Influence of Coated Composite Powders on the Properties of ZrB2-YAG-Al2O3 Ceramics

被引：0

作者：

Song, Jieguang ^{[1
]}

Wang, Xiuqin

Wang, Fang ^{[1
]}

Li, Shibin ^{[1
]}

Ji, Gangchang ^{[1
]}

机构：

[1] Jiujiang Univ, Dept Mat Engn, Jiujiang 332005, Jiangxi, Peoples R China

来源：

HIGH-PERFORMANCE CERAMICS VIII | 2014年 / 602-603卷

关键词：

Ultra-high-temperature ceramics; ZrB2; Oxidation resistance; INFILTRATION;

D O I：

10.4028/www.scientific.net/KEM.602-603.451

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ZrB2, YAG and Al2O3 are widely applied because of some excellent performances, but ZrB2 is easily oxidized in the high-temperature air. To make the ZrB2 ceramics obtain better oxidation resistance, high-density ZrB2-YAG-Al2O3 ceramics were prepared. The influences of coated composite powders on the densification and the oxidation resistance of ZrB2-YAG-Al2O3 ceramics were investigated. The 80wt% ZrB2-YAG-Al2O3 multiphase ceramic materials from different composite raw materials with the spark plasma sintering technique were successfully prepared. The densification of ZrB2-YAG-Al2O3 ceramics with Al2O3-Y2O3 composite powder coated is easier than that of ZrB2-YAG-Al2O3 ceramics with YAG-Al2O3 powder mixed. The reaction temperature is lower than the 1100 degrees C for synthesizing YAG powders from Al2O3-Y2O3 composite powders. The weight gain are increased with increased the oxidation temperature. B2O3 is reacted with Al2O3 to form Al18B4O33, Al18B4O33 is melted and coated on the surface of ceramics to form a protective layer for the oxidation resistance of ceramics at high temperature. The oxidation weight gain of ZrB2-YAG-Al2O3 ceramic with Al2O3-Y2O3 composite powder coated is lower than that of ZrB2-YAG-Al2O3 ceramic with YAG-Al2O3 powder mixed.

引用

页码：451 / 456

页数：6

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