2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

SiC Particulate Reinforced Ni-based Composite Coating with Self-Lubricity

H. Zhang, J. McKee, D. Xiao
Inframat Corporation, US

Keywords:
self-lubricity, friction, wear resistance, silicon carbide, nickel based composite coating

Abstract:
A nickel composite coating with self-lubricity has been deposited using a modified industrial nickel sulfamate solution plating bath. The electrolyte included a slurry of self-lubricating (SL) nanoparticlulates and SiC in nickel sulfamate. The co-deposited particulates SiC and SL into nickel matrix were achieved through an electrophoretic process. To assure the particles migrating to the vicinity of the cathode, the cataphoretic additives are added to provide a positive surface charge to the particles. Electrical field and electrolyte concentration affect the formation and composition of the coating. The study indicted that the pH value affects the plating rate and volume percentage of particles in the composite coating. In the present experiment, pH 4 leads to highest deposition rate of 47 m/per half hour. The hard coatings show good integrity and high lubricity. Pin-on desk siding wear tests derived that the composite coating shows less friction coefficient and slower mass wear loss rate than that of to the black oxide. The SiC/SL composite coating plated with pH 5 exhibits a friction coefficient of 0.092, comparing to 0.13 of black oxide. The mass loss rate is 3.9 10-6 ug/m, which is more than 2-order less than 6.8 10-3 mg/m of black oxide. Details of the study will be addressed in the presentation.


Nanotech 2008 Conference Program Abstract