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A kind of preparation method of neodymium iron boron magnet

A neodymium iron boron and magnet technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of limited diffusion depth of grain boundary infiltration technology, inability to diffuse heavy rare earth elements, etc., to achieve satisfactory sample thickness, Satisfactory remanence and improved coercivity

Active Publication Date: 2020-08-04
宁德市星宇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for sintered NdFeB magnets, the current grain boundary infiltration technology has a limited diffusion depth, and heavy rare earth elements cannot diffuse into larger magnets. The size of the sample is strict, and generally only thin sheet magnets (within 5mm )

Method used

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  • A kind of preparation method of neodymium iron boron magnet

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preparation example Construction

[0015] The invention provides a method for preparing an NdFeB magnet, comprising the following steps:

[0016] Step 1: Process the commercial NdFeB magnet into a thickness of 8-12mm along the direction of the orientation force to obtain the basic NdFeB magnet, and then soak the basic NdFeB magnet in a hydrochloric acid solution with a volume concentration of 3-5% or a volume concentration of In 3-5% nitric acid solution for 5-20 minutes, then dry at 120-140°C for 20-120 minutes;

[0017] Step 2: Attach the diffusion alloy sheet to the upper and lower surfaces of the basic NdFeB magnet treated in step 1, then place it in the hot-press furnace, and vacuum the hot-press furnace until the vacuum degree reaches 1×10 -2 Below Pa, heat up the hot-press furnace. When the temperature reaches 700-800°C, start to apply a pressure of 20-30 MPa, and keep the pressure for 7-10 hours, then release the pressure to normal pressure, and then re-evacuate the hot-press furnace. degrees up to 1×1...

Embodiment 1

[0028] A kind of preparation method of neodymium iron boron magnet, comprises the following steps:

[0029]Step 1: Process the commercial NdFeB magnet into 5mm*10mm*8mm (8mm is the thickness) to obtain the basic NdFeB magnet (the composition of the basic NdFeB magnet is: Pr: 5.9%; Nd: 23.4%; Dy: 1%; B: 0.98%; Al: 0.1%; Cu: 0.1%; Zr: 0.1% and Fe: 68.42%;), and then soak the basic NdFeB magnet in a volume concentration of 3% In the hydrochloric acid solution, ultrasonically treat the NdFeB sheet soaked in the hydrochloric acid solution under vacuum conditions (the power of the ultrasonic treatment is 700W, and the temperature is 50°C) for 10min, and then dry at 120°C for 120min;

[0030] Step 2: Diffusion alloy sheets with a thickness of 0.1mm (prepared by a quick-setting process and composed of Pr 50 Tb 20 Cu 30 , (the numerical value represents the atomic percentage) of the diffusion alloy) is attached to the upper and lower surfaces of the basic NdFeB magnet processed in s...

Embodiment 2

[0034] Step 1: Process the commercial NdFeB magnet into 5mm*10mm*12mm (12mm is the thickness) to obtain the basic NdFeB magnet (the composition of the basic NdFeB magnet is: Pr: 5.9%; Nd: 23.4%; Dy: 1%; B: 0.98%; Al: 0.1%; Cu: 0.1%; Zr: 0.1% and Fe: 68.42%;), and then soak the basic NdFeB magnet in a volume concentration of 5% In the nitric acid solution, ultrasonically treat the NdFeB sheet soaked in the nitric acid solution under vacuum conditions (the power of the ultrasonic treatment is 800W, and the temperature is 40°C) for 5min, and then dry at 140°C for 20min;

[0035] Step 2: Diffusion alloy sheets with a thickness of 0.25 mm (prepared by a quick-setting process and composed of Pr 50 Tb 20 Cu 30 , (the numerical value represents the atomic percentage) of the diffusion alloy) is attached to the upper and lower surfaces of the basic NdFeB magnet processed in step 1, and then placed in the hot-press furnace, and the hot-press furnace is evacuated until the vacuum degree...

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Abstract

The invention provides a method for preparing a neodymium-iron-boron magnet. The upper and lower surfaces of the hot-pressing furnace are then placed in a hot-pressing furnace, and the hot-pressing furnace is evacuated. When the temperature is raised to 700-800 °C in a vacuum state, a pressure of 20-30MPa is applied, and the pressure is maintained for 7-10h, and then the pressure is released to Normal pressure, re-evacuated, continue to heat up to 850-950 ° C, and keep for 1-2 hours; the diffused samples are annealed at different temperatures in a vacuum furnace; wherein the diffusion alloy sheet is R 1 ‑R 2 ‑TM, where R 1 is Pr or Nd, R 2 is Dy or Tb, and TM is any one of Cu, Al, Zn, or Fe. The invention can produce NdFeB magnets with satisfactory magnet coercivity, remanence and sample thickness.

Description

technical field [0001] The invention relates to the technical field of magnet preparation, in particular to a preparation method of an NdFeB magnet. Background technique [0002] As an important metal functional material, sintered NdFeB magnets are widely used in many fields such as aerospace and navigation, information electronics, energy, transportation, communication, medical and health care, etc. In many fields, such as electric vehicles, hybrid vehicles and wind power generation, sintered NdFeB magnets are required to have higher coercive force to meet the use requirements at a certain temperature. [0003] Add heavy rare earth by alloying method to form high magnetocrystalline anisotropy (NdDy) 2 Fe 14 The B hard magnetic phase can significantly increase the coercive force of the magnet and reduce the attenuation of magnetic properties caused by high temperature, but at the same time, Dy atoms and Fe atoms will form antiferrocoupling, resulting in a decrease in reman...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/057H01F41/0293
Inventor 吕竹风黄家炽
Owner 宁德市星宇科技有限公司