B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
B22C 1/18 (2006.01) B22C 1/00 (2006.01) B22C 1/16 (2006.01) B22C 1/20 (2006.01)
Patent
CA 2318608
A process for rapidly forming a ceramic shell mold on an expendable pattern (1) is disclosed. The process entails use of refractory slurries which include a large particle size colloidal silica sol binder. The colloidal silica sol binder has an average particle size of about 40 manometers, i.e., about 3-4 times larger than colloidal silica sol binders heretofore employed in manufacture of ceramic shell molds. The use of the large particle sols yields unfired ceramic shell molds (20) which have about 40 % to about 70 % greater unfired strengths compared to ceramic shells made with prior art small particle size silica sols. Prime coats and refractory back-up coats which use the large particle size sol dry about 30 % to about 40 % faster than prime coats and back-up coats which employ the smaller particle size silica sole of the prior art.
L'invention porte sur un procédé de formation rapide d'une coquille de moule céramique sur un modèle dilatable (1) consistant à utiliser des boues réfractaires contenant comme liant une solution colloïdale de grosses particules de silice d'une taille d'environ 40 nm, soit environ 3 à 4 fois plus grosses que les particules utilisées antérieurement à cet effet. Les solutions colloïdales de grosses particules donnent des coquilles (20) présentant à l'état cru une résistance de 40 à 70 % supérieure à celle des solutions colloïdales de petites particules. Les couches d'apprêt et les couches de renfort réfractaires à base de solutions colloïdales de grosses particules sèchent d'environ 30 à environ 40 % plus vite que celles à base de solutions colloïdales de petites particules des techniques antérieures.
Buntrock Industries
Smith Paul Raymond
LandOfFree
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