4 results about "Tungsten carbide" patented technology

The present invention relates to a method for preparing tungsten oxide and tungsten powder from scheelite. The method uses the scheelite as a raw material and comprises the following steps: (1) conducting leaching reaction; (2) conducting filtering and washing; (3) conducting hydrogen peroxide extraction-decomposition to extract tungsten; (4) conducting hydrogen peroxide multiple dissolution-decomposition to purify tungstic acid; (5) pure tungstic acid calcination to prepare tungsten trioxide; and (6) conducting peroxotungstic acid solution spraying pyrolysis to prepare tungsten oxide and tungsten powder. The method only consumes cheap and easily available sulfuric acid, greatly reduces the decomposition cost of the scheelite and uses sulfuric acid to decompose; decomposed residues are gypsum; the gypsum can be used as building materials; the method does not produce dangerous waste alkali cooking residues, greatly reduces production and operation costs of enterprises, uses hydrogen peroxide as an extractant of tungstic acid, does not produce ammonia nitrogen wastewater, eliminates the technology of producing the ammonia nitrogen wastewater for many years in tungsten smelting, greatly reduces environmental protection costs, directly produces various tungsten end products and tungsten powder, and improves added value of products of the tungsten smelting enterprises.

The invention discloses an alloy powder for plasma cladding. The alloy powder for plasma cladding is mainly composed of, by mass, 51%-65% of chromium, 0%-15% of vanadium, 8.1%-9% of carbon, 6.1%-8% ofboron, 0%-6% of cobalt, 0%-12% of tungsten carbide and the balance Fe and unavoidable impurities. The alloy powder for plasma cladding is especially suitable for plasma cladding of wear-resistant parts, and a cladding layer is high in hardness, good in wear resistance, small in cracking tendency and good in plasma cladding technology performance.

The invention provides a preparation method of an ultrasonic-dispersion tungsten carbide and silicon carbide-carbon fiber friction material. The preparation method is characterized in that after performing carburization treatment on a graphited carbon fiber blanket with the density being from 0.1 to 1.8g/cm<3>, performing ultrasonic-dispersion tungsten carbide filling treatment, then performing silicon carbide deposition treatment, then performing burying siliconizing treatment, and then performing nitrogen treatment under nitrogen atmosphere, so as to prepare the ultrasonic-dispersion tungsten carbide and silicon carbide-carbon fiber friction material. According to the preparation method provided by the invention, the preparation of the friction material is realized by adopting the graphited carbon fiber blanket through the steps of carburization, tungsten carbide filling, silicon carbide deposition, burying siliconizing, nitridation and the like, the prepared friction material is high in strength, high in toughness, and high in friction performance and is a friction material suitable for various weather conditions.

The invention discloses an anti-corrosive glass fiber reinforced plastic used for sewage treatment. The anti-corrosive glass fiber reinforced plastic used for sewage treatment comprises, by mass, 26 to 43 parts of steel fiber; 17 to 35 parts of unsaturated polyester resin; 15 to 26 parts of phenolic resin; 10 to 17 parts of epoxy resin; 12 to 21 parts of crosslinked polystyrene; 6 to 13 parts of tungsten carbide; 7 to 15 parts of silicon carbide; 3 to 9 parts of mullite fine powder; and 5 to 11 parts of zirconium oxide. A preparation method is simple, and production cost is low. The anti-corrosive glass fiber reinforced plastic is high in compressive strength, excellent in corrosion resistance, wear resistance, anti-aging performance and sealing property, the entire service life of the anti-corrosive glass fiber reinforced plastic is prolonged, and more economic benefits is brought to companies.