Abstract
Extraction method using supercritical carbon dioxide is an efficient and safe extraction method, and began to use many industrial fields. Supercritical fluid has high density like liquid and low viscosity like gas. It can solve solute like liquid and it can go into porous body like gas. Carbon dioxide becomes supercritical state at relatively low temperature and low pressure, and it is harmless to human health and environment. This extraction method is adopted to the debinding process of metal injection moulding (MIM). On this method, powder is mixed with binder and parts are moulded by injection moulding. After moulding, binder is removed from the parts and these are sintered. On these processes, the debinding process is most difficult and time consuming. On conventional thermal debinding, it need several days for debinding process, and it is difficult to produce the part which has the thickness more than 10 mm. Applying this extraction method to the debinding process, production of large parts is possible.
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