Solvent de-binding of water-soluble binder in powder injection moulding

来源期刊：中国有色金属学报(英文版)1999年第3期

论文作者：李松林 黄伯云 曲选辉 李益民

文章页码：578 - 581

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

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.