注射成形高比重合金的致密化与变形控制  

Densification and distortion control of W-Ni-Fe molded parts

作　　者：范景莲[1] 曲选辉[1] 黄伯云[1] 温宏宇[1] 郭萍 

机构地区：[1]粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2000年第3期167-171,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金;国家"863"高新技术资助项目

摘　　要：研究了注射成形高比重合金的致密化和变形行为,实验表明在液相烧结过程中,由于重力的作用导致粘性流动,样品发生变形,对W含量较高的合金,采用2步烧结工艺可以有效地控制变形,在此工艺中,压坯首先在粘结相熔点温度以下烧结,形成W连通骨架,然后在高于粘结相熔点以上的温度下烧结较短时间以达到全致密,对于W含量较低的高比重合金,将原始混合粉末采用机械合金化,然后再进行固相烧结,可以得到性能很好的无变形合金。The densification and distortion behaviors of PIM tungsten heavy alloys were studied. Distortion of the sample takes place during liquid phase sinteting due to large difference in density between W phase and liquid phase. Two step sintering process can effectively decrease the distortion for the alloys with higher tungsten contents. For the alloy with low tungsten contents, the powder mixture can decrease the sinteting temperature of the alloy for full densification with good mechanical properties.

关 键 词：注射成形 W-NI-FE 变形 致密化 

分 类 号：TF124.39[冶金工程—粉末冶金]