Isothermal and dynamic oxidation behaviour of Mo−W doped carbon-based coating

MANDAL, Paranjayee, EHIASARIAN, Arutiun and HOVSEPIAN, Papken (2015). Isothermal and dynamic oxidation behaviour of Mo−W doped carbon-based coating. Applied Surface Science, 353, 1291-1309.

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Abstract

The oxidation behaviour of Mo−W doped carbon-based coating (Mo−W−C) is investigated in elevated temperature (400°C−1000°C). Strong metallurgical bond between Mo−W−C coating and substrate prevents any sort of delamination during heat-treatment. Isothermal oxidation tests show initial growth of metal oxides at 500°C, however graphitic nature of the as-deposited coating is preserved. The oxidation progresses with further rise in temperature and the substrate is eventually exposed at 700°C. The performance of Mo−W−C coating is compared with a state-of-the-art coating, which shows preliminary oxidation at 400°C and local delamination of the coating at 500°C leading to substrate exposure. The graphitisation starts at 400°C and the diamond-like structure is completely converted into the graphite-like structure at 500°C. Dynamic oxidation behaviour of both the coatings is investigated using Thermo-gravimetric analysis carried out with a slow heating rate of 1°C/min from ambient temperature to 1000°C. Mo−W−C coating resists oxidation up to ~800°C whereas delamination of coating is observed beyond ~380°C. In summary, Mo−W−C coating provides improved oxidation resistance at elevated temperature compared to coating.

Item Type:	Article
Additional Information:	Available online 15 July 2015
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
Identification Number:	https://doi.org/10.1016/j.apsusc.2015.07.057
Page Range:	1291-1309
Depositing User:	Yashodhan Purandare
Date Deposited:	25 Jun 2015 09:26
Last Modified:	18 Mar 2021 05:24
URI:	https://shura.shu.ac.uk/id/eprint/10433

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