Das, Mitun and Basu, A K and Ghatak, Sankar and Joshi, Amish G (2009) 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 degrees 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 fort-nation of boron nitride. The X-ray photoelectron spectroscopy reveals that the coating forms a composite layer of carbon, BN/BO(x)N(y) 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. (C) 2008 Elsevier Ltd. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Carbon; Fiber; Boron nitride; Coating; Strength
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Ashok K Podder
Date Deposited:	22 Feb 2012 06:28
Last Modified:	04 Oct 2012 12:32
URI:	http://cgcri.csircentral.net/id/eprint/990

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