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

Fingerprint

Titanium deposits
Aluminum Oxide
acoustic emission
Acoustic emissions
Alumina
aluminum oxides
titanium
Porosity
deposits
Plasmas
Microcracking
Microstructure
Plasma spraying
Spraying
Titanium
Gases
Water
bend tests
porosity
Processing

Keywords

  • Emission responses
  • Plasma-sprayed alumina
  • Titania deposits

ASJC Scopus subject areas

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

Cite this

Acoustic emission responses of plasma-sprayed alumina-3% titania deposits. / Lin, Chung Kwei; Leigh, Sang H.; Berndt, Christopher C.

In: Thin Solid Films, Vol. 310, No. 1-2, 21.11.1997, p. 108-114.

Research output: Contribution to journalArticle

Lin, CK, Leigh, SH & Berndt, CC 1997, 'Acoustic emission responses of plasma-sprayed alumina-3% titania deposits', Thin Solid Films, vol. 310, no. 1-2, pp. 108-114.
Lin, Chung Kwei ; Leigh, Sang H. ; Berndt, Christopher C. / Acoustic emission responses of plasma-sprayed alumina-3% titania deposits. In: Thin Solid Films. 1997 ; Vol. 310, No. 1-2. pp. 108-114.
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