Mechanical Properties of Submicrometer-Grained Transparent Yttria Ceramics by Hot Pressing with Hot-Isostatic Pressing

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• 作者：Lin Gan ; Young-Jo Park ; Haneul Kim ; Jin-Myung Kim ; Jae-Woong Ko and Jae-Wook Lee
• 刊名：International Journal of Applied Ceramic Technology
• 出版年：2016
• 出版时间：July/August 2016
• 年：2016
• 卷：13
• 期：4
• 页码：678-684
• 全文大小：1606K
• ISSN：1744-7402

文摘

Here, we report the fabrication and mechanical properties of submicrometer-grained (0.29–0.58 μm) transparent yttria ceramics by hot pressing combined with hot-isostatic pressing. The effects of the grain size on the microhardness and the fracture toughness were studied. An unusual decrease of the fracture toughness with an increase in the grain size was revealed, which may be attributed to the different grain size dependence of the fracture behavior of the ZrO₂-doped yttria ceramics compared to that of other yttria ceramics. The microhardness and fracture toughness of the transparent yttria ceramics were found to be better than those of the large-grained yttria ceramics.