氧化因素对ZrB_2-YAG复相陶瓷表面微区影响的研究

Effect of oxidizing factor on the surface microdomain of ZrB_2-YAG multi-phase ceramics

二硼化锆具有许多优异性能,因此它的应用非常广泛。本文研究氧化因素对ZrB2-YAG复相陶瓷的表面微区的影响,为改善超高温陶瓷奠定基础。结果表明:随着氧化温度升高,氧化层厚度增加。在1 300℃以下温度,氧化后陶瓷表面都有(m)ZrO2、YAG、B2O3和ZrB2,而1 300℃氧化后陶瓷表层中的ZrB2完全被氧化,不存在了。氧化层厚度随氧化时间的延长而增厚,但增厚的速率越来越小。

Zirconium diboride is widely used due to some excellent performances.Effect of oxidizing temperature on the surface microdomain of ZrB2-YAG multi-phase ceramics was studied,which aims to improve the performance of ultra-high-temperature ceramics.The results show that the oxidation layer thickness increases with the increasing of oxidation temperature.The ceramic surface shows the（m）ZrO2,YAG,B2 O3 and ZrB2 phases under the the oxidation temperature of 1 300 ℃,but the ceramic surface does not show the ZrB2 phase above the oxidation temperature of 1 300 ℃.That is to say that the ZrB2 phase of ceramic suface is entirely oxidized.The oxidation layer thickness increases with the increasing of the oxidation time.However,the increasing ratio of thickness is becomes smaller.