Preparation method of small complex magnetic shielding parts

Abstract

The invention discloses a preparation method of small complex magnetic shielding parts, belonging to the technical field of injection molding. The preparation method comprises the steps of: mixing high-purity pure iron powder or Fe-Ni permalloy powder with a binder and granulating to obtain uniform feed; adopting a powder injection molding process to obtain formed blanks, degreasing by matching with a two step approach, introducing hydrogen for sintering, relieving the residual stress of the sintered sample by heat treatment with introduced hydrogen, thereby realizing the one-time forming of the magnetic shielding parts with complex structure. The preparation method of the small complex magnetic shielding parts is simple, convenient to operate, can realize the one-time forming of the magnetic shielding parts with complex structure by use of the injection molding process, and breaks through the limitation of the traditional processing technology on the design of appearances and structures of the magnetic shielding parts. The content of impurities in the pure iron or permalloy can be effectively reduced and the magnetic property of the pure iron or permalloy can be improved by controlling the content of the impurities in the pure iron or permalloy and matching with degreasing by using the two step approach and sintering with introduced hydrogen. The preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing small and complex magnetic shielding parts, and belongs to the technical field of metal injection molding preparation. Background technique [0002] With the rapid development of the modern electronics industry, electronic components are developing in the direction of miniaturization and complexity, and higher and higher requirements are placed on the shape and size of magnetic shielding parts, and their sizes are getting smaller and smaller (as small as several mm), with increasingly complex shapes and structures (such as figure 1 The magnetic shielding components shown include complex structures such as convex hulls and air holes). The application range of magnetic shielding parts prepared by traditional machining methods is greatly limited, mainly in the following areas: [0003] (1) Some magnetic shielding materials such as pure iron and permalloy have low hardness, and are easy to stick to the knif...

AI Technical Summary

Problems solved by technology

[0003] (1) Some magnetic shielding materials such as pure iron and permalloy have low hardness, and are easy to stick to the knife during machining, making machining difficult;

[0004] (2) The raw materials of magnetic shielding parts prepared by traditional machining are wasteful, the manufacturing cost is high, and the production cycle is long, resulting in low production efficiency;

However, due to the addition of a large amount of binder in the MIM method, it is easy to increase the carbon and oxygen content during the degreasing process.

Decrease the performance of MIM soft magnetic alloy

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