热障涂层后处理技术研究进展

热障涂层是一种降低航空发动机热端部件表面温度、提高发动机推力和效率的热防护技术,但其服役于高温、高压、高交变应力等恶劣环境而易脱落失效.对热障涂层的后处理技术进行了阐述,论述了真空热处理、热等静压处理、激光重熔、激光上釉、激光熔覆等后处理技术的方法和原理,并对比了不同工艺的优缺点.最后,展望了激光表面改性技术的应用前景和未来发展趋势.

Research Progress on Post-Treatment Technology of Thermal Barrier Coatings

Thermal barrier coating is a thermal-protection technology that reduces the surface temperature of the hot components of the aero-engine and improves the thrust and efficiency of the engine. However,the thermal barrier coating is susceptible to spalling and failure when they are serviced in harsh environments such as high temperature,high pressure,high alternating stress,etc. The post-treatment technology of thermal barrier coating was reviewed in this paper,the methods and principles of post-treatment techniques such as vacuum heat treatment,hot isostatic pressing,laser remelting,laser glazing and laser cladding were discussed,and the advantages and disadvantages in different processes were compared. Finally,application prospects and future development trends of laser surface modification technology are prospected.