Method for coating refractory molds

Details Method for coating refractory molds Method for coating refractory molds

1986-05-09

1987-05-12

Hayes, Lorenzo B.

Coating processes

Mold coating

Sand mold

106 3822, 164 14, 164 33, B44D 120

Patent

active

046649484

ABSTRACT:
Binder, filler, and refractory compositions and methods of using and making these compositions are disclosed. The binder composition comprises colloidal silica, a liquid material containing Si-OH groups, a solvent which is capable of solubilizing the liquid material and the colloidal silica, and at least one aprotic, non-ionic, non-metallic, organic compound which contains at least one element selected from P, S, B and N and which stabilizes the binder composition against self-gelling. The liquid material and the colloidal silica are present in a ratio by weight of from about 10:1 to about 1:10 respectively. The liquid material has at least about 20% by weight SiO.sub.2. The colloidal silica contains at least about 15% by weight SiO.sub.2. The solvent and the organic compound are present in amounts so as to solubilize the liquid material and the colloidal silica, to provide a binder composition which is stable against self-gellation, and to provide a binder composition which gels to a single phase.

REFERENCES:
patent: 4319925 (1982-03-01), Brown
patent: 4609570 (1986-09-01), Couleau et al.

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