氧化钨氢气还原制备超细钨粉的研究现状

Research status of preparing ultrafine tungsten powders by H_2-reducing tungsten oxide

超细钨粉以其显著的优点,早已成为多种重要功能材料和结构材料的主要原料,但以喷雾干燥法等常规制粉工艺制得的钨粉末均为前驱复合氧化物粉末,必须对其进行氢还原才能最终制备出超细钨基复合粉末或钨基复合材料。为此,该文作者综述了氧化钨及其复合氧化物粉末的还原工艺、原理及不同条件下还原后所得粉末的特性,分析了采用不同特征的氧化钨及其复合氧化物做原料可得到不同性能还原W粉的原因,并对氢气还原过程中粉末粒度及其均匀性的影响等因素进行了详细论述,获得了一些参考性认知。

In spite of superfine tungsten powder has widely used as a kind of principal raw material for a variety of important functional and constructional materials, most of the tungsten powders prepared by conventional processes are the precursory composited oxides powders which should be reduced under hydrogen atmosphere before using for preparing the superfine composites or composited materials. Thereby in the presented paper, the reduction process and mechanism of tungsten oxide and the characteristic of the reduced powder in different conditions are summarized, the effect on properties of the reduced powder prepared with different raw materials are overviewed, and the effect factors of powder grain sizes and the distributional uniformity during HE-reduction process are discussed in detail.