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High-remanence low-coercivity samarium cobalt permanent magnetic material and preparation method

A permanent magnet material, low coercivity technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problem of difficult magnetization to saturation, restrict the application field of samarium cobalt magnets, etc., achieve easier saturation magnetization, overcome the The effect of magnetization unsaturated, high surface magnetic field

Active Publication Date: 2012-10-31
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the limitations of the current magnetizing equipment and the size of the magnetizing field, once these magnets are made into special shapes, such as large blocks or permanent magnet rings, it is difficult to magnetize to saturation, which restricts the application field of samarium cobalt magnets

Method used

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  • High-remanence low-coercivity samarium cobalt permanent magnetic material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The following steps are used to prepare the samarium cobalt permanent magnet material containing the composition of 1# in Table 1.

[0040] 1) Prepare alloy castings with the composition of 1# shown in Table 1 (without considering burning loss), in which, the chemical composition of Alloy A is: Sm~25%, Co~49.2%, Fe~18% , Cu~5%, Zr~2.8%; the chemical composition of B alloy is: Sm~10%, Pr~5%, Ce~20%, Co~47%, Fe~8%, Cu~10% . Smelt the prepared two raw materials separately to make alloy cast or quick-setting flakes. The average thickness of the quick-setting flakes ranges from 0.15-0.5mm;

[0041] 2) The alloy casting sheet or quick-setting thin sheet in 1) is mechanically crushed into particles with a size of 0.5-1.0 mm;

[0042] 3) Use the ball milling method to crush the A alloy particles in 2) into a powder of about 3 microns; use a high-energy ball mill to further grind the powder of the B component to 100 nanometers; mix A and B powders, of which A powder is 95%, B ...

Embodiment 2

[0048] The following steps are used to prepare the samarium cobalt permanent magnet material containing the composition of 2# in Table 1.

[0049] 1) Prepare alloy castings with the composition of 2# shown in Table 1 (without considering burning loss), in which, the chemical composition of Alloy A is: Sm~25%, Co~49.2%, Fe~20% , Cu~3%, Zr~2.8%; the chemical composition of B alloy is: Sm~10%, Pr~5%, Ce~20%, Co~47%, Fe~8%, Cu~10% .

[0050] 2) The alloy casting sheet or quick-setting thin sheet in 1) is mechanically crushed into particles with a size of 0.5-1.0 mm;

[0051] 3) Under protective gas, mix the particles in 2) with the anti-oxidation lubricant at a ratio of 3ml / kg, and use dry method (jet milling) to crush it into a powder of about 2 microns; wherein, the anti-oxidation lubricant Alcohol and gasoline account for 96%, and base synthetic oil accounts for 4%; the base synthetic oil is polya-olefin, and the viscosity index is greater than 90; the alcohol is ethanol.

...

Embodiment 3

[0058] The following steps are used to prepare the samarium cobalt permanent magnet material containing the composition of 3# in Table 1.

[0059] 1) Prepare alloy castings with the composition of 3# (without considering burning loss) shown in Table 1, wherein the chemical composition of Alloy A is: Sm~24.5%, Co~49.5%, Fe~18% by mass percentage , Cu~5%, Zr~3%; the chemical composition of B alloy is: Sm~10%, Pr~5%, Ce~20%, Co~47%, Fe~8%, Cu~10% by mass percentage .

[0060] 2) The alloy casting sheet or quick-setting thin sheet in 1) is mechanically crushed into particles with a size of 0.5-1.0 mm;

[0061] 3) Under protective gas, mix the particles in 2) with the anti-oxidation lubricant at a ratio of 7ml / kg, and use dry method (jet milling) to crush it into a powder of about 1.5 microns; wherein, the anti-oxidation lubricant Alcohol and gasoline account for 85%, and base synthetic oil accounts for 15%; the base synthetic oil is ester oil with a viscosity index greater than ...

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Abstract

The invention belongs to the field of rare earth permanent magnetic material manufacturing, and relates to a high-remanence low-coercivity samarium cobalt permanent magnetic material and a preparation method. The chemical components of the permanent magnetic material by mass percent are shown as follows: 23-26.5% of [Sm1-x-y(Prx, Cey)], 17-20% of Fe, 3-6% of Cu, 1-3% of Zr, and the balance of Co, wherein x is not less than 0 and not more than 0.1, and y is not less than 0 and not more than 0.1. In the preparation method, a double main phase alloying method and a rapid hardening technology are used, a rapid hardening belt with two components is needed only, and a high-remanence low-coercivity magnet can be prepared; an anti-oxidation lubricant is added in a jet milling process so as to prevent agglomeration and oxidation of magnetic powder, and the oxygen content of the magnet is less than 1500ppm. By addition of Ce and Pr, the thermal treatment temperature of the samarium cobalt permanent magnetic material is reduced. The magnet performance is shown as follows: Br=11.0-11.5kGs, Hcj=10-20kOe, and (BH)max=28-33MGOe.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a samarium-cobalt permanent magnet material with high remanence and low coercive force temperature coefficient and a preparation method thereof. Background technique [0002] In many high-tech fields, permanent magnet materials are very important functional devices and play an irreplaceable role. Compared with other types of permanent magnet materials such as NdFeB, AlNiCo, etc., the 2:17 type SmCo permanent magnet material, which is the second generation rare earth permanent magnet material, has high temperature stability, strong corrosion resistance and high Excellent comprehensive performance such as energy supply is widely used in automobile, transportation, computer technology, radar, satellite communication and aerospace technology. Samarium-cobalt permanent magnet materials contain a large amount of rare earth element samarium (Sm) and important strategic eleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147B22F3/16
Inventor 朱明刚李卫方以坤孙威汪旭超
Owner CENT IRON & STEEL RES INST
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