摘要
以氧氯化锆((ZrOCl2·8H2O)、硫酸铝(Al2(SO4)3·18H2O)、硫酸氧钛(TiOSO4·2H2O)为初始原料,以氨水为沉淀剂,将液相共沉淀法得到的Al2TiO5/ZrO2纳米复合粉体前驱体,经1000℃焙烧2h,制备了ZrO2含量(w)为2%、5%、8%的Al2TiO5/ZrO2纳米复合粉体;复合粉体经造粒后以100Mpa压力成型试样,试样尺寸为53mm×10mm×10mm,经1350、1400、1450、1500℃2h制备了Al2TiO5/ZrO2(缩写AT/Z)纳米复相陶瓷试样。研究了ZrO2含量、烧结温度对试样的烧结性能、热膨胀性能、抗热震性能的影响,并借助XRD、SEM分析了试样的物相组成、显微结构。结果表明:随着ZrO2含量的增加和烧结温度的提高,试样的显气孔率减小,抗弯强度增大。烧结温度为1500℃、ZrO2含量(w)为5%的ATZ-54试样,抗弯强度最大,为103.2MPa;在1250℃的热膨胀率仅为0.08%,其热膨胀系数α约为0.65×10-6℃-1;AT/Z纳米复相陶瓷试样具有细晶镶嵌结构;从室温到1100℃急冷急热冲击31次后,试样表面仍保持完整,抗热震性能明显高于其他试样。
Nano sized Aluminium titanate/zirconia composite powders precursors were obtained by coprecipitation process, using zirconium oxychloride, aluminum sulfate, titanium oxysulfate as starting materials, aqueous ammonia as precipitating agent. The precursors were sintered at 1000E for 2h, Al2TiO5ZrO2 nanocomposite powders in which ZrO2 content （w） was 2%, 5%, 8% were produced. The composite powders samples by powder pelletizing process were pressed into 53mm× 10min× 10mm bars at 100 Mpa. The AlzTiOS ZrO2 （short for AT/Z） nanocomposite ceramic specimens were prepared at 1350, 1400, 1450, 1500℃ for 2h. The effect of ZrO2 content and sintering temperature on the sintering properties, thermal expansion, thermal shock resistance of specimens was studied, the phase compositions and fine texture of samples were analysed by XRD, SEM and so on. The experimental results show that： With the increase of ZrO2 content and sintering temperature, apparent porosity decreased, but the bending strength increased of samples. The ATZ-54 sample with 5% （w） ZrO2 content sintered at 1500℃ has the highest bending strength of 103.2MPa, and its thermal expansion rate is 0.08% at 1250℃, the thermal expansion cofficent a is about 0.65×10^-6/℃. The AT/Z nanocomposite ceramics sample has fine grains microstrcture the sample kept complete after 31 times thermal shock experiment from room temperature to l 100℃. Thermal shock resistance of the sample is apparently better than that of others.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2008年第12期36-40,共5页
China Ceramics
基金
国家自然科学基金委员会资助项目,编号:50572023
关键词
钛酸铝
氧化锆
共沉淀法
抗热震性能
纳米复相陶瓷
aluminium titanate, zirconia, co-precipitation method, thermal shock resistance,nanocomposite ceramics
