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Low-B rare earth magnet

A technology of rare earth magnets and rare earth elements, applied in the field of magnet manufacturing, can solve problems such as lack of magnet squareness, failure to improve thermal demagnetization, etc., achieve good heat resistance, improve squareness, and increase coercive force Effect

Inactive Publication Date: 2015-06-03
XIAMEN TUNGSTEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are many reports on the development of magnets with high coercivity through "low B component magnets". However, all of the above-mentioned magnets are magnets with poor squareness. Improve the problem of thermal demagnetization
[0008] In summary, there is no precedent for "low B component magnets" to actually form a product accepted by the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In the raw material preparation process: prepare Nd with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, Co with a purity of 99.9%, Cu, Al, and Si with a purity of 99.5%, and prepare them in atomic percent at%.

[0047] The contents of each element are shown in Table 1:

[0048] The ratio of each element in table 1

[0049]

[0050]

[0051] Each serial number group was prepared according to the element composition in Table 1, and 100Kg of raw materials were weighed and prepared respectively.

[0052] Melting process: Take 1 prepared raw material each time and put it into a crucible made of alumina, and heat it in a high-frequency vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0053] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 50,000 Pa, and then casting is carried out by single-roll quenching me...

Embodiment 2

[0074] In the raw material preparation process: prepare Nd with a purity of 99.9%, B with a purity of 99.9%, Fe with a purity of 99.9%, Co with a purity of 99.9%, and Cu, Al, Ga, and Si with a purity of 99.5%, and prepare them in atomic percentage at%.

[0075] The contents of each element are shown in Table 3:

[0076] The ratio of each element in table 3

[0077]

[0078] Each serial number group was prepared according to the element composition in Table 3, and 100Kg of raw materials were weighed and prepared respectively.

[0079] Melting process: Take 1 prepared raw material each time and put it into a crucible made of alumina, and heat it in a high-frequency vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0080] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 50,000 Pa, and then casting is carried out by single-roll quenching met...

Embodiment 3

[0097] In the raw material preparation process: prepare Nd with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, Co with a purity of 99.9% and Cu with a purity of 99.5%, and prepare them in atomic percent at%.

[0098] The contents of each element are shown in Table 5:

[0099] The ratio of each element in table 5

[0100]

[0101]

[0102] Each serial number group was prepared according to the element composition in Table 5, and 100Kg of raw materials were weighed and prepared respectively.

[0103] Melting process: Take 1 prepared raw material each time and put it into a crucible made of alumina, and heat it in a high-frequency vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0104] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 50,000 Pa, and then casting is carried out by single-roll quenching method, wit...

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Abstract

Disclosed is a low-B rare earth magnet. The rare earth magnet contains a main phase of R2T14B, and comprises the following raw material components: 13.5 at%-14.5 at% of R, 5.2 at%-5.8 at% of B, 0.3 at%-0.8 at% of Cu, 0.3 at%-3 at% of Co, and the balance being T and inevitable impurities, the R being at least one rare earth element comprising Nd, and the T being an element mainly comprising Fe. 0.3-0.8 at% of Cu and an appropriate amount of Co are added to the rare earth magnet by compositing, so that three Cu-rich phases are formed in the grain boundary, and the magnetic effect of the three Cu-rich phases existing in the grain boundary and the solving of the problem of insufficient B in the grain boundary can obviously improve the squareness and heat-resistance of the magnet.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a low-B rare-earth magnet. Background technique [0002] For high-performance magnets (BH)max exceeding 40MG0e used in various high-performance motors and generators, in order to obtain high-magnetization magnets, development of "low B component magnets" that reduces the amount of non-magnetic element B used becomes very necessary. [0003] At present, "low B component magnets" have been developed in various ways, however, so far, no marketable products have been developed. The biggest disadvantage of "low B component magnets" is that the squareness of the demagnetization curve (also known as Hk, or SQ) is relatively poor, and the reasons for its formation are more complicated, mainly due to R 2 Fe 17 phase appearance and B-rich phase (R 1 T 4 B 4 phase) leads to localized B deficiency at the grain boundaries. [0004] Japanese Patent Laid-Open No. 2013-70062 di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16H01F1/053B22F1/00
CPCC22C38/16H01F1/0571C22C38/007C22C38/008C22C38/04C22C38/20C22C38/30C22C38/32C22C33/0278B22F2999/00C22C2202/02H01F1/0577B22F9/04B22F2998/10C21D8/1244C21D9/0068C22C33/04C22C38/002C22C38/005C22C38/02C22C38/06C22C38/10B22F1/00B22F3/02B22F3/10B22F2202/05B22F2201/10B22F2201/20B22F2301/355B22F3/087B22F3/16
Inventor 永田浩喻荣
Owner XIAMEN TUNGSTEN CO LTD
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