Conference Presentation (Plenary/Keynote)

FZJ-2019-03014

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png THERMAL RUNAWAY, DYNAMIC STABILITY AND PROCESS CONTROL IN FLASH SINTERING

Pereira da Silva, J. G. (Corresponding author)FZJ* ; Cao, C.FZJ* ; Mishra, T. P.FZJ* ; Mücke, R.FZJ* ; Guillon, O.FZJ*

2019

Abstract: Flash sintering is an innovative sintering method in which a critical combination of electrical field and temperature triggers a sudden densification in seconds. Due to the nature of the process, the flash sintering conditions lead to a non-linear conductivity surge followed by current control. This work tries to answer some questions related to process control during flash sintering by using a dynamic system model-based approach. An explicit solution for the folding points in the voltage control mode is presented (Figure 1). The analytical model uses a dynamic bifurcation approach which explains why the current control mode always leads to a steady state, due to the unicity of the solution to the equations, and why different modes of flash sintering such as current-controlled or power-controlled lead to a more uniform process. The model is validated with experiments in Cerium Oxide doped with Gadolinium and Yttrium.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)
2. DFG project 274005202 - SPP 1959: Manipulation of matter controlled by electric and magnetic fields: Towards novel synthesis and processing routes of inorganic materials (274005202) (274005202)

Appears in the scientific report 2019

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