Antiwear additives as retarding agents of elements with ceramic coatings wear

摘要

Purpose - The purpose of this paper is to determine the appropriate conditions for the chemical deposition of Ni-P-Al_2O_3 composite coatings, deposited on metalic matrix. Design/methodology/approach - Auto catalytic reduction of Ni in nickel sulfate and sodium hypophosphate bath, including 10 percent volume fractions of nanodispersive Al_2O_3 particles is treated in the alloy steel 100Cr6. The wear resistance and friction coefficient of the coatings are determined using tester T-01M, a ball-disc tester for mitigated solid friction conditions, in model lubricants: oil bases, oil bases with antiwear additives AW. Findings - The analysis of the properties of the Ni-P-Al_2O_3 deposits confirms that the presence of the dispersion phase of aluminium oxide determines the coating wearability. Practical implications - The paper presents some indications of proper selection of antiwear coating generation methods (their parameters and conditions). Originality/value - Investigations show that tribocatalytic effect of nickel coatings influence the intensity of antiwear layers generation in zinc dialkyldithiophosphates (ZDDP) tribochemical interaction in model lubricants and that tribochemical, adsorption, and reaction-diffusion effect of ZDDP, decided on great effectiveness of generated antiwear surface layers, which was confirmed by the results of tribological investigation.