YG8硬质合金注射成形脱脂工艺的研究  

Debinding Process of Cemented Carbide Green Part by Powder Injection Molding

作　　者：范景莲[1] 李志希[1] 肖琼[1] 刘涛[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》2005年第6期803-809,共7页Chinese Journal of Rare Metals

基　　金：国家十五"863"项目(2002AA331090)

摘　　要：采用传统蜡基粘结剂和(油+蜡)基改进粘结剂两种粘结剂,对粒度为1.97μm的WC-8Co混合粉末注射成形,研究了两种喂料的热脱脂、溶剂脱脂+热脱脂工艺,确定了热脱脂、溶剂脱脂+热脱脂的优化工艺曲线。从脱脂速度和脱脂时间、脱脂缺陷和脱脂工艺控制的难易程度等方面比较了两种粘结剂的热脱脂和溶剂脱脂效果。研究了热脱脂温度、时间不同脱脂方式以及粘结剂组成对脱脂坯碳含量的影响。结果表明,以氢气为脱脂气氛,在450℃以下进行热脱脂可以将有机聚合物完全脱除而且不产生脱碳,溶剂脱脂后再进行热脱脂更有利于控碳和减少脱脂缺陷,而且大大缩短脱脂时间。(油+蜡)基改进粘结剂在热脱脂和溶剂脱脂时具有更好的脱脂特性。By using a traditional multi-component binder and a kind proved binder, the WC-8Co powder paraffin wax base of （ wax ＋ oil） im mixture with particle size of 1.97μm was injected by powder injection molding. The thermal debinding process and solvent ＋ thermal debinding combined process were studied to determine the optimal debinding processes. The efficiency of the two binders on thermal debinding and solvent debinding was compared in inspect of debinding rate, defects of the brown parts and debinding process. The influences of thermal debinding temperature, time, different debinding methods and bindercomponent on the carbon content of the brown parts also was studied. The results showed that, when the green part is thermally debinded below 450 ℃ under H2 atmosphere, the polymer binder in the green part can be removed completely without Carbon loss in WC powder. Solvent debinding before thermal debinding has advantage in controlling carbon content of the brown part and defects, and the debinding time is shortened greatly. The （wax ＋ oil） improved binder has better debinding characteristics during thermal debinding and solvent debinding.

关 键 词：硬质合金 注射成形 热脱脂 溶剂脱脂 

分 类 号：TG135.5[一般工业技术—材料科学与工程]