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Low-cost heat-resistant sintered Ce-containing magnet containing Al magnetic hardening layer structure and preparation method

A hardened layer, low-cost technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., to improve the coercive force, broaden the scope of market application, and improve the preparation process

Active Publication Date: 2020-11-17
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical scheme of using non-magnetic Pr-Nd-Al alloys to prepare Ce-containing magnets has not been reported so far.

Method used

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  • Low-cost heat-resistant sintered Ce-containing magnet containing Al magnetic hardening layer structure and preparation method
  • Low-cost heat-resistant sintered Ce-containing magnet containing Al magnetic hardening layer structure and preparation method
  • Low-cost heat-resistant sintered Ce-containing magnet containing Al magnetic hardening layer structure and preparation method

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preparation example Construction

[0054] The preparation method of the low-cost heat-resistant sintered Ce-containing magnet containing Al magnetically hardened layer structure of the present invention comprises the following specific steps:

[0055] (1) prepare the quick-setting non-magnetic alloy sheet, the weight percent composition of the quick-setting non-magnetic alloy sheet is (Pr a Nd b ) c Al d , among them, 0≤a≤30, 70≤b≤100, 10≤d≤20, c+d=100; prepared by rapid solidification under the protection of argon, the casting temperature is 750 ° C ~ 900 ° C, the copper roller speed It is 43r / min~45r / min, and the thickness is 0.1μm~0.3μm.

[0056] (2) prepare quick-setting basic alloy sheet, the weight percentage composition of described quick-setting basic alloy sheet is: [(Pr a Nd b ) e Ce f ] g (Fe 100-k ,TM k ) h B i , where, 0≤a≤30, 70≤b≤100, 26≤f≤32, e+f=100; 29.5≤g≤30.5, 0.92≤i≤1.05, g+h+i=100; 80≤kh ≤200; TM is one or more of Cu, Al, Nb, Zr, Ag, Co elements. The basic magnet alloy sheet...

Embodiment 1、2、3

[0066] A low-cost heat-resistant sintered Ce-containing magnet with an Al magnetically hardened layer structure, its weight percent chemical general formula is:

Embodiment 3

[0067] [(Pr 0-30 Nd 70-100 ) 90 al 10 ] x {[(Pr 0-30 Nd 70-100 ) 75 Ce 25 ] 29.5 (Fe 98.8 ,TM 1.2 ) 69.58 B 0.92} y , wherein, 0.5≤x≤3, x+y=100; TM is one or more of Cu, Al, Nb, Zr, Ag, Co elements, wherein, the magnet of embodiment 1 (x=0.5, y= 99.5); Embodiment 2 magnet (x=2, y=98); Embodiment 3 magnet (x=3, y=97)

[0068] The preparation method of the above-mentioned low-cost heat-resistant sintered Ce-containing magnet containing Al magnetically hardened layer structure is carried out as follows:

[0069] (1) prepare quick-setting non-magnetic alloy sheet, the weight percent composition of alloy sheet is:

[0070] (Pr 0-30 Nd 70-100 ) 90 al 10 . It is prepared by rapid solidification under the protection of argon, the casting temperature is 750 ℃ ​​~ 800 ℃, the copper roller speed is 43r / min ~ 45r / min, and the thickness is 0.1μm ~ 0.3μm.

[0071] (2) prepare quick-setting basic alloy sheet, the weight percent composition of alloy sheet is:

[0072] [(...

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Abstract

The invention relates to a low-cost heat-resistant sintered Ce-containing magnet containing an Al magnetic hardening layer structure and a preparation method thereof. The permanent magnet comprises the following chemical components by weight percentage of [(PraNdb) cAld]x{[(PraNdb) eCef]g(Fe100-k, TMk)hBi}y, wherein 0 <= a <= 30, 70 <= b <= 100, 10 <= d <= 20, c+d=100; 26 <= f <= 32, and e+f =100;g is greater than or equal to 29.5 and less than or equal to 30.5, i is greater than or equal to 0.92 and less than or equal to 1.05, and the sum of g, h and i is equal to 100; 80 <= kh <= 200; x ismore than or equal to 0.5 and less than or equal to 3, and the sum of x and y is equal to 100; TM is one or more of Cu, Al, Nb, Zr, Ag and Co, and does not contain any heavy rare earth element or gallium element. The microstructure of the permanent magnet comprises a permanent magnet main phase, an Al-containing main phase epitaxial magnetic hardening thin layer and a white rare-earth-rich phase with the Fe weight percentage smaller than 40%. The Al-containing main phase epitaxial magnetic hardening thin layer and the permanent magnet main phase form a double-main-phase structure, so that a large amount of Al is prevented from entering the permanent magnet main phase. According to the method, the coercive force can be obviously improved, the thermal stability is obviously improved, the Curie temperature is hardly reduced, and the residual magnetism is not obviously reduced.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a low-cost heat-resistant sintered Ce-containing magnet with an Al-containing magnetically hardened layer structure and a preparation method thereof. Background technique [0002] In order to balance the comprehensive utilization of rare earth resources and reduce environmental pollution, the development of resource-saving sintered cerium-Nd-Fe-B permanent magnets with high coercivity has become a current hot topic. However, with the development of high-tech, precision and cutting-edge industries, higher requirements are placed on the thermal stability of magnets. Therefore, it is of great significance to simultaneously develop low-cost, high coercive force and high thermal stability sintered Ce-Nd permanent magnets. [0003] The development of sintered cerium neodymium permanent magnets without any heavy rare earth and noble metal gallium (the price of galli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 夏峰朱明刚刘吉祥王瑜李卫
Owner CENT IRON & STEEL RES INST
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