Effect of high-repetition frequency nanosecond laser remelting on microstructure and oxidation properties of low-pressure plasma sprayed NiCoCrAlYTa coating
Qianru Jia , Xiangcheng Li , Wei Qian , Yinqun Hua , Xiaofeng Zhang , Jinzhong Lu , Jie Cai
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引用次数: 0
Abstract
MCrAlYX coatings are widely utilized as bond coat in thermal barrier coating systems. This study employs high-repetition frequency nanosecond laser remelting (HRF-NLR) to enhance the resistance to high-temperature oxidation of NiCoCrAlYTa coatings prepared via low-pressure plasma spraying (LPPS). The objective of this study is to investigate how laser remelting influences the microstructural evolution of the NiCoCrAlYTa coating and the growth characteristics of the thermally grown oxide (TGO). Various scanning speeds and laser pulse energy densities were employed to investigate the microstates of the molten pool and the polishing mechanisms of the samples after HRF-NLR. Increasing the repetition frequency effectively mitigates the ablation issues typically associated with conventional laser remelting, while also enabling precise control over depth of the remelted coating. Microstructure analysis shows that the original rough surface was remelted and polished, contributing to a significant reduction in surface roughness, noticeable grain refinement, a high density of dislocations, and the redistribution of active elements within the modified coating. Oxidation results at 1150 °C reveal that the HRR-NLR coating can induce the formation of a dense, continuous, and slow-growing single α-Al2O3 film, demonstrating that HRF-NLR is an efficient and feasible method for improving the resistance of MCrAlYX coatings to high-temperature oxidation.
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.
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