Al2O3/ZrO2层状复合陶瓷的研究
Al2O3/ZrO2 Laminated Ceramic Composites
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摘要: 用辊轧工艺,在最佳成分配比及烧结制度下,制备了Al2O3/20%Al2O3(nm)+20%ZrO2+60%Al2O3(μm)/Al2O3层状复合陶瓷.通过断裂韧性的测定,发现层状复合的断裂韧性值比无层状复合的Al2O3或ZrO2增韧Al2O3有很大的提高,利用扫描电镜(SEM)对层状复合的微观结构进行了观察,讨论了层状复合的增韧机制和ZrO2诱发微裂纹的机理,同时观察到层状复合断裂的典型特征为台阶状断裂。Abstract: The Al2O3/20%Al2O3(nm) + 20%ZrO2 + 60% Al2O3(μm)/Al2O3 laminated ceramic composites were fabricated by high-shear two-roll milling process. Its mechanical properties were measured and compared with Al2O3 and ZrO2 + Al2O3 non-laminated ceram-ics. The results showed that the toughness is great improved by means of laminated composite.The microcracks and tolerant of main crack propagation are the reasons to improved the toughness of laminated ceramic composites.
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