TiAl合金双辉等离子表面合金化技术研究进展

Research Progress of Double Glow Plasma Surface Alloying Technology on TiAl Alloy

摘要:

TiAl合金因其密度低、比强度高以及高温抗蠕变性能优异等特点，在航空航天等高温领域的结构部件中具有重要的应用价值。然而，750 ℃以上高温环境中TiAl合金高温抗氧化性能不足，以及部分部件在高温熔盐腐蚀及高温磨损等工况下服役寿命会缩短，此类问题均限制了TiAl合金的工程化应用。双辉等离子表面合金化技术是在不改变材料整体性能的前提下提升其表面防护能力的重要途径。本文介绍了双辉等离子表面合金化技术的基本原理，探讨了双辉等离子单元渗、双元渗、多组元共渗以及渗层成分及结构对渗层高温抗氧化、抗熔盐腐蚀、耐高温磨损等性能的影响，最后，从理论研究、制备工艺以及工程应用角度展望了未来的发展方向。

Abstract:

TiAl alloy has important application value in aerospace and other high-temperature structural components due to its low density, high specific strength, and excellent creep resistance at high temperature. However, the high-temperature oxidation resistance of TiAl alloy in the environment above 750 ℃ is poor and the service life of some high-temperature service components under the condition of hot corrosion and high-temperature wear is reduced, which restrict its application. Double glow plasma alloying surface technology is an important way to enhance the surface protection ability without changing the overall performance of the substrate. The basic mechanism of the double glow plasma surface alloying technology was reviewed. The unit infiltration, dual infiltration, multi-component co-infiltration, and the composition and structure of infiltration coatings on high temperature oxidation resistance, hot corrosion resistance, and wear resistance were discussed. Finally, it outlined the future developing trends in the view of theoretical research, preparation process, and engineering applications.