Characterization of Cracking within Thermal Spray Deposits by an Acoustic Emission Method-Extended Abstract

C. C. Berndt, C. K. Lin, S. H. Leigh

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Four-point bend tests with in situ acoustic emission (AE) were used to study the cracking behavior of alumina-3 % titania materials prepared by gas- and water-stabilized plasma technologies (GSP and WSP, respectively). Catastrophic failure was observed for GSP-sprayed samples while WSP-sprayed samples exhibited microcracking before failure. The amplitude and energy distributions were also investigated, and it was 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, may account for the differences in AE responses.

Original languageEnglish
Pages (from-to)334-336
Number of pages3
JournalJournal of Thermal Spray Technology
Issue number3
Publication statusPublished - Sep 1998
Externally publishedYes



  • Acoustic emission
  • Cracking mechanisms
  • Cracking of composites
  • Thermal spray

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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