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Thermal shock resistance of polycrystalline cubic boron nitride

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Author(s)
Carolan, Declan 
Ivankovic, Alojz 
Murphy, Neal 
Uri
http://hdl.handle.net/10197/4613
Date Issued
August 2012
Date Available
26T16:19:41Z September 2013
Abstract
The effect of thermal shock on the exural strength has been investigated experimentally. It was found that the variation in exural strength with quench temperature was influenced by the CBN grain size. Polycrystalline material containing small CBN grains showed a discontinuous drop in measured exural strength above a material dependent critical quench temperature difference, delta Tc. The sharp decrease in measured strength is accompanied by unstable crack propagation. Material containing a significantly larger CBN grain size, exhibited a gradual decrease in strength above the critical quench conditions. The experimental observations agreed with an established theory developed for thermal shock of alumina. The theoretically calculated critical temperatures agree well with the observed experimental data for each material when a aw size equal to the CBN grain size is employed.
Type of Material
Journal Article
Publisher
Elsevier
Journal
Journal of the European Ceramic Society
Volume
32
Issue
10
Start Page
2581
End Page
2586
Copyright (Published Version)
2012 Elsevier
Keywords
  • Cubic Boron Nitride

  • fracture

  • thermal shock

DOI
10.1016/j.jeurceramsoc.2012.03.013
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Mechanical & Materials Engineering Research Collection
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