中文摘要：

通过氧化增重实验、X射线衍射（xRD）、扫描电镜（SEM）和能谱分析（EDS）对Ti2AlC/Al2O3复合材料在1100～1；500℃的循环氧化行为进行了研究。结果表明：当温度低于1200℃时，Ti2AIC／Al2O3复合材料的氧化行为符合抛物线规律，且随着温度从1100℃升高至1200℃，抛物线速率常数相应的从1．715×10^-8增加至7．597×10^-8kg2m-4s-1Ti2AlC/Al2O3复合材料良好的抗氧化性归功于试样表面形成致密的TiO2和Al2O5保护层。而该材料1300℃的氧化产物主要由α-Al2O3内层、TiO2和他TiO5的混合物外层组成，由于Tic杂质相的存在以及TiO2和Al2O3反应生成Al3TiO5使Tl2Alc材料在1600℃时的抗氧化性能有所降低。

英文摘要：

The cyclic oxidation behavior of Ti2A1C/A1203 composites have been investigated at 1100- 1300℃ in air for exposure times up to 30 cycles by means of X-ray diffraction （XRD） and scanning electron microscopy （SEM）. It has been demonstrated that Ti2A1C/A1203 composites possess excellent oxidation resistance bellow 1200℃ . The oxidation of Ti2AIC/A1203 composites generally follows a parabolic rate law, in which the parabolic rate constants （kp） increase from 1.715x10-＂ to 7.597x10-s kg2m-4s-1 as the temperature increases from 1100 to 1200 ~C . The oxidation scales formed below 1200 V are dense, adherent and resistant to cyclic oxidation. However, for the samples oxidized at 1300℃ , the scales consist of an inner layer of α-Al2O3 and an outer layer of a mixture of A12TiO5 and TiO2. The unexcellent resistance to thermal cycling of Ti2A1C/AlO3 composites at 1300 ℃ is attributed to the impurity of TiC and the formation of A12TiO5 through the solid-reaction betweenTiO2 and Al2O3.