Thermal shock resistance of polycrystalline cubic boron nitride

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Title: Thermal shock resistance of polycrystalline cubic boron nitride
Authors: Carolan, Declan
Ivankovic, Alojz
Murphy, Neal
Permanent link: http://hdl.handle.net/10197/4613
Date: Aug-2012
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
Copyright (published version): 2012 Elsevier
Keywords: Cubic Boron Nitride;fracture;thermal shock
DOI: 10.1016/j.jeurceramsoc.2012.03.013
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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