TiAl基合金高温防护及热障涂层体系研究进展

doi:10.11896/cldb.24020147

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Abstract Since 1970s, TiAl-based alloys have been used as a new lightweight high temperature structure candidate material because of their low density, high specific strength, ablative resistance, and good high-temperature mechanical properties. With the deepening of research on various strengthening and toughening measures, the problem of room temperature brittleness of TiAl-based alloys has been gradually solved. TiAl-based alloys have been successfully applied to aero-engine blades, aerospace vehicle skins, rudder wings, automobile exhaust valves, etc.
However, the lack of high-temperature oxidation resistance of TiAl-based alloys limits their application as high-temperature components. At present, the high-temperature oxidation resistance of TiAl-based alloys is mainly improved by two methods: integral alloying and surface modification. Integral alloying is to add Nb, Si, Mo, W, rare earth and other alloying elements to the alloy, which promotes the formation of a dense oxide scale on the surface of the alloy and improves the adhesion between the oxide scale and the substrate. Surface modification mainly includes surface alloying and surface coating. Surface alloying technology generally includes thermal diffusion, ion implantation, pre-oxidation, laser surface alloying and so on. Surface coating technology is to use different kinds of coatings to improve the surface properties of the substrate, such as Ti-Al-X systemcoating, MCrAlY thermal barrier coating, ceramic coating, composite coating.
Thermal barrier coating, as a coating material in surface modification, has excellent oxidation resistance and long-term service performance. When applied to the surface of TiAl-based alloy, it can effectively improve the high-temperature oxidation resistance of the alloy. However, the combination of the thermal barrier coating and TiAl-based alloys also has the following problems. The excessive growth of thermal grown oxides leads to interface failure, and the elements interdiffusion between the coating and the substrate is serious, resulting in the long-term service performance of the thermal barrier coating/TiAl-based alloy system is weakened.
In this paper, the high-temperature oxidation behavior of TiAl-based alloys is summarized and analyzed. The influencing factors and mechanism of high-temperature protection of TiAl-based alloys are reviewed from two aspects of integral alloying and surface modification. The problems faced by the application of thermal barrier coatings on the surface of TiAl alloys are analyzed and the improvement scheme is proposed, in order to provide a reference for improving the high-temperature oxidation resistance of TiAl alloy and developing thermal barrier coating/TiAl alloy system.

Key words： TiAl-based alloy thermal barrier coating oxidation resistance integral alloying surface modification

Published: 25 February 2025 Online: 2025-02-18

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TG174.4

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	Articles by authors
	ZHANG Yefei
	JIANG Haitao
	TIAN Shiwei
	ZHANG Siyuan
	LI Chong

Cite this article:

ZHANG Yefei,JIANG Haitao,TIAN Shiwei, et al. Research Progress of High Temperature Protection and Thermal Barrier Coating System of TiAl-based Alloys[J]. Materials Reports, 2025, 39(4): 24020147-10.

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https://www.mater-rep.com/EN/10.11896/cldb.24020147 OR https://www.mater-rep.com/EN/Y2025/V39/I4/24020147

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