TUNGSTEN METAL POWDER PRODUCTION - Reduction of Doped Tungsten Oxides- 3

TBO is doped with about 3000-3500µg/g K, 2000-2500µg/g Si, and 400-500µg/g Al in the form of potassium silicate and aluminum chloride or nitrate solutions.

In reduction of the doped oxide, part of the dopants is incorporated during the CVT growth of the metal particles in the form of silicates. Excess dopant, which remains on the tungsten crystal surfaces, is removed by subsequent leaching of the powder in HCI and HF .acids, while the dopants which are internally trapped are trapped. The amount of incorporated dopants, the size of the inclusions, and their chemical composition can be influenced by the reduction conditions within certain limits. About 100-150ppm K, 60 -100ppm/ Al, and 200-300 ppm Si commonly remain in the acid-washed powder.

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