A kind of granulation method of superfine and nanometer soft magnetic ferrite powder

Abstract

The invention provides a granulation method for ultrafine and nano soft magnetic ferrite powder. According to the method, rolling equipment, a crushing machine, turntable stirring and rolling equipment and a vibration sieve group are adopted. The method comprises the steps of putting the ultrafine and nano soft magnetic ferrite powder into a powder storage bin for rolling, crushing the powder through the crushing machine, putting the powder into the turntable stirring and rolling equipment for granulation through a material inlet, putting granulated particles into a material receiving hopper, and putting the particles into the vibration sieve group for screening through a material outlet. The soft magnetic ferrite particles obtained by the granulation method provided by the invention can be used for a subsequent pressing technology for soft magnetic ferrite magnet production; the whole process is executed in a closed and continuous manner; the granulation method has the characteristics of reasonable design, simple equipment, easiness in control, suitability for industrial production and the like.

Description

Technical field [0001] The invention belongs to the field of powder metallurgy, and particularly relates to a method for granulating ultrafine and nano soft ferrite powder. Background technique [0002] Soft ferrite is based on Fe 2 O 3 The main components of ferrimagnetic oxides include Mn-Zn, Cu-Zn, Ni-Zn and other series, among which Mn-Zn ferrite has the largest output and consumption. Soft ferrite has the advantages of high saturation magnetic flux density, high permeability, low medium and high frequency loss, low cost, etc., and is widely used in many fields such as household appliances, network communications, automotive electronics, aerospace and military industry. [0003] The production process of soft ferrite adopts powder metallurgy, that is, through mixing, granulating, pressing, sintering and other processes. Among them, the granulation of ferrite powder is a more critical step in the powder metallurgy process. The granulation is to use powder as the main raw materi...

AI Technical Summary

Problems solved by technology

However, in recent years, the preparation of ultrafine and nano soft ferrite powder has become a hot spot, such as ultrafine and nano soft ferrite powder using high energy ball milling method, sol-gel method, hydrothermal method, chemical co-precipitation method and other indicators , which has the advantages of fine powder particle size, uniform distribution, large surface area, and high activity, but ultrafine and nano soft ferrite powders also have the disadvantages of poor fluidity, poor formability, low bulk density, and poor compressibility, which are not conducive to the next step. Compression process, so must be granulated

Images