Annealing Separator Composition for Grain-Oriented Electrical Steel
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Solution Overview
Problem
Current annealing separator materials for grain-oriented electrical steel sheets are expensive and have poor workability, limiting their ability to improve iron loss and magnetic properties due to inadequate adhesion and coating tension.
Innovation Solution
A composition comprising magnesium oxide, aluminum hydroxide, and a boron compound is used to form an Al—Si—Mg composite coating on the steel sheet, enhancing adhesion and coating tension by diffusing into the oxide layer and improving thermal expansion coefficient differences, thereby reducing iron loss and improving magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional annealing separator materials are used, then manufacturing cost is reduced, but adhesion and coating tension are insufficient
Solution Approach 1:
The patent uses a composite annealing separator material consisting of magnesium oxide (70-90 wt%), aluminum hydroxide (5-20 wt%), and boron compound (0.1-5 wt%). This composite structure combines the high adhesion of magnesium oxide with the coating tension enhancement from aluminum hydroxide and boron compound, achieving both improved adhesion and workability without excessive cost increase.
Solution Approach 2:
The patent optimizes the compositional parameters of the annealing separator by precisely controlling the weight ratios of magnesium oxide, aluminum hydroxide, and boron compound. This parameter optimization ensures the material achieves sufficient adhesion and coating tension while maintaining cost-effectiveness and manufacturability.
2Strength
If expensive additives are introduced to improve adhesion, then coating tension is enhanced, but workability is considerably lowered
Solution Approach 1:
The patent replaces expensive rare earth elements with a cost-effective combination of magnesium oxide, aluminum hydroxide, and boron compound. This alternative composition achieves comparable or superior adhesion and coating tension properties while significantly reducing material cost and improving workability for actual production processes.
Solution Approach 2:
The patent changes the chemical composition parameters from conventional expensive additives to a optimized mixture of magnesium oxide, aluminum hydroxide, and boron compound. This parameter change maintains adhesion performance while dramatically improving workability and reducing cost.
3Temperature
If kaolinite is used as annealing separator, then mullite coating with low thermal expansion coefficient is formed, but coating property is poor due to insufficient adhesion
Solution Approach 1:
The patent creates a composite annealing separator system where magnesium oxide forms the base structure with aluminum hydroxide and boron compound as functional additives. This composite approach achieves both the desired thermal expansion properties and superior adhesion, overcoming the limitations of pure kaolinite-based systems.
Solution Approach 2:
The boron compound acts as an intermediary that enhances the interfacial bonding between the annealing separator and the steel sheet surface. This intermediary component improves adhesion and coating properties while maintaining the thermal expansion characteristics needed for high-quality electrical steel production.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a grain-oriented electrical steel sheet with improved iron loss reduction, enhanced adhesion, and insulation properties, leading to more efficient transformer performance with lower power dissipation.
Implementation Method 1
a forsterite (2MgO.SiO2) layer consisting of a reaction of silicon oxide (SiO2) produced on the surface of the material in primary recrystallization annealing process of the electric steel sheet material and magnesium oxide (MgO) used as an annealing separator
Implementation Method 2
improving the iron loss of the material by authorizing a tensile strength to the material due to the difference in thermal expansion coefficient between the material and the primary coating
Implementation Method 3
enhancing adhesion and coating tension by diffusing into the oxide layer
Data Source
AI summary
The present invention provides an annealing separator composition for a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet and a method for manufacturing a grain-oriented electrical steel sheet. An annealing separator composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: 100 parts by weight of at least one of magnesium oxide and magnesium hydroxide; 5 to 200 parts by weight of aluminum hydroxide; and 0.1 to 20 parts by weight of a boron compound.