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Investigation of Chemical and Physical Surface Changes of Thermally Conditioned Glass Fibres

Jenkins, Peter, Yang, Liu, Thomason, James, Chen, Xinyong, Watts, John F and Hinder, Steven J (2019) Investigation of Chemical and Physical Surface Changes of Thermally Conditioned Glass Fibres Fibers, 7 (1).

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Abstract

A number of analytical techniques were applied to investigate changes to the surface of unsized boron-free E-glass fibres after thermal conditioning at temperatures up to 700 °C. Novel systematic studies were carried out to investigate the fundamental strength loss from thermal conditioning. Surface chemical changes studied using X-ray photoelectron spectroscopy (XPS) showed a consistent increase in the surface concentration of calcium with increasing conditioning temperature, although this did not correlate well with a loss of fibre strength. Scanning electron microscopy fractography confirmed the difficulty of analysing failure-inducing flaws on individual fibre fracture surfaces. Analysis by atomic force microscopy (AFM) did not reveal any likely surface cracks or flaws of significant dimensions to cause failure: the observation of cracks before fibre fracture may not be possible when using this technique. Fibre surface roughness increased over the whole range of the conditioning temperatures investigated. Although surface roughness did not correlate precisely with fibre strength, there was a clear inverse relationship at temperatures exceeding 400 °C. The interpretation of the surface topography that formed between 400–700 °C produced evidence that the initial stage of phase separation by spinodal decomposition may have occurred at the fibre surface.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Jenkins, Peter
Yang, Liu
Thomason, James
Chen, Xinyong
Watts, John FJ.Watts@surrey.ac.uk
Hinder, Steven JS.Hinder@surrey.ac.uk
Date : 15 January 2019
Funders : Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.3390/fib7010007
Copyright Disclaimer : © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : Glass fibre; Heat treatment; Strength loss; X-ray photoelectron spectroscopy (XPS); Atomic force microscopy (AFM)
Depositing User : Clive Harris
Date Deposited : 31 Jan 2019 14:18
Last Modified : 31 Jan 2019 14:18
URI: http://epubs.surrey.ac.uk/id/eprint/850335

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