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 %.

中文翻译：

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前驱体中的磷杂质对镁热钨粉特性的影响

摘要

我们研究了通过在700至800°C的温度下还原含0.05-1.5 wt％磷的MgWO ₄和Ca ₃ WO ₆钨酸盐制备的钨粉。含磷量小于0.3 wt％的MgWO ₄的还原伴随着反应产物的分离。形成的大多数氧化镁位于反应区之外。通过还原MgWO ₄制备的钨粉由α-W组成。通过还原Ca ₃ WO ₆制备的粉末温度低于740°C时，由α相和β相的混合物组成。增加起始钨酸盐中磷的百分比导致β相的百分比增加。粉末的最高β-W含量为60重量％。