采用非晶原位晶化法从Si-Al-Zr-O(SAZ)系非晶中制备ZrO2-mullite纳米复相陶瓷.用XRD、IR和SEM技术对前驱体非晶以及晶化后试样进行表征,并着重研究热处理温度对ZrO2-mullite纳米复相陶瓷结构与力学性能的影响.结果表明,前驱体SAZ非晶经960℃热处理开始析出t-ZrO2晶体,1000℃时莫来石晶相形成.试样经低温950～1000℃和高温1100～1250℃梯度热处理后,t-ZrO2、mullite成为主晶相,同时生成c-SiO2.其中低温阶段的核化温度对陶瓷试样的显微结构和断裂韧性产生重大影响.当核化温度由950升至1000℃时,纳米颗粒明显增大,断裂韧性急剧下降;而高温阶段的晶化温度对力学性能影响相对较小.随着晶化温度的升高,试样的断裂韧性和抗弯强度均先略有增加随后下降.试样经950℃核化、1150℃晶化后取得最佳力学性能:断裂韧性5.13 MPa·m1/2和抗弯强度521 MPa.
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