Barium or chromium additives to magnesium oxide coating slurry
US4512823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1984 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Apr 10, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The instant invention is directed to a slurry for use in coating silicon steel prior to high temperature annealing, comprising magnesium oxide, water and at least one inorganic compound selected from the group consisting of barium oxide, barium nitrate, chromium nitrate, and their hydrates. The instant invention is also directed to a process for coating silicon steel, comprising coating the steel with a magnesium oxide slurry prior to high temperature annealing, the improvement wherein at least one inorganic compound selected from the group consisting of barium oxide, barium nitrate, chromium nitrate, and their hydrates is pre-mixed in said slurry, thereby minimizing the formation of "tight magnesia" on the steel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.