Abstract
Effects of sintering atomospheres on the sinterability of injection molded compacts were investigated. The results obtained were as follows.
1) The sintered density of the injection molded compacts increased with increasing reducing ability in the sintering atmospheres, however this increase was about one third of that of the conventional P/M compacts.
2) In the case of Fe-8Ni injection molded compact, preheating at 450°C for 1 hr. in H-atmosphere enabled to densify it to the relative density of 95% in the subsequent sintering even using the inert gas atomosphere such as pure N2. Whereas the compact without the preheating was not densified unless the ratio of H2 to the H2/N2 gas mixtures exceeded 40 vol %.
3) On the other hand, the sintered density for the case of SUS316L compact was almost same, e.g. the relative density of about 93-94%, with or without the preheating treatment.
