硬质合金注射成形脱脂工艺与碳含量控制  

Debinding Process and Carbon Content Control of Hardmetal Components by Powder Injection Molding

作　　者：范景莲[1] 李志希[1] 成会朝[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2006年第1期74-77,共4页Rare Metal Materials and Engineering

摘　　要：将传统蜡基粘结剂和油+蜡改进粘结剂体系分别与粒度为1.97μm的WC-8Co硬质合金粉末混合采用注射成形法制备了全致密高强度的硬质合金。研究了注射坯在H2中的热脱脂工艺和溶剂脱脂与其后补充热脱脂工艺,和不同脱脂工艺对脱脂坯碳含量的影响。结果表明:油+蜡改进粘结剂体系具有更好的热脱脂和溶剂脱脂行为。通过工艺优化和碳含量控制,在真空气氛下1400℃烧结80min制备出高抗弯强度的全致密硬质合金烧结制品。A fully dense wc-gCo hardmetal component, which used a kind of traditional paraffin wax based multicomponent binder and a kind of improved oil＋paraffin wax based binder, was manufactured by metal injection molding process. The process of thermal debinding in hydrogen atmosphere, solvent debinding in heptane and subsequent thermal debinding in hydrogen almosphere were studied. The results show that the improved oil-paraffin wax based binder had better thermal and solvent debinding characteristics. Through the optimization of debirtding process and the carbon content control during debinding, the fully dense WC-8Co hardmetal with good bending strength is manufactured afier the brown part is sintered at 1400℃ for 80 minutes in vacuum atmosphere.

关 键 词：硬质合金 注射成形 脱脂工艺 碳含量 

分 类 号：TF124.39[冶金工程—粉末冶金]