Al2O3/ZrO2层状复合陶瓷的研究

Al₂O₃/ZrO₂层状复合陶瓷的研究

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.