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R-Fe-B series sintered magnet with low B content and preparation method thereof

A sintered magnet, r-fe-b technology, applied in the field of R-Fe-B sintered magnets with low B content, can solve the problems of reducing B content and hindering the increase of Hcj

Active Publication Date: 2019-12-27
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

[0005] CN105453195A describes the following content: by reducing the B content compared with common R-T-B alloys, the R-T-Ga phase is thus formed, but, according to the results of the research of the inventors, the R-T-Ga phase also has some magnetic properties. When R-T-B When there are many R-T-Ga phases in the crystal grains of the sintered magnet, it will hinder the improvement of Hcj

Method used

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  • R-Fe-B series sintered magnet with low B content and preparation method thereof
  • R-Fe-B series sintered magnet with low B content and preparation method thereof
  • R-Fe-B series sintered magnet with low B content and preparation method thereof

Examples

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Effect test

Embodiment 1

[0055] Raw material preparation process: prepare Nd and Dy with a purity of 99.5%, Fe-B for industrial use, pure Fe for industrial use, and Co, Cu, Ti, Ga, Al with a purity of 99.9%.

[0056] Melting process: Take the prepared raw materials and put them into alumina crucibles, and heat them 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.

[0057] 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, with 10 2 ℃ / sec~10 4 The quenching alloy is obtained at a cooling rate of °C / s, and the quenching alloy is subjected to heat preservation heat treatment at 600 °C for 60 minutes, and then cooled to room temperature.

[0058] Hydrogen crushing process: Vacuumize the hydrogen crushing furnace where the quenched alloy is placed at room temperature, and then p...

Embodiment 2

[0080] Raw material preparation process: prepare Nd and Dy with a purity of 99.8%, Fe-B for industrial use, pure Fe for industrial use, and Co, Cu, Ti, Ga, Zr, Si with a purity of 99.9%.

[0081] Melting process: Take the prepared raw materials and put them into a crucible made of alumina, and put them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0082] 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 at 10 2 ℃ / sec~10 4 °C / sec cooling rate to obtain quenched alloy.

[0083] Hydrogen crushing process: Vacuumize the hydrogen crushing furnace where the quenched alloy is placed at room temperature, and then pass hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. After fully absorbing hydrogen, vacuumize Wh...

Embodiment 3

[0104] Raw material preparation process: prepare Nd and Dy with a purity of 99.8%, Fe-B for industrial use, pure Fe for industrial use, Co, Cu, Ti, Ga, Ni, Nb, and Mn with a purity of 99.9%.

[0105] Melting process: Take the prepared raw materials and put them into a crucible made of alumina, and put them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out in a vacuum of Pa.

[0106] 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 at 10 2 ℃ / sec~10 4 °C / sec cooling rate to obtain quenched alloy.

[0107] Hydrogen crushing process: Vacuumize the hydrogen crushing furnace where the quenched alloy is placed at room temperature, and then pass hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure of 0.12MPa. After fully absorbing hydrogen, vacuumize While raising the temperatur...

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Abstract

The invention discloses an R-Fe-B series sintered magnet with the low B content and a preparation method thereof. The magnet comprises components of 28.5-31.5 wt% of R, 0.86-0.94 wt% of B, 0.2-1 wt% of Co, 0.2-0.45 wt% of Cu, 0.3-0.5 wt% of Ga, 0.02-0.2 wt% of Ti and 61-69.5 wt% of Fe, and the sintered magnet has an R6-T13-deltaM1+delta series phase which accounts for 75% or above of the total volume of a grain boundary. R, B, Co, Cu, Ga and Ti with the optimal range content are selected, and higher Hcj and SQ values are obtained by forming the R6-T13-deltaM1+ delta series phase with a specialcomposition and increasing the volume ratio of the R6-T13-deltaM1+delta series phase in a grain boundary phase.

Description

technical field [0001] The invention relates to the technical field of magnet manufacture, in particular to an R-Fe-B system sintered magnet with low B content. Background technique [0002] R-T-B series sintered magnets (R refers to rare earth elements, T refers to transition metal elements, and B refers to boron elements) are widely used in the fields of wind power generation, electric vehicles and inverter air conditioners due to their excellent magnetic properties, and their demand is increasing. Moreover, the requirements of various manufacturers for the performance of magnets are also gradually increasing. [0003] In order to improve Hcj, more heavy rare earth elements such as Dy and Tb with larger anisotropy field are usually added to R-T-B sintered magnets, but this method has the problem of reducing the residual magnetic flux density Br, and at the same time, due to Dy, Tb Heavy rare earth resources are limited and expensive, and there are also problems such as un...

Claims

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Application Information

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IPC IPC(8): H01F1/057
CPCH01F1/0577H01F41/0273H01F1/0576B22F3/24B22F2003/248B22F2201/20B22F2202/05B22F2301/355C22C33/02C22C38/002C22C38/005C22C38/10C22C38/14C22C38/16C22C2202/02H01F41/0266
Inventor 蓝琴周燕永田浩施尧
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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