Boron carbide interlayers on WC-CO inserts by MOPA laser methods

Reference	Presenter	Authors (Institution)	Abstract
12-053	Andre Contin	Contin, A.(Universidade Federal de Goiás); Volu, R.M.(Instituto Tecnológico de Aeronáutica); Dyer, S.A.(Instituto de Estudos Avançados); Claudino, M.F.(PROMARKING); Damm, D.D.(Universidade Federal de São Paulo); Corat, E.J.(Instituto Nacional de Pesquisas Espaciais); Vasconcelos, G.d.(Instituto de Estudos Avançados);	The demand for better machining tools are increasing as they are widely employed in the aerospace industries. The use of CVD diamond coating as a protective film creates an increase in surface hardness, friction reduction and better corrosion protection. Another important reason with CVD diamond deposition on the tool is the use of green machining. However, lack of adhesion between diamond coating and substrate leads to a shorter coated tool life than expected. The main reasons for this displacement are: the presence of the cobalt binder and the residual stresses at the interface. The goal of this work is to deposit a powder layer on the WC-Co surface. This intermediate layer acts to a diffusional barrier against the cobat. In this work, we used the boron carbide powder to create the intermediate layer. The technique for creating this intermediate barrier was the laser cladding process. In this process, a thin powder layer previously deposited on the surface was irradiated by a laser beam, thereby creating an intermediate coating, dense and strongly bonded to the substrate. The samples characterization included X-ray Diffraction (XRD); Field Emission Gun - Scanning Electron Microscopy (FEG-SEM), Energy Dispersive and X-ray (EDX). Results showed that laser incidence dissociated partially the boron carbide powder forming new phases on substrate surface. In addition, the FEG-SEM images showed the sintering process of boron carbide on WC-Co matrix.
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