Das, M. and Basu, A. K. and Ghatak, S. and Joshi, Amish G. (2008) Carbothermal synthesis of boron nitride coating on PAN carbon fiber. Journal of the European Ceramic Society , 29 (10). pp. 2129-2134. ISSN 0955-2219

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Abstract

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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Carbon; Fiber; Boron nitride; Coating; Strength
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	14 Aug 2012 11:04
Last Modified:	14 Aug 2012 11:04
URI:	http://npl.csircentral.net/id/eprint/413

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