摘要
共沉淀回收W—Co复合粉末的还原料在固相碳化过程中,低温下由Co_3W和Co_7W_6向η型碳化物转化,高温(900℃以上)下由η型碳化物转化为共生的β—Co和粗晶WC,该粗晶WC是导致用这种回收料生产的合金中具有超常粗大的WC晶粒的原因。在600～1100℃由W和C直接生成和在750～1100℃由W_2C和C生成细晶WC(<0.2μm)。由于低温下不存在游离态Co对W粉碳化过程的催化作用,即使在1200℃下也难以完成碳化过程。
In the process of solid phase carburization of the reduced W-Co composite powder recycled by co-precipitation was converted from Co_3W and Co_7W_6 to η type carbides at low temperature and was converted from η type to co-grown β-Co and coarse WC crystals at high temperature (over 900℃), the coarse WC crystals were the cause of the formation of super coase. WC crystals in the alloys produced by these recycled materials. Fine WC crystals (<0. 2μm) were directly formed from W and C at 600～1100℃ and produced from W_2C and C at 750～1100℃. There was no catalytical effect of free Co phase on carburization at low temperature. The carburization process could not be completed even if at 1200℃.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
1993年第4期260-265,共6页
Powder Metallurgy Technology
关键词
共沉淀
回收
碳化
钨钴复合粉末
hard alloy co-precipitation recycled W—Co composite powder carburization
