Microstructure and lifetime of Hf or Zr doped sputtered NiAlCr bond coat/7YSZ EB-PVD TBC systems

SURFACE & COATINGS TECHNOLOGY

卷:335

Article

Munoz Saldana, J.^1,2  Schulz, U.¹  Mondragon Rodriguez, G. C.^1,3  Caceres-Diaz, L. A.²  Lau, H.^1,4 

[1] Inst Mat Res, DLR, German Aerosp Ctr, Cologne, Germany

[2] IPN, Ctr Invest & Estudios Avanzados, Lib Norponiente 2000, Queretaro 76230, Qro, Mexico

[3] CIDESI, Ctr Engn & Ind Dev, Av Pie Cuesta 702, Queretaro 76125, Qro, Mexico

[4] Lloyds Register EMEA, Adolf Grimme Allee 3, D-50829 Cologne, Germany

关键词: Thermal barrier coating;    Sputtering;    Bond coats;    Furnace cyclic tests;   

DOI  :  10.1016/j.surfcoat.2017.12.017

来源: Elsevier

【 摘 要 】

NiAlCr-X overlay coatings deposited by magnetron sputtering on IN100 and CMSX-4 superalloys and thereafter top-coated with 7YSZ thermal barrier coatings by EB-PVD were investigated with emphasis on the effects of superalloy type and Hf or Zr doping. The sputtered films in the as coated condition (after EB-PVD deposition) showed strong diffusion effects of different elements from the superalloys. The measured phase content of beta and gamma' was in good agreement with calculated data obtained from experimental compositions normalized to a Ni-Al-Cr system following the guidelines of site preference of ternary alloying elements. Microstructure evolution and failure characteristics after furnace cyclic tests at 1100 degrees C were investigated as well. The lifetime of the coatings is equivalent to standard MCrAlY TBCs systems and is compared to PtAl and NiCoCrAlY coatings from literature. The effects of microstructure and elements diffusing from the substrates into the bond coat (Ti, Co, Mo and Ta) in combination with the effect of Hf- or Zr-doping is presented and discussed.

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