热障涂层NiAl黏结层掺杂改性研究现状

Current Research Status of Doping Modified–NiAl Bond Coat for Thermal Barrier Coating System

目前,航空发动机和燃气轮机的使用温度均已超过1000℃,传统黏结层材料MCrAlY的性能逐渐无法满足需求。NiAl具有熔点高、密度低、成本低和抗氧化性能优异等特点,因此有很大的应用潜力。然而NiAl高温强度低,氧化层附着性较差,需要对其掺杂改性以提高NiAl的高温性能,主要包括掺杂铂族元素(Pt、Ru、Pd等)和活性元素(Hf、Zr、Dy等)以及纳米晶颗粒(CeO_(2)、Al_(2)O_(3)、ZrC等)。简要概述了掺杂的不同作用,通过单独或共同掺杂,可以减缓TGO的生长,降低互扩散系数,增加氧化层黏附性,提高NiAl涂层的使用性能。

At present,the operating temperatures of aero-engines and gas turbines have exceeded 1000℃,and the performance of traditional bond coat material MCrAlY has gradually been unable to meet the demand.NiAl intermetallic has high melting point,low density,low cost and excellent oxidation resistance,which offers its great potential in application.However,the high temperature strength of NiAl is low and the adhesion of its oxide scale is poor,so it is compulsory to modify NiAl to enhance its high-temperature performance by doping platinum group elements(Pt,Ru,Pd,etc.),reactive elements(Hf,Zr,Dy,etc.)and nanocrystalline particles(CeO_(2),Al_(2)O_(3),ZrC,etc.).The different roles of these doping manners are briefly summarized.By doping alone or together,the growth rate of TGO can be slowed down,the mutual diffusion coefficient can be reduced,the adhesion of oxide scale can be increased,and the overall performance of NiAl coating can be improved.