Interfacial characteristics of diamond/aluminum composites with high thermal conductivity fabricated by squeeze-casting method

Jiang, Longtao; Wang, Pingping; Xiu, Ziyang; Chen, Guoqin; Lin, Xiu; Dai, Chen; Wu, Guanglei

doi:10.1016/j.matchar.2015.06.023

Cited by 32 publications

(4 citation statements)

References 31 publications

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“…The thickness of this layer is ∼2.5 nm, and the SAED pattern (inset) indicates its amorphous behavior. The similar amorphous interfacial layer is also reported by several investigators in the previous studies [41][42][43][44][45]. Beffort et al [42] found that this interfacial layer is composed of Al, C and O. Huang et al [45] reported that the generation of this firmly adhered amorphous layer at Al/graphite interface is due to the catalyzation of the reconstructed graphite film surface by the Al element.…”

Section: Interfacial Bonding and Tem Observationsupporting

confidence: 77%

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: Interfacial Bonding and Tem Observationsupporting

confidence: 77%

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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“…Recently, diamond reinforced aluminum or aluminum alloy composites have been proposed as candidate materials for above applications. However, the natural de-bonding between aluminum and the hexagonal diamond surfaces (with (1 1 1) orientations) is not conducive to obtain a strong interfacial bonding for the transfer of stress and heat 17 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced bending strength and thermal conductivity in diamond/Al composites with B4C coating

Sun

Zhang

et al. 2018

Sci Rep

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Diamond/Al composites containing B4C-coated and uncoated diamond particles were prepared by powder metallurgy. The microstructure, bending strength and thermal conductivity were characterized considering the B4C addition and diamond fraction. The influence of B4C coating and fraction of diamond on both bending strength and thermal conductivity were investigated. The bending strength increased with decreasing diamond fraction. Moreover, addition of B4C coating led to an obvious increase in bending strength. The peak value at 261.2 MPa was achieved in the composite with 30 vt.% B4C-coated diamond particles, which was about twice of that for 30 vt.% uncoated diamond/Al composite (140.1 MPa). The thermal conductivity enhanced with the increase in diamond fraction, and the highest value (352.7 W/m·K) was obtained in the composite with 50 vt.% B4C-coated diamond particles. Plating B4C on diamond gave rise to the enhancement in bending strength and thermal conductivity for diamond/Al composites, because of the improvement of the interfacial bonding between diamond and aluminum matrix.

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“…The in-plane ultimate maximum TC of graphite is approximately 2000 W/(m•K) [17,18]. The 3D diamond, the hardest matrials in nature, are considered perfect thremal and mechanical reinforcements with TC in a range from 1200 to 2000 W/(m•K) [19,20].…”

Section: Introductionmentioning

confidence: 99%

High Thermal Conductivity and Anisotropy Values of Aligned Graphite Flakes/Copper Foil Composites

Zeng

Xue

et al. 2019

Materials

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Much attention has been paid to graphite flakes/copper (GFs/Cu) composites for thermal management due to their remarkable thermal properties. Most studies focus on the interface interaction between GFs and Cu in composites. However, controlling the orientation of GFs still remains a challenge. Herein, we report a reliable method to ensure consistent orientation of GFs in the composites. Firstly, the disorder GFs were well arranged on the surface of copper foil by tape casting process in the casting machine. Then highly aligned GFs/Cu composites were fabricated by hot pressing process in a vacuum hot-pressing furnace, with the volume fraction of graphite from 30% to 70%. The SEM images show that the obtained GFs/Cu composites presented a layer-by-layer structure or network structure with a different content of GFs. The thermal conductivity of GFs/Cu composites exhibited an extreme anisotropy due to the highly aligned GFs. The ultrahigh thermal conductivity of GFs/Cu composites with 70 vol% GFs reached 741 W/(m·K), while through-plane thermal conductivity was just 42 W/(m·K). The alignment of GFs and interfacial thermal resistance were deeply analyzed and a thermal conductivity model for GFs/Cu composites was established. Our work provides a new idea to significantly enhance the thermal transportation performance of GFs/Cu composites by well controlled alignment of GFs in Cu matrix.

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Interfacial characteristics of diamond/aluminum composites with high thermal conductivity fabricated by squeeze-casting method

Cited by 32 publications

References 31 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

Enhanced bending strength and thermal conductivity in diamond/Al composites with B4C coating

High Thermal Conductivity and Anisotropy Values of Aligned Graphite Flakes/Copper Foil Composites

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