| 摘要 |
An aqueous magnesia slurry for forming an insulative glass coating on silicon steel, wherein at least 25% of the magnesia is inactive (a citric acid activity greater than 200 seconds), a decomposable phosphate compound chosen from calcium phosphates, water-soluble ammonium polyphosphate, aluminium phosphate, magnesium phosphates, phosphoric acid and mixtures thereof is present within the range of 2% to 25% by weight calculated as P2O5, based on the dry weight of magnesia, and the magnesia concentration is up to 0.6 g/cc, preferably at least 0.24 g/cc of slurry. The slurry is stable against settling for up to 10 hours and has a desirable viscosity for coating application by conventional means. |
