The debinding process of injection molded Fe-8%Ni mixed powder compacts containing binder of different compositions of polymers to waxes was investigated, and the effect of the binder compositions and debinding conditions on the sinterability of the compacts were developed.
It was shown that the distortion in debinding was minimum when the ratio of polymer to the total binder contents was 0.35. When debinding in air above 280°C, the binder removal(%) of compacts began to decrease with increasing temperature, and the compacts exhibited considerable shrinkages, while in N2 atmosphere, the binder removal(%) increased with temperature and the compacts exhibited some swelling. In the case of compacts debound in air, the sintered densities increased with increasing the debinding temperature up to 350°C then decreased rapidly at the higher temperature. On the other hand, debound in N2, the sintered densities were not so changed by the debinding temperature and showed remarkably lower values compared with the compacts debounnd in air, below the debinding temperature of 350°C.