Mechanical and oxidation resistance of remanufactured NiCoCrAlYTa coating deposited via arc ion plating

作者：Fan, Tao; Peng, Jihua^*; Shi, Qian; Lin, Songsheng; Dai, Mingjiang; Tang, Peng; Zheng, Caifeng; Yang, Hongzhi

来源：Journal of Materials Science, 2022, 57(40): 19131-19142.

DOI：10.1007/s10853-022-07786-5

• THERMAL BARRIER COATINGS
• MICROSTRUCTURAL EVOLUTION
• BOND-COAT
• TENSILE PROPERTIES
• ALUMINA SCALE
• BEHAVIOR
• REMOVAL
• SUPERALLOY
• TRANSFORMATIONS
• INTERDIFFUSION

NiCoCrAlYTa coating of the Ni-based superalloy substrate was processed using a feasible remanufacturing method. The coating was deposited using arc ion plating (AIP) and removed by a complex treatment of immersion-etching in hydrochloric acid solution and wet sandblasting. The conventional and remanufactured coatings were homogenized in vacuum at 1080 degrees C for 4 h and then oxidized isothermally in the air at 1050 degrees C for 200 h. The constituent phases and the microstructure were characterized using powder X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Additionally, the mechanical performance of the coated specimens was evaluated via tensile testing at room temperature and stress rupture testing at 982 degrees C/220 MPa. The complex treatment is found to effectively remove the NiCoCrAlYTa coating without causing damage to the substrate. The re-coated specimens had a tensile yield strength greater than 985 MPa at room temperature, a rupture life of 45 h at 982/220 MPa, and an oxidation rate constant K-p of 3.16 x 10(-12 )g(2) cm(-4) s(-1) at 1050 degrees C, which were nearly identical to those of the conventionally coated specimens. @@@ [GRAPHICS] @@@ .

• 单位
  湘潭大学