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http://dx.doi.org/10.7234/composres.2017.30.2.084

Thermal and Mechanical Evaluation of Environmental Barrier Coatings for SiCf-SiC Composites  

Chae, Yeon-Hwa (Department of Mechanical Design, Kookmin University)
Moon, Heung Soo (Sewon Hard Facing Co.)
Kim, Seyoung (Korea Institute of Energy Research)
Woo, Sang Kuk (Korea Institute of Energy Research)
Park, Ji-Yeon (Korea Atomic Energy Research Institute)
Lee, Kee Sung (School of Mechanical Engineering, Kookmin University)
Publication Information
Composites Research / v.30, no.2, 2017 , pp. 84-93 More about this Journal
Abstract
This study investigates thermal and mechanical characterization of environmental barrier coating on the $SiC_f-SiC$ composites. The spherical environmental barrier coating (EBC) powders are prepared using a spray drying process for flowing easily during coating process. The powders consisting of mullite and 12 wt% of Ytterbium silicate are air plasma sprayed on the Si bondcoat on the LSI SiC fiber reinforced SiC composite substrate for protecting the composites from oxidation and water vapor reaction. We vary the process parameter of spray distance during air plasma spray of powders, 100, 120 and 140 mm. After that, we performed the thermal durability tests by thermal annealing test at $1100^{\circ}C$ for 100hr and thermal shock test from $1200^{\circ}C$ for 3000 cycles. As a result, the interface delamination of EBC never occur during thermal durability tests while stable cracks are prominent on the coating layer. The crack density and crack length depend on the spray distance during coating. The post indentation test indicates thermal tests influence on the indentation load-displacement mechanical behavior.
Keywords
Coatings; Thermal durability; Thermal shock; Mechanical properties;
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Times Cited By KSCI : 1  (Citation Analysis)
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