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Ho and W containing rare earth magnet

A rare earth magnet and rare earth element technology, applied in the field of magnet manufacturing, can solve problems such as abnormal growth of crystal grains, and achieve the effects of high industrial value, AGG reduction and high economic effect.

Active Publication Date: 2016-11-23
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, for rare-earth magnets whose sintering performance has been greatly improved, abnormal grain growth (AGG) is extremely prone to occur if only a small amount of impurities in the crystal grain boundaries are used to suppress abnormal grain growth.

Method used

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  • Ho and W containing rare earth magnet
  • Ho and W containing rare earth magnet
  • Ho and W containing rare earth magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In the raw material preparation process: prepare Nd with a purity of 99.5%, Ho with a purity of 99.9%, Fe-B for industrial use, pure Fe for industrial use, Cu and Al with a purity of 99.5% and W with a purity of 99.99%, and prepare them in wt%.

[0048] The contents of each element are shown in Table 2:

[0049] Table 2 The ratio of each element

[0050]

[0051] Each serial number group was prepared according to the element composition in Table 2, and 10Kg of raw materials were weighed and prepared respectively.

[0052] Melting process: Take 1 part of the prepared raw material each time and put it into a crucible made of alumina, and put it in a 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 air pressure reach 55,000 Pa, and then casting is carried out by single-roll quenching method, ...

Embodiment 2

[0072] In the raw material preparation process: prepare Nd with a purity of 99.5%, Ho with a purity of 99.9%, Fe-B for industrial use, pure Fe for industrial use, and W with a purity of 99.99%, and prepare them by weight percentage.

[0073] The contents of each element are shown in Table 4:

[0074] Table 4 The ratio of each element

[0075]

[0076] Each serial number group was prepared according to the element composition in Table 4, and 10Kg of raw materials were weighed and prepared respectively.

[0077] Melting process: Take 1 part of the prepared raw material each time and put it into a crucible made of alumina, and put it in a vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0078] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 48,000 Pa, and then casting is carried out by single-roll quenching method, with 10 2 ℃ / sec~10...

Embodiment 3

[0096] In the raw material preparation process: prepare Nd with a purity of 99.5%, Ho with a purity of 99.9%, Fe-B for industrial use, pure Fe for industrial use, W with a purity of 99.99%, and Zr, Ga, Nb, Mn, Si, Cr, Cu, Mo are formulated in weight percent.

[0097] The contents of each element are shown in Table 6:

[0098] Table 6 The ratio of each element

[0099]

[0100] Each serial number group was prepared according to the element composition in Table 6, and 10Kg of raw materials were weighed and prepared respectively.

[0101] Melting process: Take 1 part of the prepared raw material each time and put it into a crucible made of alumina, and put it in a vacuum induction melting furnace at 10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0102] Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 45,000 Pa, and then casting is carried out by single-roll quenching ...

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Abstract

The invention discloses a Ho and W containing rare earth magnet which contains an R2Fe14B type main phase and is prepared from the following raw material components: 28 to 33 weight percent of R which comprises rare earth elements such as Nd and 0.3 to 5 weight percent of Ho, 0.8 to 1.3 weight percent of B, 0.0005 to 0.03 weight percent of W and the balance of T and unavoidable impurities, wherein T is an element mainly comprising Fe and / or Co. According to the rare earth magnet, trace W is used for inhibiting the growth of crystalline grains in the sintering process of a Ho containing magnet, so that generation of AGG of the Ho containing magnet is prevented, and the magnet with high coercive force and high heat resistance is obtained.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to a rare earth magnet containing Ho and W. Background technique [0002] Sintered Nd-Fe-B magnets have superior magnetic properties and are widely used in wind power generation, nuclear magnetic resonance, automobile industry, computers, aerospace, household appliances, etc. Nd is consumed too much. However, Ho exists in a large amount and is a low-cost material that can be obtained in industrial production. Selecting Ho to partially replace metal Nd in the magnet is of great significance for reducing the actual production cost of rare earth magnets and realizing the comprehensive utilization of rare earth resources. [0003] Li Feng et al. described in "The Effect of Adding Gd or Ho on the Structure and Properties of Sintered Nd-Fe-B Magnets" (Powder Metallurgy Industry, Volume 21, Issue 5, October 2011), adding Ho can significantly improve the The temperature stabili...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08B22F3/10
CPCC22C38/005C22C38/06C22C38/12C22C38/16H01F1/0577B22F3/16B22F9/04B22F2009/044B22F2201/013B22F2201/10B22F2201/20B22F2202/05B22F2301/355C22C2202/02
Inventor 永田浩张建洪
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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