Al2O3/ZrO2 Laminated Ceramic Composites
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摘要: 用輥軋工藝,在最佳成分配比及燒結制度下,制備了Al2O3/20%Al2O3(nm)+20%ZrO2+60%Al2O3(μm)/Al2O3層狀復合陶瓷.通過斷裂韌性的測定,發現層狀復合的斷裂韌性值比無層狀復合的Al2O3或ZrO2增韌Al2O3有很大的提高,利用掃描電鏡(SEM)對層狀復合的微觀結構進行了觀察,討論了層狀復合的增韌機制和ZrO2誘發微裂紋的機理,同時觀察到層狀復合斷裂的典型特征為臺階狀斷裂。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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Key words:
- alumina /
- zirconia /
- laminated ceramic composites /
- fracture toughness
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