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

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

研究成果: 雜誌貢獻文章同行評審

7 引文 斯高帕斯(Scopus)


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.
頁(從 - 到)108-114
期刊Thin Solid Films
出版狀態已發佈 - 11月 21 1997

ASJC Scopus subject areas

  • 表面、塗料和薄膜
  • 凝聚態物理學
  • 表面和介面


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