(上海交通大学 金属基复合材料国家重点实验室, 上海 200030)
摘 要: 研究了TiB/Ti基复合材料在550， 600和650 ℃空气中的恒温氧化行为， 分析了增强体TiB对钛基复合材料氧化动力学行为的影响， 并用X射线衍射仪和配有能谱仪的扫描电子显微镜对氧化层表面的相组成、 形貌以及氧化层剖面的显微结构进行了分析。 结果表明： 该复合材料的氧化动力学曲线主要为抛物线类型； TiB/Ti基复合材料的氧化层由金红石型的氧化物TiO2组成， 没有发现B2O3的氧化物； 增强体TiB能够提高钛基复合材料的抗氧化性， 而且随着TiB增强体含量的增加， 钛基复合材料的抗氧化性增加； 这主要是因为TiB增强体促进了致密氧化膜的生成。
关键字: 原位合成； TiB/Ti基复合材料； 氧化； 氧化动力学
（ State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China）
Abstract: The isothermal oxidation behavior of TiB/Ti matrix composites (TMCs) at 550, 600 and 650 ℃ in air was investigated. The reaction products of the oxidation scale were examined by XRD. The surface morphology and cross-sectional microstructure of the oxidation scale were analyzed by SEM. The isothermal oxidation kinetic curves mainly follow parabolic rate law. An oxidation scale mainly consists of rutile-TiO2. No other oxides are observed within the oxide scale. The addition of TiB can improve the oxidation resistance of TMCs. Moreover, the content increase of TiB reinforcements can decrease the overall oxidation rate of TMCs at 550, 600, and 650 ℃. It is attributed to the formation of thin and dense oxidation film.
Key words: in-situ synthesized; TiB/Ti matrix composite; oxidation; oxidation kinetics
