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 on sintering behavior and the mechanical properties of a SiC–Al2O3–Y2O3 ceramic composite
复制标题
DOI：
10.1016/j.msea.2007.09.052
复制
发表时间：
2008-07
期刊：
影响因子：
6.4
通讯作者：
Ning Zhang;H. Ru;Q. Cai;X. D. Sun
中科院分区：
文献类型：
--
作者：
Ning Zhang;H. Ru;Q. Cai;X. D. Sun
研究了Al2O3与Y2O3的摩尔比（即[式：见正文]）对SiC-Al2O3-Y2O3陶瓷复合材料的烧结致密化、微观结构和力学性能的影响。结果表明，[式：见正文]的最佳值为3/2，而不是通常认为形成YAG（Y3Al5O12）相的最佳摩尔比5/3。当[式：见正文]为5/3时，材料中存在YAG两相和很少的YAM相。固相的烧结机制发生在1850℃。当[分子式：见正文]为3/2时，材料以YAG（Y3Al5O12）和YAM（Y4Al2O9）两相存在。低熔点共晶液相（YAG+YAM）的形成增加了烧结致密化。弯曲强度、硬度和相对密度均较高。
The influence of the molar ratio of Al2O3to Y2O3(i.e. [Formula: see text] ) on sintering densification, microstructure and the mechanical properties of a SiC–Al2O3–Y2O3ceramic composite were studied. It was shown that the optimal value of [Formula: see text] was 3/2, not 5/3, which is customarily considered the optimal molar ratio for the formation of YAG (Y3Al5O12) phase. When [Formula: see text] 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°C. When [Formula: see text] 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.