Abstract
Because of its high potential for near-net shape manufacturing, metal powder injection molding (MIM) has attracted a growing attention recently. The MIM technique generally consists of the following four processes: metal powder-liquid binder mixing, injection of mixed medium into molds, debinding and sintering. Each MIM process has its peculiar problems to be overcome. This study is one of the approaches for obtaining clues for the optimization of the injection (molding) process, in which the mechanical properties of mixed 2-phase medium play an important role. This medium is supposed to have a unique properties for pressure transmission behavior, where Pascal's principle of isotropic pressure transmission may not be applied. That is, the pressure in the horizontal direction is not always equal to that in the vertical direction. In this paper a model for the pressure transmission property of the mixed 2-phase medium is considered. The present model predicts a variety of pressure distributions, depending on the parameters set considered here. The model reduces to Janssen's formula when the medium consists of solid particles and to the well known hydrostatic pressure distribution when it consists of liquid. In addition to theoretical work, a preliminary experiment is carried out. The experimental results seem to support the basic idea of the model.
Published Version
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