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Effect of Graphite Flake Size on the Strength and Thermal Conductivity of Graphite Flakes/Al Composites
Liu Xiaoyun1,2; Wang Wenguang2; Wang Dong2; Xiao Bolv2; Ni Dingrui2; Chen Liqing1; Ma Zongyi2
Corresponding AuthorMa Zongyi(zyma@imr.ac.cn)
2017-07-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume53Issue:7Pages:869-878
AbstractGraphite flakes reinforced Al matrix composites (G(f)/Al) with low density, good machining property and high thermal conductivity are considered an excellent heat sink materials used in electronic industry. When the composites are manufactured by liquid method such as liquid infiltration, it is easy to achieve a high thermal conductivity composite. However, the Al4C3 phase would be formed in the composite, which will decrease the corrosion properties of the composites. The powder metallurgy technique could avoid the formation of the Al4C3 phase. In this work, three seized graphite flakes (150, 300, 500 mu m) were used to investigate the effect of the graphite flake size on the strength and thermal conductivity of G(f)/Al alloy composites. The 50% G(f)/Al alloy (volume fraction) composites were fabricated by the powder metallurgy technique. The density of all the three Gf/Al alloy composites were similar to the theoretical density. The graphite flakes had a well bonding with Al alloy matrix without cracks and pores. The (001) G(f) basal plane of the graphite flakes were almost parallel to the circular plane (xy plane) of the composites ingot. However, for the small graphite flakes, their (001) G(f) basal plane was not well parallel to the xy plane of the composite ingot due to the powder metallurgy process. For the large graphite flakes, they exhibited a good orientation in the xy plane of the composite ingot. The strength of the G(f)/Al alloy composites decreased with the increase of the graphite flake size. For the 150 mm graphite flake, the bending strength of the Gf /Al alloy composite was 82 MPa. However, for the 500 mm graphite flake, the bending strength of the composite decreased to 39 MPa. Due to the low strength between the layers of the graphite flake, the cracks were prone to expand in the graphite flake. As the size of the graphite flake increased, this phenomenon became more obviously. It is easy to observe that the graphite flakes peeled off on the fracture surfaces. When the size of the graphite flake increased from 150 mm to 500 mm, the thermal conductivity increased by 63%. The highest thermal conductivity was 604 W/(m . K). The interfacial thermal conductance (h(c)) of the composites were calculated by the Maxwell-Garnett type effective medium approximation model. The hc of 300 and 500 mm graphite flake G(f)/Al alloy composites were slightly lower than the theoretical value (calculated by the acoustic mismatch model). However, the hc of the 150 mm graphite flake G(f) /Al alloy composite was lower than that of the theoretical value. Besides the size of the graphite flakes, the shape, distribution and defect of the graphite flakes also influenced the thermal conductivity of the composites.
Keywordgraphite flake aluminum matrix composite thermal conductivity mechanical property
Funding OrganizationNational Natural Science Foundation of China
DOI10.11900/0412.1961.2017.00015
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[U1508216] ; National Natural Science Foundation of China[51271051]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000408285400012
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/125015
Collection中国科学院金属研究所
Corresponding AuthorMa Zongyi
Affiliation1.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110016, Liaoning, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Liu Xiaoyun,Wang Wenguang,Wang Dong,et al. Effect of Graphite Flake Size on the Strength and Thermal Conductivity of Graphite Flakes/Al Composites[J]. ACTA METALLURGICA SINICA,2017,53(7):869-878.
APA Liu Xiaoyun.,Wang Wenguang.,Wang Dong.,Xiao Bolv.,Ni Dingrui.,...&Ma Zongyi.(2017).Effect of Graphite Flake Size on the Strength and Thermal Conductivity of Graphite Flakes/Al Composites.ACTA METALLURGICA SINICA,53(7),869-878.
MLA Liu Xiaoyun,et al."Effect of Graphite Flake Size on the Strength and Thermal Conductivity of Graphite Flakes/Al Composites".ACTA METALLURGICA SINICA 53.7(2017):869-878.
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