Influence of the content of ceramic microparticles on friction and wear of gas-dynamic coatings of the AMg6–C60–AlN system
摘要
Coatings of the AlMg6–C60–AlN system were deposited by cold gas-dynamic spraying of agglomerated powder mixtures, containing 25, 35, and 50 wt. % AlN particles. The effect of ceramic particle concentration in the powder mixture on the growth efficiency, structure formation, and phase composition, as well as on coating microhardness was studied. Dry sliding wear tests were subsequently carried out. The influence of AlN content on the friction coefficient and wear rate was evaluated. The coating produced from the powder mixture containing 35 wt. % AlN demonstrated the most favorable tribological performance. In this case, the actual content of AlN ceramic particles in the coating was 13.2 wt. %, while the corresponding friction coefficient and wear rate were 0.34 and 2.15 × 10−4 mm3 × N−1 × m−1, respectively. The specifics of surface morphology evolution under friction were studied. It was shown that a transition layer was formed on the friction surface, protecting it from severe adhesive wear, with contact interaction being realized through the formation of a third body. The developed coatings can be used to enhance the performance properties of machine component surfaces operating under the tribological loading conditions.