为了研究3Y-TZP为基体的3Y-TZP/mullite-Alumina复合陶瓷的断裂韧性及其增韧机制,将3Y-TZP、mullite、Alumina 3种粉料球磨混合,经干压、等静压成型,在1 480℃,4 h无压烧结,通过改变Alumina/mullite体积比,得到了不同断裂韧性的陶瓷复合材料,利用XRD与SEM技术分析了复合材料的成分及微观结构.研究结果表明:Al2O3/mullite体积比影响复合材料中四方氧化锆(t-ZrO2)向单斜氧化锆(m-ZrO2)转变的相变量、复合材料的微观结构和t-ZrO2晶面间距,进而影响材料的断裂韧性;用单边切口梁法测试复合材料断裂韧性(KIC)为9.26～10.4 MPa·m1/2;此系统中存在ZrO2相变增韧、非相变第二相颗粒增韧等机制.
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