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ABSTRACT
In this research, green porous mullite ceramics with high porosity, high strength and low thermal conductivity were fabricated by using insulator waste as the main raw material. The effects of sintering temperature on linear shrinkage rate (LSR), bulk density, apparent porosity, cold crushing strength (CCS), mean pore diameter and thermal conductivity of the porous mullite ceramics were investigated. As the sintering temperature increased from 1300o to 1500oC at intervals of 50oC, the LSR initially decreased from 1300o to 1400oC, and then increased from 1400o to 1500oC, while CCS and thermal conductivity increased constantly from 3.2 to 8.5 MPa and from 0.187 to W.m–1.K–1 respectively. Meanwhile, the crystallization and morphology of the mullite grains were optimiz ed wit h t he incr easing sintering temperature. Comprehensive properties of specimens can be adjusted by changing the sintering temperature.
GRAPHICAL ABSTRACT
