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Preparation method of sintered samarium-cobalt magnet

A samarium cobalt magnet, samarium cobalt technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc. The effect of oxidizing capacity, improving storage cycle and simplifying production process

Active Publication Date: 2017-11-03
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the current patented technologies, Chinese invention patent applications CN 106222489 A and CN 105261474 A disclose the recycling method of samarium cobalt waste and leftovers, but the waste has to be re-melted, the production method is complicated, the energy consumption is large, and there is no consideration to the problem of oxygen content in the waste

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  • Preparation method of sintered samarium-cobalt magnet

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preparation example Construction

[0037] Such as figure 1 Shown, a kind of preparation method of sintered samarium cobalt magnet comprises the following steps:

[0038] (1) Preparation of alloy powder a

[0039] Prepare the samarium-cobalt alloy raw material according to the following percentage by weight: (Sm 1-x R x ): 25-27%, Fe: 6-25%, Zr: 2-3.5%, Cu: 3-8%, the balance is Co, 0≤x≤0.9.

[0040] Wherein, R is one or more of Ce, Pr, Nd, Gd, Tb, Dy, Ho and Er,

[0041] The prepared samarium-cobalt alloy raw material is melted in an intermediate frequency melting furnace, and then cast in a double-sided water-cooled copper mold to prepare alloy ingots. The melting and casting are carried out under the protection of argon, which effectively prevents the volatilization of Sm; The alloy ingot is mechanically crushed to prepare alloy particles with a size of 0.5-1 mm.

[0042] The jet milling technology is used to make the alloy particles fully mixed with the lubricant into 2.5-5μm alloy powder; during the jet...

Embodiment 1

[0062] (1) Preparation of alloy powder: Using improved jet mill powder technology, add 50ppm of oxygen in the jet mill gas path (oxygen supplement technology), and make the alloy particles fully mixed with lubricant to have an average particle size of 2.8 μm alloy powder.

[0063] The alloy powder is composed of the following components: 25.1% by weight of Sm, 20.5% by weight of Fe, 2.3% by weight of Zr, 5.9% by weight of Cu and 46.2% by weight of Co;

[0064] The preparation method of the alloy particles is as follows: configure the samarium-cobalt alloy raw material; melt the configured raw material in an intermediate frequency melting furnace, and then cast it in a double-sided water-cooled copper mold to prepare an alloy ingot with an average thickness of 30 mm; The alloy ingot is mechanically crushed to prepare alloy particles with a size of 0.5-1mm.

[0065] (2) Preparation of auxiliary material powder: using conventional jet milling technology, the auxiliary material a...

Embodiment 2

[0072] (1) Preparation of alloy powder; using improved jet mill powder technology, add 2000ppm of oxygen in the jet mill gas path (oxygen supplement technology), and make the alloy particles fully mixed with lubricant to have an average particle size of 3.5 μm alloy powder.

[0073] The alloy powder is composed of the following components: 25.6% by weight of Sm, 17% by weight of Fe, 2.9% by weight of Zr, 5.9% by weight of Cu and 48.6% by weight of Co;

[0074] The preparation method of the alloy particles is as follows: configure the samarium-cobalt alloy raw material; melt the configured raw material in an intermediate frequency melting furnace, and then cast it in a double-sided water-cooled copper mold to prepare an alloy ingot with an average thickness of 30 mm; The alloy ingot is mechanically crushed to prepare alloy particles with a size of 0.5-1mm.

[0075] (2) Preparation of auxiliary material powder: using conventional jet milling technology, the auxiliary material a...

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Abstract

The invention relates to a preparation method of a sintered samarium-cobalt magnet. The preparation method comprises the steps that alloy powder is prepared, wherein samarium-cobalt alloy raw materials are prepared, by weight, 25%-27% of (Sml-xRx), 6%-25% of Fe, 2%-3.5% of Zr, 3%-8% of Cu and the balance Co, 0<=x<=0.9, R is one or more of Ce, Pr, Nd, Gd, Tb, Dy, Ho and Er, and the samarium-cobalt alloy raw materials are subjected to smelting, casting and mechanical crushing and then subjected to an oxygen supplementary flow powder grinding technique to prepare the alloy powder; 2, leftover materials and waste materials which have the components similar to those of the alloy powder are subjected to cleaning, crushing and conventional air flow powder grinding and then fully mixed with a lubricant to prepare auxiliary material powder; 3, the materials are mixed, wherein the alloy powder and the auxiliary material powder are mixed in proportion to prepare samarium-cobalt alloy powder; 4, magnetic field molding and isostatic pressing are conducted to prepare a green body; and 5, sintering, solid solution and aging processing is conducted, and the samarium-cobalt magnet is prepared. The sintered samarium-cobalt magnet prepared through the method has the good mechanical performance and has the bending strength higher than 100 MPa.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a preparation method of a sintered samarium cobalt magnet. Background technique [0002] Due to its energy conversion function and various magnetic physical effects, permanent magnet materials are widely used in various fields such as information, communication, aerospace, transportation, etc., and become one of the important material foundations for high-tech, emerging industries and social progress. Among them, the 2:17 type samarium cobalt permanent magnet material, which is the second generation rare earth permanent magnet material, has high magnetic properties, extremely low temperature coefficient and high Curie temperature on the one hand, and good corrosion resistance and high curie temperature on the other hand. Oxidation resistance, so it plays an irreplaceable role in the field of high temperature and high stability, and is widely used in microwave tubes, gy...

Claims

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Application Information

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IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0556H01F1/0557H01F41/0266
Inventor 方以坤王帅李卫宋奎奎朱明刚俞能君陈红升
Owner CENT IRON & STEEL RES INST
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