微量Y_2O_3对细晶W-Ni-Fe粉末烧结行为和显微组织的影响  

Influence of trace Y_2O_3 on sintering behavior and microstructure of fine-grain W-Ni-Fe powders

作　　者：祁美贵[1] 范景莲[1] 张骁[1] 刘涛[1] 田家敏[1] 黄伯云[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2009年第4期656-661,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50674106);国家自然科学基金创新研究群体科学基金资助项目(50721003)

摘　　要：采用喷雾干燥-热还原的方法制备纳米级93W-4．9Ni-2．1Fe复合粉末和微量稀土掺杂的复合粉末，研究微量稀土掺杂对烧结致密化和晶粒尺寸的影响。结果表明：微量稀土掺杂能有效地降低该复合粉末的晶粒尺寸，并能改善粉末的分散度；纳米级复合粉木在1380～1410℃液相烧结可实现材料的近拿致密化，比同种成分的传统钨合金的烧结温度降低了120℃左右，合金的相对密度可达99％以上；但微量稀士掺杂对烧结的致密化有一定的抑制作用；同时微量稀土元素对合金的晶粒尺寸的抑制作用主要发牛在液相烧结阶段。Nano-grained W-Ni-Fe composite powders and Y2O3 doped W-Ni-Fe composite powders were fabricated by spray drying and subsequent thermal reduction process. The influence of trace Y2O3 on the sintering behavior of Y2O3 doped W-Ni-Fe composite powders was investigated. The results show that trace rare earth addition can reduce the crystalline size proficiently; The near full densification can be realized in the temperature range from 1 380 ℃ to 1 410℃, which is 120 ℃ lower than the temperature of sintered traditional tungsten heavy alloys. The relative density can achieve 99%, and trace rare earth element restrains the growth of tungsten grain, which happens mainly at the liquid phase sintering.

关 键 词：钨合金 W-Ni-Fe复合粉末 Y2O3掺杂 烧结行为 显微组织 

分 类 号：TG146.4[一般工业技术—材料科学与工程]