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Sintering behavior and thermal conductivity of nickel-coated graphite flake/copper composites fabricated by spark plasma sintering
- Source :
- International Journal of Minerals, Metallurgy, and Materials. 25:459-471
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- Nickel-coated graphite flakes/copper (GN/Cu) composites were fabricated by spark plasma sintering with the surface of graphite flakes (GFs) being modified by Ni–P electroless plating. The effects of the phase transition of the amorphous Ni–P plating and of Ni diffusion into the Cu matrix on the densification behavior, interfacial microstructure, and thermal conductivity (TC) of the GN/Cu composites were systematically investigated. The introduction of Ni–P electroless plating efficiently reduced the densification temperature of uncoated GF/Cu composites from 850 to 650°C and slightly increased the TC of the X–Y basal plane of the GF/Cu composites with 20vol%–30vol% graphite flakes. However, when the graphite flake content was greater than 30vol%, the TC of the GF/Cu composites decreased with the introduction of Ni–P plating as a result of the combined effect of the improved heat-transfer interface with the transition layer, P generated at the interface, and the diffusion of Ni into the matrix. Given the effect of the Ni content on the TC of the Cu matrix and on the interface thermal resistance, a modified effective medium approximation model was used to predict the TC of the prepared GF/Cu composites.
- Subjects :
- 010302 applied physics
Materials science
Mechanical Engineering
Metals and Alloys
Spark plasma sintering
Sintering
chemistry.chemical_element
02 engineering and technology
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Copper
Amorphous solid
Nickel
chemistry
Geochemistry and Petrology
Mechanics of Materials
Plating
0103 physical sciences
Materials Chemistry
Graphite
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 1869103X and 16744799
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- International Journal of Minerals, Metallurgy, and Materials
- Accession number :
- edsair.doi...........dbc91648a9a97b0b0536d7960dae63bc