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In this study the effect of time on coating of SiC powder by electroless nickel-boron process at three temperatures of 75, 85 and 95 °C has been investigated. To study the microstructure and morphology of coated SiC powder, a scanning electron microscope equipped with an EDS analyzer was used and to determine the composition and phases of coated SiC powder, the X-ray diffraction device was used. The time and temperature of the electroless plating bath have a great influence on the amount of coating and its uniformity on the surface of SiC particles. The results show that the highest amount of nickel-boron coating on the surface of SiC particles was obtained at 45 min and 95 °C. However, the most uniform coating has been obtained at 30 min and 85 °C. Phase analysis of coated SiC samples also indicates that at the time of 30 min of electroless plating at all three temperatures of 75, 85 and 95 °C, the Ni phase also appears on the surface of the SiC particles in addition to the SiC phase and by increasing of the temperature, the intensity of Ni peaks increased.

Keywords: Nickel - Boron, coating, SiC powder, electroless, plating time.

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