Tungsten Diboride

Tungsten diboride is a black powder, its physical properties are as follows: chemical formula: BW2, molecular weight 378.49, density 1.6 g/ml, melting point: 2670℃, having metallic conductivity, dissolved in aqua regia. Tungsten diboride should be stored in airtight, cool and dry environment. If compliance the rules will no decomposition. BW2 commonly used in the wear-resistant coating and semiconductor thin film.
Tungsten diboride synthesis methods are as follows:
1. Tungsten and boron as raw material, making two of them to full mix and grind , above 1400 ℃ heating reacted WB. And then continued reaction to obtain W2B, after cooled, pulverized to obtain the product.
2. Mixing tungsten and stoichiometric boron powder in molar ratio W:B = 2:1, sintering in a vacuum or an argon atmosphere at 1200 ~ 1300 ℃, can be obtained tungsten diboride.
3. Using solid-phase method to produce tungsten boride, where stoichiometric metal tungsten and boron as raw martial after mixed, milled, shaped, heated at above 1400 ℃ to obtain WB. To continue reaction to produce W2B, after cooled, pulverized to obtain the product.

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