Effect of Phosphorus Impurities in Precursors on Characteristics of Magnesiothermic Tungsten Powders
Source abstract
Abstract
We have studied tungsten powders prepared by reducing the MgWO4 and Ca3WO6 tungstates containing 0.05–1.5 wt % phosphorus at temperatures from 700 to 800°C. The reduction of MgWO4 containing less than 0.3 wt % phosphorus was accompanied by separation of reaction products. Most of the magnesium oxide formed was located beyond the reaction zone. The tungsten powders prepared by reducing MgWO4 consisted of α-W. The powders prepared by reducing Ca3WO6 at a temperature below 740°C consisted of a mixture of the α- and β-phases. Raising the percentage of phosphorus in the starting tungstate led to an increase in the percentage of the β-phase. The highest β-W content of the powder was 60 wt %.
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Research context
OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Advanced materials and composites · Advanced ceramic materials synthesis
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References (14)
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