Magnetic substrate and coil component including magnetic substrate
By optimizing the thickness ratio of silica and chromium/alumina oxide films through controlled heat treatment, the magnetic substrate achieves enhanced insulation and permeability, addressing the insulation challenges in conventional magnetic substrates.
Patent Information
- Application Number
- JP2024056473
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-10-10
AI Technical Summary
Conventional magnetic substrates using oxide films for insulation on metal magnetic particles face challenges with insufficient insulation and magnetic permeability due to uneven oxide film thickness, particularly with Cr oxide films being thicker than Si oxide films, leading to inadequate electrical insulation between particles.
A magnetic substrate design with a thicker first oxide film primarily composed of silica and a thinner second oxide film primarily composed of chromium oxide or alumina, ensuring improved insulation by controlling the heat treatment process to enhance the thickness of the silica-based oxide films relative to chromium or alumina films.
The design achieves improved insulating properties and magnetic permeability by optimizing the thickness ratio of silica and chromium/alumina oxide films, enhancing electrical insulation and filling rate of metal magnetic particles within the substrate.