Adhesion and Thermal Insulation Performance of the Antiseptic Paint on the Surface of Gadolinium Zirconate Thermal Barrier Coating

LI Chun, GAO Xu, GENG Qiong, YANG Zhenxiao, NI Liyong, DU Xinwei, LI Ting, MA Kangzhi, WEN Bo

doi:10.16577/j.issn.1001-1560.2025.0025

2025 , Vol. 58 >Issue 2: 73 - 82

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0025

Adhesion and Thermal Insulation Performance of the Antiseptic Paint on the Surface of Gadolinium Zirconate Thermal Barrier Coating

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(Institute of Aerospace Materials and Processing Technology， Beijing 100076， China)

LI Chun(1993-)， Senior Engineer， Ph.D.， Research Focus: Thermal Spray， Special Functional Coating， Coating Interface Control and Failure Analysis， etc.， Tel.: 010-88531118， E-mail: lichun＠buaa.edu.cn

Received date: 2024-09-02

Revised date: 2024-09-25

Accepted date: 2024-09-26

Online published: 2025-03-20

Supported by

National Natural Science Foundation of China(52371044)

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Abstract

Thermal barrier coatings are commonly sprayed onto the surfaces of hot-end components of aerospace vehicles to enhance the temperature-bearing capacity of metal substrates.After large-scale production， these coatings typically face a storage period of several years.To improve the salt spray resistance， hygrothermal resistance and mold resistance (commonly known as antiseptic properties) of thermal barrier coatings， antiseptic paint could be applied on their surfaces.In this work，the wetting and spreading behaviors of TL-43 antiseptic paint on the surfaces of gadolinium zirconate (GZO) thermal barrier coatings with different micro morphologies were investigated， and the adhesion of the coatings was tested.Meanwhile， the variation pattern and physical essence of the thermal conductivity of the GZO＋TL-43 composite coating during high-temperature thermal exposure were clarified.Results indicated that the GZO coating melted well in the plasma flame and exhibited a typical layered structure.Increasing the spraying distance could significantly reduce the surface roughness of the GZO coating and the number of fine and incompletely-melted particles with a diameter of 1 ～3 μm， thereby decreasing the contact angle of the TL-43 paint on its surface.When the spraying distance was 110 mm，the contact angle of TL-43 on the deposited GZO coating was as low as 37.8°.Under different processes， all of the adhesion of the composite coating was grade 0.The thermal conductivity of the as-prepared GZO-90 with spraying distance of 90 mm after compounding with TL-43 was 0.94 W/(m·K)， suggesting that its thermal insulation performance was weaker than that of the single GZO coating.However， after thermal exposure at 1 100 ℃for 10 min， the thermal conductivities of both the GZO-90 ＋TL-43 composite coating and the single GZO coating became approximately 0.86 W/(m·K).This research not only provides a technological foundation for spraying antiseptic paint on thermal barrier coatings， but also offers a valuable reference for the application of organic coatings on plasma-sprayed coatings， which can provide theoretical support for the structural design of composite coatings.

Key words： gadolinium zirconate; thermal barrier coating; antiseptic paint; adhesion; contact angle; thermal conductivity

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LI Chun, GAO Xu, GENG Qiong, YANG Zhenxiao, NI Liyong, DU Xinwei, LI Ting, MA Kangzhi, WEN Bo . Adhesion and Thermal Insulation Performance of the Antiseptic Paint on the Surface of Gadolinium Zirconate Thermal Barrier Coating[J]. Materials Protection, 2025 , 58(2) : 73 -82 . DOI: 10.16577/j.issn.1001-1560.2025.0025

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