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Boron carbide due to properties such as high hardness, high Young's modulus and low density is highly regarded; however its application is limited because of unsuitable sinterability, low fracture toughness and the low wettability of it with melt of most metals. In this study, the surface of B₄C is coated with electroless method and the effect of ethylene diamine (C₂H₈N₂) complexing agent at temperatures of 75 and 85 °C and a pH of 13 is examined. Scanning electron microscope equipped with EDS analyzer for investigation of microstructure and morphology of coated B₄C powder and X-ray diffraction to determine the composition and phases were used. The results indicate that in the electroless coating process, the amount of the C₂H₈N₂ complexing agent in the plating bath has significant effect on the quantity of coating and uniformity of it on the surface of the B₄C particles. By increasing the C₂H₈N₂ complexing agent in the electroless plating bath in each of the constant temperatures of 75 and 85 °C, the nickel coating is reduced. The phase analysis of coated B₄C particles in the electroless nickel plating bath with different amounts of the C₂H₈N₂ complexing agent as compared to nickel salt at a temperature of 85 °C showed that in all four composition of complexing agent, B₄C and Ni phases are present. However, in ratios of 1: 1 and 1: 3 of C₂H₈N₂ complexing agent to nickel salt, Ni(OH)₂ phase is also visible.

Keywords: B4C, complexing agent, nickel-boron electroless

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