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Annealing Process For Reducing Remanence Of Nanocrystalline Magnetic Cores

This paper deals with the technical field of high-frequency inverter power supply, specifically involving an annealing process to reduce the remanence of nanocrystalline magnetic core, including the following steps:

(1) The nanocrystalline strip is wound into a ring nanocrystalline magnetic core.

(2) Put the nanocrystalline magnetic core into the vacuum annealing furnace for heat treatment;

(3) Put the heat-treated nanocrystalline magnetic core into the vacuum annealing furnace for heat treatment again. In the annealing process of this paper, the nanocrystalline magnetic core to be heat treated is passed through the same heat treatment process twice by the annealing furnace of normal size to meet the electrical requirements of transverse magnetic furnace to reduce the residual magnetic of nanocrystalline magnetic core. The heat treatment process is simplified, the process is simple, the production equipment investment is reduced, and the power cost can be saved by more than 25%, and the production cost is low. The nanocrystalline magnetic core prepared by annealing process of the invention has stable permeability and DC bias ability, and has the advantages of high saturation magnetic induction intensity, low loss value, low coercivity, high temperature resistance, etc., and has excellent comprehensive performance.

The annealing process to reduce the remanence of nanocrystalline magnetic core is characterized by:
Include the following steps:
(1) The nanocrystalline strip is wound into a ring nanocrystalline magnetic core;

(2) Put the nanocrystalline magnetic core into the vacuum annealing furnace for heat treatment;

(3) Put the heat-treated nanocrystalline magnetic core into the vacuum annealing furnace for heat treatment again;

In step (1), the thickness of the nanocrystalline strip is 15-25μm and the width is 20-30mm. In step (1), the nanocrystalline strip is an iron base nanocrystalline strip, and the iron base nanocrystalline strip consists of the following elements by weight percentage: Ni: 15%-25%, Si: 10%-12%, B: 3%-5%, Nb: 2%-4%, Cu: 0.3%-0.5%, Co: 4%-8%, and the margin is Fe; Among them, in steps (2) and (3), the heat treatment steps are: a) after 110-130min, the furnace temperature rises from room temperature to 640-660K; b) After holding at 643-663K for 15-25min, heat up to 750-770K for 32-40min; c) Heat up to 790-810K for 11-15min after holding 753-773K for 35-45min; d) After holding at 793-813K for 55-65min, heat up to 825-845K for 10-14min; e) After holding temperature at 828-848K for 35-45min, the furnace body temperature is sharply cooled to 340-360K by strong wind of annealing cover, and the furnace door is opened to take out the nanocrystalline magnetic core; f) Put the nanocrystalline magnetic core taken out of the furnace on the cooling rack and then chill to room temperature with strong wind.

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