VC,Cr_3C_2对WC-Co纳米粉烧结性能的影响  

Influence of VC, Cr_3C_2 on Sintering Properties of Nanocrystalline WC-Co Composite Powders

作　　者：史晓亮[1] 邵刚勤[1] 段兴龙[1] 张国强 张卫丰[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]广州经济技术开发区建筑工程质量检测站,广州510530

出　　处：《北京科技大学学报》2004年第6期612-615,共4页Journal of University of Science and Technology Beijing

基　　金：中国博士后科学基金(No.2003034504)武汉理工大学材料复合新技术国家重点实验室开放基金(No.2004-2005)国家863纳米材料专项(No.2002AA302504)武汉理工大学校基金(No.2003XJJ202)资助项目

摘　　要：研究了WC-10Co纳米复合粉的热压烧结,确定合理的烧结温度为1360℃.在纳米WC-10Co复合粉中分别掺杂1.0％VC和1.0％Cr3C2(质量分数),根据烧结体的断裂强度、洛氏硬度等性能和断口形貌,研究了晶粒生长抑制剂VC,Cr3C2对纳米复合WC-10Co粉末烧结性能的影响.结果表明,纳米WC-10Co复合粉掺杂1.0％VC或1.0％Cr3C2,在1 360℃烧结,可以得到晶粒度小于300nm的整体性能较好的超细WC-Co硬质合金,掺杂1.0％VC抑制晶粒生长的效果要好于掺杂1.0％Cr3C2.Nanocrystalline WC-10Co composite powders were sintered by hot-press sintering at 1360℃. The influence of 1.0% VC and 1.0% Cr3C2 (mass fraction) growth inhibitors on the sintering properties of the composite powders was investigated according to the transverse rupture strength (TRS), Rockwell A hardness (HRA) and the scanning electron microscopy (SEM) micrographs of the fractured surfaces of specimens. The result shows that the inhibiting grains growth effect of 1.0% VC is better than that of 1.0% Cr3C2. When nanocrystalline WC-10Co composite powders doped by 1.0%VC or 1.0% Cr3C2 (mass fraction) are sintered at 1360℃, ultrafine WC-10Co cemented carbide with an average grain size of less than 300 nm and better properties are achieved.

关 键 词：纳米 WC-Co复合粉 热压烧结 晶粒生长抑制剂 硬质合金 

分 类 号：TF125.2[冶金工程—粉末冶金] TG135.5[冶金工程—冶金物理化学]