Textured Electrical Steel Sheet via Particle Alignment
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Solution Overview
Problem
Existing methods for producing electrical steel sheets face challenges in achieving mechanically stable and magnetically anisotropic structures due to the agglomeration of uniaxially magnetized iron particles during additive manufacturing, which impede layer formation and alignment, and the brittleness of soft magnetic sintered metals limits directed flux guidance.
Innovation Solution
A method involving the application of a paste containing iron oxides or hydroxides on a carrier plate, aligning particles in a predetermined magnetic flux direction, followed by solvent removal and reduction in a reductive atmosphere to create a textured iron structure with anisotropic properties through sintering, while using additives to enhance mechanical strength and anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniaxially magnetized iron particles are used in additive manufacturing, then magnetic anisotropy is improved, but particle agglomeration occurs which impedes layer formation and alignment
Solution Approach 1:
The patent changes the magnetic state parameter of iron particles from ferromagnetic to superparamagnetic, which eliminates strong magnetic moment and prevents agglomeration while maintaining alignment capability during the printing process
Solution Approach 2:
The patent introduces a binder as an intermediary material that facilitates layer formation and provides mechanical stability during printing, allowing particles to be deposited in controlled layers without direct particle-to-particle contact that would cause agglomeration
2Adaptability or versatility
If soft magnetic sintered metals are used, then complex shapes can be produced, but mechanical stability is insufficient due to brittleness
Solution Approach 1:
The patent creates a composite structure by combining superparamagnetic iron particles with a binder material, forming a mechanically stable composite that overcomes the brittleness of sintered metals while maintaining shape complexity capabilities
Solution Approach 2:
The patent changes the magnetic properties parameter by using superparamagnetic particles instead of ferromagnetic particles, which eliminates magnetic domain wall movements that cause magnetostriction and mechanical stress, thereby improving mechanical stability
3Manufacturing precision
If iron particles are aligned during deposition, then magnetic anisotropy is improved, but mechanical stability deteriorates due to lack of fixation
Solution Approach 1:
The binder acts as an intermediary that fixes the aligned iron particles in their oriented positions, providing mechanical stability while preserving the magnetic anisotropy achieved during alignment
Solution Approach 2:
The patent performs particle alignment during the deposition process before the binder fully sets, ensuring that particles are oriented in the desired magnetic flux direction and then fixed in place by the binder
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 method enables the production of a textured metal sheet with magnetically anisotropic properties, improving mechanical stability and flux guidance, and is cost-efficient by integrating texturing in the alloy's preliminary stage, maintaining anisotropic microstructure and shape anisotropy.
Implementation Method 1
removing the solvent by heating
Implementation Method 2
reducing the particles to iron by removing the oxygen of the iron oxide or the hydroxyl group of the iron hydroxide in a reductive atmosphere
Implementation Method 3
providing the electrical steel sheet by sintering the aligned particles
Implementation Method 4
aligning the particles in direction of a predetermined magnetic flux direction
Data Source
Figure 1~2
AI summary
The invention discloses a method for producing an electrical steel sheet (4) comprising the steps of: a) applying (S1) a paste to the surface of a substrate, wherein the paste contains antiferromagnetic, ferrimagnetic and/or weakly ferromagnetic particles and a solvent, b) aligning (S2) the particles in the direction of a predetermined magnetic flux direction, c) removing the solvent (S3) by heating, d) providing (S5) the electrical steel sheet (4) by sintering the aligned particles, and e) separating (S6) the electrical steel sheet (4) from the substrate. The invention also discloses an electrical steel sheet (4) and an electrical machine (1).