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Vol.30, No.12, 1467 ~ 1476, 1992
Title
Metal Injection Molding of Mixed Powder with Coarse and fine Iron Powder
주동원Dong Won Joo, 구광덕Kwang Duk Koo, 성장현Jang Hyun Sung
Abstract
To investigate the applicability of a coarse powder to the metal injection molding, coarse iron podwers were combined up to 60% in weight fraction with fine iron powders in the injection molding process. With increasing relative fraction of a coarse powder, the green density of the compacts increased slowly up to 97% at 60 wt. % addition of coarse powder and it became possible to remove a binder completely out of the compact through the broader channels of binder flow during the debinding stage. The increase in the porosity of the compact owing to the increasing portion of a coarse powder resulted in the decrease in the sintered density and volume shrinkage. And then it brought the tensile strength and elongation of the final product down. In this experiment the maximum amount of a coarse powder replacing a fine powder with the equivalence in densification behavior, microstructure and tensile property to injection molded-fine carbonyl iron powder was found to be 20% in weight fraction.
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