high purity level, increased output of the final product, improvement of environmental friendliness of production process, simplification of the technological process of silicon production, decreased prime cost of the final product.