钛酸铝含量对Al_2O_3-Al_2TiO_5复合材料性能的影响  

Influence of aluminum titanate content on performance of Al_2O_3-Al_2TiO_5 composite

作　　者：王志发[1] 马淑龙[1] 张利芳[1] 卜景龙[1] 

机构地区：[1]河北理工大学材料学院,唐山063009

出　　处：《耐火材料》2008年第5期375-378,共4页Refractories

基　　金：国家自然科学基金资助项目(50572023)

摘　　要：以预合成钛酸铝和煅烧氧化铝为原料,按不同比例混合,湿法共磨至粒径〈10μm,干燥后加入PVA溶液结合剂混合,经100 MPa成型后,在1 500℃3 h下烧成,制备出Al2O3-Al2TiO5复相陶瓷材料,并研究了钛酸铝含量对烧后试样显微结构与性能的影响。结果表明：（1）随着复相材料中钛酸铝含量的增加,试样的烧后线变化率、抗折强度与线膨胀率逐渐降低;（2）钛酸铝含量为50%的试样显微结构较为致密,抗折强度为25.2 MPa,室温-1 100℃的平均线膨胀系数仅为3.6×10^-6℃^-1;（3）其优良的抗热震性能归因于其低热膨胀及晶界应力的共同作用,该复相材料适于用作高温作业领域的抗热震耐火材料。The Al2O3-Al2TiO5 ceramic material was prepared using synthesized aluminum titanate and calcined alumina as starting materials, mixing according to various proportions, and wet milling till particle size 〈10 μm, adding PVA solution binder after drying, shaping under 100 MPa, then firing at 1500 ℃ for 3 h. The influence of aluminum titanate content on microstructure and performance of fired specimen was studied. The results showed that： （1） The linear change, modulus of rupture and linear expansion rate decreased gradually as the aluminum titanate content increasing; （2） The specimen with 50% aluminum titanate had dense microstructure, and the modulus of rupture was 25.2 MPa, the average linear expansion coefficient from room temperature to 1 100 ℃ was 3.6× 10^-6 ℃^-1; （3） Its excellent thermal shock resistance can be contributed to the low thermal expansion and the multiphase interface stress. So it is suitable for application in high temperature filed as refractories with high thermal shock resistance.

关 键 词：煅烧氧化铝 钛酸铝 显微结构 抗热震性 

分 类 号：TQ326.5[化学工程—合成树脂塑料工业] TQ174.758