摘要
研究以Al_(2)O_(3)、TiO_(2)及石英为主要原料,采用固相反应法原位制备了兼具良好机械性能及抗热震性能的钛酸铝-莫来石复相耐热陶瓷。采用XRD、SEM等测试方法研究了样品的物相组成及显微结构。研究表明:在烧成温度大于1400℃保温2h,可以成功合成出Al_(2)TiO5/莫来石复相陶瓷材料。随着烧成温度的升高,样品的吸水率、气孔率逐步降低,并在1470℃时达到最低值,而样品的弯曲强度持续增大,在1500℃时达到最大值199.48MPa。试样经1000℃~室温热震循环20次后,无开裂,其中在1450℃下烧结得到的样品抗热震性能最佳,其弯曲强度达109.94 MPa,60次热震后强度增加至153.23MPa,强度保持率达139.38%。
Aluminum titanate-mullite multiphase ceramics,having good mechanical properties and thermal shock resistance,were prepared by in-situ sintering using Al_(2)O_(3),TiO_(2),and quartz as main raw materials.The phase composition and microstructure of the samples were studied by XRD and SEM.The experimental results show that aluminum titanate-mullite multiphase ceramics could be successfully synthesized when the sintering temperature is greater than 1400℃for 2 hours.The water absorption and porosity of the samples decrease with the increase of sintering temperature,and reach the lowest point at 1470℃,while their bending strengths continue to increase,reaching the maximum value of 199.48 MPa at 1500℃.No cracking occurred in the samples surface after 20 cycles of thermal shock at 1000℃~room temperature(RT).The sample sintered at 1450℃shows the best thermal shock resistance,giving a bending strength of 109.94 MPa and 153.23 MPa,respectively,after 60 thermal shocks cycles between 1000℃~RT in air,and the strength retention rate reaches 139.38%.
作者
林锋晟
张宏泉
文进
彭志永
LIN Feng-sheng;ZHANG Hong-quan;WEN Jin;PENG Zhi-yong(School of Materials Science and Engineering,WuhanUniversityofTechnology,Wuhan430070,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
2021年第8期1-5,共5页
Journal of Wuhan University of Technology
基金
揭阳市科技创新发展专项资金(2019068).
关键词
耐热陶瓷
钛酸铝
莫来石
抗热震性
烧结温度
heat resistant ceramics
aluminum titanate
mullite
thermal shock resistance
sintering temperature
