93W-Ni-Fe粉末挤压成形坯溶剂脱脂工艺

Solvent debinding processing of 93W-Ni-Fe powder extrusion molding compacts

以93W-Ni-Fe粉末挤压成形坯为研究对象,在研究溶剂脱脂动力学的基础上,考察溶剂种类、溶剂加入方式以及脱脂温度对溶剂脱脂过程的影响,并对脱脂前后的坯体断口进行SEM观察。结果表明:以正庚烷作为脱脂溶剂,具有较高的脱脂率,脱脂坯无鼓泡、开裂等缺陷;通过分段优化的脱脂工艺,在45℃的正庚烷中脱脂8 h,脱脂过程中周期性更换溶剂,最终可脱除65%以上的石蜡,且整个脱脂过程均为扩散控制,相应的动力学参数为1.6751×10-5 cm2/s。

Based on the kinetics of solvent debinding,the effects of different solvents,adding method and debinding temperature on the solvent debinding process of 93W-Ni-Fe powder extrusion parts were investigated,and the morphologies of the fractured rod before and after debinding were analyzed by SEM.The results show that,when the n-heptane is used as a debinding solvent,a higher debinding rate is obtained,as well as the debound parts without blisters,cracking and other defects.Besides,when the green parts are immersed in n-heptane at 45 ℃ for 8 h,the debinding using subsection optimization process with periodic replacement of debinding solvent,and the debinding process is fully controlled by diffusion,the corresponding kinetic parameter is 1.6751×10-5 cm2/s.