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

Title
The Use of Sodium Silicate to Improve Wetting of Tungsten Carbide Powder with Ductile Iron
Type
Article in International Conference Proceedings Book
Year
2008
Authors
Lourenco, N
(Author)
Other
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Santos, H
(Author)
Other
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Conference proceedings International
Pages: 118-122
13th Conference of the Sociedade-Portuguesa-de-Materiais/4th International Materials Symposium
Oporto, PORTUGAL, APR 01-04, 2007
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Authenticus ID: P-004-271
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 fillip,. 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.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 5
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