High temperature oxidation behavior of in-situ synthesized TiB2/Fe composites
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摘要: 采用微波烧结技术原位生成TiB2/Fe复合材料,研究其在500℃、600℃与700℃空气中的恒温氧化行为,并对氧化膜的表面、截面形貌及相组成进行了分析。结果表明:TiB2/Fe复合材料由TiB2、Fe2B和α-Fe三种物相组成。随着氧化温度的升高,TiB2/Fe复合材料的氧化增重明显增大,均呈现抛物线型规律,在500℃时,其氧化产物主要为Fe2O3和Fe3O4,而700℃时,其氧化物为Fe2O3、TiO2、Fe9TiO15及少量Fe3BO6组成。相同温度下,随着TiB2含量增加,TiB2/Fe复合材料氧化物粒径、氧化增重和氧化层厚度均减小,氧化激活能增大,其抗氧化性能也越好。Abstract: The in-situ TiB2/Fe composites were synthesized by microwave sintering. The isothermal oxidation behavior of TiB2/Fe composites was investigated in air at 500℃, 600℃ and 700℃. The surface, cross-sectional morphology and phase composition of the oxide films were also analyzed. The results show that the in-situ TiB2/Fe composites are composed of TiB2, Fe2B and α-Fe phases. With the oxidation temperatures increasing, the oxidation weight of TiB2/Fe composites increases obviously and shows the law of parabolic. At 500℃, the main oxidation products of the composites are Fe2O3 and Fe3O4. At 700℃, the oxides are composed of Fe2O3, TiO2, Fe9TiO15 and Fe3BO6. With the increase of TiB2 contents, the oxide particle size, oxidation mass and oxide layer thickness of TiB2/Fe composites decrease at the same temperature, and the oxidation activation energy increases, which leads to the improvement of the oxidation resistance of TiB2/Fe composites.
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Key words:
- in situ synthesis /
- microwave sintering /
- TiB2 /
- Fe /
- composites /
- high temperature oxidation
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