脉冲放电烧结纳米WC-10%Co粉  

ELECTRIC-DISCHARGE COMPACTION OF NANOCRYS- TALLINE WC-10%Co POWDERS

作　　者：吴稀勇[1] 张伟[1] 汪伟[1] 杨菲[1] 闵家源[1] 郭敬东[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2004年第9期1000-1004,共5页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展规划G1999065009;国家自然科学基金90206044资助项目

摘　　要：以喷雾转化工艺(SCP)制备的纳米WC-10％Co(质量分数)粉为原料,应用脉冲放电烧结方法(EDC)制备出平均晶粒尺寸为120 nm左右的超细晶WC—Co硬质合金,并对样品的微观组织结构与力学性能进行了分析.结果表明,EDC方法极短的烧结时间是抑制晶粒长大的重要原因.除裂纹桥联机制外。WC-10%Co (mass fraction) cemented carbide with an average grain size of 120nm are fabricated by means of electric-discharge compacting (EDC) the nano-crystalline WC-10%Co powders which were synthesized by spray conversion process (SCP). Microstructure and mechanical properties of the cemented carbide are investigated. Because of short holding time during EDC, the grain growth is retarded. It is found that the dispersed micro-size pores are contributed to the high fracture toughness of the samples besides the bridging ligament mechanism.

关 键 词：WC-CO 纳米材料 脉冲放电烧结 力学性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—合金]