High temperature deformation of non-directionally solidified Al₂O₃/YAG/ZrO₂ eutectic bulk ceramic

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• 作者：Xue-song Fu^a ; Lian-sheng Fu^a ; Guo-qing Chen^a ; ^{gqchen@dlut.edu.cn} ; Wen-bo Han^b ; Wen-long Zhou^a
• 关键词：B Microstructure-final ; C Mechanical properties ; D Al2O3 ; E Structural applications
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：1781-1787
• 全文大小：3026 K
• 卷排序：43

文摘

Excellent high temperature mechanical properties of melt-grown Al2O3-based eutectics have previously been demonstrated in samples prepared by directional solidification methods. In this study, the deformation behaviour of melt-grown Al2O3/YAG/ZrO2 eutectic bulk prepared by a non-directional solidification method was investigated by means of compressive tests in a temperature range of 1200–1700 °C. The non-directionally solidified eutectic bulk ceramic has a colony structure and is polycrystalline. It begins to show ductility and has a compressive strength of 320 MPa at 1500 °C, which is much higher than that of the sintered ceramic with the same composition. However, its plastic deformability is insufficient, even at 1700 °C (just below the melting point of 1715 °C), and cracking occurs during compressive deformation.