Structural evolution of ultra-thick MoSi2 protective coatings on the surface of TZC alloy at high temperatures

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

Surface & Coatings Technology Pub Date : 2025-03-01 DOI:10.1016/j.surfcoat.2025.131995

Yanhong Zhuang , Ruixiong Zhai , Taihong Huang , Jinghong Du , Yantong Man , Zijie Yang , Rui Zhou , Jie Yu , Peng Song

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引用次数: 0

Abstract

Different thicknesses of MoSi₂ coatings were deposited on TZC alloy by atmospheric plasma spraying (APS). The microstructure and oxidation behavior of the coatings at 1300 °C and 1500 °C were studied. When MoSi₂ coatings were oxidized in air at high temperatures, the outward diffused Si formed SiO₂ on the MoSi₂ layer. Also, due to the inward diffusion of Si, the Mo₅Si₃ phase was formed between the MoSi₂ coating and the substrate. The oxidation behavior was controlled by micromorphology and residual stress as coating thicknesses varied. The MoSi₂ coatings exhibit good oxidation resistance, but the thickest coating (1352 μm) presents more cracks in the SiO₂ scale and reduces the oxidation resistance. The cracks on the oxide layer of the ultra-thick coating provide more pathways for oxygen diffusion, gradually rendering the protective effect of the coating on the substrate ineffective. We explain the evolution of the crack initiation and surface morphology of the protective SiO₂ scale based on the residual stress (mainly growth stress) and SiO₂ viscosity.

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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.