Difference of graphitization of polymer in the gelcasted bodies using alumina and silica as matrices

概要

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We have been developing a new route in synthesizing conductive alumina through gel casting method and then sintered in an inert environment. In this study, we fabricate a semi-conductive ceramics utilizing silica as the matrix and investigate the effect of this matrix on the basic properties for a semi-conductive ceramic body. The results were then compared to the gelcast alumina body sintered under inert atmosphere. Synthesize gelcast silica body gave a higher relative density and lower conductivity if compared to the gelcast alumina body sintered under inert atmosphere. This is because the gelcast silica during sintering, some silica matrix component attached to nano-carbon network (originating from polymers) form a SiC under inert atmosphere. This carbon-consuming process causes defects which inhibits graphitization and structural disorder onto the gelcast silica body.
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