EP 0416420 B1 19941214 - Magnesium oxide coating for electrical steels and the method of coating.
Title (en)
Magnesium oxide coating for electrical steels and the method of coating.
Title (de)
Magnesiumoxyd-Beschichtung für Elektrobleche und Beschichtungsverfahren.
Title (fr)
Revêtement d'oxyde de magnésium pour aciers électriques et procédé pour former un revêtement.
Publication
Application
Priority
US 40471489 A 19890908
Abstract (en)
[origin: EP0416420A2] Decarburized grain oriented silicon steel is provided with an annealing separator which forms a glass film after the final high temperature anneal. The magnesia used as the annealing separator has a total chlorine level of 0.01 to 0.20% by weight based on the weight of magnesia with at least 0.01% metal chloride selected from the group of Mg, Ca, Na and K. The chloride addition acts to seal the coating surface during the final anneal to control diffusion and stabilize the secondary grain growth. The glass film which forms during the anneal may be laser scribed for domain refinement without coating damage. The magnesia may also contain additions of phosphates, TiO2, SiO2, Cr and B. The temperature of the magnesia is maintained below 25 DEG C to control hydration and eliminate the need for other additives in the magnesia slurry to control hydration.
IPC 1-7
IPC 8 full level
C23C 22/00 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); H01F 1/16 (2006.01); C21D 3/04 (2006.01)
CPC (source: EP KR)
C21D 1/70 (2013.01 - KR); C21D 8/12 (2013.01 - KR); C21D 8/1283 (2013.01 - EP); C21D 3/04 (2013.01 - EP)
Designated contracting state (EPC)
BE DE FR GB IT
DOCDB simple family (publication)
EP 0416420 A2 19910313; EP 0416420 A3 19921119; EP 0416420 B1 19941214; BR 9004444 A 19910910; CA 2024226 A1 19910309; CA 2024226 C 20000215; DE 69015060 D1 19950126; DE 69015060 T2 19950427; JP 2686455 B2 19971208; JP H03120376 A 19910522; KR 0173781 B1 19990218; KR 910006518 A 19910429
DOCDB simple family (application)
EP 90116384 A 19900827; BR 9004444 A 19900906; CA 2024226 A 19900829; DE 69015060 T 19900827; JP 23599290 A 19900907; KR 900014201 A 19900908