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http://dx.doi.org/10.4191/kcers.2018.55.6.06

Thermal Durability of Thermal Barrier Coatings in Furnace Cyclic Thermal Fatigue Test: Effects of Purity and Monoclinic Phase in Feedstock Powder  

Park, Hyun-Myung (School of Materials Science and Engineering, Changwon National University)
Jun, Soo-Hyk (School of Materials Science and Engineering, Changwon National University)
Lyu, Guanlin (School of Materials Science and Engineering, Changwon National University)
Jung, Yeon-Gil (School of Materials Science and Engineering, Changwon National University)
Yan, Byung-Il (Doosan Heavy Industries & Construction)
Park, Kwang-Yong (Doosan Heavy Industries & Construction)
Publication Information
Journal of the Korean Ceramic Society / v.55, no.6, 2018 , pp. 608-617 More about this Journal
Abstract
The effects of the purity and monoclinic phase of feedstock powder on the thermal durability of thermal barrier coatings (TBC) were investigated through cyclic thermal exposure. Bond and top coats were deposited by high velocity oxygen fuel method using Ni-Co based feedstock powder and air plasma spray method using three kinds of yttria-stabilized zirconia with different purity and monoclinic phase content, respectively. Furnace cyclic thermal fatigue test was performed to investigate the thermal fatigue behavior and thermal durability of TBCs. TBCs with high purity powder showed better sintering resistance and less thickness in the thermally grown oxide layer. The thermal durability was found to strongly depend on the content of monoclinic phase and the porosity in the top coat; the best thermal fatigue behavior and thermal durability were in the TBC prepared with high purity powder without monoclinic phase.
Keywords
Thermal barrier coating; Feedstock powder; Monoclinic phase; Purity; Thermal durability;
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