Abstract

The tungsten carbide coatings in the cobalt matrix (WC-Co) and nickel-chromium carbide (NiCCr) are widely used to give greater resistance to abrasive wear to carbon steel. In this work, the possibility of applying these two coatings in the ABNT 52100 steel of a stretch bending roll, with the addition or not of an intermediate NiAl layer, using the thermal spray process HVOF (High Velocity Oxygen fuel), since this process has a small thermal input and allows the possibility of applying a great variety of coatings, including non-metallic ones. It was proposed to evaluate the performance of the samples in situations of high abrasive wear, also evaluating the role of the intermediate layer to improve adhesion of the coating to the substrate. For the evaluation of the resistance to abrasive wear and adhesive, the pin-on-disc tests (ASTM G99-17) and tensile tests (ASTM E8E8M-16a), respectively, were used. The surfaces of the samples were also evaluated by optical microscopy and electronic scanning. In addition, the hardness of each sample was also evaluated. With the tests, it was concluded that the samples with higher hardness and the presence of intermediate layerpresented faults in the interface of thesubstrate with coating, and the resistance to abrasive wear did not deviate much from the values in the literature.

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