Research Progress in Preparation and Development of Excellent Bond Coats for Advanced Thermal Barrier Coatings

doi:10.11902/1005.4537.2019.154

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (5): 395-403 DOI: 10.11902/1005.4537.2019.154

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Research Progress in Preparation and Development of Excellent Bond Coats for Advanced Thermal Barrier Coatings

YU Chuntang¹,YANG Yingfei²,BAO Zebin¹(

),ZHU Shenglong¹

1. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Institute of Advanced Wear & Corrosion Resistant and Functional Material, Jinan University, Guangzhou 510632, China

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Abstract

Thermal barrier coatings (TBCs) are widely used in hot section of gas turbine engines, holding excellent protection properties at high temperature, with the goal of improving engine efficiency and reducing the operation cost. Generally, a typical TBC is composed of a ceramic topcoat and an oxidation-resistant bond coat, while, the oxidation performance of the bond coat directly determines the overall performance and lifetime of the whole TBC. Thus, the challenge of TBCs operating at higher temperature and harsher environments has attracted the relevant researchers to develop advanced bond coats. Pt-modified aluminide coatings, possessing excellent oxidation resistance, are capable of forming a continuously dense Al₂O₃ scale with low tendency of spallation during exposure at elevated temperature. In the present paper, special attention is devoted to review the development and status of Pt- modified bond coats, including MCrAlY and nickel aluminides, as well as the merits and deficiency of such coatings have been elucidated. At last, the perspectives of manufacturing an advanced bond coat and the development trend are summarized.

Key words: thermal barrier coating MCrAlY Pt-modified aluminide coating reactive element

Received: 12 September 2019

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51301184)

Corresponding Authors: Zebin BAO E-mail: zbbao@imr.ac.cn

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YU Chuntang,YANG Yingfei,BAO Zebin,ZHU Shenglong. Research Progress in Preparation and Development of Excellent Bond Coats for Advanced Thermal Barrier Coatings. Journal of Chinese Society for Corrosion and protection, 2019, 39(5): 395-403.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.154 OR https://www.jcscp.org/EN/Y2019/V39/I5/395

Fig.1 Schematic drawing of preparation of the modified NiCoCrAlY bond coatings^[18]

Fig.4 Cross-section morphologies of 4YSZ TBCs with Pt-free (a) and Pt-modified (b) NiCoCrAlY bond coats after 1000 cycles of thermal exposure at 1100 ℃^[19]

Fig.2 Mass change curves of the three coatings during cyclic oxidation at 1000 ℃ (a) and XRD patterns after cyclic oxidation at 1000 ℃ for 500 cycles (b)^[18]

Fig.3 Element distribution (by EPMA) (a) and mass change curves (b) of NiCoCrAlY/Pt-modified NiCoCrAlY

Fig.5 Ni-Pt-Al ternary phase diagram and cyclic oxidation mass gain of β-(Ni, Pt) Al and γ/γ' for 1100 ℃^[20]

Fig.6 Mass gain and square of mass gain curves of the acidic/basic (Ni, Pt)Al coatings during isothermal oxidation test at 1100 °C^[21]

Fig.7 Surface morphologies of acidic (a, b) and basic (c, d) (Ni, Pt)Al coatings after isothermal oxidation test at 1100 °C for 300 h^[21]

Fig.8 Surface morphologies of acidic (Ni, Pt)Al coating after cyclic oxidation at 1100 °C for 300 cycles (a) in which the amplified image shows void formation at grainboundary junctures (b)^[21]

Fig.9 ToF-SIMS analyses of acidic (a) and basic (b) (Ni, Pt)Al coatings after thermal exposure at 1100 ℃ for 20 h^[21]

Fig.10 Mass gain (a) and square of mass gain (b) versus the oxidation time, where the inserted histogram shows the comparison result of the oxidation rate constant (K_p) for the (Ni, Pt)Al and Hf-doped (Ni, Pt)Al coating samples during isothermal oxidation at 1100 ℃^[23]

Fig.11 Cross-sectional morphologies of (Ni, Pt)Al (a) and Hf-doped (Ni, Pt)Al (b) coating samples after the isothermal oxidation test at 1100 ℃ for 300 h^[23]

Fig.12 Surface morphologies of (Ni, Pt)Al (a) and Hf-doped (Ni, Pt)Al (b) coating samples after the isothermal oxidation test at 1100 ℃ for 20 h^[23]

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