WEAR OF ELECTROLESS NICKEL-PHOSPHORUS COMPOSITE COATINGS WITH NANODIAMOND PARTICLES

摘要

The work presents results for the wear characteristics of electroless nickel-phosphorus composite coatings with and without diamond nanoparticles with dimensions of 4, 40, 100, 200 and 250 nm. The coatings were obtained by the technology of EFFTOM NIKEL at the Faculty of Industrial Technology at the Technical University of Sofia. Results obtained were on the effect of heat treatment of coatings and the size of diamond nanoparticles on mass wear, wear rate and wear resistance under abrasive friction conditions when greasing with LITEL U-2 grease. It has been found that the heat treatment of all coatings - with and without diamond nanoparticles - leads to increased abrasion resistance. Embedding diamond nanoparticles into electroless nickel composite coatings increases abrasion resistance but it has not a disproportionate impact. The relationship between the size of nanodiamond particles and abrasion resistance is with a wavy nature with pronounced maxima and minima. The highest wear resistance is obtained with coatings of 100 nm diamond nanoparticles and heat treatment of the coating. By increasing the size of diamond nanoparticles, the hardness of the coatings increases with heat treatment. For coatings without heat treatment, this increase occurs to a diamond nanoparticle size of 100 nm.