YG8硬质合金的粉末注射成形技术  

Powder injection molding of WC-8%Co cemented carbide

作　　者：祝宝军[1] 曲选辉[1] 陶颖[1] 肖平安[1] 秦明礼[1] 

机构地区：[1]粉末冶金国家重点实验室,湖南长沙410083

出　　处：《粉末冶金材料科学与工程》2002年第3期247-252,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划资助课题(G2000067203)

摘　　要：研究了WC-8％Co硬质合金的粉末注射成形工艺。结果表明:溶剂脱脂+75％N_2/25％H_2混合气体热脱脂工艺,不仅能大幅度提高脱脂速率,而且有利于合金碳含量的控制;提高预成形坯固体粉末体积含量有利于提高制品密度和尺寸精度。在1460℃烧结,保温2 h,PIM硬质合金试样的抗弯强度、硬度、密度分别达到2480MPa,HRA90和14.72 g·cm^(-3);烧结后制品保形性良好,尺寸偏差达到±0.02mm;经金相检查没有发现明显缺陷、石墨夹杂和第三相,合金组织均匀,平均晶粒度为2μm,孔隙度为A02B00。The powder injection molding processing of WC-8% Co cemented carbide was investigated. The results show that the two-step debinding method can not only greatly shorten the debinding time, but also be helpful to the carbon control of the compacts. High powder loading benefits dimension precision and shape retention. The transverse rupture strength, hardness, coercivity and density of the specimens made by PIM are 2480 MPa, HRA89.5, 8.95 kA'm^(-1) and 14.72 g·cm^(-3) respectively. The average grain size was 2μm. The porosity is less than 0.02% and 0.02 mm dimension deviation is achieved.

关 键 词：粉末注射成形 硬质合金 碳 尺寸精度 

分 类 号：TF125.3[冶金工程—粉末冶金]