Magnesium oxide annealing isolation agent for oriented silicon steel and coating process

Abstract

The invention relates to a magnesium oxide coating process for oriented silicon steel, in particular to a magnesium oxide coating process for improving the quality of an oriented silicon steel coating. The magnesium oxide coating process comprises the following steps that firstly, magnesium oxide coating liquid is prepared according to the formula of 10-12 % of silicon steel grade MgO, 0.27-0.8% of TiO2, 0.18-0.33% of B, 0.03-0.08% of Re and the balance water; secondly, a steel strip obtained after secondary cold rolling is performed is coated with prepared magnesium oxide coating liquid through a coating machine; and thirdly, drying and coiling are performed through a drying furnace after coating. According to the magnesium oxide coating process, the rare earth elements are innovatively added to the magnesium oxide coating liquid, and through optimized configuration of different components, the rare earth elements and elements such as aluminum, magnesium and silicon in the silicon steel can well form composite oxides, and a pinning effect on the interface is played, so that the better bonding force between the bottom layer formed on the surface of the oriented silicon steel and asubstrate is improved, and the surface quality and adhesion of the oriented silicon steel are improved effectively.

Description

technical field [0001] The invention relates to a processing technology for oriented silicon steel, in particular to a magnesium oxide annealing separator for oriented silicon steel and a coating process. Background technique [0002] Grain-oriented silicon steel is known as a work of art in steel, and it is a soft magnetic alloy with high magnetic flux density, which is mainly used to make iron cores of motors and transformers. At present, in the production process of grain-oriented silicon steel, magnesium oxide (MgO) needs to be coated on the surface of the steel plate before high-temperature annealing. During the annealing process, MgO reacts with the oxide formed on the surface layer of the steel plate substrate to form a magnesium silicate bottom layer. The quality of the bottom layer of magnesium silicate directly affects the insulation performance and adhesion performance of the finished product, and also affects the surface appearance quality. However, in the produ...

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Problems solved by technology

The quality of the bottom layer of magnesium silicate directly affects the insulation performance and adhesion performance of the finished product, and also affects the surface appearance quality

However, in the production process, due to the lack of research on the reaction behavior of magnesium oxide, defects such as dew crystals, blackened bottom layer, bluish, poor color, poor adhesion, and peeling off of the edge of the steel strip during cutting often appear, which affect product quality and cause business losses. large economic loss

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