YANG Yingfei, REN Pan, BAO Zebin,DENG Chunming, LI Wei. Hot Corrosion Behavior of Typical Bond Coats in Thermal Barrier Coatings Systems. Aeronautical Manufacturing Technology, 2020, 63(14): 34-40/47.
YANG Yingfei, REN Pan, BAO Zebin,DENG Chunming, LI Wei. Hot Corrosion Behavior of Typical Bond Coats in Thermal Barrier Coatings Systems. Aeronautical Manufacturing Technology, 2020, 63(14): 34-40/47. DOI: 10.16080/j.issn1671-833x.2020.14.034.
Hot Corrosion Behavior of Typical Bond Coats in Thermal Barrier Coatings Systems
In order to investigate the hot corrosion behavior of the commonly-used bond coats for thermal barrier coating system
four typical bond coats (i.e.
plain NiAl coating
NiCoCrAlY coating
Pt modified NiAl coating and Pt+Hf co-modified NiAl coating) were comparably evaluated in the mixed salts of Na2SO4/NaCl (mass fraction 75%∶25%) at 900℃. The phase constitution evolution and microstructure change during hot corrosion were analyzed by scanning electron microscope (SEM)
electron probe micro-analyzer (EPMA) and X–ray diffractometer (XRD). The results showed that plain NiAl coating degrades fastest during hot corrosion test. In contrast
the degradation rate of NiCoCrAlY coating is slower. The hot corrosion resistance of the two modified NiAl coatings is satisfactory
Pt modified NiAl is the best among the four coatings. It seems that the addition of Hf does not benefit the hot corrosion resistance of Pt–Al coating.