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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/41675
- Title
- Acoustic emission responses of plasma-sprayed alumina-3% titania deposits
- Author(s)
- Lin, Chung Chieh; Leigh, Sang Ha; Berndt, Christopher C.
- Abstract
- Free standing alumina-3% titania samples were prepared by gas- and water-stabilized plasma (GSP and WSP) spraying. These free standing forms consisted of metastable γ- and δ-alumina, as well as α-Al2O3. The microstructures of the materials were similar for both plasma spraying methods and typically exhibit distinct boundaries around splats, columnar grains, and inter- and intra-lamellar porosity. The modulus of rupture (MOR) and porosity were also similar for both GSP- and WSP-sprayed specimens. Four point bend tests with in situ acoustic emission (AE) were used to study the cracking behavior of these materials. Catastrophic failure was observed for GSP-sprayed samples while WSP-samples exhibited microcracking before failure. The amplitude and energy distributions were also investigated and it was thereby determined that the percentage of macrocracks for GSP-sprayed samples is much larger than for WSP-sprayed samples. The processing effects, which induced differences in microstructure, can account for the differences in AE responses.
- Publication type
- Journal article
- Source
- Thin Solid Films, Vol. 310, no. 1-2 (Nov 1997), pp. 108-114
- Publication year
- 1997
- Keyword(s)
- Acoustic emission testing; AE; Alumina; Crack initiation; Crystal microstructure; Emission responses; Grain boundaries; GSP spraying; Modulus of rupture; MOR; Plasma-sprayed alumina; Plasma spraying; Porosity; Protective coatings; Titania deposits; Titanium dioxide; WSP spraying
- Publisher
- Elsevier
- ISSN
- 0040-6090
- Publisher URL
- http://dx.doi.org/10.1016/S0040-6090(97)00366-0
- Copyright
- Copyright © 1997 Elsevier Science S.A.
- Peer reviewed
