氧化物电子陶瓷微波烧结用保温材料MgAl2O4-LaCrO3的研究

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℃.

MgAl2O4-LaCrO3 Insulator Materials for the Microwave Sintering of Electronic Oxide Ceramics

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℃.