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Fine Tungsten Carbide Powder 353

Fine Tungsten carbide powder has high purity, uniform particle size and good dispersibility. It has the surface electronic properties of platinum, which can be used as a catalyst in some organic reactions. Preparation Use metal tungsten powder and carbon black as raw materials, mixture in a certain proportion, the mixture into graphite boat, placed on a carbon tube furnace or high sense of intermediate frequency electric furnace, carbonized under a certain temperature, then through ball mill, screening. Finally, fine tungsten…

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Tungsten Carbide Powder 340

The chemical formula of tungsten carbide powder is WC. It is a good electric conductor with stable chemical properties. It is suitable for machining at high temperature and is the main raw material for the production of cemented Carbide. Characteristic Tungsten carbide powder is a black hexagonal crystal, with metallic luster, similar hardness to diamond, good conductor for electricity and heat. Melting point is 2870 ℃, the boiling point is 6000 ℃, the relative density is 15.63 (18 ℃). The…

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High-purity Yellow Tungsten Oxide 349

High-purity yellow tungsten oxide, also known as high-purity tungsten trioxide, is a kind of yellow powder with high main content (WO3), low impurity content and excellent physicochemical properties compared with conventional yellow tungsten oxide. High-purity Yellow Tungsten Oxide Producing Process Yellow tungsten oxide prepared by the following process has the characteristics of fine granularity, high purity and good stability. 1. Adjust pH of sodium tungstate solution to 4~8 by using organic or inorganic acid. After hydrothermal reaction 12 hours, filtration,…

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High-purity Violet Tungsten Oxide 285

High-purity violet tungsten oxide, high-purity VTO for short, is a kind of violet powder with very high main content and very low impurity content. Its chemical formula is WO2.72 or W18O49. High-purity material refers to a new type of material with high chemical purity, low impurity content, and excellent physical and chemical properties compared with conventional materials. It is obtained by modern metallurgy technology under a super-clean environment. With the continuous improvement of material purity, it will further reveal the…

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VTO 300

VTO is the short for violet tungsten oxide, also known as γ-tungsten oxide. It is a kind of violet or blue-violet crushed crystalline powder that is soluble in ammonia water and alkali solution. And it is insoluble in alcohol, water and most of acid. Its chemical formula is WO2.72 or W18O49 with the molecular weight of 227.36. Producing Method Violet tungsten oxide is manufactured under a certain reduction condition from the raw materials of ammonium paratungstate (APT), tungstic acid or…

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YTO 348

YTO, the abbreviation of yellow tungsten oxide, also called tungsten trioxide (WO3), is a yellow or bright green powder with the formula WO3-x, loose specific weight of 2.3~2.8g/cm3. The property of yellow tungsten oxide is stable at room temperature. Grades According to national standards, tungsten trioxide is usually divided into three grades, namely super grade (WO3-0), grade 1(WO3-1) and grade 2 (WO3-2). In addition, each manufacturer will produce yellow tungsten oxide with different specification because of the difference of raw…

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BTO 289

BTO is the abbreviation of blue tungsten oxide, which refers to a type of dark blue powder containing tungsten (VI) and mixed valence of tungsten (V). In the industry, blue tungsten oxide refers to a mixture of WO2.72, WO2.90, W20O58 and (NH4) x•WO3. BTO, which is mainly composed of ammonium tungsten bronze (ATB) and WO2.90, is a good raw material for the production of tungsten materials and an excellent raw material for tungsten-based tungsten carbide and other tungsten products. Pyrogenic…

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Phosphotungstic Acid 322

Phosphotungstic acid is a kind of pale-white powder with acidity and oxidation-reduction quality. Its chemical formula is H3O40PW12, melting point is 89°C, and CAS No. is 12067-99-1. It is slight weathering, soluble in alcohol, ether and water, and dissolved in about 0.5 parts water. Phosphotungstic acid can be applied as multidingal new type catalyst of high catalytic property, and even can be used as a phase transfer catalyst. It is a type of green catalyst that is stable and is…

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Ferrous Tungstate 301

Ferrous tungstate is a kind of tungstate, which can be made by hydrothermal method. It is commonly applied in dingal materials. And it can also be used in the preparation of dyes, pigments, catalysts, preservatives, fireproofing agents and ceramic materials. Other common seen tungstates include calcium tungstate (CaWO4), zinc tungstate (5ZnO • 12WO3), cobalt tungstate (CoWO4), cadmium tungstate (CdWO4) and ammonium tungstate [(NH4) 6W7O24 • 6H2O]. The chemical formula of ferrous tungstate is FeWO4, the molecular weight is 303.6826g/mol, the…

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Yellow Tungstic Acid 623

Yellow tungstic acid is the most common seen tungstic acid that appears as a kind of light yellow powder or crystalline with a melting point of 1473°C. It can not easily dissolve in phosphorus acid when it is fresh produced. It is insoluble in water. And it will be colloidizing after dipping so that it is soluble in ammonia solution, alkali solution and high concentrate hydrochloric acid. Its content will be different along with the changes of producing conditions. When…

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