(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 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。
关键字:
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: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.
Key words: 93W-Ni-Fe powder; powder extrusion molding; solvent debinding; kinetic parameters; mechanism model
