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Low-cost N35 NdFeB magnet with high cerium content and sintering method thereof

A sintering method and NdFeB technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of high material cost, deterioration of magnetic properties, failure to reduce costs, etc., to ensure comprehensive magnetic properties. , the effect of reducing the grain size and reducing the sintering temperature

Inactive Publication Date: 2018-01-19
DONGYANG ZHONGYUAN MAGNETIC MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The N35 NdFeB magnet is currently a magnet material with a large demand in the optical disk drive, robot, and high-end audio markets. The production cost is relatively high, and the energy consumption in the production process is large.
The current conventional manufacturing methods in the industry have the following defects: (1) Adding expensive heavy rare earth elements such as gadolinium, terbium, and dysprosium, resulting in high material costs
(2) Cerium is added alone or in combination, but the amount added should not exceed 5% (wt), otherwise not only the magnetic properties will deteriorate but also the obvious effect of reducing costs will not be achieved

Method used

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  • Low-cost N35 NdFeB magnet with high cerium content and sintering method thereof
  • Low-cost N35 NdFeB magnet with high cerium content and sintering method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A low-cost N35 NdFeB magnet with high cerium content, which is prepared by sintering the following components by weight percent: praseodymium neodymium (Pr-Nd): 21.5, cerium (Ce): 11, niobium ﹙Nb﹚: 0.2, aluminum ﹙Al﹚: 0.9, copper ﹙Cu﹚: 0.15, boron ﹙B﹚: 1.0, and the rest is iron ﹙Fe﹚.

[0031] The performance of the prepared N35 NdFeB magnet is as follows when the test temperature is 20°C: remanence Br=11.9kGs, magnetic induction coercive force Hcb=11.5kOe, intrinsic coercive force Hcj=12.8kOe, maximum magnetic energy product (BH) m=33.9MGOe, squareness Hk=98.2%Hcj.

[0032] A method for sintering a low-cost N35 NdFeB magnet with high cerium content, comprising the following steps:

[0033] Step 1. Raw material weighing ratio: Weigh the following raw materials by weight percentage (wt%): praseodymium neodymium (Pr-Nd) 21.5, cerium (Ce) 11, niobium (Nb) 0.2, aluminum (Al) 0.9, copper ( Cu﹚0.15, boron﹙B﹙1.0, the rest is iron﹙Fe﹙;

[0034] Step 2. Smelting cast pieces: P...

Embodiment 2

[0051] A low-cost N35 NdFeB magnet with high cerium content, which is prepared by sintering the following components by weight percent: praseodymium neodymium (Pr-Nd): 12, cerium (Ce): 15, aluminum ﹙Al﹚: 1, boron ﹙B﹚: 1.1, cobalt (Co): 1.2, zirconium (Zr): 0.25, gadolinium (Gd): 1.5, and the rest is iron (Fe).

[0052] The performance of the prepared N35 NdFeB magnet at a test temperature of 20°C is as follows: remanence Br=12.1kGs, magnetic induction coercive force Hcb=12.2kOe, intrinsic coercive force Hcj=12.5kOe, maximum magnetic energy product (BH) m=35.4MGOe, squareness Hk=98.5%Hcj.

[0053] A method for sintering a low-cost N35 NdFeB magnet with high cerium content, comprising the following steps:

[0054] Step 1. Raw material weighing ratio: Weigh the following raw materials by weight percentage (wt%): praseodymium neodymium (Pr-Nd): 12, cerium (Ce): 15, aluminum (Al): 1, boron (B): 1.1, cobalt (Co): 1.2, zirconium (Zr): 0.25, gadolinium (Gd) 1.5, all the other are ir...

Embodiment 3

[0059] A low-cost N35 NdFeB magnet with high cerium content, which is prepared by sintering the following components by weight percent: praseodymium neodymium (Pr-Nd): 27, cerium (Ce): 7, niobium (Nb) 0.5, Copper (Cu): 1, Boron (B): 0.9, Cobalt (Co): 0.6, Zirconium (Zr): 0.5, Gadolinium (Gd): 3, and the rest is Iron (Fe).

[0060] The performance of the prepared N35 NdFeB magnet is as follows when the test temperature is 20°C: remanence Br=13.3kGs, magnetic induction coercive force Hcb=12.9kOe, intrinsic coercive force Hcj=13.3kOe, maximum magnetic energy product (BH) m=37.2MGOe, squareness Hk=98.7%Hcj.

[0061] A method for sintering a low-cost N35 NdFeB magnet with high cerium content, comprising the following steps:

[0062] Step 1. Raw material weighing ratio: Weigh the following raw materials by weight percentage (wt%): praseodymium neodymium (Pr-Nd): 27, cerium (Ce): 7, niobium (Nb) 0.5, copper (Cu): 1 , boron (B): 0.9, cobalt (Co): 0.6, zirconium (Zr): 0.5, gadolinium...

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Abstract

A low-cost N35 NdFeB magnet with high cerium content and a sintering method thereof belong to the technical field of powder metallurgy. The low-cost N35 NdFeB magnet is prepared from the following rawmaterials based on percent by weight according to a sintering process, 12-27% of praseodymium neodymium (Pr-Nd), 7-15% of cerium (Ce), 0-0.5% of niobium (Nb), 0-1% of aluminum (Al), 0-1% of copper (Cu), 0.9-1.1% of boron (B), 0-1.2% of cobalt (Co), 0-0.5% of zirconium (Zr) and 0-3% of gadolinium (Gd) with the balance being iron (Fe). In the scheme, a part of praseodymium neodymium (Pr-Nd) is substituted by cerium (Ce), the magnetic performance index reaches national standard of N35 mark sintering NdFeB, and the material cost can be reduced by 15-25 yuan during production of each kilogram of the corresponding mark magnet.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a low-cost N35 NdFeB magnet with high cerium content and a sintering method thereof. Background technique [0002] In recent years, with the rapid expansion of the application field of NdFeB magnets, the demand for raw materials has become larger and larger. However, due to the high cost of rare earth mining and the strengthening of national regulation, the cost of materials has gradually increased. increase. Rare earths such as praseodymium, neodymium, holmium, and gadolinium are added in a relatively high proportion, and the cerium content does not exceed 3 (wt%). Under the current situation of excessive price increase, the price tolerance of the downstream market is relatively limited. Some downstream enterprises have chosen to use cheaper ferrite or AlNiCo, SmCo and other materials to replace the rare earth in the raw materials of NdFeB magnets. This b...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02C22C38/12C22C38/06C22C38/16C22C38/10C22C38/14C22C33/02
Inventor 武志刚卢燎花刘云中
Owner DONGYANG ZHONGYUAN MAGNETIC MATERIAL
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