The influence of the molar ratio of Al2O3 to Y2O3 on sintering behavior and the mechanical properties of a SiC-Al2O3-Y2O3 ceramic composite

The influence of the molar ratio of Al2O3 to Y2O3 (i.e. MAl2O3/MY2O3) on sintering densification, microstructure and the mechanical properties of a SiC-Al2O3-Y2O3 ceramic composite were studied. It was shown that the optimal value of MAl2O3/MY2O3 was 3/2, not 5/3, which is customarily considered the...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-07, Vol.486 (1-2), p.262-266
Main Authors: ZHANG, N, RU, H. Q, CAI, Q. K, SUN, X. D
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Physics
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Summary:The influence of the molar ratio of Al2O3 to Y2O3 (i.e. MAl2O3/MY2O3) on sintering densification, microstructure and the mechanical properties of a SiC-Al2O3-Y2O3 ceramic composite were studied. It was shown that the optimal value of MAl2O3/MY2O3 was 3/2, not 5/3, which is customarily considered the optimal molar ratio for the formation of YAG (Y3Al5O12) phase. When MAl2O3/MY2O3 is 5/3, materials existed in two phases of YAG and very little YAM phases. The sintering mechanism of the solid phase occurred at 1850 deg C. When MAl2O3/MY2O3 was 3/2, materials existed in the two phases YAG (Y3Al5O12) and YAM (Y4Al2O9). The formation of the low melting point eutectic liquid phase (YAG + YAM) increased sintering densification. Flexure strength, hardness and relative density were all higher.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.09.052