在1650～1700℃下制备了Si-Al-Zr-O(SAZ)溶胶,经快速冷却获得均匀致密的SAZ系非晶体,经梯度热处理得到SAZ系超微细晶复相陶瓷.结合示差扫描量热分析(DSC)、红外光谱(IR)、X射线衍射(XRD)和扫描电镜(SEM)等技术以及Vicker压痕法,研究了相关超微细晶复相陶瓷结构和性能随热处理温度的变化.结果表明,SAZ系非晶体在950℃时开始析出四方氧化锆,1100℃时晶化基本完成,主晶相为莫来石和四方氧化锆,晶粒尺寸为10～40nm;温度升高至1200℃,晶粒迅速长大至0.5μm左右,部分四方氧化锆向单斜氧化锆的转变.样品的显微硬度和断裂韧性经1150℃热处理后均达到最大,分别为12.6GPa和4.32MPa·m1/2.
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