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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 3    September 1999

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Solvent de-binding of water-soluble binder in powder injection moulding
Li Songlin(李松林), Huang Baiyun(黄伯云), Qu Xuanhui(曲选辉), Li Yimin(李益民)

State Key Laboratoryfor Powder Metallurgy,Central South University of Technology, Changsha 410083, P.R.China

Abstract:The solvent debinding of water-soluble binder in powder injection moulding (MIM) was investigated systematically, including the effects of solvent types, temperature and the thickness of green parts on the solvent debinding rate. After studying the debinding of a green part with a thickness of 4.26mm, it was found that, the debinding rate of polyethylene glycol(PEG) in water and alcohol was high initially, and then decreased; however, it would increase with temperature increasing. At room temperature, the dissolution rate of PEG in water was higher than that in alcohol, but the latter would be much faster with temperature increasing because the debinding activation energy in alcohol was 51.44 kJ·mol-1·K-1, much higher than 24.23 kJ· mol-1·K-1 in water. With a green part thickness larger than 4.26mm, the debinding was controlled by diffusion; but with that smaller than 2.36 mm, the debinding was controlled by both dissolution and diffusion.

 

Key words: powder injection moulding; water-soluble binders; solvent debinding

ISSN 1672-7029
CN 43-1423/U

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