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A 4.5μm-thick Cr film prepared by a double glow sputtering technique was deposited on a magnetic Sm(Co bal Fe 0.22 Cu 0.08 Zr 0.02 ) 7.5 alloy to improve its oxidation resistance. Oxidation tests in air at 700°C indicate that the Cr film grew a Cr 2 O 3 scale, profoundly preventing the oxidation of the SmCo-based alloy. The coated alloy only...
A Sm(Co 0.68 Fe 0.22 Cu 0.08 Zr 0.02 ) 7.5 alloy was arc-ion-plated with a thin Cr 2 O 3 film. It completely prevented the external oxidation and sufficiently suppressed the internal oxidation of the alloy in air at 700°C for 20h, causing the alloy to form only a very shallow layer where the Sm oxidation occurred. The mechanism for the effect...
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