贾平平.TiAl-Nb基合金高温抗氧化研究进展[J].表面技术,2018,47(3):224-230.
JIA Ping-ping.High-temperature Antioxidation of TiAl-Nb Based Alloys[J].Surface Technology,2018,47(3):224-230 |
| TiAl-Nb基合金高温抗氧化研究进展 |
| High-temperature Antioxidation of TiAl-Nb Based Alloys |
| 投稿时间：2017-09-26 修订日期：2018-03-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.03.036 |
| 中文关键词: TiAl-Nb基合金 合金化 表面合金化 高温抗氧化涂层 抗氧化机理 |
| 英文关键词:TiAl-Nb based alloy alloying surface alloying high-temperature oxidation resistant coatings antioxidation mechanisms |
| 基金项目:陕西省军民融合基金研究项目（16JMR04）；渭南师范学院重点科研项目（17YKF05） |
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| 中文摘要: |
| TiAl-Nb基合金具有优异的综合性能，在先进飞行器及武器等耐高温部件中有巨大的应用潜力，但其高温抗氧化性能无法满足实际使用需求。综述了TiAl-Nb基合金高温抗氧化防护方面的研究进展，包括TiAl-Nb基合金的多元合金化、表面合金化、抗氧化涂层及其抗氧化机理，通过分析不同氧化防护措施的特性，展望了TiAl-Nb基合金高温抗氧化防护的发展趋势。国内外研究结果显示，通过多元合金化方法改善合金组织，并在氧化过程中促进形成保护性Al2O3而抑制形成TiO2，是提高TiAl-Nb基合金高温抗氧化性能的有效手段。利用表面合金化对合金表面的显微组织和成分进行改善，氧化时促进抗氧化性能优良的Al2O3或SiO2保护膜形成，显著提高了TiAl-Nb基合金的抗氧化性能。但高温下合金化层与基体之间的Al、Si、Ti等元素的互扩散会加剧合金化层的退化，进行表面多元合金化，特别是添加微量活性元素，对促进保护性氧化膜的形成及抑制互扩散有良好效果。通过制备表面抗氧化涂层，在氧化时生成保护性氧化膜，阻碍O的内扩散，能够起到良好的高温抗氧化作用，但需要解决涂层/基体合金的结合力较差和反应扩散等问题，制备复合涂层或扩散阻挡层是解决上述问题的有效途径。 |
| 英文摘要: |
| 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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