Oxidation and hot corrosion resistance of HVOF/EB-PVD thermal barrier coating system

Döleker K. M., ÖZGÜRLÜK Y., KAHRAMAN Y., KARAOĞLANLI A. C.

SURFACE & COATINGS TECHNOLOGY, cilt.409, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 409
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.surfcoat.2021.126862
  • Dergi Adı: SURFACE & COATINGS TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Biotechnology Research Abstracts, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Thermal barrier coatings (TBCs), High-velocity oxygen fuel (HVOF), Oxidation, Thermally grown oxide (TGO), Yttria-stabilized zirconia (YSZ), Gadolinium zirconate (Gd2Zr2O7), HIGH-TEMPERATURE OXIDATION, ISOTHERMAL OXIDATION, TOP COATS, BEHAVIOR, GD2ZR2O7, YSZ, CONDUCTIVITY, TBCS, MICROSTRUCTURE, SINGLE
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

Hot corrosion and oxidation cause very destructive damage in thermal barrier coatings (TBCs) during service conditions. In hot corrosion, TBCs exposed to molten salts lose their integrity easily due to the phase transformations while oxygen easily penetrates from the TBCs to bond coats and forms thermally grown oxide (TGO) layer which causes higher stresses at the interface of bond and top coating. In the current study, CoNiCrAlY powders were sprayed by high-velocity oxygen fuel (HVOF) technique on Inconel 718, and then yttria-stabilized zirconia (YSZ) and YSZ/Gd2Zr2O7 ingots were deposited by electron beam physical vapor deposition (EB-PVD) technique on the bond coated substrates. Isothermal oxidation tests were carried out at 1000 degrees C for 8, 24, 50, and 100 h, while hot corrosion tests were carried out at 1000 degrees C in the presence of NaCl, Na2SO4, and V2O5 molten salts with 5, 10, 15, and 20 h cycles. The produced coatings, as well as the oxidation and hot corrosion test results, were examined using SEM, EDS, XRD, and image analysis techniques. After the tests, the Gd2Zr2O7 layer was found to exhibit superior oxidation and hot corrosion performance as compared to the conventional YSZ TBC system.