碳辅助氢还原制备纳米钨粉工艺及机理.docx

ABSTRACT
and Cr2O3 are helpful to inhibit the growth of tungsten nano-powder during reduction. When the content of inhibitors increases from 0 to %, the mean particle size of tungsten powders which is prepared by the mixure with tungsten carbon molar rate of 1: by hydrogen reduction decreases from 46 nm to 41 nm, there is no apparent effect of the content of addition on mean particle size of tungsten nano-powders while adding addition continuously. The growth mechanism of tungsten powder also is atomic diffusion mechanism, when the content of addition increases from 0 to %, the nucleation size of tungsten powders decreases from to , there is no apparent effect of the content of addition on particle growth factor.
Key Words: tungsten nano-powders; carbon assisting hydrogen reduction; inhibitors; growth mechanism
目 录
第一章 绪论...............................................................................................................1
研究背景.........................................................................................................1
钨粉的应用.....................................................................................................1
钨粉在 WC-Co 硬质合金中的应用 1
钨粉在钨基高密度合金中的应用.......................................................3
钨粉在 W-Cu 基复合材料中的应用 4
纳米钨粉的制备方法.....................................................................................5
氧化钨粉还原法...................................................................................5
高能球磨法...........................................................................................6
气体蒸发法...........................................................................................7
等离子体法...........................................................................................7
自蔓延高温还原法...............................................................................7
研究的目的、意义及研究内容......................................