Influence of particle size and content on the friction and wear behaviors of as-annealed Ni–Mo/diamond composite coatings

• Published in: Wear 2020-07, Vol.452-453, p.203300, Article 203300
• Main Authors: Liu, J.H., Liu, Y.D., Pei, Z.L., Li, W.H., Shi, W.B., Gong, J., Sun, C.
• Format: Article
• Language: English
• Subjects: Annealing; Coated electrodes; Composite coating; Diamond films; Diamonds; Friction; Grain size; Hardness; Microhardness; Molybdenum; Nickel; Protective coatings; Wear; Wear rate; Wear resistance
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2020.203300

Ni–Mo/diamond composite coatings have been electrodeposited in a Ni–Mo electrolyte containing micron diamonds with five different sizes, respectively. The diamond content in coatings is in the range of 5–31 vol%. The grain size of as-annealed coatings is smaller than 10 nm. Microhardness of as-annealed coatings increases with the diamond content, and the highest hardness is about 15.4 GPa. The as-annealed coatings incorporated with 5 μm diamonds have supvderior wear resistance to that of the other coatings. The lowest wear rates of the as-annealed coating and the pin-on-disk system are about 2 × 10−6 and 5 × 10−6 mm3 N−1 m−1, respectively, which all correspond to the coating containing 31 vol% diamonds with the size of 5 μm. •Ni–Mo/micron diamond composite coating was prepared by electrodeposition.•Microhardness of the composite coatings increases with diamond content.•High diamond size and content are helpful improving the tribological performance of coatings.