(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 以93W-Ni-Fe粉末擠壓成形坯為研究對象，在研究溶劑脫脂動力學的基礎上，考察溶劑種類、溶劑加入方式以及脫脂溫度對溶劑脫脂過程的影響，并對脫脂前后的坯體斷口進行SEM觀察。結(jié)果表明：以正庚烷作為脫脂溶劑，具有較高的脫脂率，脫脂坯無鼓泡、開裂等缺陷；通過分段優(yōu)化的脫脂工藝，在45 ℃的正庚烷中脫脂8 h，脫脂過程中周期性更換溶劑，最終可脫除65%以上的石蠟，且整個脫脂過程均為擴散控制，相應的動力學參數(shù)為1.6751×10−5 cm2/s。
關鍵字:
（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
