稀土强化Al_2O_3/Ti(C,N)陶瓷材料的热震与高温氧化行为研究

Thermal Shock and High Temperature Oxidation Behaviors of Rare Earth Strengthened Al_2O_3/Ti(C,N) Ceramic Materials

以稀土强化Al2O3/30vol%Ti(C,N)/0.5vol%Y2O3陶瓷材料为基础,进行了材料的热震与高温氧化行为研究,并采用SEM、XRD进行微观结构特征和物相分析。结果发现,该材料具有良好的抗热震性能与抗氧化性能。微观结构观察发现,热震损伤的主要形态是晶粒脱落、不同形状纵横交错的微观与宏观裂纹。约在900℃时材料开始发生轻微氧化,速度较慢,而在1200℃时氧化加剧。所形成的氧化产物TiO2,可以在材料表面形成氧化膜,阻止材料进一步的氧化。

Based on the rare earth reinforced Al2O3/30vol% Ti （ C, N）/0.5vol% Y2O3 ceramic material, thermal shock and high temperature oxidation behaviors have been carried out. SEM and XRD are used to perform the microstructural characterization and phase analysis of the material, Results show that the developed ceramic material has good thermal shock resistance and high temperature oxidation resistance. It indicates from the microstructural observation that thermal damage forms mainly include the peeling off of grains, micro and macro crisscross cracks of different shapes. The material begins to be oxidized slightly nearly from 900℃ with low oxidation speed. The oxidation is intensified at 1200℃. The oxidation product is TiO2 which can prevent further oxidation of the material through the formation of oxidation layer in the surface of the ceramic material.