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Tungsten Pentaboride 205

Tungsten pentaboride, also called tungsten boride (W2B5), is a black powder with chemical formula of B5W2, molecular weight of 428.79100, exact weight of 430.00300, CAS No. of 12007-98-6, melting point of 210~214°C and boiling point of 110°C (1 Torr). It is somewhat toxic. Preparation Method In a vacuum or argon atmosphere, sintered at the temperature range of 1200~1300°C with 2mol tungsten powder and 5mol boron powder. Applications 1. For fine chemicals. 2. As a pharmaceutical intermediate or materials intermediate. Toxicity…

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Tungsten Boride 226

Tungsten boride is a silver octahedron crystal with high hardness that dissolves in aqua regia and some concentrated acid. But, it is insoluble in water. Its molecular formula is WB2. WB2 may be obtained by heating metal tungsten and boron with electric furnace. The CAS number of tungsten boride is 234-498-8. The melting point is 2900°C. The density is 10.77g/cm3. And it is decomposed by chlorine under 100°C. The Vickers hardness of WB2 crystals is ~20 GPa. Structure of Tungsten…

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Tungsten Telluride 233

Tungsten telluride is a semi-metallic material, which is a gray solid under normal temperature and pressure. It is non-magnetic. Its CAS number is 12067-76-4; Molecular formula is WTe2; Molecular weight is 441.05600; Accurate mass is 445.77900; Density is 9.43g/cm3; Melting point is 1020°C. Recently, WTe2 is predicted to be a Weyl semimetal and, in particular, to be the first example of a “Type II” Weyl semimetal, where the Weyl nodes exist at the intersection of the electron and hole pockets.…

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Tungsten Silicide 189

Tungsten silicide is an odorless blue gray tetragonal crystal with CAS number of 12039-88-2, density of 9.88g/cm3, melting point of 900°C, molecular formula of WSi2, and molecular weight of 240.01100. It is insoluble in water and aqua regia. And it dissolved in nitric acid and hydrofluoric acid mixture. Also, it can react violently with substances such as strong acids, fluorine, oxidizers, and interhalogens. Applications 1. Tungsten silicide is an electrically conductive ceramic material. 2. It is used in microelectronics as…

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Tungsten Selenide 245

Tungsten selenide is an inorganic compound that can absorb light like graphene. Its CAS No. is 12067-46-8; Molecular formula is WSe2; Molecular weight is 341.77. The light that WSe2 absorbs is used to generate electricity. WSe2 is a very stable semiconductor in the group-VI transition metal dichalcogenides. Structure The compound adopts a hexagonal crystalline structure similar to molybdenum disulfide. Every tungsten atom is covalently bonded to six selenium ligands in a trigonal prismatic coordination sphere while each selenium atom is…

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Fine Spherical Tungsten Powder 423

The fine spherical tungsten powder is prepared by a plasma method and has the characteristics of good fluidity, good quality, high purity, uniform particle size distribution. It is widely used in thermal spraying, porous materials, and powder metallurgy industries. Applications Porous tungsten prepared by fine spherical tungsten powder has more uniform voids, and is gradually replacing conventional tungsten powder for making porous tungsten parts such as cathodes for high-power pulsed microwave tubes, tungsten-tungsten cathodes for electron tubes, and molten Zn.…

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Fine Crystalline Tungsten Carbide Powder 388

Fine crystalline tungsten carbide powder has stable chemical properties, and hardness is similar to that of diamond, which is a good conductor of electricity and heat. It is wear-resistant, corrosion-resistant, and high-temperature resistant. It is the main raw material for producing fine-grained carbide. Applications Fine-grain tungsten carbide powder is the main raw material for producing fine-grained hard alloys. Ultrafine grained tungsten carbide is tungsten carbide with a grain size of tungsten carbide less than 1μm. It has higher hardness, strength,…

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Spherical Metal Tungsten Powder 413

Spherical metal tungsten powder has good fluidity, and is mainly used as a diamond drill bit for petroleum drilling and a raw material for petroleum perforating bullets. It can be prepared by a plasma spheroidization method. Characteristic The appearance of spherical metal tungsten powder is steel gray powder, which is polyhedron, powder is nearly spherical, has good fluidity, high purity and low oxygen content. Applications Tungsten metal tungsten powder is mainly used as diamond drill bit for oil drilling (as…

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Micron Tungsten Carbide Cobalt Composite Powder 399

Micron tungsten carbide cobalt composite powder has uniform element distribution, fine powder particle size, narrow particle size distribution, etc. The average particle size of the powder is 50~150nm. It is widely used in the manufacture of superfine/nanocrystalline tungsten carbide tools and surface strengthening materials. Properties The physical properties of micron tungsten carbide cobalt composite powder are very different from those of conventional powders. The non-metallic tungsten carbide phase and metal cobalt phase constitute a composite structure, not a simple mixture;…

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Nano Tungsten Carbide Cobalt Composite Powder 386

The commonly used ratio of nano tungsten carbide cobalt composite powder is 90/10, 94/6, purity is more than 99%, average particle size is 50nm, free carbon is less than 0.09%, oxygen content is less than 0.25%, remaining impurities content is less than 0.4%. It has excellent wear resistance and can be used as an abrasion resistant coating material and as a raw material for various cutting tools. The nano tungsten carbide cobalt composite powder has excellent effects as an abrasion-resistant…

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