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Home List of Titles Investigation of cracking mechanisms of plasma sprayed alumina-13% titania by acoustic emission
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41690
- Investigation of cracking mechanisms of plasma sprayed alumina-13% titania by acoustic emission
- Lin, Chung Kwei; Leigh, Sang Ha; Gansert, Robert V.; Murakami, Kenji; Sampath, Sanjay; Herman, Herbert; Berndt, Christopher C.
- 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.
- Publication type
- Conference paper
- Materials Research Society Symposium Proceedings: Proceedings of the Fracture: instability dynamics, scaling, and ductile/brittle behavior symposium, Boston, Massachusetts, United States, 27 November-01 December 1995 / Robin L. Blumberg Selinger, John J. Mecholsky, Anders E. Carsson and Edwin R. Fuller Jr (eds.), Vol. 409, pp. 261-266
- Publication year
- Acoustic emissions; AE; Alumina; Amplitude distribution; Ceramic materials; Crack initiation; Energy distribution; Four point bend tests; Heat treatment; High temperature operations; Macrocracks; Materials testing; Mechanical failure; Microcracks; Models; Plasma spraying; Titanium compounds
- Materials Research Society
- 0272-9172 (series ISSN)
- 9781558993129, 1558993126
- Peer reviewed