【摘要】 以不同粒径的部分稳定ZrO₂（partially stabilized zirconia,PSZ）粉体为原料,采用共沉淀法包覆Al₂TiO₅纳米颗粒层,经高温烧结制备了高强度低膨胀的ZrO₂-Al₂TiO₅复相材料。研究了原料粒径、Al₂TiO₅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Al₂TiO₅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、Al₂TiO₅含量为5%（质量分数,下同）、ZrO₂f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。更多还原

【Abstract】 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 tem- perature.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 ap- parent 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 Al₂TiO₅ content. The ZrO₂-Al₂TiO₅ multiphase material sample containing 5%（mass fraction,the same below）Al₂TiO₅ with the ZrO₂ particle size of 0.8μm 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.更多还原