Electrical field assisted densification investigated by sinter-forging

Reference Presenter Authors
12-050 Olivier Guillon Guillon, O.(Forschungszentrum Jülich GmbH); Mücke, R.(Forschungszentrum Jülich GmbH); Cao, C.(Forschungszentrum Jülich GmbH); Recent developments in the science of sintering have enabled to reduce considerably the energy required to densify ceramic materials, by dramatically shortening sintering times and decreasing sintering temperatures. Beyond standard FAST/SPS (Field Assisted Sintering Technique / Spark Plasma Sintering) limited to a few volts while at the same time applying moderate to large uniaxial mechanical pressures, the role of an electric field on the densification and coarsening of oxide ceramics is still under debate. By using an instrumented sinter-forging equipped with a separate power source, it is possible to quantify and rationalize such effects on densification rates, sintering parameters as well as the microstructure of oxide ceramics. Sintering parameters such as sintering stress and viscosity are measured without electrical field and with electrical field.
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