The use of sodium silicate to improve wetting of tungsten carbide powder with ductile iron

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Nuno Lourenço (Autor) FEUP; Henrique Santos (Autor) FEUP; Carlos Sá (Autor) FEUP

Revista

Título: Materials Science Forum

Vol. 587-588

Páginas: 118-122

ISSN: 0255-5476

Editora: Trans Tech Publications Ltd

Indexação

Scopus

INSPEC

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia de materiais

Outras Informações

DOI: 10.4028/www.scientific.net/MSF.587-588.118

Abstract (EN): A tungsten carbide insert is produced during ductile iron foundry practice to increase the surface hardness of the material. The insert is ensured with the help of a critical quantity of a binder, around 3 weight percent of sodium silicate, previously mixed with the tungsten carbide powder. The binder is verified to form a film around the tungsten carbide particles and bridges amongst these enveloped particles; these films and bridges are replaced by the ductile iron melt during the molding cavity filling. After solidification, a sound inserted layer is formed, composed of tungsten carbide particles in a tungsten enriched cast iron matrix. In the absence of the binder addition to the tungsten carbide powder no inserted layer is produced. The surface hardness of the inserted test pieces is close to 500VHN/4.9N and the respective thickness is around 2.5 mm. The characterization of the effect of the sodium silicate in the mixture has been the main purpose of this work

Idioma: Inglês

Tipo (Avaliação Docente): Científica