Effects of pyrolusite additive on the microstructure and mechanical strength of corundum–mullite ceramics
作者： Xiangchen Kong , Yuming Tian , Yuesheng Chai , Pengfei Zhao , Kaiyue Wang
DOI: 10.1016/J.CERAMINT.2014.11.116
关键词: Sintering 、 Metallurgy 、 Materials science 、 Ceramic 、 Solid solution strengthening 、 Compressive strength 、 Microstructure 、 Mullite 、 Grain boundary 、 Pyrolusite
摘要: Abstract Corundum–mullite ceramics have been successfully synthesized by using the raw materials of bauxite and kaolin clay. The effects pyrolusite additive on microstructure mechanical strength corundum–mullite duplex were systematically investigated. results show that exhibit optimal performance with amount 4 wt% additives at 1350 °C. liquid glass phases appear during sintering process due to presence impurities in powder, which is beneficial growth crystal, gap decrease grain boundary pores, improvement compressive strength. Moreover, component MnO 2 could lead distortion lattice, further improve via a solid solution strengthening mechanism.
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