5 documents found, page 1 of 1
Development of WC-NiCrMo hardmetals
Pereira, P.; Rocha, A.M. Ferro; Bastos, A.C.; Oliveira, F.J.; Vilhena, L.M.; Ramalho, A.; Sacramento, J.; Malheiros, L.F.; Senos, A.M.R.The demand for improved components with a wide range of properties is a reality in today's hardmetal market. Furthermore, supply shortages of raw materials such as W and especially Co resulted in rapid price fluctuations. Combined with stricter environmental legislation and health protection, these facts prompt the demand for alternative or modified binders. Therefore, in this work, WC-NiCrMo composites were de...
Corrosion resistance of WC hardmetals with different Co and Ni-based binders
Pereira, P.; Rocha, A.M. Ferro; Sacramento, J.; Oliveira, F. J.; Senos, A. M. R.; Malheiros, L. F.; Bastos, AlexandreIn this work, industrially relevant WC composites with alternative binders (Ni, CoNi, NiCr, CoCr, CoNiCr and NiCrMo) were produced and their corrosion resistance in 0.5 M NaCl was compared to conventional WC-Co system. The main objective is to develop hardmetals with higher corrosion resistance to extend the lifetime of tools and equipment, reducing the demand for new parts and maintenance, thus decreasing the ...
Microstructural characterization and corrosion resistance of WC-Ni-Cr-Mo compos...
Santos, R.F.; Rocha, A.M. Ferro; Bastos, A.C.; Cardoso, J.P.; Rodrigues, F.; Fernandes, C.M.; Sacramento, J.; Ferreira, M.G.S.; Senos, A.M.R.WC-Ni-Cr-Mo are good candidates for replacing WC-Co for its better corrosion performance. This work investigated the effect of different Mo content on the mechanical properties and corrosion susceptibility of WC-Ni-Cr-Mo composites in chloride and sulphate acidic media. Chemical, microstructural, and electrochemical analysis were performed. Results show chlorides are frankly more aggressive than sulphates, but ...
Corrosion behaviour of WC hardmetals with nickel - based binders
Rocha, A.M. Ferro; Bastos, A.C.; Cardoso, J.P.; Rodrigues, F.; Fernandes, C.M.; Soares, E.; Sacramento, J.; Senos, A.M.R.; Ferreira, M.G.S.Cobalt is the standard binder in tungsten carbide (WC) hardmetals due to its compatibility with the WC phase, resulting in composites with exceptional hardness and wear resistance. However, their corrosion resistance is not satisfactory in many applications, leading to the early deterioration and failure of tools and equipment. In this work, the corrosion of WC hardmetals with three alternative binders (FeCoNi,...
WC – (Cu: AISI304) composites processed from high energy ball milled powders
Cardoso, J.P.; Puga, J.; Rocha, A.M. Ferro; Fernandes, C.M.; Senos, A.M.R.Alternative binders to cobalt, based on stainless steel (SS, AISI304) and copper were investigated for tungsten carbide (WC) based cemented carbides. The binder content was fixed at 12 wt%, and the Cu:SS ratio varied in proportions of 0:1, 1:5, 1:2, 1:1, 1:0. High energy ball milling was applied to ensure high homogenization, nanometric particle size and mechanical alloying of binder elements in the powders' mi...