氧化铝-莫来石陶瓷的抗热震性研究

Research on the Thermal Shock Resistance of Alumina-Mullite Ceramic Composites

近年来,人们利用ZrO2的马氏体相变增韧机理来降低Al2O3瓷的脆性,使抗热震临界温差ΔT由200～220℃提高到了280℃,并在磁流体发电试验研究中被用作高温结构陶瓷。文[2]认为通过热膨胀失配、颗粒弥散、纤维增强、引入第二相降低热膨胀系数等途径也可达到增韧的目的。作者在改性氧化铝的基础上加入石英玻璃,用热压注法成型并烧结成陶瓷试样,研究了氧化铝-莫来石陶瓷的抗热震性能.

The resistance to thermal shock and relative properties of the alumina-zirconia-mullite composites are analyzed. The composites were made by adding quartz glass into the base of improved alumina ceramics and sintered by the method of hot pressing injection. The test results show that the mullite is synthesized from quartz glass and alumina during the sintering process, the coefficient of expansion and the Young's modulus of the composites decrease with the add of quartz, while the resistance to thermal shock increases obviously.