Effect of NiCoCrAlY/NiCoCrAlYHfSi Bond Coat Mixing Ratio on the Thermal Cycling and Isothermal Oxidation Performance of Thermal Barrier Coatings

Hansol Kwon; Sang-hyun Park; Eungsun Byon; Sunghun Lee; Yeon Woo Yoo; Yong-Jin Kang; Hunkwan Park; Youngjin Park; Se-Yun Kim; Do Hyun Kim

doi:10.6108/KSPE.2026.30.4.013

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2026 Vol.30, Issue 4 Preview Page Next Page

RESEARCH PAPERS

Effect of NiCoCrAlY/NiCoCrAlYHfSi Bond Coat Mixing Ratio on the Thermal Cycling and Isothermal Oxidation Performance of Thermal Barrier Coatings 본드 코트의 NiCoCrAlY/NiCoCrAlYHfSi 혼합비 변화에 따른 열차폐 코팅 열사이클 및 등온산화 성능의 영향

31 August 2026. pp. 13-22

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Abstract

Optimization of bond coat composition is critical for improving the lifetime of thermal barrier coatings (TBCs) used in gas turbine components. In this study, the effects of blending ratios of NiCoCrAlY and NiCoCrAlYHfSi powders on isothermal oxidation at 1,100°C and furnace cyclic testing (FCT) performance were investigated. Coatings were deposited on CM939 superalloy substrates using HVOF(bond coat) and APS(top coat), followed by oxidation and cyclic tests. Increasing Hf/Si content promoted the formation of spinel-type oxides, leading to increased TGO thickness. In contrast, FCT results showed that a small addition significantly improved cyclic lifetime, after which the benefit saturated. Microstructural analysis revealed that Hf/Si was locally distributed in the upper TGO region, enhancing interfacial adhesion between the TGO and top coat. These results demonstrate the competing effects of Hf/Si on oxidation and cyclic durability, and suggest an optimal compositional range for improved TBC performance.

Keywords

Thermal Barrier Coating

Bond Coat

Reactive Element

Thermal Cycling Life

Thermally Grown Oxide

가스터빈 고온 부품의 수명 향상을 위한 열차폐 코팅(Thermal Barrier Coating, TBC)에서 본드 코트 조성 최적화는 핵심 과제로 주목받고 있다. 본 연구에서는 NiCoCrAlY와 NiCoCrAlYHfSi 분말의 혼합비가 1,100°C 등온산화 및 열사이클 성능에 미치는 영향을 분석하였다. CM939 초내열합금 기판 위에 HVOF로 혼합 본드 코트를, APS로 8YSZ 탑 코트를 적층한 후 등온산화(10, 100시간) 및 FCT 시험을 수행하였다. 등온산화 결과 Hf/Si 함량이 증가함에 따라 스피넬계 혼합 산화물 형성이 촉진되었으며, 이에 따라 TGO 두께가 증가하였다. 반면 FCT에서는 소량 첨가 조건(3:1)에서 수명이 47.5% 향상되었으며, 이후 증가 효과는 포화되는 경향을 보였다. Hf/Si는 TGO 상부에 국부적으로 분포함으로써 TGO와 탑 코트 간 계면 접착 특성을 향상하는 것으로 나타났으며, 이는 FCT 수명 증가의 주요한 원인으로 판단된다.

키워드

열차폐 코팅

본드 코트

활성 원소

열사이클 수명

열 성장 산화물

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Information

Publisher :The Korean Society of Propulsion Engineers
Publisher(Ko) :한국추진공학회
Journal Title :Journal of the Korean Society of Propulsion Engineers
Journal Title(Ko) :한국추진공학회지
Volume : 30
No :4
Pages :13-22
Received Date : 2026-02-10
Revised Date : 2026-06-02
Accepted Date : 2026-06-15
DOI :https://doi.org/10.6108/KSPE.2026.30.4.013

Journal of the Korean Society of Propulsion Engineers ISSN:1226-6027(Print) 2288-4548(Online) 한국추진공학회지

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