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The Influence of Calcium Additive in the Structural Formation of Tungsten via Reduction Reaction

With the processes of solution doping and hydrogen reduction process, the raw materials APT powder was converted into the tungsten with calcium additive. Micro-morphology, micro-structure, the existing form of element calcium and their distribution were examined by SEM, HRTEM and EDS. The results show that Element calcium is mainly in the form of CaWO4 in tungsten oxide powder and has two calcium tungstate forms which are CaWO4 and Ca4.26W10O30 in reducing tungsten powder. The Ca-W-O particles are embedding in the tungsten powder particles; the rest distribute between the tungsten powder particles.