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HIGH TEMPERATURE OXIDATION BEHAVIOR OF PURE NiAND ITS SPUTTERED NANOCRYSTALLINE COATING |
Shujiang Geng;Shenglong Zhu;Fuhui Wang |
中科院金属所;金属腐蚀与防护国家重点实验室 |
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Abstract A nanocrystalline coating with the same compositio n as pure Ni was deposited on the pure Ni substrate by means of magnetron sputte ring.The oxidation behavior of pure Ni and its sputtered nanocrystalline coatin g in air at 700℃~900℃ was studied.The samples were examined by scanning tunne l microscopy(STM),scanning electron microscopy(SEM)with energy dispersive X-ray (EDX)and X-ray diffraction(XRD).The results indicated that the mass gain of t he nanocrystalline pure Ni was higher than that of normal grain-sized pure Ni at the same temperature.Nanocrystallization accelerated the oxidation of pure Ni,e specially at the very early stage.It is proposed that nanocrystallization may al so lead to an increase of oxidation rate at the very early stage for oxidation o f any multi-element alloy,and it is by this mechanism that nanocrystallization p romotes the selective oxidation of alloys.
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Received: 13 May 2002
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Corresponding Authors:
Shujiang Geng
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