Investigation into thermal expansion coefficient, thermal conductivity and thermal stability of Al-graphite composite prepared by powder metallurgy

Esmati, M.; Sharifi, Hassan; Raeissi, Mehdi; Atrian, Amir; Rajaee, Ali

doi:10.1016/j.jallcom.2018.09.225

Cited by 33 publications

(5 citation statements)

References 26 publications

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“…The larger flakes size behaves as an obstruction in the consolidation of the composite. Thus larger compaction pressure is required in case of large flakes size for having the compaction properties similar to the smaller flakes size [25]. The clustered graphite flakes in the form of bird nest structures can also be visualized form the EDS dot elemental mapping shown in figures 4(e) and (f).…”

Section: Results and Analysismentioning

confidence: 99%

Surface alteration of aluminium alloy by an exfoliated graphitic tribolayer during friction surfacing using a consumable graphite rich tool

Sharma

Tripathi

Narsimhachary

et al. 2019

Surf. Topogr.: Metrol. Prop.

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In present study, a strategy for mechanical exfoliation of graphite to a few layered graphene (FLG) coupled with its mechanical infusion onto aluminium (Al6061) substrate through a solid-state friction surfacing (FS) methodology is developed and documented. Here, a graphite-rich and expendable FS tool fabricated through conventional powder metallurgy is used as a source of graphite. Later on, this expendable tool is utilized for impregnating graphite on the aluminium alloy surface through FS. The high frictional shear stress during FS results in the exfoliation of graphite to FLG which is confirmed by the characteristic wrinkled morphology through FE-SEM studies. Experimental results revealed successful impregnation of FLG flakes up to ∼165 μm depth on the surface of aluminium matrix. The effect of graphite flake size (60 mesh (max. 250 μm) and 325 mesh (max. 44 μm)) on specific wear rate and its ability to mechanically exfoliate into a FLG structure is also analysed. Dynamic recrystallization due to plastic deformation during FS results in∼90% grain size reduction relative to the as-received aluminium alloy (reference Al). Excellent interfacial bonding with mechanical intercalation between graphite flake and aluminium matrix is also observed through TEM studies. Intermetallic phase such as Al 4 C 3 is observed at the Al/graphite interface with larger flake size. The tribological properties are significantly improved with the graphite reinforcement leading to the decrease in coefficient of friction by ∼12.5 and 26.7% with graphite of 250 (FS250) and 44 μm (FS44) flake size respectively as compared to the reference Al. The least specific wear rate is observed for FS44 which is about ∼53.4 % and∼28.57 % less than the wear rate of reference Al and FS250, respectively. The microhardness, nano-hardness and XRD studies further corroborate the results.

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Section: Results and Analysismentioning

confidence: 99%

Surface alteration of aluminium alloy by an exfoliated graphitic tribolayer during friction surfacing using a consumable graphite rich tool

Sharma

Tripathi

Narsimhachary

et al. 2019

Surf. Topogr.: Metrol. Prop.

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“…The thermal insulating properties of specimens were defined by the calculation of thermal conductivity coefficient (k), using Equation 1. 25,26…”

Section: Methodsmentioning

confidence: 99%

Investigation of mechanical and thermal insulating properties of wool fibres in epoxy composites

Semitekolos

Pardou

Georgiou

et al. 2020

Polymers and Polymer Composites

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The purpose of this study is to investigate a novel exploitation approach for a mass livestock byproduct, namely sheep wool fibres. In order to fulfil this aim, wool fibre toughened epoxy composites with an amount of 2.4, 4.1 and 5.7 phr were prepared via the hot press method. Initially, mechanical assessment of the composites was executed, in order to evaluate their mechanical integrity. The flexural and shear strength tests showed that the wool fibre-epoxy composites maintain their mechanical properties for up to 4.1 phr and no degradation is detected. Subsequently, the thermal properties were tested. Thermogravimetric analysis proved that adding wool fibres as toughening agent in epoxy matrix can prolong the endurance of the material while reaching high temperatures. The coefficient of thermal conductivity decreased by 30% compared to neat epoxy, something that is also confirmed through simulation, proving that wool fibre-epoxy composites can be considered as a promising insulating material, while exploiting a natural waste.

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“…however, this increase shows a nonlinear trend. Esmati et al [3] considered the effect of anisotropy of the reinforcing phase on the CTE of al-graphite composites. Since the CTE of graphene in the a-axis and c-axis directions is -0.5 and 28 K -1 , respec-tively.…”

Section: Introductionmentioning

confidence: 99%

A Modified Kerner Model to Predict the Thermal Expansion Coefficient of Multi-Phase Reinforced Composites Al6092/SiC/LAS

Zhang,

Hou,

Jiang

2023

Archives of Metallurgy and Materials

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A Modified Kerner Model to Predict the therMAl exPAnsion coefficient of Multi-PhAse reinforced coMPosites Al6092/sic/lAs in this work, a new supplementary formula was introduced to modify the Kerner model. This supplementary formula enable the Kerner model to predict the thermal expansion coefficient of multi-phase reinforced composites by normalization of the thermal expansion coefficient, bulk modulus, and shear modulus of the reinforcements. For comparison, the modified Kerner model as well as modified Schapery, the rule of mixtures, and Turner models were used to predict the thermal expansion coefficient of multi-phase reinforced composites 6092 Aluminum Alloy/silicon carbide/β-eucryptite. The results confirm the robustness of the modified Kerner model for predicting the thermal expansion coefficient of composites with multi-phase near-spherical inclusions. it may provide a fine selection to predict the thermal expansion coefficient of multi-phase reinforced metal matrix composites which cannot predict efficiently before.

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Investigation into thermal expansion coefficient, thermal conductivity and thermal stability of Al-graphite composite prepared by powder metallurgy

Cited by 33 publications

References 26 publications

Surface alteration of aluminium alloy by an exfoliated graphitic tribolayer during friction surfacing using a consumable graphite rich tool

Surface alteration of aluminium alloy by an exfoliated graphitic tribolayer during friction surfacing using a consumable graphite rich tool

Investigation of mechanical and thermal insulating properties of wool fibres in epoxy composites

A Modified Kerner Model to Predict the Thermal Expansion Coefficient of Multi-Phase Reinforced Composites Al6092/SiC/LAS

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