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A novel four-layer structured Cr–Al–O tandem nano-multilayer composite coating has been prepared by cathodic arc ion plating for solar selective absorbing. The four-layer structured coating consists of pure chromium layer, low oxygen content Cr–Al–O layer (LOCL), middle oxygen content Cr–Al–O layer (MOCL) and high oxygen content Cr–Al–O layer (HOCL). The composition, structure, and surface morphology...
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