Vacuum annealing method for magnetic material

Abstract

The invention provides a vacuum annealing method for a magnetic material. The method adopts vacuum heat treatment equipment to carry out vacuum quenching with the vacuum degree of less than 6.67 * 10<-3> Pa. In order to ensure slow release of thermal stress and other stresses of the material, the room temperature is heated to 800 DEG C in the heating process, slow heating is carried out for 100 minutes, and slow cooling is carried out for 0.8-1 hour in the cooling process of 700-500 DEG C; and in order to ensure that the magnetic properties of the material meet the index requirements, heat preservation is carried out for 2 hours at 800-900 DEG C, heat preservation is carried out for 3-4 hours at 900 DEG C, and heat preservation is carried out for 2-4 hours in the cooling process at 900-700 DEG C. According to the method, large stress concentration at the position, prone to deformation, of the electromagnetic pure ferromagnetic material of a complex structure in the vacuum heat treatment process is prevented, meanwhile, it can be guaranteed that the magnetic performance of the material meets technological parameters of indexes, the deformation amount of the electromagnetic pure ferromagnetic material of the complex structure after heat treatment can be well controlled, the heat treatment procedure machining time is shortened, and energy conservation, consumption reduction and green and clean production are realized.

Description

technical field [0001] The invention belongs to the technical field of magnetic material processing methods, and in particular relates to a magnetic material vacuum annealing method. Background technique [0002] Electromagnetic pure iron is an iron-based soft magnetic alloy with a very low carbon content. Because of its high saturation magnetic induction, low coercive force, high magnetic permeability, good cold and hot processing performance, and low price, it is widely used in electrical appliances, telecommunications, electronics, aviation and other industrial fields. However, due to its low resistivity and easy aging, it cannot be used as an electrical material under an alternating magnetic field, and is generally used as a magnetic material under a constant magnetic field. When manufacturing permanent magnets, it is necessary to choose materials with high coercive force. The manufacture of iron cores, yokes, etc. requires materials with low coercive force such as ele...

AI Technical Summary

Problems solved by technology

However, due to the unique strictness of the electromagnetic pure iron process and the complexity of the product characteristics of the welding structure of dissimilar materials, the production is carried out according to the vacuum annealing process for magnetic materials recommended by GB6983-2008, and the magnetic properties, especially the coercive force, have failed many times.

At present, the vacuum heat treatment process of the welding structure of electromagnetic pure ferromagnetic materials dissimilar materials, in the process of vacuum heat treatment, due to the inconsistent thermal expansion rate of dissimilar materials, coupled with the release of welding and machining stress during the heating process, the deformation of the material after heat treatment larger technical issues

Images