Fabrication of Y3Al5O12-Al2O3 eutectic materials having ultra fine microstructure
Fabrication of Y3Al5O12-Al2O3 eutectic materials having ultra fine microstructure
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DOI：
10.1016/j.jeurceramsoc.2007.05.014
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发表时间：
2008
影响因子：
5.7
通讯作者：
Y. Harada;N. Uekawa;T. Kojima;K. Kakegawa
中科院分区：
文献类型：
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作者：
Y. Harada;N. Uekawa;T. Kojima;K. Kakegawa
具有共晶成分的Y2 O3和Al 2 O3混合物被熔化并迅速淬火以形成非晶相。研究了由非晶相形成的共晶显微组织。非晶相在1000°C和1300°C下热处理30 min形成Y3 Al 5 O 12（YAG：钇铝石榴石）-Al 2 O3共晶组织。非晶相在1300 ℃保温30 min后形成的共晶组织为超细晶组织。采用常规烧结和放电等离子烧结（SPS）两种方法对非晶薄膜进行粉碎和烧结。常规烧结后，常规烧结试样的共晶组织变得粗糙。采用传统的烧结方法，需要较高的烧结温度（1600°C）和较长的烧结时间（24 h）才能形成致密的试样。这导致了晶粒生长。相反，SPS烧结体具有高体积密度的超细共晶显微组织。SPS在抑制晶粒生长方面是成功的。
A mixture of Y2O3and Al2O3with a eutectic composition was melted and quenched rapidly to form an amorphous phase. A eutectic microstructure, which was formed from the amorphous phase, was investigated. A heat-treatment of the amorphous phase at 1000°C and 1300°C for 30min formed an Y3Al5O12(YAG: Yttrium Aluminium Garnet)-Al2O3eutectic microstructure. The eutectic microstructure, which was formed from the amorphous phase at 1300°C for 30min, was ultra fine. The amorphous film was pulverized and sintered both by conventional sintering and Spark Plasma Sintering (SPS). Following conventional sintering the eutectic microstructures of the conventionally sintered specimens became coarse. By using the conventional sintering method, a high sintering temperature (1600°C) and long sintering time (24h) was required to form dense specimens. This resulted in grain growth. On the contrary, the SPS sintered body had an ultra fine eutectic microstructure with a high bulk density. SPS was successful in suppressing grain growth.