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Technological method for producing high-performance neodymium iron boron bonding magnetic powder

A process method, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of performance degradation, excessive grain size, low initial magnetic performance, etc., to achieve performance improvement, grain distribution uniform effect

Active Publication Date: 2013-03-27
BAOTOU KERUI MICRO MAGNET NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 4. Under-quenched magnetic powder, the grain size is too large, and the initial magnetic properties are relatively low
If the conventional crystallization temperature is used, the grain size will continue to grow, and the distribution will be worse, and the performance will be further reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Ingredients according to the design weight percentage, 99.9% pure rare earth neodymium metal, 26.4% by weight; boron iron (B content 20.4%), 4.8% by weight; use 99.5% pure niobium metal, 0.15% by weight; 99.9 % purity metal cobalt, 2.0% by weight; the balance is electrical pure iron, with a total of 104 kg of ingredients. According to the process of the invention, two batches are put into an intermediate frequency vacuum induction furnace for melting, and cast into alloy ingots. The alloy ingot is put into a 100 kg vacuum induction melting and quenching furnace to make about 95 kg of alloy sheet. Break the alloy flakes. Then use a magnetic separator to classify and select, where the Q value is fixed as: 55 for the weak magnetic field area, 220 for the medium magnetic field area, and 780 for the strong magnetic field area; 29 kg of over-quenched magnetic powder, 18.8 kg of under-quenched magnetic powder, and 46 kg of reasonable quenched magnetic powder are selected. kg...

Embodiment 2

[0051] According to the design weight percentage ingredients, 99.9% pure rare earth neodymium metal, 26.7% by weight; boron iron (B content 20.4%), 4.8% by weight; 99.5% pure niobium metal, 0.15% by weight; 99.9% The purity metal cobalt is 2.0% by weight; the balance is electrical pure iron, with a total batching of 106 kg. According to the process of the present invention, it is put into an intermediate frequency vacuum induction furnace for melting in two batches, and cast into alloy ingots. The alloy ingot is put into a 100 kg vacuum induction melting quick quenching furnace to make about 96 kg of alloy sheet. Break the alloy flakes. Then use a magnetic separator to classify and select, where the Q value is fixed as: 65 for the weak magnetic field area, 210 for the medium magnetic field area, and 880 for the strong magnetic field area; 32.4 kg of over-quenched magnetic powder, 12.6 kg of under-quenched magnetic powder, and 49.3 kg of reasonable quenched magnetic powder were...

Embodiment 3

[0053] Ingredients according to the design weight percentage, 99.9% pure rare earth neodymium metal, 27.1% by weight; boron iron (B content 20.4%), 4.8% by weight; 99.5% pure niobium metal, 2.05% by weight; the balance is electrician Pure iron, with a total of 108 kg of ingredients, is put into an intermediate frequency vacuum induction furnace for melting in two batches, and cast into alloy ingots. The alloy ingot is put into a 100 kg vacuum induction melting and quenching furnace to make about 98 kg of alloy sheet. Break the alloy flakes. Then use a magnetic separator to classify and select, and the Q value is fixed as: weak magnetic field area 98, medium magnetic field area 210, and strong magnetic field area 980; from which, 52.4 kg of over-quenched magnetic powder, 12.6 kg of under-quenched magnetic powder, and 31.3 kg of reasonable quenched magnetic powder were selected. , The slag is about 1.2 kg. According to the process described in this process, the three kinds of ...

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Abstract

The invention relates to a technological method for producing high-performance neodymium iron boron bonding magnetic powder. The technological method is characterized by comprising the steps of: classifying rapid-quenched neodymium iron boron magnetic powder into three types, namely over-quenched magnetic powder, under-quenched magnetic powder and reasonable-quenching-rate magnetic powder, in terms of the distinctions of crystal microstructures and the average size of inner crystals of the magnetic powder; separating the magnetic power according to the classification standard; and carrying out thermal treatment on the tree types of separated magnetic powder with different quenching rates under different temperature and time conditions for crystallization thermal treatment so as to obtain the magnetic powder with the optimal magnetic performance. The technological method has the advantages that a magnetic-separation grading method with accuracy in calculation is used to classify the magnetic powder with different quenching rates, then, the thermal treatment manners with different temperature and time conditions for crystallization thermal treatment are adopted to make crystal gains uniform in distribution so as to obtain the optimal grain size, thus, the optimal magnetic performance can be obtained, and the high-performance bonding magnetic powder can be produced. The technological method can be used for improving the performances of like magnetic powder by more than 15-20%.

Description

Technical field: [0001] The invention relates to a process method for producing high-performance NdFeB bonded magnetic powder, which belongs to the technical fields of metallurgy and electronic industry. technical background: [0002] NdFeB rare earth magnetic materials can be basically divided into two types according to the production process. One is sintered NdFeB, and the other is bonded NdFeB. The basic raw material for bonding NdFeB magnets is called NdFeB quenching magnetic powder. The large-scale production and application of quenched magnetic powder began in the late 1980s. The basic raw materials of NdFeB quenching magnetic powder are rare earth Nd metal, boron and metallic iron. Its production process is very complicated, which can be basically summarized as: alloy smelting, alloy quenching, magnetic powder crushing, magnetic powder crystallization, magnetic powder mixing and packaging. [0003] Since the production process of NdFeB quenched magnetic powder in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00H01F1/057H01F1/08
Inventor 蔺继荣刘官员
Owner BAOTOU KERUI MICRO MAGNET NEW MATERIALS CO LTD
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