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Investigation Of Cracking Mechanisms Of Plasma Sprayed Alumina-13% Titania By Acoustic Emission

Published online by Cambridge University Press:  15 February 2011

C.K. Lin ,
S.H. Leigh ,
R.V. Gansert ,
K. Murakami ,
S. Sampath ,
H. Herman  and
C.C. Berndt
C.K. Lin
Affiliation:
The Thermal Spray Laboratory Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook, NY 11794–2275
S.H. Leigh
Affiliation:
The Thermal Spray Laboratory Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook, NY 11794–2275
R.V. Gansert
Affiliation:
The Thermal Spray Laboratory Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook, NY 11794–2275
K. Murakami
Affiliation:
The Institute of Scientific and Industrial Research Osaka University Osaka 567, Japan
S. Sampath
Affiliation:
The Thermal Spray Laboratory Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook, NY 11794–2275
H. Herman
Affiliation:
The Thermal Spray Laboratory Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook, NY 11794–2275
C.C. Berndt
Affiliation:
The Thermal Spray Laboratory Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook, NY 11794–2275
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Abstract

Free standing alumina-13% titania samples were manufactured using high power water stabilized plasma spraying. Heat treatment was performed at 1450°C for 24 hours and then at 1100°C for another 24 hours. Four point bend tests were performed on the as-sprayed and heat-treated samples in both cross section and in-plane orientations with in situ acoustic emission monitoring to monitor the cracking during the tests. Catastrophic failure with less evidence of microcracking was observed for as-sprayed samples. Energy and amplitude distributions were examined to discriminated micro- and macro-cracks. It was found that the high energy (> 100) and high amplitude (say > 60 dB) responses can be characterized as macro-cracks. Physical models are proposed to interpret the AE responses under different test conditions so that the cracking mechanisms can be better understood.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 261
Copyright
Copyright © Materials Research Society 1996

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