Influence of Pulse Frequency on Mullite Coatings Prepared by Pulse Arc Discharge Deposition Process and Activation Energy

Abstract:

Mullite coatings were prepared on C/C-SiC composites surface by pulse arc discharge deposition using mullite powder as source materials. Phase composites and microstructures of the as-prepared mullite coatings were characterized by XRD and SEM. Deposition kinetics and influence of pulse frequency on the phase composites and microstructures were investigated. The results indicate that the outer layer is composed of mullite phase, density and homogeneity of the mullite coatings are achieved when the pulse frequency reaches 2000 Hz. The deposition amount of the mullite coatings also increases with increasing deposition temperature. The deposition mass of the coatings and the square root of the deposition time at different deposition temperatures according to linear relationship, and the deposition activation energy is calculated to be 32.24 kJ/mol.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 635-641
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.635
• Online since: December 2014
• Authors: Bo Zhang, Jian Feng Huang*, Cui Yan Li, Li Yun Cao, Hai Bo Ouyang, Lei Zhou, Zhe Bai
• Keywords: Carbon/Carbon Composites, Deposition Kinetics, Mullite, Pulse Frequency

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