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Sintered Nd-Fe-B open type sintering feed box and use method thereof

A sintered material box, NdFeB technology, applied in inductor/transformer/magnet manufacturing, electrical components, circuits, etc., can solve the problems of heavy workload, inability to take into account cooling speed and tightness at the same time, low work efficiency, etc., to achieve the effect Good, improve ventilation, and reduce energy consumption

Active Publication Date: 2016-09-14
CHINALCO JINYUAN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, sintered NdFeB has extremely high requirements for anti-oxidation. NdFeB has a certain density after powder pressing and magnetic field forming, but its density only reaches 50-60%, which is actually in the form of a porous material. Therefore, it is easy to absorb gas, and it needs to be strictly protected during the whole process. Therefore, graphite boxes with good sealing performance are often selected in production, which leads to the contradiction that the cooling speed and sealing performance cannot be taken into account at the same time. For this reason, the manufacturer is sintering After the densification is completed, the product is taken out of the sintering furnace, and then placed in an open material box for aging treatment. This method is effective, but it has the disadvantages of heavy workload and low work efficiency.

Method used

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  • Sintered Nd-Fe-B open type sintering feed box and use method thereof
  • Sintered Nd-Fe-B open type sintering feed box and use method thereof
  • Sintered Nd-Fe-B open type sintering feed box and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for using a sintered NdFeB open-type sintered material box is realized by the following steps:

[0029] Step 1: Boxing, the sintered NdFeB blank (nominal composition (PrNd) 30.8 al 0.8 Cu 0.15 Nb 0.3 B 1.0 Fe 余 ) into the above-mentioned magazine;

[0030] Step 2: Seal, use tin foil to cover the opening of the material box, and tighten the sealing edge 2 to form a complete seal as a whole;

[0031] Step 3: Opening treatment, transfer the sealed material box to a vacuum sintering furnace and heat it under vacuum. When the temperature in the vacuum sintering furnace reaches 200°C, the tin foil is melted, so that the material box is really opened, and there is a through hole on the material box 4 communicate with the outside.

[0032] Step 4: Sintering and aging. The product is sintered and aged in a vacuum sintering furnace. After the heat preservation is completed, it is filled with nitrogen or inert gas and directly quenched.

Embodiment 2

[0039] A method for using a sintered NdFeB open-type sintered material box is realized by the following steps:

[0040] Step 1: Boxing, the sintered NdFeB blank (nominal composition (PrNd) 30.8 al 0.8 Cu 0.15 Nb 0.3 B 1.0 Fe 余 ) into the above-mentioned magazine;

[0041] Step 2: Seal, use tin foil to cover the opening of the material box, and tighten the sealing edge 2 to form a complete seal as a whole;

[0042] Step 3: Opening treatment, transfer the sealed material box to the vacuum sintering furnace, and heat it under vacuum. When the temperature in the vacuum sintering furnace reaches 320°C, the tin foil will be melted, so that the material box is really opened, and there is a through hole on the material box 4 communicate with the outside.

[0043] Step 4: Sintering and aging. The product is sintered and aged in a vacuum sintering furnace. After the heat preservation is completed, it is filled with nitrogen or inert gas and directly quenched.

[0044] As compari...

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Abstract

The invention discloses a sintered Nd-Fe-B open type sintering feed box and a use method thereof. The feed box comprises a box body, a sealing folded edge, supporting folded edges and through holes. The box body is used for containing a container of sintering blanks, and an opening is formed in the upper portion of the box body. The sealing folded edge is fixed outside the box body. The supporting folded edges are arranged at the bottom and the opening and used for providing supporting force when feed boxes are laminated. The through holes are formed in the upper portion of the sealing folded edge and formed in the front portion, the rear portion, the left portion and the right portion of the box body and are used for ventilation in the cooling process, so that cooling capacity is improved. The use method of the feed box comprises the steps of 1, boxing, 2, sealing, and 3, sintering. According to the sintered Nd-Fe-B open type sintering feed box and the use method thereof, due to the good ventilation effect of the box body, discharge treatment is not needed, the work efficiency is improved, and labor intensity is lowered. In addition, the feed box is provided with the supporting folded edges, so that it is avoided that when multiple box bodies are laminated, overall inclination is caused by insufficient supporting faces, and consequently normal use is influenced.

Description

technical field [0001] The invention relates to the field of sintering of NdFeB production, more specifically, it relates to an open-type sintering material box for sintering NdFeB. Background technique [0002] As we all know, the sintering cooling rate has an important impact on the magnetic properties of sintered NdFeB. As a material box for containing rough products, its ventilation and thermal conductivity play a decisive role in the cooling rate of the product. At the same time, sintered NdFeB has extremely high requirements for anti-oxidation. NdFeB has a certain density after powder pressing and magnetic field forming, but its density only reaches 50-60%, which is actually in the form of a porous material. Therefore, it is easy to absorb gas, and it needs to be strictly protected during the whole process. Therefore, graphite boxes with good sealing performance are often selected in production, which leads to the contradiction that the cooling speed and sealing perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10H01F41/00
CPCB22F3/003B22F3/10H01F41/00
Inventor 黄伟超甘家毅龙植枝陈谦陈东雯
Owner CHINALCO JINYUAN RARE EARTH
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