Impact of non-uniform CMAS deposition and penetration on the performance degradation of a film-cooled vane with TBCs under a hot streak condition

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

Surface & Coatings Technology Pub Date : 2025-04-02 DOI:10.1016/j.surfcoat.2025.132118

Li Shi, Changce Wang, Xiao Tan, Siqi Liao, Zhixuan Deng, Rongli Deng, Jiasheng Song

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Abstract

This paper presents a model and computational method to analyze the impact of CMAS deposition and penetration on the aerodynamic performance, cooling efficiency, and stress evolution of a film-cooled turbine vane under a hot streak condition. The results indicate that the insulation effect of the deposit layer enhances the vane's cooling efficiency as it thickens, leading to reduced temperatures within the coating and a decreased CMAS penetration rate. However, CMAS penetration increases the thermal conductivity of the coating, thereby diminishing its insulation effectiveness. After 1500 h of deposition, the CMAS penetration coefficient decreases by 11.8 %, while the thermal conductivity of the top coat (TC) increases by 8.93 %. Cooling efficiency improves by 2.1 % after 1500 h due to deposition, but this effect diminishes to 1.06 % because of CMAS penetration. Additionally, the thermally grown oxide (TGO) increases from 1.0 μm to 1.729 μm after 1500 h, and further to 1.761 μm with CMAS penetration. CMAS penetration results in a maximum stress increase of 34 MPa in the TGO after 1500 h, indicating significant stress accumulation in the TGO, followed by the bond coat (BC) and top coat (TC).

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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.