Sintering of tungsten carbide (WC) coatings on 4340 steel with CO2 laser

Reference	Presenter	Authors (Institution)	Abstract
12-049	Rene Martins Volu	Dyer, S.A.(Instituto de Estudos Avançados); Volu, R.M.(Instituto Tecnológico de Aeronáutica); Jardim, V.R.(Instituto de Estudos Avançados); Vasconcelos, G.d.(Instituto de Estudos Avançados);	The use of coatings with high hardness has been studied extensively over the last years, in order to improve the wear resistance of mechanical components. Tungsten carbide (WC) coatings are one of the most used in the industry, in aerospace, automotive, transportation and power generation systems. The present work aims to improve the surface mechanical properties of the substrate by applying a spray coating sprayed WC coating and subsequent CO2 laser irradiation, in order to promote the sintering of the material. The samples were characterized by scanning electron microscopy, X-ray diffraction (XRD) to ascertain the phases present after the laser irradiation process, Vickers hardness measurements and wear test. The results show that it is possible to obtain coatings with high hardness, without pores and with diffusion between the materials
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