Composite Magnetic Material Recessed Oxide Adhesion
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Solution Overview
Problem
Conventional composite magnetic materials lack sufficient mechanical strength, particularly in applications like vehicle coil components, where reliability is crucial.
Innovation Solution
A composite magnetic material comprising soft-magnetic metal powders coated with a first oxide having recesses, where a second oxide is filled in these recesses, enhancing adhesion and mechanical strength while maintaining magnetic characteristics by sharing common elements like Al, Cr, Ti, Mg, Ni, and Ca between the powders, oxide layers, and ferrite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional composite magnetic material structure is used (first oxide diffusion layer on soft-magnetic metal powder surface, second oxide ferrite material on first oxide surface), then mechanical strength can be improved, but adhesion between oxide layers is insufficient leading to peeling
Solution Approach 1:
The first oxide layer is formed as a diffusion layer on the soft-magnetic metal powder surface before the second oxide layer is applied. This preliminary formation creates a chemically active surface that enhances subsequent adhesion. The recesses in the first oxide layer are prepared in advance to receive the second oxide, ensuring proper interlocking before final assembly.
Solution Approach 2:
The invention uses a composite structure with three distinct layers: soft-magnetic metal powder core, first oxide diffusion layer, and second oxide ferrite material outer layer. Each layer serves a specific function - the metal powder provides magnetic properties, the first oxide layer provides adhesion and chemical bonding, and the second oxide layer provides mechanical strength. The recesses in the first oxide layer create a composite interlocking structure that prevents peeling.
2Strength
If oxide layers are formed to improve mechanical strength, then peeling between layers occurs, but magnetic characteristics deteriorate
Solution Approach 1:
The oxide layers are formed with specific local properties - the first oxide layer has a diffusion structure that provides chemical bonding, while the second oxide layer has ferrite material properties that maintain magnetic characteristics. The recesses are locally formed in the first oxide layer to provide mechanical interlocking without affecting the overall magnetic properties of the soft-magnetic metal powder core.
3Ease of manufacture
If a simple oxide coating is applied on soft-magnetic metal powder, then manufacturing is simple, but mechanical strength is insufficient for vehicle applications
Solution Approach 1:
The first oxide diffusion layer is formed as a preliminary step before applying the second oxide layer. This two-stage oxidation process is still relatively simple to manufacture but provides superior mechanical strength compared to single-layer coatings. The recesses are formed during the first oxide formation process, integrating the complex structure into a manageable manufacturing sequence.
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 enhanced adhesion area between oxide layers significantly improves mechanical strength and maintains high magnetic characteristics, ensuring reliability in vehicle applications without compromising magnetic performance.
Implementation Method 1
first oxide 2 (diffusion layer) is formed on a surface of soft-magnetic metal powder 21
Implementation Method 2
second oxide 23 (ferrite material) is formed on a surface of first oxide 22 (diffusion layer), so that mechanical strength can be improved
Data Source
AI summary
A composite magnetic material includes a plurality of soft-magnetic metal powders, a first oxide that covers a surface of each of the plurality of soft-magnetic metal powders, and a second oxide that covers a surface of the first oxide and is interposed among the plurality of soft-magnetic metal powders each coated with the first oxide. The first oxide has a first recess in a surface, and the second oxide is provided in the first recess. With this configuration, peeling between the first oxide and the second oxide can be prevented, so that the composite magnetic material having high mechanical strength can be provided.