Acoustic emission responses of plasma-sprayed alumina-3% titania deposits

Chung Kwei Lin, Sang H. Leigh, Christopher C. Berndt

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 infra-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.

Original languageEnglish
Pages (from-to)108-114
Number of pages7
JournalThin Solid Films
Volume310
Issue number1-2
Publication statusPublished - Nov 21 1997
Externally publishedYes

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Keywords

  • Emission responses
  • Plasma-sprayed alumina
  • Titania deposits

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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