Magnetic Particle Coating to Prevent Sintering During Heating
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Solution Overview
Problem
Existing methods for manufacturing magnetic particles for magnetic recording struggle to simultaneously reduce particle size and coercive force, as heating processes often lead to sintering and aggregation, hindering further size reduction.
Innovation Solution
A method involving a glass component adhering treatment, where a glass component is partially coated on the magnetic particles before a coercive force-reducing treatment with heating, preventing sintering and allowing for both size reduction and coercive force adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If heating treatment is applied to reduce coercive force, then coercive force is reduced, but particle size increases due to sintering and aggregation
Solution Approach 1:
A glass component is introduced as an intermediary substance that adheres to the surface of magnetic particles during heating treatment. This glass component acts as a physical barrier that prevents direct contact and sintering between particles while allowing the heating process to proceed, thus reducing coercive force without causing particle aggregation.
Solution Approach 2:
The glass component is applied to the particle surface before heating treatment to preemptively prevent sintering. By establishing this protective layer in advance, the harmful sintering effect is counteracted before it can occur during the coercive force reduction process.
2Volume of moving object
If glass component is completely coated on magnetic particles to prevent sintering, then sintering is prevented, but coercive force cannot be reduced due to blocking of heating effect
Solution Approach 1:
Instead of uniform complete coating, the glass component is applied in a controlled manner to provide localized protection. The coating density and distribution are optimized to provide sufficient sintering prevention while maintaining adequate heat penetration and magnetic field interaction, allowing both size reduction and coercive force reduction to occur.
Solution Approach 2:
Rather than applying a complete thick coating that would block all heating effects, a partial or optimized thickness of glass component is applied. This partial action provides just enough protection against sintering while allowing the necessary thermal and magnetic effects to penetrate and achieve coercive force reduction.
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 enables the production of magnetic particles with reduced coercive force and smaller size, improving recording properties while maintaining thermal stability, with coercive force suited for magnetic recording applications.
Implementation Method 1
subjecting starting material magnetic particles to glass component-adhering treatment to be adhered with a glass component
Implementation Method 2
subjecting the magnetic particles after the glass component-adhering treatment to coercive force-reducing treatment with heating
Data Source
AI summary
The method of manufacturing magnetic particles, wherein the magnetic particles are magnetic particles for magnetic recording, and includes subjecting starting material magnetic particles to glass component-adhering treatment to be adhered with a glass component, and subjecting the magnetic particles after the glass component-adhering treatment to coercive force-reducing treatment with heating, to provide magnetic particles having lower coercive force than the starting material magnetic particles.