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A Fe-based bulk permanent magnet alloy with excellent coercive force and preparation method thereof

A permanent magnet alloy, coercive force technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of low coercivity of bulk permanent magnet materials, achieve excellent coercivity, overcome the complex processing technology, The effect of expanding the field of application

Inactive Publication Date: 2011-12-21
SHANGHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

But so far, the coercivity of bulk permanent magnet materials prepared by this method is generally low, only 200~300kA / m

Method used

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  • A Fe-based bulk permanent magnet alloy with excellent coercive force and preparation method thereof
  • A Fe-based bulk permanent magnet alloy with excellent coercive force and preparation method thereof

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Embodiment 1

[0023] The composition (atomic percentage) of the hard magnetic Fe-based bulk alloy of this embodiment is: Fe 63%, Nd 7%, Nb6, B 24%. The preparation process and steps are as follows: prepare 20 grams of industrially pure metal raw materials Fe, Nd, Nb and FeB alloy according to the Fe-based bulk alloy composition of this embodiment, and then use a vacuum non-consumable electric arc furnace to melt under the protection of argon , the melting current density is 150A / cm 2 , the alloy was repeatedly smelted 4 times to obtain a master alloy; after remelting the master alloy, it was poured by a copper mold negative pressure suction casting method to obtain a bulk amorphous alloy with a size of 1mm×10mm×80mm. Put the above bulk amorphous alloy at 690°C with a vacuum of 4×10 -3 Under the condition of Pa, vacuum annealing is carried out, and the annealing time is 20 minutes, and finally the Fe-based bulk permanent magnetic alloy with excellent coercive force of the present invention ...

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Abstract

The invention relates to an Fe-based bulk permanent magnet alloy with excellent coercive force and a preparation method thereof. The composition (atomic percentage) of the Fe-based bulk permanent magnet alloy of the present invention is: Fe55-75%, Nd5-15%, Nb1-7%, B18-30%. The preparation process is as follows: (1) The industrial pure metal raw materials Fe, Nd, Nb and FeB alloy are mixed according to the above formula, and then smelted in a vacuum non-consumable electric arc furnace under the protection of argon, and the alloy is smelted repeatedly for 3~ 5 times, the master alloy was obtained; (2) after remelting the master alloy, it was poured by copper mold negative pressure suction casting method, and the Fe-based bulk amorphous alloy was obtained. (3) Vacuum annealing the above bulk amorphous alloy at 580-850°C and a vacuum degree of 3-5×10-3Pa for 10-35 minutes to obtain Fe with excellent coercive force Base bulk permanent magnet alloy. The Fe-based alloy of the present invention has soft magnetic properties in the as-cast state. After vacuum annealing, the alloy changes from soft magnetic to hard magnetic, with saturation magnetization Ms=61Am2 / kg and coercive force jHc=819kA / m.

Description

technical field [0001] The invention relates to an Fe-based bulk permanent magnet alloy with excellent coercivity and a preparation method thereof, belonging to the technical field of magnetic alloy materials and processing techniques. Background technique [0002] With the rapid development of electronics and information industries, magnetic materials play an increasingly important role in the progress of human society. Among them, the permanent magnet material is a magnetic material with a large amount of use and a wide range of uses, and the rare earth permanent magnet material is one of the permanent magnet materials with the best magnetic properties and the fastest development. At present, the main preparation method of permanent magnetic materials is to crystallize the amorphous strips, and then bond or sinter them into shape, which makes the process complicated and the cost high. With the successful preparation of bulk amorphous alloys, this provides a new idea for ...

Claims

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Application Information

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IPC IPC(8): H01F1/057C22C45/02C21D1/26C21D1/74
Inventor 谭晓华徐晖满华
Owner SHANGHAI UNIV
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