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- W2000495175 abstract "The thermal stability of a hydrogen free C/CrC coating was the focus of this study. The coating was deposited by unbalanced magnetron sputtering of graphite and Cr metal targets in a non-reactive argon atmosphere at high ion irradiation conditions. The coating possessed a nanocomposite structure with amorphous carbon embedded in a metastable NaCl (B1) structure CrC matrix. The nanometre amorphous carbon clusters formed layers within the CrC matrix, producing a self-assembled multilayer structure. In this paper, degradation of the multilayer nanocomposite structure and NaCl (B1) structure CrC phase was evaluated by annealing at 700°C in Ar+5%H2 atmosphere for 30 minutes. Microstructures of the as-deposited and annealed coating were characterised using Raman spectroscopy and cross-sectional transmission electron microscopy (TEM) coupled with electron energy filtered mapping. Raman spectroscopy suggested the presence of graphitic carbon in the coating after annealing, together with a trace of Cr2O3 associated with coating growth defects. TEM investigation of the cross sections of annealed coating revealed regions of C enrichment at the very top (∼40 nm) and bottom (∼10 nm) of the coating, which was confirmed by Raman spectroscopy. However, the central region of the coating retained its composite C/CrC multilayer structure. Tentative mechanisms of C enrichment are proposed. The advantages and limitations of Raman spectroscopy and TEM techniques in studying C/CrC coating are also discussed." @default.
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- W2000495175 date "2009-06-01" @default.
- W2000495175 modified "2023-09-27" @default.
- W2000495175 title "Degradation of a C/CrC PVD coating after annealing in Ar+H2at 700°C studied by Raman spectroscopy and transmission electron microscopy" @default.
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- W2000495175 doi "https://doi.org/10.3184/096034009x462971" @default.
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