期刊
JOURNAL OF THERMAL SPRAY TECHNOLOGY
卷 21, 期 5, 页码 950-962出版社
SPRINGER
DOI: 10.1007/s11666-012-9780-z
关键词
hollow powder; nonlinear elastic property; plasma-spray processing; thermal barrier coatings
资金
- National Science Foundation GOALI program [CMMI-1030492]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1030492] Funding Source: National Science Foundation
The properties and performance of plasma-sprayed thermal barrier coatings (TBCs) are strongly dependent on the microstructural defects, which are affected by starting powder morphology and processing conditions. Of particular interest is the use of hollow powders which not only allow for efficient melting of zirconia ceramics but also produce lower conductivity and more compliant coatings. Typical industrial hollow spray powders have an assortment of densities resulting in masking potential advantages of the hollow morphology. In this study, we have conducted process mapping strategies using a novel uniform shell thickness hollow powder to control the defect microstructure and properties. Correlations among coating properties, microstructure, and processing reveal feasibility to produce highly compliant and low conductivity TBC through a combination of optimized feedstock and processing conditions. The results are presented through the framework of process maps establishing correlations among process, microstructure, and properties and providing opportunities for optimization of TBCs.
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