热喷涂过程中热障涂层的残余应力

Residual stress of ceramic thermal barrier coating system during thermal spraying

热障涂层技术是解决航空发动机和燃气轮机高温服役的核心技术之一。它不仅能阻隔热燃气,还能防止叶片被氧化、腐蚀、侵蚀等造成的损坏。当热障涂层在复杂服役环境中长时间使用时,制备中产生的残余应力容易导致热障涂层与基体之间产生剥落和开裂等问题。因此,深入研制热障涂层制备过程中的热应力因素,对热障涂层的设计、制备和强度评估具有重要意义,对航空发动机和燃气轮机的安全服役具有重要意义。介绍了热障涂层热喷涂制备中应力问题的最新研究进展。总结了近5年制备技术(主要包括:喷涂参数、粘结层温度和粗糙度、热处理、激光表面重熔)对热应力影响的研究,涉及理论、实验和数值分析几个方面。

Thermal barrier coatings(TBCs)technology is one of the core technologies to solve the service of aviation engine and gas turbine at high temperature.It can not only hinder thermal fuel gas,but also avoid oxidation,corrosion,erosion of foreign material on the blade caused by damage.Therefore,an in-depth study of the factors of thermal stress in the TBCs preparation is of great significance for the design,preparation and strength evaluation of TBCs,and plays an important role in the safety service of aero-engine and gas turbine.The research progresses in the last five years on the stress problem in the preparation of TBCs thermal spraying was reviewed,including the influence of preparation technology such as spray parameter,bond coat(BC)temperature and roughness,thermal treatment,laser surface remelting on thermal stress in the point of views of theory,experiments and analysis.