Molding sand suitable for manufacturing cores and chill-molds

Details Molding sand suitable for manufacturing cores and chill-molds Molding sand suitable for manufacturing cores and chill-molds

B - Operations, Transporting

22

C

B22C 1/02 (2006.01) B22C 1/00 (2006.01) B22C 1/18 (2006.01) B22C 9/02 (2006.01) B22C 9/10 (2006.01) C04B 20/00 (2006.01) C04B 26/10 (2006.01) C04B 35/18 (2006.01)

Patent

CA 2248329

The molding sand comprises hollow microspheres of aluminum silicate, preferably with an aluminum content between 15 and 45% by weight, a wall thickness between 3 and 10% of the particle diameter and a particle size between 10 and 350 µm. These sands are useful to manufacture low density cores with good "veining" and penetration characteristics, moreover maintaining the mechanical properties of the core obtained. These cores are useful in the manufacture of iron casting.

Le sable de moulage décrit comprend des microsphères creuses de silicate d'aluminium, de préférence avec une teneur en alumine comprise entre 15 et 45 % en poids, une grosseur de paroi comprise entre 3 et 10 % du diamètre de la particule et une taille de particule comprise entre 10 et 350 mu m. Ledit sable sert à fabriquer des noyaux de basse densité présentant de bonnes caractéristiques de "veining" et de pénétration, et permet de conserver en outre les propriétés mécaniques du noyau obtenu. Lesdits noyaux servent à la fabrication de pièces de fonderie.

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