Composite platings of Ni/ceramic particles with high anti-wear resistance

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Composite platings of Ni/ceramic particles were prepared by electrodeposition of nickel from a Watts bath containing diamond particles dispersed using a redox active cationic surfactant containing an azobenzene group (AZTAB). Three kinds of the ceramic particles (silicon carbite, diamond, and cubic boron nitride) were studied. At the optimum condition, the maximum volume percentage of the silicon carbite and diamond particles in the nickel matrix were approximately 60% from the nickel bath bath containing AZTAB. These high content were ascribed to the reduction of the AZTAB which leads to deposition of the particles by desorption of the AZTAB adsorbed on the particles. As a result, deposition of these particles at the cathode surface takes place before these particles are being entrapped in the layer of growing nickel. This value using the AZTAB decreased with increasing the size of the diamond particles. The hardness and wear resistance of the plating increased with increasing the content of the particles in the plating. The value of the highest hardness of the plating was approximately 1,000 HV.