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Indexed by:期刊论文

Date of Publication:2017-02-01

Journal:CERAMICS INTERNATIONAL

Included Journals:SCIE、EI

Volume:43

Issue:2

Page Number:1781-1787

ISSN No.:0272-8842

Key Words:Microstructure-final; Mechanical properties; Al2O3; Structural applications

Abstract: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 degrees 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 degrees C, which is much higher than that of the sintered ceramic with the same composition. However, its plastic deformability is insufficient, even at 1700 degrees C (just below the melting point of 1715 degrees C), and cracking occurs during compressive deformation.