Method for increasing working temp and corrosion resisting property of Nd-Fe-B by adding nona silicon nitride in crystal boundary phase

A nano-silicon nitride, working temperature technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., to achieve high working temperature and corrosion resistance, improve working temperature, and improve the effect of microstructure

Inactive Publication Date: 2006-01-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous expansion of the application range of rare earth permanent magnets, the demand for high-grade magnets such as automotive starter motors, electric vehicle drive motors, and computer HDD VCMs has also increased. High temperature resistance presents a challenge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Prepare the main phase alloy and the grain boundary phase alloy separately. The main phase alloy adopts the quick-setting sheet technology, the surface speed of the copper roller is 1.2m / s, and the composition is Nd 13.12 Fe 80.31 B 5.73 (Dy 0.32 Al 0.24 Nb 0.28 )(at%), the grain boundary phase alloy is prepared into a rapid quenching zone with a rapid quenching speed of 20m / s, and the composition is Nd 17.2 Fe 75.04 B 6.38 Dy 0.64 Ga 0.2 Cu 0.54 (at%).

[0033] 2) Powder the main phase alloy and the grain boundary phase alloy respectively. The primary crushing is carried out by a jaw crusher, the secondary crushing is carried out by a secondary crusher, and then the powder with an average particle diameter of 3 μm is made by jet milling under the protection of nitrogen.

[0034] 3) Add 10% of its weight in the grain boundary phase alloy powder, dispersed nano-silicon nitride powder (average particle diameter is 20nm), and 3% of antioxidant polyethylene o...

Embodiment 2

[0044] 1) Prepare the main phase alloy and the grain boundary phase alloy separately. The main phase alloy adopts the quick-setting sheet technology, the surface line speed of the copper roller is 2.0m / s, and the composition is Nd 14.2 Fe 78.13 B 5.81 (Tb 0.21 Al 0.24 co 1.12 Nb 0.28 )(at%), the grain boundary phase alloy is prepared into a rapid quenching zone with a rapid quenching speed of 18m / s, and the composition is Nd 16.7 Fe 76.27 B 6.31 (Dy 0.84 Ga 0.2 Cu 0.32 )(at%).

[0045] 2) Powder the main phase alloy and the grain boundary phase alloy respectively. Direct crushing by hydrogen explosion method, saturated hydrogen absorption at room temperature, and then dehydrogenation at 500 ° C for 8 hours to make hydrogen explosion powder, and then under nitrogen protection to make powder with an average particle diameter of 3.3 μm by jet milling.

[0046] 3) Adding 10% of its weight in the grain boundary phase alloy powder, dispersed nano-silicon nitride powder ...

Embodiment 3

[0056] 1) The main phase alloy is prepared by the quick-setting sheet technology, the surface line speed of the copper roll is 1.5m / s, and the composition Nd 12.59 Fe 81.32 B 5.70 Dy 0.4 (at%), using rapid quenching technology, the rapid quenching speed is 18m / s, and the grain boundary phase alloy Nd 23.74 Fe 64.78 B 6.89 (Dy 0.92 co 1.27 Cu 0.35 Nb 0.4 Al 1.66 ) (at%) made of quick quenching belt.

[0057] 2) Powder the main phase alloy and the grain boundary phase alloy respectively. Direct crushing by hydrogen explosion method, saturated hydrogen absorption at room temperature, and then dehydrogenation at 500 ° C for 7 hours to make hydrogen explosion powder, and then make powder with an average particle diameter of 4.0 μm by jet milling under nitrogen protection.

[0058] 3) Add nano-silicon nitride powder (average particle diameter is 30nm) and 1% antioxidant polyethylene oxide alkyl ether accounting for 5% of its weight through dispersion treatment in the grai...

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Abstract

This invention discloses a method for adding nm SiN in grain boundary phase to increase NdFeB working temperature and corrosion resistance including: applying casting technology for a main phase alloy to process a NdFeB ingot alloy or applying a foil rapid hardening technology to manufacture NdFeB rapid hardened foils, applying casting technology for grain boundary phase alloy to make ingot alloy or foil technology to foils or rapid extraction band by rapid extraction technology 2 powdering the two alloys, 3 adding nm SiN into the grain boundary phase alloy powder, 4, mixing them and pressing them to formation 5, sintering it in the oven to a sintered magnet.

Description

technical field [0001] The invention relates to a method for increasing the working temperature and corrosion resistance of neodymium-iron-boron by adding nano-silicon nitride to the grain boundary phase. Background technique [0002] Sintered NdFeB permanent magnet material is the most magnetic permanent magnet in the contemporary era. It has excellent characteristics such as high magnetic energy product and high cost performance. It has been used in aviation, aerospace, microwave communication technology, electronics, electroacoustics, electromechanical, computing technology, Automation technology, automobile industry, petrochemical industry, especially suitable for developing various replacement products with high performance, miniaturization and light weight. However, with the continuous expansion of the application range of rare earth permanent magnets, the demand for high-grade magnets such as automobile starter motors, electric vehicle drive motors, and computer HDD V...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08C22C38/00B22F1/00B22F3/00
Inventor 严密于濂清罗伟
Owner ZHEJIANG UNIV
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