Manufacturing methods and its insulation coating treatment agent of grain-oriented electrical steel sheet having excellent film properties

摘要

PURPOSE: To obtain excellent transformer iron core workability and iron loss improving effect by forming an insulating film by the use of a treating agent having a specified compsn. ;CONSTITUTION: An insulating treating agent for a silicon steel sheet having a compsn. of solid solution type multiple metal hydroxides with ≤1μm average grain size expressed by a general formula of M²⁺_1-xM³⁺_x(OH)_2+x-nyA^n-mH₂O is used; where M²⁺ is divalent metals such as Be, Mg, Ca, Ba, Sr, Sn, Mn, Fe, Co, Ni, Co and Zn, M³⁺ is trivalent metals such as Al, Fe, Cr, Co, In, B, Ga and Ti, A^n- is n-valent anions of OH^-, F^-, Cl^-, Br^-, CO₃^2-, SO₄^2-, SiO₃^2-, HPO₄^2-, CrO₄^2-, (CH₃COOH)₂^2-, Fe (CN)₆^3-, HBO₃, 0x1.0 and 0y2.0 are satisfied and (m) is the number of interlayer water molecules. This treating agent is applied by 1 to 5g/m², by weight, after baking, and baking treatment is executed in the temp. range of 400 to 1200°C.;COPYRIGHT: (C)1995,JPO