Double-vacuum annealing device and process for improving magnetic property of soft magnetic material

Abstract

The invention discloses a double-vacuum annealing device and process for improving magnetic property of a soft magnetic material. The double-vacuum annealing device comprises two vacuum furnace chambers (a main chamber and an assistant chamber), a heating device and a vacuum pump set, and a soft magnetic material with good magnetic property, corrosion resistance and mechanical property is obtained through a heat treatment process of nitridation at low temperature and vacuum annealing at high temperature. The vacuum annealing device provided by the invention has the advantages that the heating device of the double-vacuum annealing device is arranged in the assistant chamber and directly sleeved on the outer surface of the main chamber, the heating unit can be used for not only preserving heat and saving energy but also keeping the main chamber clean and conveniently controlling and adjusting the temperature; the nitriding at 500-550 DEG C and the heat treatment process of the vacuum annealing at high temperature are adopted so as to solve the problem that the existing annealing and nitriding process causes magnetic characteristic to get better firstly and then get worse; in a nitriding process, hydrogen is generated through ammonia gas thermal decomposition, the hydrogen is reducing gas, and harmful impurities in a sof tmagnetic material substrate are reduced, thus the magnetic property is improved; and the soft magnetic material nitriding is not influenced by an oxidation film, the nitriding is uniform, and the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of metal soft magnetic materials, and provides a double vacuum annealing device and process for improving the magnetic properties of soft magnetic materials, which are suitable for various types of heat treatment that require both good magnetic properties and excellent corrosion resistance and mechanical properties of soft magnetic materials. Background technique [0002] Ferromagnetic materials with low coercivity and high permeability are called soft magnetic materials. Because of the small coercive force, soft magnetic materials are easy to magnetize and demagnetize, and have low hysteresis loss. They are suitable for use in alternating magnetic fields, and are widely used in the manufacture of electromagnets, transformers, motors, and cores of high-frequency electromagnetic components. For electrical equipment and electronic equipment. Commonly used soft magnetic materials are: electrical pure iron, si...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a double vacuum annealing device and process for improving the magnetic properties of soft magnetic materials, so as to solve the problem that the magnetic properties of soft magnetic materials first become better and then deteriorate in the existing heat treatment process of annealing first and then nitriding. Soft magnetic materials with excellent magnetic properties, corrosion resistance and mechanical properties are prepared by the heat treatment process of low temperature nitriding followed by high temperature vacuum annealing

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