不同重力环境对AlN-玻璃复相陶瓷显微结构的影响

Effects of Different Gravity on the Microstructure of AlN-Glass Multiphase Ceramics

采用ＳＨＳ化学炉为热源，在抛物线飞行飞机上进行了一系列不同重力环境下的ＡｌＮ－玻璃复相材料的液相烧结，研究了烧结过程中，不同重力水平对材料显微结构和扩散行为的影响．研究结果表明：超重力条件下物相会发生偏析，而微重力条件下，物质扩散均匀，可促进晶粒的正常发育，有利于材料显微结构的均匀性．

A series of AlN-borosilicate glass multiphase ceramics were produced by using SHS chemical oven on the parabolic plane by which different gravity obtained. The influences of different gravity levels on material diffusion and its microstructure during liquid phase sintering were discussed. The results show that the different phase segregation can occur under elevated gravity conditions. On the contrary, the multiphase ceramics with uniform distribution of different phases and well growth of AlN grains can be obtained in microgravity. Therefore, microgravity proves good conditions to fabricate improved materials.