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采用粉末冶金法制备了TiB2/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℃)TiB2/Ti复合材料在600、700、800和900℃空气中的恒温氧化行为,分析了TiB2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TiO2,此外还有Fe2O3、Al2O3和B2O3,未发现其它类型钛的氧化物;TiB2/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TiB2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TiB2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。
TiB2 / Ti particles reinforced titanium matrix composites were prepared by powder metallurgy. The oxidation of TiB2 / Ti composites at 600, 700, 800 and 900 ℃ in air at different sintering temperatures (800, 900, 1000 and 1100 ℃) The effect of TiB2 on the oxidation kinetics of titanium matrix composites was analyzed. The phase composition, morphology and the microstructure of the oxide layer were also analyzed. The results show that the oxidation products on the oxide layer of the composite are mainly rutile TiO2, Fe2O3, Al2O3 and B2O3, and no other type of titanium oxide is found. The oxidation of TiB2 / Ti composite in air at 800 ℃ The oxidation rate of the kinetic curve is faster at the initial stage, and the oxidation film slows down the oxidation rate as the oxidation time prolongs. With the increase of TiB2 volume fraction and sintering temperature, the oxidation resistance of the composites increases , Which is mainly due to the improvement of the sintering temperature and the increase of the volume fraction of TiB2. All these contribute to the increase of the density of the oxide layer and thus the oxidation resistance of the material.