Abstract
Carbide layer growth behaviour in a chemically vapour deposited molybdenum coating on graphite was evaluated by performing isothermal annealing tests at elevated temperatures. By measuring the carbide layer growth in the coating, it was determined that the layer growth obeyed a parabolic law with annealing time. The diffusion coefficient of carbon in the carbide layer grown in the molybdenum coating was several times larger than that in the carbide layer grown in the bulk molybdenum sheet. The activation energy for the carbon diffusion in the coating was estimated to be smaller than that of in the bulk molybdenum sheet. It was also found that the diffusion coefficient increased and the activation energy decreased when the diameter of the columns in the coating decreased. These results suggest that grain boundary diffusion of carbon in the coating played an important role in the carbide layer growth behaviour in the coating.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
