Process for preparing mold

Details Process for preparing mold Process for preparing mold

1976-09-23

1978-03-07

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

106 3827, 106 3835, 264225, C04B 3564

Patent

active

040780295

ABSTRACT:
A process for preparing a mold by preparing a slurry of refractory powder in a binder solution comprising silica sol and monomethyl triethanol ammonium silicate or tetraethanol ammonium silicate at a mole ratio of SiO.sub.2 /M.sub.2 O of 10 to 22 and a mole ratio of SiO.sub.2 /NR of 9 to 28 wherein M represents Li or Na and NR represents monoethyl triethanol ammonium hydroxide or tetraethanol ammonium hydroxide, and repeating an overcoating of said slurry and a refractory powder by coating said slurry on a pattern, sanding said refractory powder on the coated pattern and drying it to form a green mold, separating said green mold from said pattern and calcining said green mold.

REFERENCES:
patent: 3537949 (1970-11-01), Brown et al.
patent: 3655578 (1972-04-01), Yates

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