Structure and properties of Ni-P/PTFE composite coatings produced by chemical reduction method
Maria Trzaska, Grzegorz Cieślak, Anna Mazurek
Quarterly No. 3, 2016 pages 174-179
DOI:
keywords: alloy coatings, composite layers, Ni-P matrix, teflon, electroless process
abstract The paper presents the results of investigations on Ni-P/PTFE alloy composite coatingsproduced by the electroless method. Ni-P coatings were deposited from two baths differing in composition and pH (acidic and alkaline). PTFE powders with a nanometric size of particles was used as the dispersion phase. The coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), optical microscopy, roughness measurements and Vickers microhardness measurements. Abrasive wear testing of the Ni-P/PTFE coatings was carried out by friction of the ball at a constant pressure on the sample using a Calotest apparatus. Images of the surface morphology, cross section of the coatings and sample surfaces after wear tests are presented. The coatings are compact and have good adhesion to the steel substrate. Incorporation of the PTFE powder particles in the nickel-phosphorus matrix increases the degree of surface development and hardness of the coating material and increases the wear resistance.