稀土氧化物La2O3/Y2O3增韧补强ZTA陶瓷材料及其耐磨性能研究

材料导报, 2016, 30(12): 14-17. doi: 10.11896/j.issn.1005-023X.2016.12.004

稀土氧化物La2O3/Y2O3增韧补强ZTA陶瓷材料及其耐磨性能研究

周后明 ^1, , 曾国章 ^2, , 刘景文 ^3, , 张高峰 ^4, , 周友行 ^5,

1.湘潭大学机械工程学院,湘潭,411105

2.湘潭大学机械工程学院,湘潭,411105

3.湘潭大学机械工程学院,湘潭,411105

4.湘潭大学机械工程学院,湘潭,411105

5.湘潭大学机械工程学院,湘潭,411105

基金项目: 湖南省高校创新平台开放基金项目(13K040) 国家自然科学基金(51375418,51375419,51275436)

关键词：稀土氧化物 , 氧化镧 , 氧化钇 , 氧化锆增韧氧化铝(ZTA)陶瓷 , 增韧补强 , 摩擦磨损

Rare Earth Oxides La2O3/Y2O3-toughened & Reinforced ZTA Ceramic and Its Abrasion Resistance

Keywords： rare earth oxide , lanthanum(Ⅲ) oxide , yttrium(Ⅲ) oxide , zirconia-toughened alumina (ZTA) ceramic , toughening and reinforcing , friction and wear

针对单一相ZrO2增韧Al2O3 (ZTA)陶瓷在提高韧性的同时不能合理兼顾其耐磨性能,利用稀土氧化物能促进复合陶瓷材料热压烧结的工艺特点,将La2O3/Y2O3添加到ZTA陶瓷材料中,XRD衍射图谱表明:La2 O3/Y2O3的添加可以有效阻碍ZrO2不稳态晶型相变,促进介稳态t-ZrO2的形成.当添加量为4％(质量分数)时,烧结后晶粒分布最为均匀,致密程度高,其维氏硬度、抗弯强度、断裂韧性分别比相应未添加稀土氧化物的ZTA材料提高了8％、21％、33％,且La2O3与Al2O3会发生原位反应生成片状LaAl11O18,这种片晶不仅可以阻碍Al2O3、ZrO2颗粒长大,还可通过晶粒拔出等增韧机制提高材料韧性.摩擦磨损试验结果表明:稀土氧化物的添加能提高ZTA陶瓷材料的耐磨性能,添加量为4％时其磨损率最低.

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