Fabrication of tungsten powder with sodium tungstate as raw material by SHS method

摘要

Tungsten powders were fabricated by Self-propagating High-temperature Synthesis (SHS) method with sodium tungstate (Na_2WO_4) and magnesium (Mg) as raw reactants. The effect of the molar ratios of Mg/Na_2WO_4 on the compositions of combustion products was investigated. The results show that, it is advantageous for more Mg in the raw reactants than the stoichiometric quantity to decrease the impurities in the combustion products and increase the completeness of the synthesis reaction of tungsten. At last, tungsten powders can be obtained after the acid enrichment and distilled water washing.