Increase in hardness for flash sintered ceramics
March 10-15, 2019
A study of the hardness values of flash sintered multiphase ceramics was carried out to determine the effect of flash sintering on mechanical property. A three-phase ceramic of equal volume percent of Al2O3, MgAl2O4, and 8YSZ was compared to single phase Al2O3, MgAl2O4, and 8YSZ. Samples were flash sintered with an isothermal furnace temperature of 1450°C, a field of 680 V/cm, and a current limit set to 50mA/mm2. Control samples were made by conventional sintering and two-step sinter forging. Vickers hardness tests were conducted to evaluate hardness as a function of process parameters. Initial results revel an increase of hardness for flash sintered samples compared to conventional sintered and two-step sinter-forged samples. The two-step sinter-forged samples and flash sintered three-phase samples had similar grain sizes and density, and the increase in hardness is hypothesized to be a result of increase point defects resulting from flash sintering.
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David Kok, Martha Mecartney, and Rishi Raj, "Increase in hardness for flash sintered ceramics" in "Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities", Rishi Raj, University of Colorado, USA Olivier Guillon, Forschungzentrum Jülich, Germany Hidehiro Yoshida, National Institute for Materials Science, Japan Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/efe_advancedmaterials_ii/84