采用粉末冶金法制备了TiB_2/Ti颗粒增强钛基复合材料,研究了不同烧结温度(800、900、1000和1100℃)TiB_2/Ti复合材料在600、700、800和900℃空气中的恒温氧化行为,分析了TiB_2对钛基复合材料氧化动力学行为的影响,并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:该复合材料的氧化层表面的氧化产物主要为金红石型TiO_2,此外还有Fe_2O_3、Al_2O_3和B_2O_3,未发现其它类型钛的氧化物;TiB_2/Ti复合材料800℃恒温空气中氧化的氧化动力学曲线初始阶段氧化速度较快,随着氧化时间的延长,形成的氧化膜减慢了氧化的速度;随着增强体TiB_2体积分数的增加和烧结温度的提高,复合材料的抗氧化性能提高,这主要是由于提高烧结温度和提高增强体TiB_2的体积分数均有利于氧化层的致密度提高,从而提高了材料的抗氧化性能.
TiB_2/Ti composites were fabricated by powder metallurgy. The isothermal oxidation behavior of TiB_2/Ti composites sintered at different temperatures (800,900,1000 and 1100℃) at 600,700,800 and 900℃ in air were investigated. he reaction products in the oxidation layer were examined by XRD. The surface morphology and cross-sectional microstructure of the oxidation layer were analyzed by SEM. The results show that an oxidation layer mainly consists of rutile-TiO_2,Fe_2O_3,Al_2O_3 and B_2O_3.No other Ti oxides are observed within the oxidation layer. Oxidation kinetics curves of TiB_2/Ti composites at 800℃ in air show that the oxidation speed is rapid at the beginning of oxidation, but with the increase of oxidation time the oxidation speed becomes slow due to the formation of an oxidation film. With the increase of volume fraction of TiB_2 reinforcements and sintering temperature, the oxidation resistance of TiB_2/Ti composites can be increased. It is attributed to the formation of the thin and dense oxidation film.
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