| JIA Ping-ping.High-temperature Antioxidation of TiAl-Nb Based Alloys[J],47(3):224-230 |
| High-temperature Antioxidation of TiAl-Nb Based Alloys |
| Received:September 26, 2017 Revised:March 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.03.036 |
| KeyWord:TiAl-Nb based alloy alloying surface alloying high-temperature oxidation resistant coatings antioxidation mechanisms |
| Author | Institution |
| JIA Ping-ping |
School of Mathematics and Physics, Weinan Normal University, Weinan , China |
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| Abstract: |
| TiAl-Nb based alloys have great application potential in high temperature components of advanced aircrafts and weapons due to excellent overall performance. However, high-temperature oxidation resistance of these alloys could not meet requirements of actual service. Research progress on high-temperature antioxidation protection of TiAl-Nb based alloys was reviewed, covering multi-alloying, surface alloying, oxidation resistant coatings and high-temperature antioxidation mechanisms. Meanwhile, characteristics of different oxidation protection measures were analyzed, and development trend of high-temperature antioxidation protection of TiAl-Nb based alloys were prospected. Domestic and foreign studies showed that multi-alloying was an effective way to promote the high-temperature oxidation resistance of TiAl-Nb based alloys by improving microstructures and/or promoting formation of protective Al2O3 scale while suppressing formation of TiO2 during oxidation. Surface alloying could significantly promote oxidation resistance of TiAl-Nb based alloys by improving microstructures and constituents of alloy surface, and promoting formation of Al2O3 or SiO2 protective films during oxidation. However, inter-diffusion of Al, Si and Ti etc. between alloying layer and the substrates would exacerbate degradation of the alloying layer. Surface multi-alloying especially addition of minor reactive elements had good effects on promoting formation of protective oxide films and suppressing inter-diffusion. Preparing oxidation resistant coatings which formed protective oxide film and suppressed internal diffusion of O during oxidation was also an effective way to achieve excellent high-temperature oxidation resistance of the alloys. However, poor bonding strength and reaction-diffusion between the coatings and substrates should be solved carefully, and preparing composite coatings or diffusion impervious layers is proved to be effective in resolving above problems. |
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