Soft magnetic powder, powder magnetic core, magnetic element, and electronic device

By using particles composed of FexCuaNbb(Si1-yBy)100-xab, combined with Fe-Si crystals, Cu segregation, and high-concentration grain boundaries, the stability problem of soft magnetic powder under high frequency and high current was solved, achieving low coercivity and high saturation magnetic flux density, which is suitable for pressed powder cores and magnetic components.

CN116403794BActive Publication Date: 2026-07-14SEIKO EPSON CORP
View PDF 3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SEIKO EPSON CORP
Filing Date
2022-12-30
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing soft magnetic powders are difficult to stably achieve excellent soft magnetic properties at high frequencies, and are prone to saturation at high currents, making it difficult to balance low coercivity and high saturation magnetic flux density.

Method used

The particles are composed of FexCuaNbb(Si1-yBy)100-xab, which contain Fe-Si crystals with a particle size of 1.0 nm or more and 30.0 nm or less, and Cu segregation with a particle size of 2.0 nm or more and 16.0 nm or less. The Cu segregation accounts for more than 80% of the particles, and the Nb and B concentrations at the grain boundaries are higher than those at the grains. Heat treatment promotes the formation of uniform grains.

Benefits of technology

It achieves low coercivity and high saturation flux density, reduces iron loss, adapts to high frequency and high current, and supports the miniaturization and high output of powder-pressed magnetic cores.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116403794B_ABST
    Figure CN116403794B_ABST
Patent Text Reader

Abstract

This application relates to soft magnetic powders, pressed powder cores, magnetic components, and electronic devices, providing soft magnetic powders that balance low coercivity and high saturation flux density, pressed powder cores and magnetic components containing such soft magnetic powders, and electronic devices that can achieve miniaturization and high output. One type of soft magnetic powder is characterized by comprising Fe... x Cu a Nb b (Si 1‑y B y ) 100‑x‑a‑b a, b, and x are numbers in atomic percent, satisfying 0.3 ≤ a ≤ 2.0, 2.0 ≤ b ≤ 4.0, and 75.5 ≤ x ≤ 79.5. Furthermore, y is a number satisfying f(x) ≤ y ≤ 0.99, where f(x) = (4 × 10⁻⁶) / ( ... ‑34 )x 17.56 The particles represented by 。 ] have the following characteristics: grains with a diameter of 1.0 nm or more and 30.0 nm or less, containing Fe-Si crystals; Cu segregation zones with a diameter of 2.0 nm or more and 16.0 nm or less, Cu segregation; and grain boundaries adjacent to the grains, with higher Nb and B concentrations than the grains, and the number ratio of Cu segregation zones being 80% or more.
Need to check novelty before this filing date? Find Prior Art