摘要
开发出了适用于硬质合金挤压成形的成形剂及相应的热脱脂技术 ,通过优化配方设计与制备方式及工艺条件 ,制得了性能优良 ,分布均匀的成形剂。研究了成形剂及喂料的热脱脂工艺与机理 ,发现热脱脂可分为低温区与高温区 2个阶段 ,其脱脂机理均为热扩散 ,但 2阶段热脱脂反应活化能不同 ;无论是成形剂还是喂料 ,其它组元的加入起了催化剂的作用 ,能有效地降低热脱脂反应活化能。
A kind of binder technology for extrusion molding of hardmetal powder has been developed. By optimizing the binder formulation design and its fabrication method and technical conditions, the novel binders, with excellent properties and uniform distribution, were manufactured. The thermal debinding processes and its mechanism of hinder and feedstock have been studied. It is found that the thermal debinding can be divided into two stages, e.g. the low temperature stage and the high temperature stage. And their thermal debinding mechanism is the mechanism of thermal diffusion, but the thermal debinding activation energies are different in the two stages. The results show that adding of other components acted as a catalyzeing in either binder or feedstock, and can decrease effectively the activation energy of thermal debinding processes.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2002年第3期225-228,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助项目 (5 963 412 0 )
关键词
硬质合金
挤压成形
喂料
热脱脂
hardmetal
powder extrusion molding
feedstocks
thermal debinding
