碳纳米管增强飞灰/氧化铝涂层在柴油机活塞热障效应的数值与实验研究

IF 8.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Nagarjuna Chavana, Biswaraj Sarkar and Sudhakar C. Jambagi*, 
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引用次数: 0

摘要

粉煤灰(FA)是煤燃烧产生的工业副产品,在处理方面存在重大挑战,特别是在发展中国家。鉴于其矿物学性质,FA在热喷涂涂料中显示出潜力。本研究通过数值模拟评估了基于fa的活塞涂层改善内燃机热管理的效果,分析了它们对温度分布、热应力和燃烧效率的影响。FA涂层还应用于添加了添加剂(50 wt % Al2O3和0-2 wt % CNT)的海洋级钢,以评估高温性能。微观结构分析表明,2 wt %碳纳米管增强(2CAF)涂层出现团聚现象,与1 wt %碳纳米管增强(1CAF)涂层相比,显微硬度降低了约9.27%。1CAF的XRD分析表明,刚玉向γ-氧化铝转变了~ 56.51%,与氧化铝/FA (AF)涂层相比,导热系数降低了~ 15.40%,而2CAF涂层由于碳纳米管的不均匀性而提高了导电性。对于活塞应用,模拟显示最高表面温度上升~ 24.59%,从241.39°C上升到300.76°C,热流减少~ 62.06%,表明耐用性增强,减少了冷启动排放。热循环表明,1CAF涂层比AF和2CAF涂层更耐用,这表明基于fa的tbc是提高发动机性能和废物增值的可持续且经济的选择。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical and Experimental Investigation of Thermal Barrier Effects of CNT-Reinforced Fly Ash/Alumina Coatings in Diesel Engine Pistons

Numerical and Experimental Investigation of Thermal Barrier Effects of CNT-Reinforced Fly Ash/Alumina Coatings in Diesel Engine Pistons

Numerical and Experimental Investigation of Thermal Barrier Effects of CNT-Reinforced Fly Ash/Alumina Coatings in Diesel Engine Pistons

Fly ash (FA), an industrial byproduct from coal combustion, presents significant disposal challenges, especially in developing nations. Given its mineralogical properties, FA shows potential in thermal spray coatings. This study evaluates FA-based coatings for pistons to improve thermal management in internal combustion engines through numerical simulations, analyzing their effects on the temperature distribution, thermal stress, and combustion efficiency. FA coatings were also applied to marine-grade steel with additives (50 wt % Al2O3 and 0–2 wt % CNT) to assess high-temperature performance. Microstructural analysis revealed that 2 wt % CNT-reinforced (2CAF) coatings showed agglomeration, reducing microhardness by ∼9.27% compared to 1 wt % CNT-reinforced (1CAF) coatings. The XRD analysis of 1CAF indicated ∼56.51% transformation of corundum to γ-alumina, lowering thermal conductivity by ∼15.40% compared to alumina/FA (AF) coatings, while 2CAF coatings showed increased conductivity due to CNT inhomogeneity. For piston applications, simulations showed an ∼24.59% rise in maximum surface temperature, from 241.39 to 300.76 °C, and an ∼62.06% reduction in heat flux, indicating enhanced durability and reduced cold-start emissions. Thermal cycling demonstrated that 1CAF coatings outlasted AF and 2CAF, suggesting FA-based TBCs as sustainable and economical options for enhanced engine performance and waste valorization.

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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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