Low-loss ultrafine soft magnetic alloy powder, its manufacturing method and application

Abstract

This invention discloses low-loss ultrafine soft magnetic alloy powder, its manufacturing method, and its applications, belonging to the field of soft magnetic materials technology. Specifically, it involves melting iron, nickel, manganese, aluminum, silicon, and chromium into an alloy, preparing ultrafine alloy powder via evaporation and condensation; then, firstly, coating the surface of the ultrafine alloy powder with a phosphating film using a medium-temperature zinc-manganese phosphating solution and phosphating aids, followed by coating with a silicon dioxide layer to obtain the coated low-loss ultrafine soft magnetic alloy powder. The phosphating aids include at least sodium sulfonate derivatives. In the preparation of the sodium sulfonate derivatives, nonadichloroethylene chloride and 1-octen-3-ol are reacted first, followed by the addition of sodium bisulfite to obtain the sodium sulfonate derivative. The low-loss ultrafine soft magnetic alloy powder prepared by this invention has a D50 particle size of 100-3000 nm; high resistivity, reaching above 9.0 Ω·cm; and low power loss, below 320.3 mW / cm³, making it suitable for preparing high-performance inductors.

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