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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Pore opening and binder flow during initial stage of thermal debinding in MIM
ZHAO Li-gang(赵利刚)1, LI Yi-min(李益民)1,2

1. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China;
2. Hunan Injection Hi-Tech Ltd Changsha 410083, China

Abstract:Pore opening and binder flow during the initial stage of thermal debinding in metal injection molded parts was investigated. Scaning electron microscopy(SEM) pictures of 316L stainless steel parts using wax-based binder show that small particles will move to the surface with the process of debinding. SEM pictures of different mass loss rate specimens indicate that initial pores will emerge when as little as 4% binder removes. During the initial stage of thermal debinding, vapor tension varies in different place due to the difference of curvature. Thus more binders will be removed in places with smaller cavity between metal powders, and in these places small openings emerge.

 

Key words: metal injection molding; thermal debinding; pore opening; binder flow

ISSN 1672-7029
CN 43-1423/U

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