热喷涂YSZ TBCs的激光重熔研究现状与展望

Research Progress and Prospects of Laser Remelting of Thermal Sprayed YSZ TBCs

摘要:

热障涂层（thermal barrier coatings，TBCs）可有效降低先进涡轮和发动机热端部件的实际工作温度并提升其服役可靠性和耐久性。氧化钇稳定氧化锆（yttria-stabilized zirconia，YSZ）TBCs是目前主流的热障涂层体系，但随着推重比的不断升高，对YSZ TBCs的性能提出了更高的要求。激光重熔作为表面强化技术的重要手段，被诸多研究者证明可用于强化YSZ TBCs并提升其综合性能。本文综述了激光重熔对热喷涂YSZ TBCs微观组织结构和性能的影响与强化机制，包括微观形貌、相组成以及抗热冲击性能、抗高温氧化性能、抗熔融氧化物（CMAS）腐蚀破坏性能和抗冲蚀性能等。最后对该技术的发展趋势进行了展望，对热喷涂YSZ TBCs的激光重熔研究和应用具有一定的参考和借鉴意义。

Abstract:

Thermal barrier coatings (TBCs) can effectively reduce the actual operating temperature of hot-end components of advanced turbines and engines and improve their service reliability and durability. Yttria-stabilized zirconia (YSZ) TBCs are currently the most mainstream thermal barrier coating system, but as the thrust-to-weight ratio continues to increase, higher requirements have been placed on the performance of YSZ TBCs. As an important surface strengthening technique, laser remelting has been proven by many researchers to be used to strengthen YSZ TBCs and improve their overall performance. In this paper, the effects of laser remelting on the microstructure and properties of thermal sprayed YSZ TBCs and the strengthening mechanism are reviewed, including their microstructure, phase composition, thermal shock resistance, high- temperature oxidation resistance, calcium-magnesium-aluminum-silicon (CMAS) corrosion resistance and foreign-particle erosion resistance. Finally, the future development of this technique is discussed, which provides valuable reference for the research and application of thermal sprayed YSZ TBCs by laser remelting.