Water-gas combined atomization preparation method for iron-silicon-chromium-gallium-indium-nitrogen alloy soft magnetic powder

Abstract

The invention relates to a water-gas combined atomization preparation method for iron-silicon-chromium-gallium-indium-nitrogen alloy soft magnetic powder. The preparation method comprises the following steps that (1) a soft magnetic alloy powder raw material containing iron, silicon, chromium, gallium and indium is added into a medium-frequency induction furnace, and smelting is conducted by adopting argon blowing protection to obtain alloy liquid; and (2) under the nitrogen protection condition, the alloy liquid is poured into an atomizing tower in a negative pressure environment, two media including negative pressure overspeed gas and a high-pressure ammonia water solution act on an alloy liquid column flow in sequence, the alloy liquid column flow is dispersed and torn into metal liquid drops under the action of negative pressure supersonic speed gas, then the metal liquid drops are impacted and cooled through the high-pressure ammonia water solution, the metal liquid drops are further crushed and cooled into nearly-spherical alloy soft magnetic powder, and meanwhile, a compact oxidation film and a compact nitride film are formed on the surface of the alloy soft magnetic powder. The method can be used for preparing the alloy soft magnetic powder with high tap density, high surface resistivity and high loss characteristics, and the alloy soft magnetic powder can be widely applied as a powder raw material of inductor devices.

Description

technical field [0001] The invention relates to the technical field of soft magnetic alloy powder, and more specifically refers to a method for preparing soft magnetic powder of iron silicon chromium gallium indium nitrogen alloy combined with water and air atomization. Background technique [0002] At present, metal soft magnetic powder is usually mainly made of iron silicon chromium, which is made by chemical reaction method, melt atomization method, mechanical crushing method and point solution deposition method. Among them, alloy powder is prepared by melt atomization method It has the same chemical composition as the established molten alloy, and also has a typical rapid solidification structure, a wide range of alloy composition, good sphericity of powder shape, and wide particle size distribution. It is widely used in the production of metal soft magnetic powder. [0003] However, with the development of science and technology, the application of electronic components...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a water-gas combined atomization preparation method of iron-silicon-chromium-gallium-indium-nitrogen alloy soft magnetic powder to solve the problems of low tap density, low resistivity, poor electrical resistance and rust resistance existing in the existing metal soft magnetic powder. and defects such as low loss resistance