Method for producing electric sheets with a glass coating

US5863356A · kind A · utility

Assignee

• EBG Gesellschaft für Elektromagnetische Werkstoffe mbH · DE

Inventors

• Fritz Bolling · Moers, DE
• Brigitte Hammer · Voerde, DE
• Thomas Dölle · Chemnitz, DE
• Klaus Gehnen · Gelsenkirchen, DE
• Heiner Schrapers · Duisburg, DE

Key dates

• Filing date: Oct 3, 1996
• Grant date: Jan 26, 1999
• Expiry date: Oct 3, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23D5/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention comprises a method for producing electric sheets, in particular grain-oriented electric sheets, with an evenly well-adhering glass film and with improved magnetic properties, in which the hot rolled strip which is produced at first and is optionally annealed is cold-rolled up to an end thickness in one or several steps, thereafter an annealing separator is applied to the strip which is rolled up to the end thickness, and is dried, and therafter the cold strip thus coated is subjected to high-temperature annealing, with an important component of the annealing separator being a hydrous magnesium oxide (MgO) dispersion and the annealing separator being additionally provided with at least one additive. The characterizing feature of the invention is that a finely dispersed water-soluble sodium phosphate compound is used as at least one additive.