US 11,667,985 B2
Composition for forming insulation film of oriented electrical steel sheet, method for forming insulation film by using same, and oriented electrical steel sheet having insulation film formed therein
Min Soo Han, Pohang-si (KR); Hyung Don Joo, Pohang-si (KR); Hyung Ki Park, Pohang-si (KR); Jae-Keun Shin, Pohang-si (KR); and Chang-Soo Kim, Pohang-si (KR)
Assigned to POSCO Co., Ltd, Pohang-si (KR)
Appl. No. 15/770,098
Filed by POSCO, Pohang-si (KR)
PCT Filed Dec. 22, 2015, PCT No. PCT/KR2015/014108
§ 371(c)(1), (2) Date Apr. 20, 2018,
PCT Pub. No. WO2017/069336, PCT Pub. Date Apr. 27, 2017.
Claims priority of application No. 10-2015-0146105 (KR), filed on Oct. 20, 2015.
Prior Publication US 2018/0312936 A1, Nov. 1, 2018
This patent is subject to a terminal disclaimer.
Int. Cl. C21D 8/12 (2006.01); C22C 38/00 (2006.01); C23C 22/22 (2006.01); C22C 38/02 (2006.01); C23C 22/74 (2006.01); C21D 1/30 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/60 (2006.01)
CPC C21D 8/1283 (2013.01) [C21D 1/30 (2013.01); C21D 8/12 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 8/1272 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/60 (2013.01); C23C 22/22 (2013.01); C23C 22/74 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A composition for forming an insulation coating film of an oriented electrical steel sheet, comprising:
a composite metal phosphate, a derivative thereof, or a mixture thereof, and
at least two colloidal silicas having different average particle diameters,
wherein a weight ratio of the colloidal silicas to the composite metal phosphate, the derivative thereof, or the mixture thereof (colloidal silicas/composite metal phosphate, a derivative thereof, or a mixture thereof) is 1.3 to 1.8.