Tailoring mechanical, microstructural and toughening characteristics of plasma-sprayed graphene-reinforced samarium niobate coatings for extreme environments

IF 2.3 4区工程技术 Q2 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Pub Date : 2024-09-18 DOI:10.1177/09544089241279724

Satyajeet Kumar, Shailesh Mani Pandey

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Abstract

Thermal barrier coatings (TBCs) are advanced ceramic layers applied to metal components to provide insulation and protection against high temperatures in extreme operating environments. This study investigated the effects of graphene nanoplatelet (GNP) reinforcement on samarium niobate (SN: SmNbO4) TBCs for extreme environments. Four ceramic top coat compositions were plasma-sprayed onto Inconel 718 substrates: Yttria-stabilized zirconia (YSZ), SmNbO4 (SN), and SN reinforced with 1 and 1.5 wt% GNPs (SN-1GNP, SN-1.5GNP). The research examined microstructural characteristics, phase evolution, mechanical properties and toughening mechanisms. GNP reinforcement significantly improved coating density, with SN-1.5GNP reaching 97.4 ± 1.64% compared to 91.3 ± 1.69% for SN and 86.6 ± 1.47% for YSZ. Hardness and elastic modulus were enhanced by 86.38% and 57.91% for SN-1GNP, and 101.09% and 65.23% for SN-1.5GNP respectively. Moreover, fracture toughness experienced a significant increase from 1.86 ± 0.4 to 5.48 ± 0.7 MPa·m1/2, facilitated by toughening mechanisms, like splat bridging, GNP pull-out, crack arrest and ferroelastic domain switching. Additionally, the SN-1.5GNP coating exhibited a higher adhesion strength of 36.84 MPa, thereby leading to improved layer distribution and lesser chance of delamination. Compared to YSZ, these findings suggest that GNP-reinforced SN coatings offer enhanced performance for extreme environment applications.

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为极端环境定制等离子喷涂石墨烯增强铌酸钐涂层的机械、微结构和增韧特性

热障涂层（TBC）是一种应用于金属部件的先进陶瓷层，可在极端工作环境中提供隔热和耐高温保护。本研究调查了石墨烯纳米板（GNP）增强对极端环境下铌酸钐（SN：SmNbO4）TBC 的影响。在因科镍合金 718 基材上采用等离子喷涂了四种陶瓷面层成分：它们分别是钇稳定氧化锆（YSZ）、SmNbO4（SN）和添加了 1 和 1.5 wt% GNP 的 SN（SN-1GNP、SN-1.5GNP）。研究考察了微观结构特征、相变、机械性能和增韧机制。GNP 增强明显提高了涂层密度，SN-1.5GNP 的涂层密度达到 97.4 ± 1.64%，而 SN 和 YSZ 的涂层密度分别为 91.3 ± 1.69% 和 86.6 ± 1.47%。SN-1GNP 的硬度和弹性模量分别提高了 86.38% 和 57.91%，SN-1.5GNP 分别提高了 101.09% 和 65.23%。此外，断裂韧性也从 1.86 ± 0.4 MPa-m1/2 显著提高到 5.48 ± 0.7 MPa-m1/2，这得益于溅射桥接、GNP 拔出、裂纹捕捉和铁弹性域切换等增韧机制。此外，SN-1.5GNP 涂层的附着强度更高，达到 36.84 兆帕，从而改善了层分布，降低了分层的几率。与 YSZ 相比，这些研究结果表明，GNP 增强 SN 涂层在极端环境应用中具有更高的性能。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 工程技术-工程：机械

CiteScore

3.80

自引率

16.70%

发文量

370

审稿时长

6 months

期刊介绍： The Journal of Process Mechanical Engineering publishes high-quality, peer-reviewed papers covering a broad area of mechanical engineering activities associated with the design and operation of process equipment.