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Advances in Materials Science and Engineering
Volume 2015, Article ID 351780, 8 pages
http://dx.doi.org/10.1155/2015/351780
Research Article

The Microstructure and Thermal Conductivity of Pressureless Infiltrated Composites Containing Electroless Nickel Platings

1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Received 22 March 2015; Revised 4 June 2015; Accepted 7 June 2015

Academic Editor: Jainagesh A. Sekhar

Copyright © 2015 Aihua Zou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A nickel (Ni) coating was deposited on the surface of silicon carbide particles () through electroless plating and we characterized the morphology and phase structure of the coating and the pressureless infiltrated composites. The effect of Ni coatings on the thermal conductivity of the composites was examined and analyzed with three-dimensional video microscope, scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction microscope (XRD), and finite-element. The results show that a continuous and uniform coating with a certain thickness (around 3.5 μm) can be formed on the surface of . With the addition of the Ni layer, there are some intermetallics Ni3Al but no interfacial carbide Al4C3, which improves the wettability and the thermal conductivity of the composites. The experiments and simulations both show that Ni coatings do not substantially decrease the overall thermal conductivity of the composite, although the thermal conductivity of Ni itself is lower than Al and SiC by a factor of 1.