添加剂对钛酸铝陶瓷性能的影响

摘要

The influence of some additives on bulk density,phase composition,mechanical strength and thermal shock resistance of aluminium titanate (AT) ceramics was investigated.AT ceramics with different additives of MgO,SiO2 and Fe2O3 were prepared by reaction sintering.Properties of AT ceramics were tested by using Archimedes,three-point bending and thermal cycling tests.It was found that additives of MgO,SiO2 and Fe2O3 or their compound additives are favorable to reduce the porosities of AT,enhance mechanical strength and thermal shock resistance.The role of additives can be rationalized in terms of promotion of sintering process,formation of new phases and influence on lattice constant c of AT ceramics.%研究了添加剂对钛酸铝陶瓷的体积密度、物相组成、机械强度以及抗热震性的影响.用反应烧结法制备钛酸铝陶瓷,其中添加剂为MgO、SiO2、Fe2O3及其复合添加剂.通过阿基米德排水法测试陶瓷的体积密度及气孔率,采用三点弯曲方法测试陶瓷强度,并利用热循环实验测定陶瓷抗热震性.结果表明:MgO、SiO2、Fe2O3及其复合添加剂有利于减少气孔率,提高钛酸铝陶瓷强度,增强陶瓷抗热震性.添加剂能促进烧结,形成新相,并且可以提高钛酸铝的晶格常数c.