The Use of Sodium Silicate to Improve Wetting of Tungsten Carbide Powder with Ductile Iron

Abstract:

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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

Info:

Periodical:

Materials Science Forum (Volumes 587-588)

Edited by:

António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira

Pages:

118-122

DOI:

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

Citation:

N. Lourenço et al., "The Use of Sodium Silicate to Improve Wetting of Tungsten Carbide Powder with Ductile Iron", Materials Science Forum, Vols. 587-588, pp. 118-122, 2008

Online since:

June 2008

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Price:

$35.00

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