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White Tungstic Acid 712

White tungstic acid is one of different types of tungstic acid, showing the appearance of white crystalline powder. It is less active than microcrystalline structure white tungstic acid. However, it is active, optical sensitive and can be easy reduced. Its chemical formula is mWO3•nH2O. There is powder and colloform, and the latter is difficult to be prepared. Producing Methods 1. Can be produced by adding dilute nitric acid into sodium tungstate solution. 2. Decompose peroxide tungstate solution by nitric acid.…

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Tungstic Acid 617

Tungstic acid is a kind of yellow powder with the relative density of 5.5. It refers to hydrated forms of tungsten trioxide (WO3). The simplest form, the monohydrate, is WO3•H2O, the dihydrate WO3•2H2O is also known. Its boiling point is 1473°C. It is slightly soluble in hot water, slowly soluble in caustic alkali, and soluble in hydrofluoric acid (HF) and ammonia. While it is almost insoluble in acid, except HF. Tungstic acid can exist in a variety of states, including…

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Calcium Tungstate 351

Calcium tungstate is a white crystalline with tetragonal system. It decomposes in hot hydrochloric acid. Also, it is slightly soluble in water and ammonium chloride solution. Its relative density is 6.062g/cm3, chemical formula is CaWO4, where W has a valence of +6. Producing Processes 1. Processed from natural scheelite. 2. Adopt tungsten trioxide and calcium carbonate as raw materials, and burn at the temperature of 1070°C. 3. Made by the reaction of calcium oxide/calcium hydroxide and tungsten oxide/tungsten hydroxide in…

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Sodium Tungstate 403

Sodium tungstate is a kind of white shiny crystalline or crystalline powder, whose chemical formula is Na2WO4. It is weathered in the air. Also, it is insoluble in ethanol, slightly soluble in ammonia, and soluble in water, which is slight alkalinity. It is also known for its anti-diabetic effects. Sodium tungstate is prepared from tungsten ores used to manufacture tungsten by reducing it. It is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones…

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Metatungstic Acid 602

Metatungstic acid is a highly soluble and colorless crystal with a density of 3.93g/cm3. It is a kind of polytungstic acid with the formula H6 [H2 (W3O10) 4] • nH2O, in which n is 10 or 23. It decomposes at 50°C. Its solubility is 88.57g/100cm3 (in water, at the temperature of 25°C). Metatungstic acid can be made from the salt of metatungstic acid (metatungstate). Metoplutamate is an important industrial product developed in the late 1970s. It is mainly used as…

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Ammonium Tungstate 335

Ammonium tungstate is a kind of white rhombic crystal, which is soluble in water and insoluble in ethanol. Its chemical formula is (NH4)10W12O41~xH2O. And It loses four molecular of crystal water at the temperature of 100℃. At the temperature of 20°C, its solubility in water is less than 2%. Ammonium tungstate is one of tungsten compounds and is an important intermediate material for tungsten metallurgy industry. It is an important raw material for producing ammonium paratungstate, ammonium metatungstate and phosphorus…

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Tungsten Slurry 365

Tungsten slurry is composed of tungsten powder, inorganic binder phase and organic carrier, which has extremely high melting point, good conductivity and thermal conductivity. It is widely used in high temperature co-firing technology. Tungsten powder provides the premise for good sealing. The role of inorganic binder phase is to help sinter and provide sealing strength. The organic carrier is divided into three parts: resin, solvent and additive. Surfactant, leveling agent, antifoaming agents and other organic additives. Applications Melting point of…

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Waste Tungsten Powder 354

Waste tungsten powder is a tungsten powder that cannot meet the requirements of the follow-up production dingally and may be recycled during production, logistics transportation, storage and use. Recycling waste tungsten powder can improve economic efficiency and reduce environmental pollution. In the process of powder metallurgy, a lot of waste tungsten powder is produced for various reasons. In the process of logistics transportation, storage and use, oxidation may occur, or other substances, it may be adulterated to cause insufficient purity,…

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Ready to Press Tungsten Powder 358

Ready to press tungsten powder is a kind of powder used for cemented carbide sintering. It has excellent physical and chemical properties, good fluidity and compressibility, high chemical content and good carbon control. Characteristics Ready to press tungsten powder has stable apparent density, good liquidity and compressibility. Its chemical content is high, and amount of carbon control is good. Applications Ready to press tungsten powder is a raw material sintered in cemented carbide. During sintering, a series of physicochemical processes…

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Nano Scandium Oxide Doped Tungsten Powder 377

The scandium oxide of nano scandium oxide doped tungsten powder is evenly distributed and has small particles. It can produce excellent performance of the scandium tungsten matrix, improve the anti-ion bombardment performance, and help to improve cathode emission uniformity. Preparation Nano scandium oxide doped tungsten powder can be liquid-solid doping method by the decomposition of the reduction process. Scandium oxide evenly covered the surface of tungsten particles, pinning the role of inhibiting grain growth. Applications Nano scandium oxide doped tungsten…

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