报道了一种用于氧化物电子陶瓷微波烧结的保温体材料MgAl2O4-LaCrO3的研究和应用情况.该保温材料解决了许多氧化物电子陶瓷在微波烧结过程中易发生的热应力开裂问题并同时具有使样品均匀烧结成瓷的作用.现已成功地应用该保温体对CoMnNiO系NTC热敏材料;BaTiO3系PTC材料,ZnO掺杂系电压敏材料,LaCrO3基复合材料等氧化物电子陶瓷进行了微波烧结,烧结样品无热应力开裂并成瓷均匀致密.适用的氧化物电子陶瓷微波烧结温度区间最高可至1600℃.
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℃.
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