Morphological evolution and weak interface development within chemical-vapor-deposited zirconia coating deposited on Hi-Nicalon™ fiber

Hao Li, Jinil Lee, Matthew R. Libera, Woo Y. Lee, Anteneh Kebbede, Michael J. Lance, Hongyu Wang, Gregory N. Morscher

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The phase contents and morphology of a ZrO2 fiber coating deposited at 1050°C on Hi-Nicalon™ by chemical vapor deposition (CVD) were examined as a function of deposition time from 5-120 min. The morphological evolution in the ZrO2 coating was correlated to the development of delamination within the ZrO2 coating. The delamination appears to occur as a result of: (i) continuous formation of tetragonal ZrO2 nuclei on the deposition surface; (ii) martensitic transformation of the tetragonal phase to a monoclinic phase on reaching a critical grain size; and (iii) development of significant compressive hoop stresses because of the volume dilation associated with the transformation. Our observations suggest that it will be of critical importance to further understand and eventually control the nucleation and grain growth behavior of CVD ZrO2 and its phase transformation behavior for its potential applications for composites.

Original languageEnglish
Pages (from-to)1561-1568
Number of pages8
JournalJournal of the American Ceramic Society
Volume85
Issue number6
DOIs
StatePublished - Jun 2002

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