金属粉末射出成形における埋込み脱脂

概要

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For shortening debinding times on the metal injection molding, the thermal debinding method with burying process was investigated. The powders made up by the mixture of reduced iron powder (d:70μm), carbonyl iron powder (d:6.4μm) and carbonyl nickel powder (d:9.3μm) were used. The carbon powders(0.2wt%) were used as the luburicant for the powders. And the montan wax and the polyethylene wax were used as binder. The green bodies buried in the zirconsand were debinded under heating from room tenperature to 450°C in N2 flow(0.5 ?? /min). The debinding times were from 9 hour to 22 hour. Then the debound bodies were sintered at 1100, 1180 and 1250°C in H2 atomosphere with heating rate of 1000°C/h. As the results, about 90 wt% binders were dibined and then the sintered parts at 1250°C showed the relative density of 80-87%, the elongatione of 2-7%. the tensil strength of 19-27Kgf/mm2 and the hardness of 71-94(HRF).
社団法人粉体粉末冶金協会の論文