Effect of La₂O₃ content on wear resistance of alumina ceramics

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• 作者：Tingting WU ((吴婷婷))^a ; Jian ZHOU ((周 建))^a ; Bolin WU ((吴伯麟))^b ; ^{wubolin3211@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wenjie LI ((李文杰))^b
• 关键词：alumina ceramic ; abrasive media ; lanthanum oxide ; wear resistance ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：34
• 期：3
• 页码：288-294
• 全文大小：1599 K

文摘

In order to improve the wear resistance, a kind of alumina ceramic with good wear resistance was created in an Al₂O₃-CaCO₃-SiO₂-MgO-La₂O₃ (ACSML) system. The effects of La₂O₃ content on sintering temperature, bulk density, and wear rate were investigated. The wear rate of sample was as low as 0.0393‰. The wear resistance of the sample containing La₂O₃ has improved 43% than that of the sample without La₂O₃. Appropriate La₂O₃ doping could inhibit grain growth, enhance density, and purify grain boundary. La₂O₃ could diffuse into Al₂O₃ to form a solid solution and react with Al₂O₃ to form high-aluminum low-lanthanum complex oxides. The combination among Al₂O₃, the solid solution layer, and the layer of high-aluminum low-lanthanum complex oxides combined closely, which could improve grain boundary cohesion. Besides, the homogeneous distributions of elements made uniform structure. Finally, the wear resistance of alumina ceramic was improved.