Determining the Influence of Chromium Concentration on the Erosive Wear of Ni-Cr-B-Si Coatings Applied by Supersonic Flame Jet (HVOF) | Chapter 5 | Recent Trends in Chemical and Material Sciences Vol. 9

The goal of the current research is to examine how the chromium content of powder composites affects the erosion wear of Ni-Cr-B-Si coatings applied by supersonic flame jet on substrates with and without thermal treatment. Coatings were created from each powder composite without any prior heat treatment of the sub-strate and with some preliminary thermal treatment of the substrate up to 650 C. Similar conditions of abrasive particle erosion in an air stream were used to evaluate the coatings. The report also includes comparison findings for erosion wear and coating erosion wear resistance. deposited by supersonic flame jet (HVOF), which contains composites Ni-Cr-B-Si with chromium concentrations ranging from 9.9% to 13.2 percent to 14 percent to 16 percent and 20 percent, with similar particle sizes of 45 μ m and with the same amount of the other elements boron and silicon. The coatings have been put through identical regimes of erosion using air streams carrying abrasive particles under the same circumstances, including the type, size, and velocity of the particles, the length of the erosion, air pressure, the distance between the nozzle and the surface, and the angle of the jet axis with respect to the surface. It has been established that the angle of the jet stream affects the wear resistance of all coatings. In comparison to the wear resistance at angle, the wear resistance at jet angle increases within the time interval of up to times for coatings that do not undergo thermal treatment of the substrate and within the time interval of up to times for coatings that do. For the coating No. 8 of, this impact is strongest at certain periods. The wear resistance improves up to at the jet angle, and this increase is the same for all coatings. There is a significant non-linearity in the connection between erosive wear resistance and Cr concentration. Wear resistance rises as Cr concentration rises, peaking at 16 percent Cr coatings with 60° jet angle thermal treatment of the substrate. It has been discovered that the coatings with the highest content but no boron or silicon have wear resistance that is lower or almost equivalent to that of the coatings with the lowest Cr concentration.

Author(s) Details:

M. Kandeva,

Faculty of Industrial Engineering, Tribology Center, Technical University – Sofia, 8 Kl. Ohridski Blvd, 1000 Sofia, Bulgaria.

Zh. Kalitchin,

SciBuCom 2 Ltd., P.O.Box 249, 1113 Sofia, Bulgaria.

Y. Stoyanova,

Faculty of Industrial Engineering, Tribology Center, Technical University – Sofia, 8 Kl. Ohridski Blvd, 1000 Sofia, Bulgaria.

Please see the link here: https://stm.bookpi.org/RTCAMS-V9/article/view/7378