Process for preparing mold
US4078029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1976 |
| Grant date | Mar 7, 1978 |
| Priority date | — |
| Expiry date | Sep 23, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/6316
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.