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氧化鋁陶瓷和氧化鋯陶瓷都有很多種。天然氧化鋁是剛玉，莫式硬度為9 ，立方氧化鋯的莫式硬度為8.5 。因此純氧化鋁和氧化鋯來說氧化鋁的硬度更高，也更耐磨。但是氧化鋁陶瓷是混合體，它人工經過配料然后燒結而成的，并非純脆的剛玉。因此要看陶瓷的氧化鋁含量，有的廠家有95%氧化鋁陶瓷，97%氧化鋁陶瓷，99%氧化鋁,99.7%氧化鋁陶瓷等多種陶瓷。而氧化鋯陶瓷硬度也非常高。
如果在離心作用力下工作的研磨介質材料好選用氧化鋯，其單斜晶型密度為5.85。而氧化鋁的密度只有3.9-4.0。因此選氧化鋯做研磨介質會產生更大的剪切力，提高研磨效率。 如果做為研磨罐，或軸承等部件的材料，則選擇硬度更高的高純氧化鋁陶瓷效果會更好。（圖/文hytlfdc.com）
中譯英：
 Alumina ceramic and zirconia ceramic has many kinds. Natural alumina corundum, Mohs hardness of 9, cubic zirconia mullite hardness is 8.5. Thus pure alumina and zirconia, alumina higher hardness, is more resistant to. But is it a mixture of alumina ceramics, artificial after dosing and then sintered, not pure corundum. So to see ceramic alumina content, some manufacturers have 95% alumina ceramic,97% alumina ceramics,99% alumina,99.7% alumina ceramics and other ceramic. The zirconia ceramic hardness is very high.

If the centrifugal force of the grinding medium material work under the best selection of zirconium oxide, its monoclinic density of 5.85. While alumina density only 3.9-4.0. So choosing zirconia do grinding medium will produce greater shear stress, to improve the grinding efficiency. If as a grinding tank, or bearing and other parts of the material, choosing higher hardness of high purity alumina ceramic, the effect will be better.