|
|
|
| Current Research Status of Doping Modified–NiAl Bond Coat for Thermal Barrier Coating System |
| DONG Hui, WANG Heyu, ZHOU Panhu, DU Yongqi |
| Xi’an Key Laboratory of High Performance Oil and Gas Field Materials, Xi’an Shiyou University, Xi’an 710065, China |
|
|
|
|
Abstract 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.
|
|
|
|
|
|
|
|
|
2022, 
