Applied electric field and holding time have a great influence on the properties of flash sintered ceramic materials.In this study,the effects of applied electric field and holding time on the microstructure densification of flash sintered ultra-high purity Al2O3 were investigated,and the densification mechanism of ultra-high pure alumina flash sintering process is analyzed based on the classical densification theory.When electric field intensity increased from 5000 to 7000 V/cm,the density of the flash samples increased from 91.2%to 96.4%,the hardness increased from 16.87 to 18.65 GPa.The holding time prolong from 1 to 60 s,the density,hardness of the flash sintered samples increased.The SEM results showed that the grain size of the samples increased from 228 nm to 370 nm when the holding time increased from 1 s to 90 s.
ultra-high pure aluminaflash sinteringelectric fieldholding time
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