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http://dx.doi.org/10.4191/kcers.2017.54.6.02

Effects of Healing Agent on Crack Propagation Behavior in Thermal Barrier Coatings  

Jeon, Soo-Hyeok (School of Materials Science and Engineering, Changwon National University)
Jung, Sung-Hoon (School of Materials Science and Engineering, Changwon National University)
Jung, Yeon-Gil (School of Materials Science and Engineering, Changwon National University)
Publication Information
Journal of the Korean Ceramic Society / v.54, no.6, 2017 , pp. 492-498 More about this Journal
Abstract
A thermal barrier coating (TBC) with self-healing property for cracks was proposed to improve reliability during gas turbine operation, including structural design. Effect of healing agent on crack propagation behavior in TBCs with and without buffer layer was investigated through furnace cyclic test (FCT). Molybdenum disilicide ($MoSi_2$) was used as the healing agent; it was encapsulated using a mixture of tetraethyl orthosilicate and sodium methoxide. Buffer layers with composition ratios of 90 : 10 and 80 : 20 wt%, using yttria stabilized zirconia and $MoSi_2$, respectively, were prepared by air plasma spray process. After generating artificial cracks in TBC samples by using Vickers indentation, FCTs were conducted at $1100^{\circ}C$ for a dwell time of 40 min., followed by natural air cooling for 20 min. at room temperature. The cracks were healed in the buffer layer with the healing agent of $MoSi_2$, and it was found that the thermal reliability of TBC can be enhanced by introducing the buffer layer with healing agent in the top coat.
Keywords
Thermal barrier coating; Healing agent; Encapsulation; Crack propagation; Thermal reliability;
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