(1. 湖北理工學院 機電工程學院，黃石 435003；
2. 華中科技大學 材料成形與模具技術國家重點實驗室，武漢 430074)
摘 要: 采用粉末冶金法制備TiC顆粒含量不同的316L不銹鋼復合材料，研究復合材料在800 ℃空氣中的恒溫氧化行為，分析TiC對復合材料氧化行為的影響和TiC的作用機制。結(jié)果表明：試樣表面形成的氧化膜以TiO2、Cr2O3、Fe3O4和FeCr2O4為主要組成相。TiC的引入可以導致富Cr離子保護性氧化膜的形成，有利于復合材料抗氧化性能提高；但添加過多的TiC會導致TiC顆粒的聚集，TiC氧化反應的氣體在顆粒聚集的區(qū)域集中產(chǎn)生和釋放，降低了氧化膜的致密程度，惡化了試樣的抗氧化性能。與其他試樣相比，10%TiC/316L復合材料試樣具有較好的抗氧化性能。
關鍵字: 復合材料；TiC；氧化行為；氧化膜
（1. School of Mechanic and Electric Engineering, Hubei Polytechnic University, Huangshi 435003, China;
2. State Key Laboratory of Material Processing and Die & Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:TiC/316L stainless steel composites with different particle contents were prepared by powder metallurgy. The isothermal oxidation behavior of TiC/316L composites sintered at 800 ℃ in air was investigated. The effect of TiC on the oxidation behaviors of composites and the mechanism of TiC during the oxidation of composites were analyzed. The results show that the oxidation layer formed on the surface of samples mainly consists of TiO2, Cr2O3, Fe3O4 and FeCr2O4. TiC additions result in the formation of Cr-ion-riched oxide film which is beneficial to improving the oxidation resistance of the composites. However, the composites with too much TiC additions cause the agglomeration of TiC particles, which results the generation of a large quantity of gas formed by the TiC oxidation react in the particle gathered area, thereby reduces the densification of oxidation film, and causes the deterioration of the oxidation performance. Compared with other specimens, the composites with 10%TiC additions possesses excellent oxidation resistance.
Key words: composites; TiC; oxidation behavior; oxidation film
