High Temperature 3-body Abrasive Wear of HVOF and HVAF Sprayed Cr3C2-NiCr Coatings
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review
|Title of host publication||Surface Modification Technologies XXVIII|
|Subtitle of host publication||Proceedings of the Twenty Eighth International Conference on Surface Modification Technologies|
|Editors||T.S. Sudarshan, Petri Vuoristo, Heli Koivuluoto|
|Publication status||Published - Jan 2015|
|Publication type||A4 Article in a conference publication|
|Event||International Conference on Surface Modification Technologies - , Finland|
Duration: 1 Jan 2000 → …
|Conference||International Conference on Surface Modification Technologies|
|Period||1/01/00 → …|
For wear protection at high service temperatures, chromium carbide based coatings deposited with high velocity oxy-fuel (HVOF) and high velocity air-fuel HVAF techniques are most suitable.
In this study, various Cr3C2-NiCr powders were sprayed with both HVOF and HVAF processes. The microstructure, porosity level and hardness values of the deposited coatings were measured. In addition, three-body abrasive wear resistance of these coatings was tested at 300°C, 500°C and 700°C. The wear tracks and cross sections of tested coatings were studied with scanning electron microscopy (SEM), in order to characterize the wear mechanisms at high
The results show that at lower testing temperatures, powder selection and spraying process defines the wear rate of the coating. However, at maximum testing temperature, the differences in wear rates between tested coatings decreases. This is due to microstructural changes in coating at high temperatures.