含尖晶石空心球的刚玉-尖晶石材料制备及性能

采用电熔-喷吹法制备了镁铝尖晶石空心球,结合空心球结构与性质特征,将其引入刚玉-尖晶石材料,对比研究了不同粒径空心球对材料显微结构、力学强度及隔热能力的影响.结果 表明:制备的空心球球形度高,球壁由单层或多层镁铝尖晶石晶粒镶嵌结合而成,球体的抗压能力取决于球壁厚度及其均匀性.降低粒径、引入复合粒径空心球,通过球体之间的...

Preparation and properties of corundum-spinel materials containing spinel bubbles

Magnesium aluminate spinel bubbles were prepared by electrofusion injection process. And the effects of various bubbles with different particle sizes on the microstructure, mechanical strength and thermal insulation capacity of corundum spinel materials were studied systematically. The results show that the prepared bubbles possessed high sphericity, and the bubble wall is composed of single layer or multi layer magnesium aluminate spinel grains. The compressive resistance of bubble depends on the thickness of wall and its uniformity. The decrease in particle size and introduction of bubbles with different sizes leads to the lowered pore size and enhanced mechanical strength of materials from the packing effects of bubbles. Controlling the introduction of bubbles with different sizes to reduce the point contact between bubbles is conducive to the enhancement of thermal insulation capacity of materials.