Electrical Steel Sheet Al Diffusion in Oxidizing Atmosphere
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Solution Overview
Problem
Existing methods for manufacturing electrical steel sheets with aluminum diffusion are costly and inefficient, particularly due to the need for vacuum equipment and high energy consumption in diffusion treatments.
Innovation Solution
A steel treatment method involving the formation of an aluminum-containing layer on the steel surface followed by diffusion treatment in an oxidizing atmosphere, which simultaneously forms an insulating oxide layer and creates a gradient Al concentration without requiring vacuum equipment, thus reducing costs and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If diffusion treatment is performed in a non-oxidizing atmosphere to create gradient Al concentration, then loss reduction is achieved, but manufacturing cost increases due to vacuum equipment requirements
Solution Approach 1:
The patent changes the atmosphere parameter from non-oxidizing (vacuum) to oxidizing atmosphere for diffusion treatment. This allows Al to diffuse into the steel sheet while simultaneously forming an insulating oxide layer on the surface, eliminating the need for vacuum equipment and reducing manufacturing costs while still achieving loss reduction
Solution Approach 2:
The patent merges two functions into one process: (1) diffusion of Al into the steel sheet to reduce loss, and (2) formation of insulating oxide layer on the surface. By performing diffusion treatment in an oxidizing atmosphere, both objectives are achieved simultaneously, eliminating the need for separate vacuum equipment and additional coating steps
2Loss of energy
If long-term high-temperature diffusion treatment is performed in oxidizing atmosphere to increase Al concentration, then loss reduction is achieved, but manufacturing time and energy consumption increase
Solution Approach 1:
The patent optimizes the diffusion treatment parameters by performing the treatment in an oxidizing atmosphere at controlled temperatures. The simultaneous formation of oxide layer and Al diffusion allows for shorter treatment times compared to conventional long-term high-temperature treatment, reducing both manufacturing time and energy consumption while achieving the desired Al concentration for loss reduction
3Manufacturing precision
If plating layer is formed by aluminizing treatment followed by diffusion, then Al concentration gradient is achieved, but device complexity increases due to multiple process steps
Solution Approach 1:
The patent combines the plating layer formation and diffusion treatment into a more integrated process. By forming an aluminum-containing layer and performing diffusion treatment in an oxidizing atmosphere, the process achieves Al concentration gradient while simultaneously creating an insulating oxide layer, reducing the number of separate steps and equipment needed compared to conventional multi-step processes
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 electrical steel sheets with appropriate aluminum diffusion at a lower cost and higher efficiency, maintaining magnetic properties while reducing iron loss and magnetic flux density decreases.
Implementation Method 1
diffusion treatment is performed in a non-oxidizing atmosphere to create a state in which the Al concentration is gradient from the surface
Implementation Method 2
performing diffusion treatment in an oxidizing atmosphere on steel for an electrical steel sheet with an aluminum-containing layer formed on a surface of the steel
Data Source
AI summary
An electrical steel sheet in which Al is appropriately diffused is manufactured at a relatively low cost. Disclosed is a steel treatment method including performing diffusion treatment in an oxidizing atmosphere on steel for an electrical steel sheet with an aluminum-containing layer formed on a surface of the steel. The steel preferably contains Si at more than 0.00 mass % and 7.00 mass % or less, and Al at more than 0.00 mass % and 2.00 mass % or less. The aluminum-containing layer is preferably in the form of a plating layer having a thickness of 2 μm or more and 30 μm or less. The composition of the plating layer includes Al, and may further contain another element such as Fe. The diffusion treatment is preferably performed under a treatment condition for obtaining a change gradient in which the Al concentration gradually decreases from the surface of the steel toward the inside.