摘要
The microstructure change of sputtered Ni-3Cr-10Al nanocrystalline coating during oxidation in air at 900°C was observed and its eNct on oxide formation on the sputtered coating was studied. Twe results indicated that Ni3Al was segmpated during oxidation, on which Nio could be easily formcd. NiO could react with the trunsient γ-Al2O3 to form NiAl2O4 through solid reaction, whtch can be found on the oxide scale afer 200h oxidation. Thewtre, the oxide scale formed on sputtered Ni-3Cr10Al coating was not composed of a unltary layer of Al2 O3. Thc Al2O3 and NiAl2 O4 complex oxide scale bonded properly with substrate and showed gpod adhesion and good oxidation resistance.
The microstructure change of sputtered Ni-3Cr-10Al nanocrystalline coating during oxidation in air at 900°C was observed and its eNct on oxide formation on the sputtered coating was studied. Twe results indicated that Ni3Al was segmpated during oxidation, on which Nio could be easily formcd. NiO could react with the trunsient γ-Al2O3 to form NiAl2O4 through solid reaction, whtch can be found on the oxide scale afer 200h oxidation. Thewtre, the oxide scale formed on sputtered Ni-3Cr10Al coating was not composed of a unltary layer of Al2 O3. Thc Al2O3 and NiAl2 O4 complex oxide scale bonded properly with substrate and showed gpod adhesion and good oxidation resistance.
