Study on Microstructure and Mechanical Properties of Ni-Mo-BN Plated Composite Layer Before and After Heat Treatment
Ni-Mo-BN composite layers with different BN contents were prepared on the surface of copper substrate by direct current electrodeposition.The effect of BN powder at different concentrations(5 g/L,10 g/L,15 g/L,20 g/L)in the plating solution and the influence of BN on the microstructure and hardness of the film layer after annealing heat treatment were investigated.The results show that the best overall performance is obtained with a current density of 2 A/dm2 and a BN addition of 10 g/L for 15 min.As the BN powder content in the plating solution increases,the BN content in the plated layer firstly increases and then decreases.When BN powder is added at 10 g/L,the most BN can be deposited on the surface of the substrate,and the grain size is smaller at this time,which can improve the performance of the film layer significantly.The film hardness is positively correlated with the amount of BN in the film layer.However,when the BN content added to the plating solution is too high,BN produces agglomeration phenomenon,which not only makes the BN deposition rate lower,but also makes the grain size increase,which makes the mechanical properties of the film layer decrease.In addition,by subjecting the specimen to a 600℃annealing heat treatment,the mechanical properties such as hardness and wear resistance of the plated layer can be greatly enhanced.
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