Soft Magnetic Powder Distribution for Low-Loss Dust Core Molding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of dust cores for electronic components faces challenges with soft magnetic materials having wide particle size distributions, leading to decreased fluidity and increased material loss, which affects production efficiency and yield.
Innovation Solution
A soft magnetic material with a particle size frequency distribution having multiple peak tops, including a medium powder-particle substance with a particle size of 45 μm to 300 μm and an average circularity of 0.7 or more, which enhances fluidity without the need for uniform particle sizing, thereby reducing material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the particle size distribution of soft magnetic material is narrowed by classification to increase fluidity, then fluidity is improved, but material loss increases and yield decreases
Solution Approach 1:
The invention changes the particle size distribution parameters by specifying a multi-peak frequency distribution with controlled proportions. Instead of narrowing the distribution, it optimizes the width and shape by defining that 80-95% of particles fall within 45-300 μm range, with specific peak configurations, thereby achieving high fluidity without classification-induced material loss
Solution Approach 2:
The invention applies local quality by creating specific regions in the particle size distribution with different characteristics. The multi-peak frequency distribution creates distinct particle size regions (peaks) that serve different functions: larger particles provide structural integrity while smaller particles fill voids, collectively achieving high fluidity and low material loss
2Quantity of substance
If granulated powder with larger target particle size is produced, then the amount of soft magnetic material used increases, but the particle size distribution becomes wider and fluidity decreases
Solution Approach 1:
The invention changes the particle size distribution parameters by specifying a multi-peak frequency distribution with controlled proportions. Instead of narrowing the distribution, it optimizes the width and shape by defining that 80-95% of particles fall within 45-300 μm range, with specific peak configurations, thereby achieving high fluidity without classification-induced material loss
Solution Approach 2:
The invention creates a dynamic particle size distribution system where multiple peaks represent different particle size populations that work together. The distribution is designed to be adaptable, with the medium powder-particle substance (45-300 μm) forming the base and smaller particles filling gaps, creating a self-adjusting flow characteristic
3Quantity of substance
If the particle size distribution is wide, then more material can be used, but production efficiency and yield decrease due to uneven loading in mold
Solution Approach 1:
The invention changes the particle size distribution parameters by specifying a multi-peak frequency distribution with controlled proportions. Instead of narrowing the distribution, it optimizes the width and shape by defining that 80-95% of particles fall within 45-300 μm range, with specific peak configurations, thereby achieving high fluidity without classification-induced material loss
Solution Approach 2:
The invention achieves functional homogeneity through controlled heterogeneity. By defining a specific multi-peak distribution where 80-95% of particles are within 45-300 μm and controlling the relative proportions of different size ranges, it creates a uniformly flowing material that loads evenly into molds, despite the presence of multiple particle size populations
Data Source
AI summary
A soft magnetic material according to an aspect of the present invention includes a powder-particle substance having a particle size frequency distribution having a plurality of peak tops. The powder-particle substance is an aggregate of composite particles containing a plurality of soft magnetic metal particles and includes a medium powder-particle substance in which the composite particles have a particle size of 45 μm or more and less than 300 μm, and the medium powder-particle substance has an average circularity of 0.7 or more.