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| NiCrAlY/NiAl/ZrO2-Y2O3 Thermal Barrier Coatings Obtained by Detonation Spraying |
| WU Yingna; KE Peiling; SUN Chao; HUA Weigang; WANG Fuhui; WEN Lishi |
| State Key Laboratory for Corrosion and Protection; Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
WU Yingna; KE Peiling; SUN Chao; HUA Weigang; WANG Fuhui; WEN Lishi. NiCrAlY/NiAl/ZrO2-Y2O3 Thermal Barrier Coatings Obtained by Detonation Spraying. Acta Metall Sin, 2004, 40(5): 541-545 .
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Abstract In order to improve the oxidation resistance of thermal barrier coatings
(TBCs), Ni-25Cr-5Al-0.5Y/Ni-50Al/ZrO2-8Y2O3
(mass fraction, %) system was deposited on the alloy M22
by detonation spray. Detonation sprayed Ni-50Al (NiAl) layer, as a
diffusion barrier layer, is composed of δ-Ni2Al3,
β-NiAl and NiAl3. Isothermal oxidation
tests were carried at 1050,
1100 and 1150 ℃, in order to study the effect of NiAl layer
on the growth mechanism of oxidation film. The results indicate that
the mass gains of the triplex TBCs are obviously less than
those of duplex TBCs at the above temperatures. The
oxidation kinetics of triplex TBCs obeys the fourth
power law at 1050 and 1100 ℃, and the parabolic law at 1150 ℃.
NiAl layer can hinder the outward diffusion of
elements in the bond coat and promote the
formation of TGO consisted of Al2O3.
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Received: 08 May 2003
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