This title appears in the Scientific Report : 2019 

THERMAL RUNAWAY, DYNAMIC STABILITY AND PROCESS CONTROL IN FLASH SINTERING
Pereira da Silva, Joao Gustavo (Corresponding author)
Cao, Chen / Mishra, Tarini Prasad / Mücke, Robert / Guillon, Olivier
Werkstoffsynthese und Herstellungsverfahren; IEK-1
2019
Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities, Tomar (Portugal), 2019-03-10 - 2019-03-15
Conference Presentation
SPP 1959: Manipulation of matter controlled by electric and magnetic fields: Towards novel synthesis and processing routes of inorganic materials
Methods and Concepts for Material Development
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.