Abstract: The MgAl₂O₄-LaCrO₃ insulator materials for the microwave sintering of electronic oxide
ceramics were made by the mixing of MgAl₂O₄ spinel materials with superior thermal properties and LaCrO₃ perovskites materials with high efficiency
absorption of microwave. The samples for microwave sintering were placed in the enclosure made of the insulator materials, and the outer insulator enclosure
were made of Al₂O₃ ceramic and Al₂O₃ fiber materials. Due to the thermal protection to the samples during the microwave sintering and especially
in the rapid cooling procedure, the design of this kind insulating system solved the problems of thermal cracks often occurred in the microwave sintering of many
electronic oxide ceramics, such as CoMnNiO series NTC ceramics, BaTiO₃ based PTC, LaCrO₃-based ceramics, and produce a homogeneous heating for the samples in
the microwave sintering, and gain crack-free and dense ceramic samples. The highest temperature of the MgAl₂O₄-LaCrO₃ insulator materials applied can be up to 1600℃.

Key words: electronic oxide ceramics, MgAl₂O₄-LaCrO₃ insulators, microwave sintering