Insulation coating composition for directional electromagnetic steel sheet, insulation coating forming method for directional electromagnetic steel sheet using this, and directional electromagnetic steel sheet

摘要

An insulation film composition for a grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 10-50 parts by weight of metal silicate or organic silicate, 20-70 parts by weight of inorganic nanoparticles and 0.1-20 parts by weight of cobalt hydroxide. The insulation film composition for the grain-oriented electric steel sheet according to an exemplary embodiment of the present invention includes 10-50 parts by weight of metal phosphate, 5-30 parts by weight of inorganic nanoparticles having a particle diameter of 1 nm to less than 10 nm, inorganic nanoparticles having a particle diameter of 10 to 100 nm and 0.1-20 parts by weight of chromium oxide.