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A Magnesium Oxide Coating Process for Improving the Underlayer of Oriented Silicon Steel

A technology of oriented silicon steel and coating process, which is applied in heating inorganic powder coating and other directions, can solve the problems of affecting output and technical difficulty, and achieve the effects of low cost, uniform color and avoiding difficult process.

Active Publication Date: 2019-08-02
新万鑫(福建)精密薄板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this kind of defect, it is usually necessary to adjust the process to control the formation of silicon dioxide film on the surface during decarburization annealing. However, this method has the disadvantages of high technical difficulty and affecting yield

Method used

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  • A Magnesium Oxide Coating Process for Improving the Underlayer of Oriented Silicon Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A magnesium oxide coating process for improving the bottom layer of grain-oriented silicon steel; it is characterized in that it includes the following steps:

[0024] (1) Clean the surface of the oriented silicon steel strip. First, scrub the surface of the steel strip with lye, the concentration of lye is 2.5%, the temperature of the lye is 70°C, and then the lye residue on the surface of the steel strip is rinsed with water with a water pressure of 0.1Mpa and a temperature of 80°C. Air-dry the steel strip at the outlet of the water tank. Among them, the heating method of lye and clear water can be electric heating or steam heating.

[0025] (2) Add 290 kg of pure water in the magnesia liquid mixing tank, fully cool, then add 1 kg of silica sol solution, and stir for 30 minutes; the silica sol solution is nano-scale silica sol, with a pH value of 9, a concentration of 33%, and a specific gravity of 1.205.

[0026] (3) Add 1kg of titanium dioxide, stir for 30-90min, ...

Embodiment 2

[0030] A magnesium oxide coating process for improving the bottom layer of grain-oriented silicon steel; it is characterized in that it includes the following steps:

[0031] (1) Clean the surface of the oriented silicon steel strip. First, scrub the surface of the steel strip with lye, the concentration of lye is 4%, the temperature of lye is 65°C, then the water pressure is 0.1Mpa, and the temperature is 90°C to rinse the lye residue on the surface of the steel strip. Air-dry the steel strip at the outlet of the clear water tank. Among them, the heating method of lye and clear water can be electric heating or steam heating.

[0032] (2) Pre-oxidize the grain-oriented silicon steel strip before MgO coating; the pre-oxidize treatment is carried out in a continuous annealing furnace, the treatment time is 240s, and the treatment temperature is 480°C.

[0033] (3) Add 300kg of pure water into the magnesia liquid mixing tank, fully cool, then add 2kg of silica sol solution, and...

Embodiment 3

[0038] A magnesium oxide coating process for improving the bottom layer of grain-oriented silicon steel; it is characterized in that it includes the following steps:

[0039] (1) Clean the surface of the oriented silicon steel strip. First refresh the surface of the steel strip with lye, the concentration of the lye is 5%, the temperature of the lye is 60°C, and then the lye residue on the surface of the steel strip is rinsed with water with a water pressure of 0.1Mpa and a temperature of 100°C, and finally in the Air-dry the steel strip at the outlet of the clear water tank. Among them, the heating method of lye and clear water can be electric heating or steam heating.

[0040] (2) Pre-oxidize the grain-oriented silicon steel strip before MgO coating; the pre-oxidize treatment is carried out in a continuous annealing furnace, the treatment time is 300s, and the treatment temperature is 520°C.

[0041] (3) Add 320 kg of pure water in the magnesia liquid mixing tank, fully co...

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Abstract

The invention relates to a production method for oriented silicon steel, in particular to a magnesium oxide coating process for improving a bottom layer of oriented silicon steel. The process includes the following steps that (1) an oriented silicon steel strip is subjected to surface cleaning; (2) the oriented silicon steel strip is subjected to pre-oxidation before magnesium oxide coating; (3) 290-320 kg of pure water is added into a magnesium oxide fluid preparation tank, and after full cooling, 1-3 kg of a silica solution is added and stirred for 30-90 min; (4) 1-3 kg of titanium dioxide is added, 40 kg of magnesium oxide powder and 0.6-1.2 kg of a boron additive are added after stirring, and the surface of the oriented silicon steel strip is coated with the magnesium oxide powder and the boron additive after 60-150 min of stirring; and (5) the coated oriented silicon steel strip is subjected to drying sintering in a drying furnace. According to the magnesium oxide coating process, operation is simple, the cost is low, and the defects that traditional bottom layer control processes are high in difficulty and complex in operation and affect the yield are overcome.

Description

technical field [0001] The invention relates to a method for producing oriented silicon steel, in particular to a magnesium oxide coating process for improving the bottom layer of oriented silicon steel. Background technique [0002] Grain-oriented silicon steel is an important material for transformer iron core, which needs to have good surface insulation performance and good appearance. A layer of magnesium silicate bottom layer will be formed on the surface of grain-oriented silicon steel during the production process. The integrity and appearance of the magnesium silicate bottom layer will directly affect the adhesion, gloss, surface color and overall insulation performance of the subsequent insulating coating. Therefore, in the production process of grain-oriented silicon steel, the formation of a dense, uniform color and a certain thickness of the bottom layer is currently the focus of research by various manufacturers and scientific research institutions. [0003] At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08
CPCC23C24/08
Inventor 蔡伟孟凡娜许洁滨戴东火张维林张爱春
Owner 新万鑫(福建)精密薄板有限公司