Preparation and wear properties of brazed diamond wear-resistant coatings

In order to improve the abrasive wear resistance of tool parts for agricultural machines, a preparation method of diamond wear-resistant coating based on brazing was proposed. The coatings were prepared on Q235 steel substrate with different particle sizes and plating states of diamond grits, the friction and anti-abrasive wear properties of brazed diamond coatings were studied comparing to 65Mn steel. Scanning electron microscopy (SEM) was used to characterize the microstructure of coating surface before and after wear test, and the interface between coatings and steel substrate. The wear law and mechanism of the coatings were also analyzed. The results showed that the brazed diamond coatings were bonded well with the steel matrix, and that the diamond grits were evenly distributed in the coatings with a thickness of about 370 μm. The wear resistance of brazed diamond coatings was better than that of 65Mn steel, and with the decrease of particle size of diamond grits, the friction coefficient decreased and the wear resistance increased. The friction and anti-abrasive wear resistance of brazed tungsten-plated diamond coatings were higher than those of brazed uncoated diamond coatings.