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Preparation and Characterization of Cu Coated SiC Composite Powders by in-situ Chemical Deposition

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Author(s): SHI Jin-Gang, YAO Hui, CHEN Ming-Hai, LIU Ning, LI Qing-Wen

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 8;
Start page: 795;
Date: 2012;
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Keywords: SiC; Cu; ceramic-metal composite; in-situ chemical deposition

ABSTRACT
A facile one-step in-situ chemical deposition method was introduced to synthesize Cu-Coated SiC composite powders, using [Cu(NH3)4]2+ ions as copper source and N2H4·H2O as reductant, respectively. Scanning electronic microscope (SEM), X-Ray diffraction (XRD), Fourier transform infrared spectroscope (FT-IR) and Zeta potential were used to investigate the structure, morphology and composition of the prepared core/shell composite powders. The corresponding formation mechanism was proposed based on the comparative study. It is revealed that the SiO2 film on the surfaces of pre-oxidated SiC particles can effectively enhance the adsorption of [Cu(NH3)4]2+ ions toward the negatively charged surface, which is favorable to the following in-situ reduction by N2H4·H2O around SiC particles. Nearly continuous Cu coating can be formed by changing the reaction process. The concentration of [Cu (NH3)4]2+ ions and reaction temperature affect the reaction rate and coating structure. The process parameters are optimized to obtain the best coating structure with [Cu(NH3)4]2+ ions concentration of 0.2 mol/L and reaction temperature of 70¡䪠respectively.

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