Discrete element simulation of metal ceramic composite materials with varying metal content
Metal–ceramic composite materials are used in several fields of industrial applications. Most of the composites are particulate composites, where metal is the matrix and ceramic the reinforcing particulate material. Oxide dispersion strengthened alloys show increased temperature stability compared to the pure alloy. Theoretical models describing the densification evolution during sintering are only available for particle reinforced materials, but there are no models developed for interpenetrating structures, when both phases are sintering.
We present a modelling approach based on the discrete element method, which can be used to investigate the sintering behavior on the whole range of powder metallurgical producible composites. The discrete element method takes the particulate structure of the powder compact into account and allows one to perform detailed modelling of each contact separately. In this paper the metal fraction was varied between 100 and 0 vol.% and the densification was analyzed by the contact radius evolution.
Keywords:Discrete element method (DEM), Sintering, Composites, Metal/ceramic, Alumina