The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900℃ in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20AI coating after 200 h oxidation. However, owing to the segregation of...The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900℃ in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20AI coating after 200 h oxidation. However, owing to the segregation of Ni3Al during oxidation process at high temperature, the spinel NiAI2O4 was also formed in the Al2O3 layer. It was found that the formation of NiAI204 had no detrimental effect on the oxidation resistance of the sputtered N?3O-20AI coating due to the excellent adhesion shown by the Al2O3 and NiAl2O4complex oxide scale.展开更多
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...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.展开更多
基金National Natural Science Foundation of China !under grant 59671060
文摘The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900℃ in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20AI coating after 200 h oxidation. However, owing to the segregation of Ni3Al during oxidation process at high temperature, the spinel NiAI2O4 was also formed in the Al2O3 layer. It was found that the formation of NiAI204 had no detrimental effect on the oxidation resistance of the sputtered N?3O-20AI coating due to the excellent adhesion shown by the Al2O3 and NiAl2O4complex oxide scale.
文摘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.
