On-demand Manufacturing Process of Sintered Parts by High-speed Centrifugal Compaction Process using Resin Mold (Part 1)

In High-Speed Centrifugal Compaction Process (HCP), powders are prepared as slips and deposited on bottom of molds under huge (10,000 g) centrifugal force to form green compacts. It looks severe process, but the force acting on the mold is less than several tens MPa. Therefore, the HCP is a mild compacting method from a view points of compacting mold. In the present study, we developed plastic compacting mold for the HCP. The hollow shape in the compacting mold is obtaind by selectively dissolving another plastic mold (master mold) buried in it. For releasing green compact from compacting mold, the whole mold is heated and the compacting mold is thermally decomposed. Proper selection of compacting mold resin, filler and binder resin in green compact makes releasing of the compact stress-free. Released compact can be sintered but minute cracks remains there.