Ni - P - Diamond - Molybdenum Disulfide Chemical Composite Plating

The electroless composite plating is a technology slowly developed on the basis of plating. Wecan get a certain performance composite coating by adding inert solid particles to chemical bath anddepositing them together with the matrix metal. The electroless composite plating has already gotextensive application with advantage of low costs, simple craft, the symmetrical thickness of coatingand even can plate largely etc.In order to get the Ni-P-diamond-molybdenum disulfide composite coating with good wear andfriction properties in the dissertation, we study the dispersion in the bath and distribution in thecoating properties of molybdenum disulfide particles; study the influence of the diamond content,molybdenum disulfide content, surfactant type and concentration, heat treatment temperature on thecomposite coating morphology, deposition rate, hardness, friction coefficient, wear resistance by theorthogonal experimental; comparative study the composite coating morphology, hardness, frictioncoefficient, wear resistance and other indicators of the Ni-P coating, diamond micron compositecoating, micron molybdenum disulfide composite coating and Ni-P-diamond-molybdenum disulfidecomposite coating. The main research work and achievements are as follows:(1) The effect of dispersion of molybdenum disulfide slightly deteriorated by the surfactantscontent (1:10,1:20,1:30,1:40,1:50) changes; the effect of dispersion of molybdenum disulfidedeteriorated in the order of PEG, SHP, OP-10, SDBS, CTAB, but the difference is smaller; The effectof distribution in the coating of molybdenum disulfide deteriorated by the order of CTAB, PEG,OP-10, SHP, SDBS; joint use of surfactants than the single surfactant will enhance the effect of thedistribution of the molybdenum disulfide particles in the composite coating.(2) The optimum crafts to each performance of the Ni-P-diamond-molybdenum disulfidecomposite coating are different. The degree of influence of various factors on the deposition rate,hardness, friction coefficient, wear resistance and microstructure of the Ni-P-diamond-molybdenumdisulfide composite coating is different, and the optimal level of each factor are different.(3) Ni-P electroless plating surface is smooth, the surfaces of diamond or molybdenum disulfidecomposite coating are rough and uneven. With the heat treatment temperature increased, the hardnessof various types of composite coatings is firstly increased and then decreased, but the hardness ofthem is significantly different. In the same friction and wear conditions, the wear resistance of the fourcomposite coating from good to poor are micron diamond composite coating, Ni-P chemical coating, Ni-P-diamond-molybdenum disulfide composite coating and composite coating micron molybdenumdisulfide; antifriction properties of the four composite coating from best to worst are micronmolybdenum disulfide composite coating, Ni-P-diamond-molybdenum disulfide composite coating,micron diamond composite coating, Ni-P chemical coatings.