Electro-thermal and mechanical property analysis of powder metallurgy processed, multi-stage ball milled aluminium-copper-multi walled carbon nanotube composite

Engineering Research Express Pub Date : 2024-06-14 DOI:10.1088/2631-8695/ad58a4

Subham Kundu, S. Mondal

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Abstract

Abstract Aluminium Metal Matrix Composite (Al-MMC) is a favourable option for industries like automotive, aerospace, sports equipment, electronic packaging and renewable energy because of its impressive strength-to-weight ratio, effective thermal and electrical conductivity, abundant availability and reasonable cost of aluminium. Carbon nanotube (CNT) reinforced Al-MMC is popular among researchers due to its impressive strength and stiffness. The electrical and thermal conductivity of Al-CNT is a less focused field with challenges like uniform dispersion and structural integrity of CNT depending on the manufacturing process. In this paper, a novel method of Multistage ball milling (MSBM) was introduced to develop a powder metallurgy processed Al-MMC, consisting of 5-weight percentage (5 wt. %) of copper (Cu) and 0.5 to 1.5 volume percentage (0.5-1.5 vol. %) multi-walled carbon nanotubes (MWCNT). In MSBM, mixing was done in two stages with two different rpms of the ball mill to add the advantages of flake powder metallurgy with lower chances of structural damage and the agglomeration of CNT. Mechanical, electrical, thermal, and microstructure characteristics of the fixed-speed single-stage ball milling (SSBM) process and the MSBM were compared. MSBM-processed Al-5Cu-0.5CNT composites showed higher electrical conductivity (15.03%), thermal conductivity (5.88%) and hardness (9.68%) than SSBM-processed composites. Al-5Cu-0.5CNT developed by the MSBM process achieved superior electrical and thermal conductivity, surpassing pure sintered Al by 138.45% and 9.39%, respectively. Keywords: Aluminum Metal Matrix Composite, Multistage ball milling, Al-5Cu-1.5 CNT, Powder metallurgy

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粉末冶金加工、多级球磨铝铜多壁碳纳米管复合材料的电热和机械性能分析

摘要铝金属基复合材料（Al-MMC）因其出色的强度-重量比、有效的导热性和导电性、丰富的可用性和合理的铝成本，成为汽车、航空航天、运动器材、电子包装和可再生能源等行业的有利选择。碳纳米管（CNT）增强的 Al-MMC 因其出色的强度和刚度而受到研究人员的青睐。铝-碳纳米管的导电性和导热性是一个不太受关注的领域，其挑战包括碳纳米管的均匀分散和结构完整性取决于制造工艺。本文介绍了一种新型的多级球磨（MSBM）方法，用于开发粉末冶金加工的 Al-MMC，由 5 重量百分比（5 wt.%）的铜（Cu）和 0.5 至 1.5 体积百分比（0.5-1.5 vol.%）的多壁碳纳米管（MWCNT）组成。在 MSBM 中，使用两种不同转速的球磨机分两个阶段进行混合，以增加片状粉末冶金的优势，同时降低结构损坏和 CNT 凝聚的几率。比较了固定转速单级球磨（SSBM）工艺和 MSBM 工艺的机械、电气、热和微观结构特征。与 SSBM 工艺相比，MSBM 工艺加工的 Al-5Cu-0.5CNT 复合材料的导电率（15.03%）、导热率（5.88%）和硬度（9.68%）都更高。采用 MSBM 工艺制备的 Al-5Cu-0.5CNT 复合材料具有优异的导电性和导热性，分别比纯烧结铝高出 138.45% 和 9.39%。关键词铝金属基复合材料多级球磨 Al-5Cu-1.5 CNT 粉末冶金

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Engineering Research Express

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