Porosity dependence of powder compaction constitutive parameters: Determination based on spark plasma sintering tests

TL;DR

This paper introduces a simplified experimental method using coupled sinter-forging and die compaction tests in SPS to determine powder compaction parameters, accounting for porosity effects on the deformation behavior.

Contribution

It presents a novel, easier approach to determine visco-plastic parameters in powder compaction, reducing reliance on extensive traditional testing.

Findings

The method effectively captures porosity influence on compaction parameters.

It enables in situ analysis of porous structure morphology during sintering.

The approach simplifies the experimental process for powder material characterization.

Abstract

The modeling of powder compaction process, such as spark plasma sintering (SPS), requires the determination of the visco-plastic deformation behavior of the particle material including the viscosity moduli. The establishment of these parameters usually entails a long and difficult experimental campaign which in particular involves several hot isostatic pressing tests. A more straightforward method based on the coupled sinter-forging and die compaction tests, which can be easily carried out in a regular SPS device, is presented. Compared to classical creep mechanism studies, this comprehensive experimental approach can reveal the in situ porous structure morphology influence on the sintering process.