Study on surface modification of diamond particles and thermal conductivity properties of their reinforced metal-based (Cu or Mg) composites

An innovative molten-salt method is presented for the in-situ reactive preparation of surface-modified diamond particles. Surface-modified diamond particle reinforced metal-based (copper or magnesium) composites were prepared by spark plasma sintering. Field-emission scanning electron microscopy was...

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Bibliographic Details
Published in:Diamond and related materials 2020-10, Vol.108, p.107998, Article 107998
Main Authors: Zhu, Congxu, Cui, Can, Wu, Xiwang, Zhang, Bowen, Yang, Dong, Zhao, Hongxiao, Zheng, Zhi
Format: Article
Language:English
Subjects:
Bonding
Composite materials
Copper
Diamond particles
Diamonds
Emission analysis
Graphitization
Heat conductivity
Heat transfer
Interfacial bonding
Magnesium
Microstructures
Morphology
Particulate composites
Photoelectrons
Plasma sintering
Raman spectroscopy
Spark plasma sintering
Spectrum analysis
Surface modification
Thermal conductivity
Thickness
X-ray spectroscopy
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Summary:An innovative molten-salt method is presented for the in-situ reactive preparation of surface-modified diamond particles. Surface-modified diamond particle reinforced metal-based (copper or magnesium) composites were prepared by spark plasma sintering. Field-emission scanning electron microscopy was used to analyze the surface morphologies of the surface-modified diamond samples and the interfacial bonding of the diamond-metal composite materials. The elemental distributions of the surface-modified diamond particles were analyzed by energy-dispersive X-ray spectroscopy, and X-ray diffraction was used to analyze the phase compositions of the samples. By means of X-ray photoelectron spectroscopy and laser Raman spectroscopy, the surface bonding and graphitization of the surface-modified diamond particles were further analyzed. The results showed that the thickness of the modification layer on the surface of diamond increased gradually with increasing holding time. The surface-modified diamond particle reinforced metal-based composite materials had high thermal conductivities. When the volume percentage of diamond was 35%, the thermal conductivities of the diamond–copper composites were as high as 602 W·m−1·K−1, and the thermal conductivity of the diamond–magnesium composites reached 286 W·m−1·K−1. [Display omitted] •Surface-gradient-modified diamond particles were prepared using a molten-salt method.•The effects of holding time on the phase and microstructure of coating layers were investigated.•The thermal conductivities of the surface-modified diamond-reinforced metal (Cu or Mg) matrix composites were studied.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2020.107998