Title: Effects of microstructure design and feedstock species in the bond coat on thermal stability of thermal barrier coatings

Authors: Seoung Soo Lee; SooHyeok Jeon; Je-Hyun Lee; Yeon-Gil Jung; Sang-Won Myoung; Byung-Il Yang; Zhe Lu

Addresses: School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' School of Advanced Materials Engineering, Changwon National University, 20-1 Changwondaehak-ro, Uichang-gu, Changwon 641-773, South Korea ' Advanced Process Development Team, Doosan Heavy Industries & Corporation, 22 DoosanVolvo-ro, Seongsan-gu, Changwon, Gyeongnam51711, South Korea ' Advanced Process Development Team, Doosan Heavy Industries & Corporation, 22 DoosanVolvo-ro, Seongsan-gu, Changwon, Gyeongnam51711, South Korea ' School of Materials and Metallurgical Engineering, University of Science and Technology Liaoning, Anshan, Liaoning Province, China

Abstract: The effects of the microstructure design and feedstock species in a bond coat on the thermal stability of thermal barrier coatings (TBCs) were investigated through thermal shock (TS) tests. Three kinds of feedstock (AMDRY 9951 : cobalt (Co)-based feedstock, AMDRY 997 : nickel (Ni)-based feedstock, and AMDRY 9624 : Ni-based feedstock) were employed for the single layer bond coat and the first layer in the double layer bond coat, which were prepared by high velocity oxy-fuel process. The second layer in the bond coat and the top coat was formed by air plasma spray process using Ni-based metallic powder (AMDRY 962) and 8YSZ (METCO 204 C-NS), respectively. The TS tests were performed till more than 50% of the region spalled in the TBC. The TBC system with the Co-based bond coat showed a better thermal durability than those with the Ni-based bond coats. The TBC systems with the double layer in the bond coat showed a better lifetime performance than those with the single layer, independent of the feedstock species.

Keywords: TBCs; thermal barrier coating; composition; microstructure; bond coat; thermal shock test; thermal stability.

DOI: 10.1504/IJNT.2018.096345

International Journal of Nanotechnology, 2018 Vol.15 No.6/7, pp.545 - 554

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 21 Nov 2018 *

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