Experimental study on thermal cycle performance of DD6 single crystal thermal barrier coating with film cooling holes

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-02-11 DOI:10.1016/j.surfcoat.2025.131899

Wenbing Tian, Wenhu Wang, Yifeng Xiong, Yuanbin Wang

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引用次数: 0

Abstract

Film-cooling holes play a critical role in increasing the inlet temperature of aviation gas turbine engines. However, the presence of these cooling holes can lead to local thermal and mechanical stresses during cold-hot cycling and high-temperature gas erosion, resulting in coating spallation along the cooling holes. Moreover, the use of picosecond laser drilling can exacerbate the coating's failure at these damaged locations. This study conducts thermal cycling experiments on DD6 single-crystal thermal barrier coatings with cooling holes, analyzing the effects of hole structure and laser processing on the thermal cycling life, surface morphology, and microstructure of the thermal barrier coatings. The results indicate that the damage and failure of the coatings are less severe for non-conventional holes compared to inclined holes, and the thermal cycling life of non-conventional holes is higher than that of inclined holes. The sharp side of the non-conventional hole exhibits smaller damage area compared to the inclined hole, while the blunt side shows no significant damage. Furthermore, when using a scanning speed of 300 mm/s and a spacing of 0.025 mm, the non-conventional holes demonstrate minimal coating damage and superior thermal cycling performance. Finally, the failure mechanism of thermal barrier coatings is analysed.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.