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Diamond/aluminum composites processed by vacuum hot pressing: Microstructure characteristics and thermal properties

As promising thermal management materials, diamond/Al composites with 20–50vol.% diamond were fabricated by a simple powder metallurgy method called vacuum hot pressing (VHP). The microstructure characteristics and thermal properties of the composites were studied. The results reveal that no aluminu...

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Published in:Diamond and related materials 2013-01, Vol.31, p.1-5
Main Authors: Tan, Zhanqiu, Li, Zhiqiang, Fan, Genlian, Kai, Xizhou, Ji, Gang, Zhang, Lanting, Zhang, Di
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Language:English
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cited_by cdi_FETCH-LOGICAL-c509t-170641d297471d9415f297eed590aa4da1da291b5edb1a2e57ea7a382b3645db3
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container_title Diamond and related materials
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creator Tan, Zhanqiu
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description As promising thermal management materials, diamond/Al composites with 20–50vol.% diamond were fabricated by a simple powder metallurgy method called vacuum hot pressing (VHP). The microstructure characteristics and thermal properties of the composites were studied. The results reveal that no aluminum carbide is formed at the interface and the VHP composite with 50vol.% diamond exhibits a thermal conductivity of 496W/mK, over 85% of the theoretical prediction by the differential effective medium (DEM) scheme, due to good interfacial bonding and high interface conductance. As a comparison, the composites consolidated by spark plasma sintering (SPS) exhibits lower thermal conductivity due to poor interfacial bonding. Thus, VHP is proved to be a more favorable way than SPS to fabricate diamond/Al composites with high thermal properties for heat management applications. ► A novel vacuum hot pressing process developed to consolidate diamond/Al composites. ► Compare the microstructure characteristics and thermal properties of the composites prepared by SPS and by VHP. ► Discuss the possible mechanisms of the variations of interfacial bonding and interface conductance formed by SPS and VHP. ► Enhanced thermal conductivity via improving interface conductance of the composites.
doi_str_mv 10.1016/j.diamond.2012.10.008
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subjects Aluminum
Bonding
Chemical Sciences
Condensed Matter
Cross-disciplinary physics: materials science
rheology
Diamond/Al composites
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Heat transfer
Hot pressing
Interfacial bonding
Material chemistry
Materials Science
Microstructure
Physics
Spark plasma sintering
Specific materials
Thermal conductivity
Thermal properties
Vacuum hot pressing
title Diamond/aluminum composites processed by vacuum hot pressing: Microstructure characteristics and thermal properties
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