Carbothermal synthesis of boron nitride coating on PAN carbon fiber

M. Das*, A. K. Basu, S. Ghatak, Amish G. Joshi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Boron nitride (BN) thin coating has been formed on the surface of chemically activated polyacrylonitrile (PAN) carbon fiber by dip coating method. Dip coating was carried out in saturated boric acid solution followed by nitridation at a temperature of 1200 °C in nitrogen at atmospheric pressure to produce BN coating. Chemical activation improved surface area of PAN fiber which favours in situ carbothermal reduction of boric acid. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) have shown the formation of boron nitride. The X-ray photoelectron spectroscopy reveals that the coating forms a composite layer of carbon, BN/BOxNy and some graphite like BCN with local structure of B-N-C and B(N-C)3. The oxidation resistance of the coated fiber was significantly higher than uncoated carbon fiber. Tensile strength measurement reveals that the BN coated fiber maintained 90% of its original strength. As compared to chemical vapor deposition (CVD), this process is simple, non-hazardous and is expected to be cost effective.

Original languageEnglish
Pages (from-to)2129-2134
Number of pages6
JournalJournal of the European Ceramic Society
Issue number10
StatePublished - Jul 2009
Externally publishedYes


  • Boron nitride
  • Carbon
  • Coating
  • Fiber
  • Strength


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