Platy Ferrite Protrusions Enhance Resin Dispersion and Shielding
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Solution Overview
Problem
Existing methods struggle to achieve high dispersibility and electromagnetic shielding characteristics in resin compositions containing platy ferrite particles at higher filler content, as the resin fails to sufficiently spread into voids between the particles, limiting their orientation and dispersion.
Innovation Solution
The use of platy ferrite particles with protrusions on their surfaces, having a spinel crystal structure, which enhances dispersibility and electromagnetic shielding properties by allowing the resin to fill voids effectively and maintain high orientation, even at higher filler content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platy ferrite particles are used at higher filler content in resin compositions, then electromagnetic shielding characteristics are improved, but the resin cannot sufficiently spread into voids between particles, limiting orientation and dispersion
Solution Approach 1:
The invention introduces protrusions at specific locations on the ferrite particle surfaces. These local structural features (protrusions) enable the resin to penetrate into the spaces between particles more effectively, improving dispersibility and maintaining particle orientation even at high filler contents, thereby resolving the contradiction between shielding performance and processing ease
Solution Approach 2:
The ferrite particles are designed with asymmetric protrusions rather than uniform spherical shapes. This asymmetric geometry creates interlocking effects and prevents random aggregation, allowing better resin penetration and maintaining oriented arrangement of particles, which simultaneously improves both electromagnetic shielding characteristics and dispersibility
2Reliability
If ferrite particles are oriented to prevent leakage of electromagnetic waves, then shielding performance is improved, but the resin cannot sufficiently spread into voids between particles
Solution Approach 1:
The invention utilizes the void spaces between oriented ferrite particles as a beneficial feature rather than a defect. By designing particles with protrusions, the resin can penetrate and fill these voids, creating a composite structure that maintains the oriented arrangement necessary for shielding performance while eliminating the harmful empty spaces through resin infiltration
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 approach results in a powdered ferrite with high electromagnetic shielding characteristics and flexibility, enabling the production of resin compositions and electronic components with improved performance and durability, including the ability to form curved surfaces without surface oxidation.
Implementation Method 1
Ferrite materials have high magnetic permeability, and have been used as electromagnetic wave absorbing materials or electromagnetic shielding materials
Implementation Method 2
the electromagnetic wave absorbing region ranges over a region higher than the natural resonant frequency
Data Source
AI summary
The present invention provides a powdered ferrite having high dispersibility in a resin and high electromagnetic shielding characteristics. The powdered ferrite comprises platy ferrite particles having a spinel crystal structure. The powdered ferrite comprises at least 50 number % platy ferrite particles each having at least one protrusion on a surface of the particle, and the protrusion has a shape selected from the group consisting of a rectangular pyramid, a truncated rectangular pyramid, an elongated rectangular pyramid, and combinations thereof.