Research on interface structure and performance of diamond brazed coating based on non-vacuum environment

Based on the non-vacuum environment furnace brazing method, a nickel-based diamond wear-resistant coating was prepared on the surface of the 65 Mn steel substrate. The results show that the interface structure of the diamond coating was affected by the brazing temperature and holding time, so as to the wear performance of the coating. The thickness of generated Cr-C compound at the interface between filler metal and diamnond was increased when the temperature increased from 1025 degrees C, 1050 degrees C, to 1100 degrees C and holding for 5 min. The size of the Cr-C compound in the filler metal was not increased significantly under the same condition. Poor wear resistance coating was prepared at 1025 degrees C/5 min condition because of the insufficient compounds at the interface and inferior hoolding force of filler metal to diamond. The wear resistance of the coating prepared at 1100 degrees C/5 min was also bad since the excess thickness of generated compound. The thickness and dimension of Cr-C compound at the interface were increased with the increasing of holding time (5 min, 15 min, 30 min) at 1050 degrees C. The embrittlement degree of interface was increased with the increases of Cr-C compound dimension, leading to the inferior holding force of filler to diamond and poor wear resistance of prepared coating. The wear resistance of the coating prepared at 1050 degrees C/5 min was the best. Compared with the original workpiece, the average wear weight loss of the workpiece was reduced from 0.3122 to 0.1691 g, and the wear resistance of the workpiece was about 2 times higher than that of original workpiece.

Automated summary

A nickel-based diamond wear-resistant coating was prepared on the surface of a 65Mn steel substrate using a non-vacuum furnace brazing method. The study found that the wear performance of the coating was affected by the brazing temperature and holding time. Increasing the temperature and holding time resulted in an increase in the thickness and dimension of the Cr-C compound at the interface, leading to poor wear resistance of the coating.