Abstract
Nickel-based diamond composites were produced by electrodepositing in supercritical fluids CO2, and the samples were investigated using scanning electron microscope and digital microscope hardness tester. The results show that the surface of the coatings is smooth with diamond particles dispersed uniformly, and its average microhardness increases 80% than that of ordinary electrodepositing coatings. The influences of current density and diamond addition to the microhardness of composites were discussed as well as working pressure. The results show that the microhardness of composite coatings increases at first and then decreases with the increase of current density and diamond addition. Its maximum can reach 910 HV when the current density is 9 A dm−2. Working pressure variations from 10 to 14 MPa have no significant effect on the microhardness of coatings, which is more or less 900 HV. But the microhardness decreases dramatically when the working pressure is more than 14 MPa.
Published Version
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