Abstract
Tribological properties of WC cermet coating layers which are thermal sprayed are researched. On the assumption of the severe sliding condition in which large compress and tensile stress are applied to a surface layer simultaneously, relatively hard material is chosen as counter parts and additional tensile stress is applied. WC/12%Co is employed as coating material by High Velocity Oxy-Fuel (HVOF) spray and Warm Spray processes. From the experimental results, it is found that the WC cermet sprayed coatings are inferior to sintered WC/Co with regard to fracture toughness near the surface and pseudo-plastic deformation which are main wear behavior in severe sliding condition.
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