期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 96, 期 1, 页码 299-307出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1551-2916.2012.05460.x
关键词
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资金
- National Science Foundation [DMR0605700]
- U.S. Dept. of Energy [DE-FC26-05NT42643]
- NSF [DMR11-21053]
- International Center for Materials Research at UCSB under NSF [DMR 0843934]
- Direct For Mathematical & Physical Scien [0843934] Funding Source: National Science Foundation
- Division Of Materials Research [0843934] Funding Source: National Science Foundation
The correlation between microstructural and phase evolution in aged, yttria-partially-stabilized zirconia, air plasma-sprayed coatings is discussed. Freestanding coatings with the dense, vertically cracked structure were isothermally aged at 1482 degrees C (2700 degrees F) in air. Characterization of the resulting microstructures was conducted using transmission electron microscopy, then compared with a parallel analysis of the phase evolution via synchrotron X-ray diffraction (XRD) described in Part I. Additional context was provided by related studies on vapor-deposited coatings. Several salient points can be extracted from these assessments. XRD was further validated as a practical method for studying phase stability after clarification of how the possible phases are defined, including the following: (i) the nature of the t' phase observed in XRD after phase decomposition has begun and (ii) the relationship between the Y-rich tetragonal (t?) and Y-rich cubic (c) phases reported to coexist via XRD. A strong relationship between the initial microstructure and the subsequent phase destabilization is also reported. As a result, phase evolution is proposed to proceed via two competing routes. The interplay between these mechanisms dictates the incubation time for monoclinic formation within a given coating.
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