Electrical Steel Strip Coating With Nanometric Pretreatment Layer
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Solution Overview
Problem
Existing coating processes for electrical steel strips face challenges in achieving thin insulating lacquer layers with good adhesion and ageing resistance, particularly on highly alloyed steel strips, which affects the efficiency and insulation performance of electric cores.
Innovation Solution
A process involving the application of a thin pretreatment layer (10-100 nm) followed by an insulating lacquer layer without deliberate drying or crosslinking, improving adhesion and insulating strength, and allowing for reduced total coating thickness while maintaining efficiency and dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the insulating lacquer layer thickness is reduced to increase electrically effective volume, then efficiency of electric core is improved, but insulation performance and adhesion may be compromised
Solution Approach 1:
A pretreatment layer is applied to the electrical steel strip before the insulating lacquer layer to prepare the surface in advance. This preliminary action ensures that even when the insulating lacquer layer is made very thin, it maintains good adhesion and insulation performance, thus resolving the contradiction between reducing thickness for efficiency and maintaining reliability.
Solution Approach 2:
The pretreatment layer acts as an intermediary between the electrical steel strip and the insulating lacquer layer. It provides a suitable surface that enhances adhesion of the thin insulating lacquer layer, enabling both thin coating thickness and reliable insulation performance to be achieved simultaneously.
2Strength
If cleaning processes are applied to improve adhesion of the insulating lacquer layer, then adhesion is improved, but process complexity and production time increase
Solution Approach 1:
The pretreatment layer is applied as a preliminary step that inherently prepares the surface for good adhesion without requiring separate cleaning operations. This preliminary coating action simplifies the overall process while ensuring strong adhesion of the insulating lacquer layer.
Solution Approach 2:
The invention changes the surface parameters by applying a pretreatment layer with specific properties (thickness of 10-100 nm, specific composition) that creates optimal adhesion conditions. This parameter change eliminates the need for complex mechanical or chemical cleaning processes.
3Strength
If a pretreatment layer is applied to improve adhesion and insulation, then adhesion and ageing resistance are improved, but total coating thickness increases
Solution Approach 1:
The pretreatment layer is applied with a very specific local thickness of 10-100 nm, which is sufficient to provide the necessary surface properties for adhesion and ageing resistance but thin enough to minimize the total coating thickness. This local quality control ensures optimal balance between performance and thickness.
Solution Approach 2:
By precisely controlling the thickness parameter of the pretreatment layer within the narrow range of 10-100 nm, the invention achieves the dual goal of improving adhesion while keeping the total coating thickness minimal. The parameter optimization resolves the contradiction between strength and length.
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 process enhances adhesion, ageing resistance, and insulating performance of the lacquer layer, reducing the total coating thickness and improving the efficiency of electric cores produced from the electrical steel strip.
Implementation Method 1
application of a pretreatment layer over a first flat side of a rolled electrical steel strip, where the layer thickness of the pretreatment layer is in the range from 10 to 100 nm
Data Source
AI summary
A process for producing a coated electrical steel strip includes application of a pretreatment layer over a first flat side of a rolled electrical steel strip. The layer thickness of the pretreatment layer is in the range from 10 nm to 100 nm, in particular from 20 nm to 50 nm. The rolled electrical steel strip which has been coated with the pretreatment layer is then coated with an insulating lacquer layer over the pretreatment layer. The insulating lacquer layer is applied by roll application using a roll and no deliberate drying and/or crosslinking of the pretreatment layer is carried out after application of the pretreatment layer and before coating with the insulating lacquer layer.