An electron microscopic study of nickel sulfide inclusions in toughened glass

Barry, J. C. and Ford, S. (2001) An electron microscopic study of nickel sulfide inclusions in toughened glass. Journal of Materials Science, 36 15: 3721-3730. doi:10.1023/A:1017921732763


Author Barry, J. C.
Ford, S.
Title An electron microscopic study of nickel sulfide inclusions in toughened glass
Journal name Journal of Materials Science   Check publisher's open access policy
ISSN 0022-2461
Publication date 2001-08
Sub-type Article (original research)
DOI 10.1023/A:1017921732763
Volume 36
Issue 15
Start page 3721
End page 3730
Total pages 10
Place of publication Dordrecht
Publisher Kluwer Academic Publisher
Collection year 2001
Language eng
Subject C1
291400 Materials Engineering
670902 Structural glass and glass products
Abstract It has been known since the early sixties that nickel sulfide inclusions cause spontaneous fracture of toughened (thermally tempered) glass, but despite the considerable amount of work done on this problem in the last four decades, failures still occur in the field with regularity. In this study we have classified (by viewing through a 60x optical microscope) inclusions into two groups, which are classic and atypical nickel sulfides. The classics look like the nickel sulfide inclusions found at the initiation-of-fracture of windows that have broken spontaneously. We have compared the structure and composition of the atypical inclusions with the structure and composition of the classics. All of the classic and atypical nickel sulfide inclusions studied in this work were found to have a composition in the range of Ni52S48 to Ni48S52. Inclusions on the nickel rich side of stoichiometric NiS were found to be two-phase assemblies, and inclusions on the sulphur rich side of NiS were single phase. It had been proposed that the atypicals were passive, and of a different composition to the classics. However, we found that the difference between passive and dangerous nickel sulfide inclusions was not a difference in composition but rather a difference in the type of material in the internal pore space. The passive's had carbon char in their internal pore space, whereas the pore space of dangerous inclusions contained Na2O. The presence of Na2O and carbon char with the inclusions indicates that the formation of the inclusions results from a reaction of a nickel-rich phase with sodium sulphate and carbon. (C) 2001 Kluwer Academic Publishers.
Keyword Materials Science, Multidisciplinary
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Microscopy and Microanalysis Publications
 
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Created: Tue, 14 Aug 2007, 14:55:08 EST