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Melting method of sintered samarium cobalt base rare earth permanent magnet material master alloy

A rare earth permanent magnet and master alloy technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of slow cooling of alloy ingots, difficult composition control, large difference in melting point, etc., to reduce the thickness of ingots, avoid Decomposition of phases, effect of high uniformity of magnetic properties

Inactive Publication Date: 2010-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the usual water-cooled copper mold ingot casting process conditions, the alloy ingot is cooled slowly, and the structure is a multiphase mixed structure, which is not conducive to obtaining high magnetic properties.
[0005] At the same time, the melting point of the raw materials in the samarium-cobalt-based alloy is quite different, and the rare earth samarium has a low melting point and is easy to volatilize, so it is difficult to control the composition in the ordinary induction melting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Raw material of 2:17 SmCo alloy

[0018] Sm, Co, Fe, Cu, Zr

[0019] 2. Chemical composition of ingredients

[0020] Sm (wt%)

Co (wt%)

Fe(wt%)

Cu(wt%)

Zr (wt%)

25

50

16

7

2

[0021] 3. Preparation process of 2:17 type SmCo master alloy

[0022] ①Pack Fe, Co, Zr, Cu in the crucible in the vacuum quick-setting melting furnace, and Sm in the feeder in the vacuum quick-setting melting furnace;

[0023] ②Vacuumize, the vacuum degree in the furnace reaches 1.33×10 -2 Pa;

[0024] ③Pass high-purity argon gas to make the pressure in the vacuum quick-setting melting furnace 50kPa, and melt it with electricity;

[0025] ④ After all the raw materials in the crucible are melted, add metal Sm, and use electromagnetic force to automatically stir the liquid for refining. The temperature of the alloy liquid is about 1320, and keep it warm for 4 minutes;

[0026] ⑤ Cast the uniformly smelted alloy liquid onto a rotatin...

Embodiment 2

[0030] 1. Raw material of 2:17 SmCo alloy

[0031] Sm, Co, Fe, Cu, Zr

[0032] 2. Chemical composition of ingredients

[0033] Sm (wt%)

Co (wt%)

Fe(wt%)

Cu(wt%)

Zr (wt%)

25

50

16

7

2

[0034] 3. Preparation process of 2:17 type SmCo master alloy

[0035] ①Pack Fe, Co, Zr, Cu in the crucible in the vacuum quick-setting melting furnace, and Sm in the feeder in the vacuum quick-setting melting furnace;

[0036] ②Vacuumize, the vacuum degree in the furnace reaches 1.33×10 -2 Pa;

[0037] ③Pass high-purity argon gas to make the pressure in the vacuum quick-setting melting furnace 70kPa, and melt it with electricity;

[0038] ④ After all the raw materials in the crucible are melted, add metal Sm, and use electromagnetic force to automatically stir the liquid for refining. The temperature of the alloy liquid is about 1300, and it is kept for 10 minutes;

[0039] ⑤ Cast the uniformly smelted alloy liquid onto a rotating...

Embodiment 3

[0043] 1. Raw material of 2:17 SmCo alloy

[0044] Sm, Er, Co, Fe, Cu, Zr

[0045] 2. Chemical composition of ingredients

[0046] Sm (wt%)

Er (wt%)

Co (wt%)

Fe(wt%)

Cu(wt%)

Zr (wt%)

16

9

49.6

15

8

2.4

[0047] 3. Preparation process of 2:17 type SmCo master alloy

[0048] ① Install Er, Fe, Co, Zr, Cu in the crucible in the vacuum quick-setting melting furnace, and Sm in the feeder in the vacuum quick-setting melting furnace;

[0049] ②Vacuumize, and the vacuum degree in the vacuum quick-setting melting furnace reaches 1.33×10 -2 Pa;

[0050] ③Pass high-purity argon gas to make the pressure in the vacuum quick-setting melting furnace 70kPa, and melt it with electricity;

[0051] ④ After all the raw materials in the crucible are melted, metal Sm is added, and the liquid is automatically stirred by electromagnetic force for refining. The temperature of the alloy liquid is 1400°C, and it is kept for 10 minu...

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PUM

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Abstract

The invention discloses a melting method of sintered samarium cobalt base rare earth permanent magnet material master alloy, in which a vacuum induction melting technology is adopted to melt alloy ingot, and the alloy ingot is cast on a rotary water-cooled copper roll, a water-cooled molybdenum roll, a copper plate or a molybdenum plate so as to obtain high cooling speed to prepare samarium cobalt base master alloy ingot. The method comprises the steps that (1) cobalt with a high melting point and one or a plurality of the elements of iron, zirconium, copper, gadolinium, dysprosium, holmium, praseodymium and the like are put into a crucible in a vacuum quick coagulating melting furnace to be melted firstly, and then samarium is added for refining, so the volatilization of the samarium can be significantly reduced; and (2) melted alloy liquid is cooled quickly on the rotary water-cooled copper roll, the water-cooled molybdenum roll, the copper plate or the molybdenum plate, and the rotary speed on the water-cooled copper roll, the water-cooled molybdenum, the copper plate or the molybdenum plate is 1-4m / s. The invention provides a melting method which can control the melting alloy composition precisely and refines sintered samarium cobalt base rare earth permanent magnet material master alloy with columnar crystal tissues and a single phase structure.

Description

technical field [0001] The invention relates to a preparation process of a rare-earth permanent magnet master alloy, in particular to a preparation method for obtaining a sintered samarium-cobalt-based rare-earth permanent magnet master alloy with a single phase structure and a uniform columnar grain structure. Background technique [0002] Sintered samarium-cobalt rare earth permanent magnet materials have been widely used in static or dynamic magnetic circuits in the fields of microwave communication, electrical engineering, instrumentation, magnetic machinery, magnetization and magnetic therapy. At the same time, with the continuous improvement of the quality requirements of industrial equipment and military products, users of sintered Sm-Co magnets have also put forward higher and higher requirements for their magnetic properties. [0003] The Sm-Co master alloy structure has an important influence on the production of high-quality permanent magnets. The ideal master all...

Claims

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Application Information

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IPC IPC(8): C22C1/02B22D11/06H01F1/055
Inventor 李丽娅易建宏
Owner CENT SOUTH UNIV
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