Method for preparing iron-based nanocrystalline material by mid-low-frequency magnetic pulse

Abstract

The invention relates to the technical field of the preparation of soft magnetic materials, in particular to a method for preparing an iron-based nanocrystalline material by a mid-low-frequency magnetic pulse. The method comprises the following steps: at a vacuum degree below 5*10<-3>Pa, smelting alloy materials into a mother alloy molten mass in a vacuum high-frequency furnace or arc furnace; then, at a vacuum degree of 2*10<-3>Pa, injecting the mother alloy molten mass into a vacuum single-roller molten mass rapid-cooling device under the protection of an argon gas atmosphere, and preparing the mother alloy into an amorphous thin strip, wherein the linear surface velocity of a cooling roller is 45-49m/s, the distance between a quartz nozzle and a copper roller is 0.5mm, the superheating temperature of the molten mass at the outlet of the nozzle is 50K; and finally, carrying out magnetic pulse treatment on the amorphous thin strip in a multi-function process control pulse magnetic field generator to obtain the amorphous nanocrystalline material, wherein the field intensity Hp of the magnetic pulse is 100-400Oe, the frequency f is 20-2000Hz, and the operation time tp is 5-10 minutes.

Description

A method for preparing iron-based nanocrystalline materials by medium and low frequency magnetic pulses technical field The invention relates to the technical field of preparation of soft magnetic materials, in particular to a method for preparing iron-based nanocrystalline materials through medium and low frequency magnetic pulses. Background technique The iron-based nanocrystalline material is a dual-phase nanoalloy in which the nanocrystals obtained after the nanocrystallization treatment of the iron-based amorphous are dispersed in the remaining amorphous matrix. It has good soft magnetic properties, that is, low coercive force and high saturation magnetization, and is widely used in power transformers, switching power supplies, sensitive sensors and other fields. In particular, the nano-alloy-HITPERM formed by FeCoHfBCu amorphous nanocrystallization has high high-temperature magnetic induction, low coercive force, and the working temperature can reach above 500 ° C. I...

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Problems solved by technology

This process is complicated, the reaction time is long, and it is easy to cause annealing embrittlement of iron-based nanocrystalline materials.

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