|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
||On the Role of Electric Current in Spark Plasma Sintering of Conductive Powders
||Geuntak Lee, Eugene Olevsky, Joanna McKittrick
|On-Site Speaker (Planned)
Previous studies indicate that heat conduction via the Joule heating directly influences the densification of conductive powders during spark plasma sintering (SPS) process. However, the effect of electric current on SPS was not clarified mainly due to the difficulty of the deconvolution of the Joule heating and possible non-thermal field phenomena. In the present work, three different experimental setups are utilized to overcome this obstacle. One setup restricts the electric current flow through the powder, and the other two setups allow small or large amount of the electric current passing through the powder specimen. All the three setups are employed under the same SPS temperature regime. The constitutive equations for the hot pressing of powders are modified to take into account the electric current effect on SPS. We found that electric current accelerates mass transfer during SPS, affecting the activation energy and densification mechanism of powder consolidation.