Coating liquid for forming insulation coating for grain-oriented electrical steel sheets, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet
AssigneeNippon Steel Corporation
InventorsShuichi Yamazaki, Shinsuke Takatani, Hiroyasu Fujii, Kazutoshi Takeda
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Abstract
A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum, and a method for producing a grain-oriented electrical steel sheet comprising applying the coating liquid to a grain-oriented electrical steel sheet after final annealing, and then performing a baking treatment.
Claims11
A coating liquid for forming an insulation coating for a grain-oriented electrical steel sheet by a baking treatment at a baking treatment temperature of 600° C. to 1000° C., containing aluminum-containing hydrated silicate particles and boric acid, and not containing an organic component, wherein polyphosphate is present in the aluminum-containing hydrated silicate particles in a range of 0 to 20 mass % with respect to the aluminum-containing hydrated silicate particles, and
- wherein the content ratio of the aluminum-containing hydrated silicate particles to the boric acid is from 0.1 to 1.5 as B (boron)/Al (aluminum) molar ratio in the coating liquid.
Dependencies are inferred from the claim text.