resumo
The wetting behavior of copper on tungsten carbide surfaces was investigated through the sessile drop method, at 1080 degrees C, in vacuum atmosphere. Tests were performed on three different types of substrates: (i) commercial sample of WC-Co with 3.5 wt% of cobalt; (ii) WC thin film sputter-deposited on the aforementioned commercial WC-Co sample and (iii) WC sample processed by hot pressing. The lowest final contact angle was achieved on the WC-Co surface (6), followed by those of WC thin film (13) and WC (25). The contact angle values were inversely correlated with the wetting behavior, i.e. the highest wettability was found for the WC-Co and the lowest for the WC surfaces. Structural, microstructural and elemental characterizations of the interface region between the molten copper and the substrate were performed, using low angle X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). The wettability behavior was discussed taking into consideration the effect of minor phases, such as cobalt. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
palavras-chave
COMPOSITES
categoria
Materials Science
autores
Silva, VL; Fernandes, CM; Senos, AMR
nossos autores
Ana Maria de Oliveira e Rocha Senos
Professor associado
Cristina Maria da Silva Fernandes
Colaborador
Vera Liliana Ferreira e Silva
Estudante de mestradoagradecimentos
The authors gratefully acknowledge Prof. Dr. M.T. Vieira from CEMUC, University of Coimbra for the facilities on the sputter deposition technique. This research is sponsored by the Reference Framework (QREN/I&DT/11428/2009) of the European Regional Development Fund (ERDF). This work was developed within the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID /CTM /50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.