Abstract
Controlling the grain growth of ceramic powders is an interesting technological development. Due to the large aspect ratio, the packing of ceramic nanoplates during sintering may significantly improve the microstructure, which induces higher mechanical performance. In the present work, we successfully fabricated the Al2O3 nanoplates by colloidal processing using graphene oxide (GO) as a template. Al2(SO4)3.18H2O was used as raw materials to deposit amorphous alumina on the GO surface. The phase transformation behavior of Al2O3 nanoplates was evaluated at different temperatures. The thermally stable α˗Al2O3 nanoplates showed limited grain growth after spark plasma sintering (SPS) compared to Al2O3 nanoparticles. The refined microstructure of α˗Al2O3 nanoplates derived alumina ceramic induced higher flexural strength and toughness.
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