Abstract The excellent wear resistance of grinding medium is the key to obtain high purity ultra-fine powders and prepare high-performance ceramics. The purpose of this work is to reveal mechanisms that rare earth oxides improve or reduce the wear resistance of alumina ceramic in the Al2O3-RE2O3–SiO2–CaO–MgO systems. The relationship between the wear rate and bulk density, phase composition, microstructure, thermal expansion behavior of the crystal phase and glass phase is discussed. The results show that a trace amount of Yb2O3 can improve wear resistance of the alumina ceramic, but the effect of Tm2O3 is the opposite. The influence of rare earth on the thermal expansion behavior of the phases is essential for the grain refinement and wear resistance of alumina ceramics.

中文翻译：

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Yb2O3和Tm2O3对高铝陶瓷耐磨性的影响

摘要 研磨介质优异的耐磨性是获得高纯度超细粉体和制备高性能陶瓷的关键。这项工作的目的是揭示稀土氧化物在 Al2O3-RE2O3-SiO2-CaO-MgO 体系中提高或降低氧化铝陶瓷耐磨性的机制。讨论了磨损率与体积密度、相组成、微观结构、晶相和玻璃相的热膨胀行为之间的关系。结果表明，微量的Yb2O3可以提高氧化铝陶瓷的耐磨性，而Tm2O3的作用则相反。稀土对相热膨胀行为的影响对于氧化铝陶瓷的晶粒细化和耐磨性至关重要。