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Effect of microstructure and grain boundary chemistry on slow crack growth in silicon carbide at ambient conditions

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Title: Effect of microstructure and grain boundary chemistry on slow crack growth in silicon carbide at ambient conditions
Authors: Al Nasiri, N
Ni, N
Saiz, E
Chevalier, J
Giuliani, F
Vandeperre, LJ
Item Type: Journal Article
Abstract: Silicon carbide (SiC) is being used increasingly as a room temperature structural material in environments where moisture cannot always be excluded. Unfortunately, there have been almost no reports on slow crack growth (SCG) in SiC at room temperature. To address this gap, SCG in SiC was studied using constant stress rate and double torsion tests in water. SiC based materials were produced with a wide range of grain boundary chemistries and microstructures, which may affect their slow crack growth behaviour. To clarify the role of chemistry and microstructure respectively, solid state (SS) sintering with carbon and boron along with liquid phase (LP) sintering using oxides additives were used to produce materials with fine and coarse grains. The LP-SiC was three times more sensitive to SCG than SS-SiC materials. Moreover, the larger grained material with a higher toughness was less sensitive to SCG than the materials with fine grains.
Issue Date: 1-Aug-2015
Date of Acceptance: 19-Feb-2015
URI: http://hdl.handle.net/10044/1/49069
DOI: 10.1016/j.jeurceramsoc.2015.02.020
ISSN: 0955-2219
Publisher: Elsevier
Start Page: 2253
End Page: 2260
Journal / Book Title: Journal of the European Ceramic Society
Volume: 35
Issue: 8
Copyright Statement: © 2015 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/F033605/1
Keywords: Science & Technology
Technology
Materials Science, Ceramics
Materials Science
Slow crack growth
SiC
Toughness
Grain morphology
MECHANICAL-PROPERTIES
FRACTURE-TOUGHNESS
DYNAMIC FATIGUE
BEHAVIOR
CERAMICS
GLASSES
PHASE
PROPAGATION
STRENGTH
0912 Materials Engineering
Materials
Publication Status: Published
Online Publication Date: 2015-03-05
Appears in Collections:Mechanical Engineering
Materials
Faculty of Natural Sciences
Faculty of Engineering