Grain-oriented electrical steel sheet forsterite coating adhesion
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Solution Overview
Problem
The existing manufacturing processes for oriented electrical steel sheets face challenges in maintaining excellent adhesion between the forsterite coating and the base steel sheet, particularly after forming grooves, which can lead to deteriorated insulation and corrosion resistance due to excessive stress concentration and separation of the coating layer.
Innovation Solution
A method involving the formation of a forsterite coating with a 3D network structure that penetrates into the base steel sheet, enhancing bonding force and adhesion, while also optimizing the composition and processing conditions to control residual stress around the groove formation area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If grooves are formed on the surface of the electrical steel sheet to refine magnetic domains, then iron loss is reduced and magnetic characteristics are improved, but excessive stress concentrates at the groove portions causing the coating layer to separate and adhesion to deteriorate
Solution Approach 1:
The invention changes the physical-chemical parameters of the coating layer by controlling the formation of forsterite crystals with specific crystal orientations (<100> and <110>) and adjusting the coating thickness (1-5 μm). This parameter optimization allows the coating to maintain adhesion even when grooves are formed, resolving the contradiction between magnetic domain refinement and coating adhesion.
Solution Approach 2:
The invention creates a composite structure where the coating layer contains forsterite crystals embedded in a glass phase matrix. This composite material structure provides both the stress-absorbing capability needed for groove formation and the adhesion strength needed to prevent coating separation, simultaneously achieving magnetic domain refinement and maintaining reliability.
2Strength
If a forsterite coating is formed on the surface to improve adhesion and magnetic characteristics, then bonding force is enhanced, but the coating process and composition control become more complex
Solution Approach 1:
The invention specifies precise compositional parameters for the coating layer (forsterite content, glass phase composition, coating thickness) and process parameters (heating temperature range of 900-1300°C, heating time) to achieve the desired forsterite crystal formation. These parameter specifications provide a clear, controllable process that enhances bonding force without excessive complexity.
3Reliability
If the coating layer is made thinner to reduce stress concentration, then adhesion is improved, but the protective and insulating properties of the coating are reduced
Solution Approach 1:
The invention creates a composite coating structure where forsterite crystals (提供 adhesion and stress management) are embedded in a glass phase matrix (提供 insulation and corrosion resistance). This composite structure allows the coating to be thin (1-5 μm) while maintaining both adhesion and protective properties, resolving the contradiction between adhesion improvement and protective property maintenance.
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
This approach results in improved iron loss characteristics and enhanced adhesion between the forsterite coating and the base steel sheet, ensuring excellent insulation and corrosion resistance even after stress relaxation annealing.
Implementation Method 1
excellent adhesion with a coating layer applied after forming the groove by residual stress of a forsterite layer around a groove formation portion
Implementation Method 2
a method of irradiating a laser is preferred
Implementation Method 3
after the secondary recrystallization annealing is performed, planarization annealing is selectively performed
Implementation Method 4
a fosterite film is formed on the surface of a steel sheet according to a kind of annealing separator
Data Source
AI summary
Provided is an oriented electrical steel sheet including a groove existing on the surface of the electrical steel sheet and a forsterite layer formed on a part or all of the surface of the electrical steel sheet, in which forsterite which is extended from the forsterite layer and penetrates to a base steel sheet in an anchor form is present on the surface of the side of the groove.