氧化钨氢还原动力学的研究进展

Research progress on hydrogen reduction kinetics of tungsten oxide

超细钨粉是目前制备多种硬质合金和结构材料的重要原料,其主要制备方法为氢还原法.在对大量文献资料进行查阅及分析的基础上,综述了氧化钨氢还原动力学的研究现状,包括氧化钨氢还原的基本原理、不同动力学条件下的还原历程以及物相转换.介绍了国内外学者在不同钨氧化物的氢还原过程中,通过改变动力学参数对产物钨粉的粒度、形貌、结构和性能的影响,以及实际工业生产的现状和存在的问题.重点介绍了目前氢还原动力学的几种模型及其方程,并对可能适用于氧化钨氢还原动力学研究的动力学模型进行了展望.

Ultrafine tungsten powder is an important raw material for making a variety of cemented carbide and structural materials.The main method to make it is through hydrogen reduction.Based on the review and analysis of a large amount of literatures,the research status of hydrogen reduction kinetics of tungsten oxide was reviewed,including its basic principle,the reduction process under different kinetic conditions and phase conversion.This paper introduced the effects of changing kinetic parameters on the particle size,morphology,structure and properties of tungsten powder when domestic and foreign scholars were dealing with the hydrogen reduction of different tungsten oxides,as well as the present situation and problems in practical industrial production.Several models and their equations of hydrogen reduction kinetics were introduced,and the kinetic model which may be applied to the hydrogen reduction kinetics of tungsten oxide was prospected.