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Hardness and adhesive properties of (Cr, Mo) oxycarbide films on stainless steel via vapor deposition

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Abstract

A hexacarbonyl of chromium and molybdenum [(Cr, Mo) (CO)6] was used as an oxycarbide source for the coating on stainless steel 304 (SS304) at temperatures from 175 ºC to 450 ºC. Hardness of the films was determined from a microindentation technique through a similar calculation after Thomas (1987). Intrinsic hardnesses of the films formed at low and medium temperatures were determined to be 8.61 and 2.75 GPa, respectively. Both of them are larger than that of SS304 substrate, 1.75 GPa. Adhesive strength of the films was measured by the scratching test. The results reveal that the adhesive strengths of the films formed at low, medium, and high temperatures are 2.8 N, 37.6 N, and 36.0 N, respectively. Two different fracture modes after scratching were found for the films obtained at various temperature regions. A spalling-off type or a deformation failure with many cracks and deformation bands beside the striation was found.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan, 106, Republic of China

    Ming Hung Lo & Wen Cheng J. Wei

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  1. Ming Hung Lo
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  2. Wen Cheng J. Wei
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Lo, M.H., Wei, W.C.J. Hardness and adhesive properties of (Cr, Mo) oxycarbide films on stainless steel via vapor deposition. Journal of Materials Research 11, 2895–2902 (1996). https://doi.org/10.1557/JMR.1996.0366

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  • DOI: https://doi.org/10.1557/JMR.1996.0366

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