The general process of brown tungsten oxide is to roast ammonium paratungstate into tungsten trioxide in air at about 500°C, or slightly reduce it to blue tungsten oxide in hydrogen at about 450°C. To make the tungsten filament of an incandescent lamp, it is necessary to add a small amount of potassium oxide, silicon oxide and aluminum oxide to tungsten trioxide or blue tungsten oxide, and the total amount of the three should not exceed 1%. Silk doping process. The doped tungsten oxide is reduced to metal tungsten powder with hydrogen. The reduction process is generally carried out in two steps: the first step is reduced to tungsten dioxide (brown tungsten oxide) at about 630°C, and the second step is reduced to metal tungsten powder at about 820°C.
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