Effect of Al2O3 layer on improving high-temperature oxidation resistance of siliconized TiAl-based alloy |
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| Affiliation: | 1. National University of Science and Technology “MISIS”, Leninsky pr. 4, 119049 Moscow, Russia;2. Technological Institute for Superhard and Novel Carbon Materials (TISNCM), 7a Centralnaya str., 142190 Troitsk, Moscow, Russia;1. Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Honda R&D Co., Ltd., 1-4-1 Chuo, Wako-shi, Saitama 351-0193, Japan;1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. National Engineering Research Center for High-Speed EMU, CSR Qingdao Sifang Co., Ltd., Qingdao 266111, China;1. Institute of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, PR China;2. Henan Key Laboratory of Mechanical Equipment Intelligent Manufacturing, Zhengzhou University of Light Industry, Zhengzhou, 450002, PR China;3. School of Energy and Power Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, PR China;4. School of Material Science and Engineering, Harbin Institute of Technology, Harbin, 150001, PR China |
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| Abstract: | TiAl-based specimens were siliconized with two different kinds of cementation respectively, one is 23 vol.% Si + 77 vol.% Al2O3, and the other is 23 vol.% Si + 77 vol.% ZrO2. SEM observation showed that a Ti5Si3-based layer, in which some Al2O3 particles dispersed, formed on the surface after siliconization. Further observation showed that an extra outer Al2O3 layer existed on the surface of specimens siliconized with 23 vol.% Si + 77 vol.% Al2O3, while no such Al2O3 layer was found in specimens siliconized with 23 vol.% Si + 77 vol.% ZrO2. The cyclic oxidation test performed at 900 °C shows that the oxidation resistance was significantly improved by siliconizing. By comparison, the specimens that siliconized with 23 vol.% Si + 77 vol.% Al2O3 exhibits a better oxidation resistance than that with 23 vol.% Si + 77 vol.% ZrO2. It was deduced that the extra outer Al2O3 layer is beneficial to the oxidation resistance of siliconized TiAl-based alloy. |
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