A nanocrystalline Ni-30Cr-8Al-0.5Y coating was deposited on a Ni-base superalloy by magnetron sputtering. Post-aluminizing was performed on the sputtered coating to improve the corresponding high-temperature properties. The isothermal oxidation behavior at 1000 similar to 1100 degrees C and hot-corrosion behavior in the presence of 75 wt.% Na2SO4+25 wt.% K2SO4/NaCl film at 900 degrees C of the sputtered coating with and without aluminizing have been investigated using TGA, SEM/EDS, XRD and EPMA, respectively. The results indicated that the sputtered NiCrAlY coating possessed excellent oxidation resistance at 1000 degrees C due to the presence of extensive amount of chromium and good amount of aluminum. Because of the excessive consumption of Al in the coating, it lost protection at 1100 degrees C. The mass gain of the aluminized NiCrAlY coating was a little higher than that of the sputtered coating due to the formation of the rapid growth theta-Al2O3 phase at 1000 degrees C. At 1100 degrees C the oxidation resistance of the latter was better than that of the former. The sputtered coating provided a limited protection at the transient hot-corrosion stage in the molten salt film and degenerated completely with time. On the contrary, the aluminized NiCrAlY coating showed much better hot-corrosion resistance in the presence of 75 wt.% Na2SO4+K2SO4/NaCl film as a result of the formation of a continuous and protective Al2O3 scale. (c) 2005 Elsevier B.V. All rights reserved.
部门归属
chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. liaoning tech univ, dept mat sci & engn, fuxing 123000, peoples r china.;ren, x (reprint author), chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china;renxin74@tom.com
X. Ren,F. H. Wang. High-temperature oxidation and hot-corrosion behavior of a sputtered NiCrAlY coating with and without aluminizing[J]. Surface & Coatings Technology,2006,201(1-2):30-37.
APA
X. Ren,&F. H. Wang.(2006).High-temperature oxidation and hot-corrosion behavior of a sputtered NiCrAlY coating with and without aluminizing.Surface & Coatings Technology,201(1-2),30-37.
MLA
X. Ren,et al."High-temperature oxidation and hot-corrosion behavior of a sputtered NiCrAlY coating with and without aluminizing".Surface & Coatings Technology 201.1-2(2006):30-37.
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