A hot pressing method for forming amorphous soft magnetic powder

By combining stress-relief heat treatment with hot pressing, the problems of high internal stress and low density in amorphous alloy powder were solved, achieving high density and uniformity, and improving the magnetic properties and pressing efficiency of amorphous soft magnetic powder.

CN121565674BActive Publication Date: 2026-05-26HUICI (JIAXING) NEW MATERIALS CO LTD
View PDF 5 Cites 0 Cited by

Patent Information

Application Number
CN202610069992.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-20
Publication Date
2026-05-26
Estimated Expiration
2046-01-20

AI Technical Summary

Technical Problem

In existing technologies, amorphous alloy powders have high internal stress, high pressing pressure, low relative density, and unstable magnetic properties, making it difficult to achieve high density and uniform structure in the molding of amorphous soft magnetic powders under low pressure.

Method used

The amorphous soft magnetic powder is heated to a specific temperature under a protective atmosphere for stress relief heat treatment. Then, it is hot-pressed in a mold at a temperature lower than or equal to the glass transition temperature. Combined with a sintering step, this ensures that the powder temperature is uniform and reduces internal stress.

Benefits of technology

It significantly reduces the pressing pressure, increases the relative density to over 90%, improves magnetic permeability and greatly reduces iron loss, achieving uniformity and stability of material properties, making it suitable for high-performance pressing of large-size and complex-shaped magnetic components.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121565674B_ABST
    Figure CN121565674B_ABST
Patent Text Reader

Abstract

This invention discloses a hot pressing method for forming amorphous soft magnetic powder, wherein the amorphous powder is granulated and heat-treated under a protective atmosphere to a specific temperature. T x -150℃ to T x -50℃ and hold for 5–90 minutes; then transfer the powder to a mold, and... T g to T x High-density molded bodies are obtained by hot pressing for 30–180 seconds at a gauge pressure of 100–600 MPa within a temperature range. After sintering, high-density amorphous soft magnetic powder cores can be obtained. This method significantly reduces the gauge pressure, increases the relative density, improves the magnetic permeability, and reduces iron loss. Furthermore, the process is highly adaptable, can be easily modified from conventional powder metallurgy equipment, and offers high controllability, making it suitable for the industrial-scale preparation of high-performance amorphous soft magnetic materials.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • High-density amorphous soft magnetic composite material and preparation method thereof

    CN116313480A

  • Amorphous magnetic powder core and preparation method thereof

    CN117198731A

  • Amorphous nanocrystalline magnetic powder core preparation method based on hot pressing process

    CN120072501A

  • High-density amorphous powder core inductor and preparation method thereof

    CN117542648A

  • Magnetic powder core and hot-pressing preparation method and application thereof

    CN120933015A