原位生成TiC_p增强钛基复合材料的高温氧化

Study on Oxidation Behavior of In-situ Synthesized TiC_p/Ti Matrix Composite

针对钛基复合材料发展应用中的关键问题——高温氧化性能,通过800℃高温进行氧化实验得到了氧化增重特性,并利用扫描电镜SEM(Soanning Electron Microscope)、能谱仪EDS(Electronic Differential System)和X衍射XRD(X-ray Diffractometer)研究了钛基复合材料经氧化试验后表面氧化层的结构、相组成及成分。结果表明:钛基复合材料的氧化规律为抛物线规律,以Ti6Al为基的钛基复合材料比以纯钛为基的钛基复合材料具有更好的抗高温氧化性能,增强体含量越高,复合材料的抗氧化性越佳。TiC颗粒及其与基体的界面对复合材料的氧化物形成有重要的影响,Al原子的加入改变了材料的氧化机制。

The key problem about the application of titanium matrix composites in high temperature is the oxidation resistance. The oxidation enhancement of the in-situ synthesized particle-reinforced titanium matrix composites was realized at 800℃. The SEM, EDS and XRD were used to detect the microstructure and the composition. Experimental results show that the titanium matrix composite basically follows a parabolic rule at high temperature. The oxidation resistance of Ti6Al matrix composite is stronger than that of Ti matrix composite. The titanium matrix composite has the higher oxidation resistance when the mass fraction of TiCpincreases. The TiCp and the interface between the particle and the matrix play an important role in forming the oxide of the composite. Al changes the oxidation mechanism of the composite.