Oxidation behavior of in-situ Al2O3/TiAl composites at 900℃ in static air |
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作者单位: | Tao-tao Ai,Xiao-ming Feng(Department of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723003,China);Fen Wang(School of Materials Science and Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China)
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基金项目: | This work was financially supported by the Special Program of the Education Bureau of Shaanxi Province of China (No. 08JK240) and the Breeding Program for Provincial Level Key Research Base of Shaanxi University of Technology (No.SLGJD0806). |
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摘 要: |
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关 键 词: | 复合材料 氧化行为 原位 空气 静止 抗氧化性能 二氧化钛 低热膨胀系数 |
Oxidation behavior of in-situ Al2O3/TiAl composites at 900℃ in static air |
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Authors: | Tao-tao Ai Fen Wang Xiao-ming Feng |
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Affiliation: | [1]Department of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723003, China [2]School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China |
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Abstract: | In-situ Al2O3/TiAl composites were successfully synthesized from the starting powders of Ti, Al, TiO2 and Nb2O5. The oxidation behavior of the composites at 900℃ in static air was investigated. The results indicate that the composite samples present a much lower oxidation mass gain. Under long-time intensive oxidation exposure, the formed oxide scale is multi-layer. The formation of the outer TiO2 layer is fine and dense, the internal Al2O3 scale has good adhesiveness with the outer TiO2 scale, and the TiO2+Al2O3 mixed layer forming the protective oxide scale is favorable for the improvement of oxidation resistance. It is believed that the incorporation of Al2O3 particulates into the metal matrix decreases the coefficient of thermal expansion of the substrate, and forms a local three-dimensional network structure that can hold the oxide scale. The formation of the oxide scale with fmer particle size, stronger adherence, less micro-defects and slower growth rate can contribute to the improvement of oxidation resistance. Nb element plays an important role in reducing the internal oxidation action of the materials, restraining the growth of TiO2 crystals andpromoting thc stable formation of the Al 2O3-riched layer,which is benfeicial to improve the oxidation properties. |
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Keywords: | intermetallic matrix composites alumina oxidation resistance scale spallation high temperature |
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