The effect of the oxidation conditions on the surface microdomains of ZrB2-YAG ultra-high temperature ceramics

• Published in: Journal of Ceramic Processing Research, 14(4) pp. 535 - 537
• Main Authors: Jie-Guang Song, Min-Han Xu, Da-Ming Du, Fang Wang, Shi-Bin Li, Gang-Chang Ji
• Format: Journal Article
• Language: English
• Published: 세라믹연구소 01.08.2013
• Subjects: 재료공학
• ISSN: 1229-9162; 2672-152X

Zirconium diboride is widely applied because of some excellent properties. The effect of the oxidation temperature on the surface microdomain of ZrB2-YAG multi-phase ceramics was studied, it helps to improve the performance of ultra-hightemperature ceramics. The results show the oxidation layer thickness is increased with an increase in the oxidation temperature, the oxidation layer thickness is decreased by increasing the density of multi-phase ceramics at the same oxidation temperature. The ceramic surface shows the (m)ZrO2, YAG, B2O3 and ZrB2 phases below the the oxidation temperature at 1300 ο C, but the ceramic surface do not show the ZrB2 phase above the oxidation temperature at 1300 ο C that is to say, the ZrB2 phase of the ceramic suface is entirely oxidized. The oxidation layer thickness is increased with an increase in the oxidation time, however, the ratio of increasing thickness is less and less. The oxidation layer shows a loose structure during the initial stage of the oxidation, which lacks a barriers for the diffusion of the oxygen. KCI Citation Count: 0