Determination of Material Properties and FEM Simulation in Powder Compaction and Sintering of Tiles Having Two Layers of Powders

摘要

The densifiication behaviors in compaction and sintering processes of tiles haiing two layers of powders were simulated by the viscoplastic finite element method. The shrinkage strain-rate and the flow stress of the powders during the sintering required as material constants for the simulation were measured from a simple compression test with constant load. The occurrence of sintering fracture was predicted from the difference of volumetric strain calculated by the finite element simulation. The critical difference of volumetric strain for predicting the occurrence of sintering fracture was obtained from a three-points bending test during the sintering. The accuracy of the simulation was improved by using the flow stress with strain-rate and temperature sensitivities and the shrinkage strain-rate history.