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Wear which results in serious waste of material and energy, has been a very important cause for the destroy of mechanical equipment. So the research on the friction-reduction and wear-resistance during the service life of mechanical equipment is of great social and economical benefit. And the surface treatment technology is an effective approach to get expected goals.Based on conventional electroless plating, electroless composite plating was developed as a new surface treatment technology by adding particles to obtain composite coatings with excellent performances. As a kind of excellent surface treatment technology with simple techniques, homogeneous and fine coatings, electroless composite plating has been widely studied. In this paper, electroless composite coatings, the performances of which are excellent, compounded with micro-sized diamond, black powder or nano-particles of explosive detonation diamond are obtained.Firstly, the effect of electroless plating bath, sort of diamond particle, concentration of diamond particle, surfactant and its concentration, and heat treatment parameter on the properties of coatings was studied on the whole. And it was found that the effect of sort of electroless plating bath was very little. After choosing the electroless plating bath, the influence of concentration of diamond particle, surfactant and its concentration, and heat treatment temperature on the properties of these three kinds of electroless Ni-P-diamond composite coatings were studied group by group by orthogonal experiment design method. And the distribution of diamond particles in the coating, microstructure, microhardness, friction coefficient, wear resistance, etc. of the coating were analyzed by SEM, XRD and other instruments.Based on the experimental results and analysis, the following conclusions have been drawn.1. The optimal parameters for the electroless composite plating of micro-sized diamond are: the concentration of diamond being 2g/L, the heat treatment temperature being 400℃, and not adding any surfactant.2. The optimal parameters for the electroless composite plating of explosive detonation nanodiamond are: adding SHP, and its mass ratio to nanodiamond being 1:20, the concentration of nanodiamond being 4g/L, and the heat treatment temperature being 400℃.3. The optimal parameters for the electroless composite plating of black powder are: the concentration of diamond black powder being 8g/L, the heat treatment temperature being 360℃, and not adding any surfactant.Moreover, according to the comparison among the different coatings, it is found that the electroless composite coating compounded with black powder has the best comprehensive properties.
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