ZrO2-Al2TiO5复相材料的抗热冲击性能  

THERMAL SHOCK RESISTANCE OF ZrO_2-Al_2TiO_5 MULTIPHASE MATERIALS

作　　者：朱宝利[1] 马淑龙[2] 卜景龙[2] 王志发[2] 孙加林[1] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]河北理工大学材料学院,河北唐山063009

出　　处：《硅酸盐学报》2008年第2期228-232,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50572023)资助项目。

摘　　要：以不同粒径的部分稳定ZrO_2(partially stabilized zirconia,PSZ)粉体为原料,采用共沉淀法包覆Al_2TiO_5纳米颗粒层,经高温烧结制备了高强度低膨胀的ZrO_2-Al_2TiO_5复相材料。研究了原料粒径、Al_2TiO_5含量、烧成温度对复相材料的烧结性能、相组成、显微结构以及抗热冲击性能的影响。结果表明:随烧成温度的提高,PSZ各粒径样品的显气孔率呈逐步减小的规律,抗折强度呈逐步增大的趋势。随样品中纳米Al_2TiO_5含量的增加,单斜氧化锆到四方氧化锆的相交温度不断降低。在1500℃烧结的、Al_2TiO_5含量为5%(质量分数,下同)、ZrO_2f平均粒径为0.8μm)的样品,其显气孔率最小,为6.29%;抗折强度最大,为53.14MPa;室温到1 100℃急冷急热冲击20次后,样品仍保持完整,仅在表面出现轻微剥落,抗热震性能明显高于其他样品。ZrO2-Al2TiO5 multiphase materials with high strength and low expansion were prepared by partially stabilized zirconia （PSZ） powder with different particle sizes coated with nanosized Al2TiO5 by co-precipitation method and then sintered at high temperature. The effects of raw material size, Al2TiO5 content and sintering temperature on the sintering properties, phase composition, microstructure and thermal shock resistance of multiphase materials were investigated. The experimental results show that the apparent porosity decreases and the bending strength increases for samples with different PSZ sizes with the increase of the sintering temperature. The phase transformation temperature of m-ZrO2→t-ZrO2 decreases with the increase of the nanosized A12TiO5 content. The ZrO2-Al2TiO5 multiphase material sample containing 5% （mass fraction, the same below） Al2TiO5 with the ZrO2 particle size of 0.8 μm sintered at 1500℃ has the lowest apparent porosity （6.29%） and the highest bending strength （53.14 MPa）. This sample was kept complete and only slight spalling occurred on the surface after thermal shock of twenty times from room temperature to 1 100℃. The thermal shock resistance of the sample is better than that of other samples.

关 键 词：氧化锆 钛酸铝 共沉淀法 复相材料 热冲击性 

分 类 号：TQ175.75[化学工程—硅酸盐工业]