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Failure Evaluation of a SiC/SiC Ceramic Matrix Composite During In-Situ Loading Using Micro X-ray Computed Tomography

Published online by Cambridge University Press:  04 March 2019

John Thornton ,
Benedicta D. Arhatari Open the ORCID record for Benedicta D. Arhatari [Opens in a new window] ,
Mitchell Sesso ,
Chris Wood ,
Matthew Zonneveldt ,
Sun Yung Kim ,
Justin A. Kimpton  and
Chris Hall
John Thornton
Affiliation:
Aerospace Division, Defence Science and Technology Group, 506 Lorimer Street, Fishermans Bend, Victoria 3207, Australia
Benedicta D. Arhatari*
Affiliation:
Department of Chemistry and Physics, ARC Centre of Excellence in Advanced Molecular Imaging, La Trobe University, Bundoora, Victoria 3086, Australia
Mitchell Sesso
Affiliation:
Swinburne University of Technology, John Street, Hawthorn, Victoria 3122, Australia
Chris Wood
Affiliation:
Aerospace Division, Defence Science and Technology Group, 506 Lorimer Street, Fishermans Bend, Victoria 3207, Australia
Matthew Zonneveldt
Affiliation:
Aerospace Division, Defence Science and Technology Group, 506 Lorimer Street, Fishermans Bend, Victoria 3207, Australia
Sun Yung Kim
Affiliation:
Swinburne University of Technology, John Street, Hawthorn, Victoria 3122, Australia
Justin A. Kimpton
Affiliation:
Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
Chris Hall
Affiliation:
Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
*
*Author for correspondence: Benedicta D. Arhatari, E-mail: [email protected]
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Abstract

In this study, we have examined ceramic matrix composites with silicon carbide fibers in a melt-infiltrated silicon carbide matrix (SiC/SiC). We subjected samples to tensile loads while collecting micro X-ray computed tomography images. The results showed the expected crack slowing mechanisms and lower resistance to crack propagation where the fibers ran parallel and perpendicular to the applied load respectively. Cracking was shown to initiate not only from the surface but also from silicon inclusions. Post heat-treated samples showed longer fiber pull-out than the pristine samples, which was incompatible with previously proposed mechanisms. Evidence for oxidation was identified and new mechanisms based on oxidation or an oxidation assisted boron nitride phase transformation was therefore proposed to explain the long pull-out. The role of oxidation emphasizes the necessity of applying oxidation resistant coatings on SiC/SiC.

Keywords

Ceramic-matrix composites (CMCs)CT analysisdamage mechanicsmicrostructures
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 25 , Issue 3 , June 2019 , pp. 583 - 591
Copyright
Copyright © Microscopy Society of America 2019 

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