Compaction of Complex Shape Parts with Core by High-speed Centrifugal Compaction Process (Part 2)

— Fabrication of Tiny and Multiple Holed Nozzle for Diesel Engine —

Abstract

High-Speed Centrifugal Compaction Process (HCP) is a kind of wet compacting method for fine powders suitable for net shape fabrication of complex shape parts with hollow spaces. In the present study, we aim to develop diesel engine fuel injection nozzles using this technique. A plastic core with multiple thin bars (which become nozzle holes) are buried into fine metallic powder compact by the HCP. Then, the core and binder resin in the green compact are thermally decomposed in a vacuum furnace. We developed a proper procedure for de-binding. The de-binded compacts can be sintered uniformly to the relative density of 96 %, having sufficient strength for fuel injection.