Ti3SiC2氧化膜的抗循环氧化行为
刘光明 李美栓 周延春 张亚明
(中围科学院金属研究所沈阳材料科学国家(联合)实验室)
摘 要 用循环氧化和用声发射技术研究了Ti3SiC2陶瓷材料氧化膜的抗剥落性和氧化膜的开裂行为利用XRD和SEM分析了表面成分和结构。结果表明， Ti3SiC2有良好的抗循环氧化性能腐蚀产物分成明显的两层，外层成分为TiO2．内层为TiO2和SiO2的混合物内层有明显的贯穿性纵向裂纹。在声发射实验的恒温阶段没有观测到声信号，但在降温过程中出现了声信号，表明生产应力不会导致氧化膜破裂，而热应力导致氧化膜破裂。
关键词 钛碳化硅 循卧氧化 声发射
分类号TB 304 文章编号 1005-3093(2002)03-0263-05
THE CYCLIC OXIDATION BEHAVIOR OF Ti3SiC2-BASED CERAMIC
LIU Guangming LI Meishuan ZHOU Yanchun ZHANG Yaming
(State Key Laboratory for Corrosion and Protection of Metals, Instilute of Metal Research,
Chinese Academy of Sciences, Shengyang 110016)
Manuscript received July 5, 2001; in revised form Oct 11, 2001
To whom correspondence should be addressed，Tel: (024)23915913,
Emial; gmliu@imr.ac.cn
ABSTRACT The spalling resistance and cracking behavior of oxide film on Ti3SiC2 have been stud-ied by cyclic oxidation and acoustic emission test. The morphology, microstructures and composition of the oxide scales are examined by SEM/EDS and XRD. It is shown that Ti3SiC2 exhibits good cyclic oxidation resistance at 1100℃ after 360 cycles. The oxide scale layer is stratified which is consistedof an outer part and inner part. The outer and inner part is consisted of TiO2and a mixture of TiO2and SiO2 respectively, which are the same as isothermal oxidation. It is important that there are many cracks in the inner layer can be observed. It is shown that the growth stress would not cause crack inoxide scale, however, thermal stress would cause inner oxide film crack by acoustic emission test.
KEY WORDS titanium silicon carbide ceramic, cyclic oxidation, acoustic emission
Ti3SiC2层状三元化合物综合了陶瓷和金属的优点，具有高强度、高模量、低密度、可加工等优点，是一种很有发展前景的高温结构材料[1]。研究表明，在一定的温度范围该材料有较好的抗高温氧化性能[2-5]。过去的工作主要研究了材料的恒温氧化性能，本文研究在Ti3SiC2上形成的氧化膜的抗剥落性能。
