Samarium cobalt magnet and method for producing same

A manufacturing method, the technology of samarium-cobalt magnets, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems of increasing production costs, and achieve low production costs, large residual magnetism, and high coercive force Effect

Active Publication Date: 2019-05-03
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method can make the samarium-cobalt magnet have a linear remanence temperature coefficient in the range of 20-30°C to 100°C. The above-mentioned method mixes the two alloy powders, and the two alloy powders need to be prepared separately, which significantly increases the production cost.

Method used

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  • Samarium cobalt magnet and method for producing same
  • Samarium cobalt magnet and method for producing same
  • Samarium cobalt magnet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 1～2

[0072] Smelting: According to the formula in Table 1, the raw materials of samarium, gadolinium, cobalt, iron, copper and zirconium are smelted in a high-vacuum and high-frequency induction furnace. After the smelting is completed, the temperature is kept at 1460 ° C for 5 minutes, and then poured into the mold and cooled to obtain samarium. Cobalt alloy.

[0073] Pulverizing: The samarium cobalt alloy is mechanically crushed into coarse powder below 10mm (for example, 500μm) in a jaw crusher, and then subjected to high-pressure jet mill to obtain an alloy powder with an average particle size of 3.5μm.

[0074] Mixing: According to the formula in Table 1, the alloy powder was mixed with zirconium powder with an average particle size of 5 μm for 200 min to obtain a mixture.

[0075] Magnetic field forming and isostatic pressing: the mixture is oriented and formed in a magnetic field press, the magnetic field strength is 2T, the pressure is 5MPa, and the density is 4g / cm 3 's b...

Embodiment 1A～B and comparative example 1A～B

[0082] The addition amount of zirconium powder in the mixing step was changed, and the remaining conditions were the same as those in Example 1 to obtain a samarium cobalt magnet. The amount of samarium and gadolinium and the amount of zirconium powder added are shown in Table 2.

[0083] Table 2

[0084]

[0085] See Table 2 for the variation of remanence with temperature. It can be seen from the table that by controlling the amount of zirconium powder at 0.1-0.35wt%, the samarium cobalt magnet has a positive remanence temperature coefficient, and the remanence at high temperature is relatively large.

[0086] table 3

[0087]

[0088] See Table 3 for the variation of coercivity with temperature. It can be seen from the table that the samarium cobalt magnet has higher coercivity by controlling the amount of zirconium powder at 0.1-0.35wt%.

Embodiment 2A～B and comparative example 2A～B

[0090] The addition amount of zirconium powder in the mixing step was changed, and the remaining conditions were the same as those in Example 2 to obtain a samarium cobalt magnet. The amount of samarium and gadolinium and the amount of zirconium powder added are shown in Table 4.

[0091] Table 4

[0092]

[0093] See Table 4 for the variation of remanence with temperature. It can be seen from the table that by controlling the amount of zirconium powder at 0.1-0.35wt%, the samarium cobalt magnet has a positive remanence temperature coefficient, and the remanence at high temperature is relatively large.

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Abstract

The invention discloses a samarium-cobalt magnet and a manufacturing method thereof. The method comprises the following steps of: obtaining a sample; mixing the alloy powder with 0.1-0.35 wt% of zirconium powder based on the weight of the alloy powder to form a mixture, wherein the alloy powder is prepared from 10.5-13.5 wt% of samarium, 12.5-15.5 wt% of gadolinium, 50-55wt% of cobalt, 13-17wt% ofiron, 4-10wt% of copper and 2-7wt% of zirconium. By means of the method, the samarium-cobalt magnet with the positive residual magnetism temperature coefficient can be obtained in a low-cost mode.

Description

technical field [0001] The invention relates to a samarium cobalt magnet and a manufacturing method thereof, in particular to a samarium cobalt magnet with a positive remanence temperature coefficient and a manufacturing method thereof. Background technique [0002] High temperature resistant magnetic material is an important basic metal functional material. Currently, commercial samarium cobalt magnets (such as Sm 2 Co 17 Magnets) usually have a negative temperature coefficient of remanence, eg α(Br)=-0.011%; that is, the remanence decreases with increasing temperature. [0003] CN101882494A discloses a preparation method of samarium-cobalt-based sintered magnet material. In terms of mass percentage, samarium is 10-25%, cobalt is 45-55%, iron is 10-20%, copper is 3-9%, and zirconium is 3-9%. 1 to 3%, heavy rare earth elements 5 to 15%. The above method directly mixes various raw materials, and the samarium content in the embodiment is too high, resulting in a negative r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F41/02C22C19/07C22C1/04
CPCC22C19/07C22C1/0441H01F1/0557C22C2202/02B22F2998/10B22F2999/00B22F3/10B22F2201/20B22F1/09B22F3/04B22F2003/248B22F3/24B22F2301/155
Inventor 张炳军董义武志敏刁树林刘鑫苏建云范跃林袁擘袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD
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