Durability and tribological properties of thermally sprayed wc cermet coating under lubricated rolling-sliding contact
Durability and tribological properties of thermally sprayed WC-Cr-Ni cermet coating were investigated experimentally under lubricated rolling with sliding contact conditions. By means of the high energy type flame spraying (Hi-HVOF) method, the coating was formed onto the axially and circumferent...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IIUM Press
2007
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/27119/ http://irep.iium.edu.my/27119/1/028_IIUM_Eng_Jr_2007_8%281%29_49-62.pdf |
| Summary: | Durability and tribological properties of thermally sprayed WC-Cr-Ni cermet
coating were investigated experimentally under lubricated rolling with sliding contact
conditions. By means of the high energy type flame spraying (Hi-HVOF) method, the
coating was formed onto the axially and circumferentially ground roller specimens made
of a thermally refined carbon steel. In the experiments, the WC cermet coated steel roller
was mated with the carburized hardened steel roller without coating in line contact
condition. The coated roller was mated with the smooth non-coated roller under a
contact pressure of 1.0 or 1.2 GPa. The coated roller was also mated with the rough noncoated
roller under a contact pressure of 0.6 or 0.8 GPa. It was found that the coating on
the circumferentially ground substrate shows a lower durability compared with that on
the axially ground substrate. This difference appears more distinctly for the higher
contact pressure for both smooth and rough mating surface. It was also found that there
are significant differences in the tribological properties of WC cermet coating depending
on the contact pressure. In addition, depending on the mating surface roughness or
substrate surface finish, remarkable differences in the tribological properties such as oil
film formation, surface roughness, appearance of the coated surface ,depth of flaking etc.
were found. |
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