FAN Xiaozheng ^{1, 2}, YAN Yun ^{1, 2}, HU Zhihua ^{1, 2}, LI Liping ^{1, 2}, ZHAO Chunying ^{1, 2}

(1.State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China; 2. Key Laboratory for Advanced Building Materials of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China)

Abstract: High-strength absorbing microwave ceramics was prepared using low-grade pyrite cinder as raw material through high temperature sintering in reducing atmosphere. The effect of moulding pressure, sintering temperature, holding time and dosage of mineralization agent on the strength and absorbing efficiency of the ceramic was investigated. The research results show that the strength of the ceramic increased with the increasing of moulding pressure, sintering temperature, holding time and the added amount of the mineralization agent. The effect of the preparation parameters on the absorbing efficiency of the ceramic is the same as on the strength. The ceramic’s temperature can reach 823 ℃ in a microwave environment in one minute, and the strength can attain to 105.5 MPa when the ratio of the reducing agent and pyrite cinder was 0.1 at 1450 ℃ for 60 min with 5% dosage of CaF₂.

Key words: pyrite cinder; absorbing ceramic; absorbing efficiency