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Permanent magnetic RE material and preparation thereof

A rare earth permanent magnet and rare earth technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of reduced intrinsic coercive force, unreasonable, large grains of magnetic materials, etc., and achieve high coercive force , low cost, low temperature coefficient effect

Active Publication Date: 2009-02-11
浙江西子富沃德电机有限公司
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  • Abstract
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Problems solved by technology

[0007] The present invention aims to solve the disadvantages in the prior art that due to the irrationality of matrix formula substitution and high-temperature sintering technology, which may easily cause the grain size of magnetic materials to become larger and the intrinsic coercive force to be reduced, a rare earth permanent magnet material is invented. Under the condition of high magnetic properties of permanent magnet materials, the rare earth permanent magnet material products with high coercive force of praseodymium and neodymium base are developed by doping (adding) nano-oxides / agents, which are evenly distributed at the NdFeB grain boundary, Inhibit the excessive growth of NdFeB grains and magnetic domain size, that is, the pinning effect (Pinning Effect), thereby effectively increasing the coercive force, increasing the operating temperature point, and reducing the temperature coefficient, thus meeting the requirements of permanent magnet motors and other To meet the needs of high-tech, provide rare earth permanent magnet materials with superior comprehensive performance

Method used

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  • Permanent magnetic RE material and preparation thereof

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preparation example Construction

[0019] The present invention also provides a method for preparing the above-mentioned rare earth permanent magnet material, which is characterized in that it comprises the following eight steps:

[0020] a) Raw material preparation (batching): batching the raw materials that have been surface cleaned according to the alloy composition;

[0021] b) Alloy smelting (homogenization treatment): put the above ingredients in an intermediate frequency vacuum induction melting furnace and melt them into ingots; then place the ingots in a vacuum furnace for homogenization treatment, and the heat treatment temperature is 800°C to 1000°C , the sintering time is 8-10 hours;

[0022] c) Milling (grinding): Grinding the homogenized ingot into 3-5um magnetic powder;

[0023] d) Magnetic field molding: put the above-mentioned magnetic powder in a magnetic field of 1.2T-2.0T for orientation, and press molding at a pressure of 10MPa-20MPa;

[0024] e) Cold isostatic pressing: The formed magnet...

Embodiment 1

[0037] Select alloy composition: Pr 5 Nd 22 Fe 64.5 Nd 0.4 Tb 5.2 Dy 0.4 co 1.22 al 0.1 Cu 0.2 B 0.98 ;

[0038] Nano oxidant doping amount: 0.1% ZrO 2 and 0.5% TiO 2 ;

[0039] Raw materials are prepared, smelted in a vacuum intermediate frequency induction furnace under the protection of high-purity argon, and alloy ingots are produced through a cooler. Crushing and fine grinding are carried out under the protection of high-purity nitrogen to obtain praseodymium-neodymium permanent magnet alloy powder with an average particle size of 4.3um. The alloy powder is mixed with a small amount of antioxidant and lubricant for 2 hours, and then pressed evenly after mixing. The pressing pressure is generally 12MPa. After pressing, the size of the permanent magnet body can be controlled to 58.20×30.3×64.3mm, and then subjected to 250MPa isostatic pressing 15 minutes of holding pressure pressing. Sintering was carried out in a sintering furnace at a temperature of 1110° C....

Embodiment 2

[0043] Select alloy composition: Pr 5 Nd 22 Fe 64.5 Nd 0.4 Tb 5.2 Dy 0.4 co 1.22 al 0.1 Cu 0.2 B 0.98

[0044] Nano oxidant doping amount: 0.2% ZrO 2 and 0.3% MgO

[0045] Raw materials are prepared, smelted in a vacuum intermediate frequency induction furnace under the protection of high-purity argon, and alloy ingots are produced through a cooler. Crushing and fine grinding are carried out under the protection of high-purity nitrogen to obtain praseodymium-neodymium permanent magnet alloy powder with an average particle size of 4.3um. The alloy powder is mixed with a small amount of antioxidant and lubricant for 2 hours, and then pressed evenly after mixing. The pressing pressure is generally 12MPa, and the size of the permanent magnet body after pressing is 58.20×30.3×64.3mm; and then isostatically pressed at 250MPa for 15 minutes pressure-holding and pressing; put into the sintering furnace at 1110°C for 2 hours for sintering, the first tempering and aging heat...

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Abstract

The invention relates to a rare earth permanent magnetic material and a preparation method thereof. The rare earth permanent magnetic material comprises a (Pr, Nd)-Fe-R-Co-Al-Cu-B-M system, and the rare earth as a main phase component has a phase volume ratio of 90%-98%; wherein R is at least two elements selected from Nb, Tb, Dy and Ho; M is at least two nanometer crystalline oxides with particle size of 10-100 nm selected from ZrO2, MgO and ZnO; and the weight of the nanometer crystalline oxides is 0.1%-3% of the total weight. The rare earth permanent magnetic material is a compound nanometer oxidizer enhanced and sintered praseodymium (Pr)-neodymium (Nd)-based permanent magnet with high coercitive force. The inventive product has magnetic features of low temperature coefficient, high coercitive force, low cost and 220 DEG C working temperature, and can overcome the shortcomings of lower coercitive force, high temperature coefficient and high cost of the prior sintered Nd-Fe-B permanent magnet and the sintered samarium-cobalt magnet in application of large motor products. The preparation method provides a powerful guarantee for realizing the positive effects.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material and a preparation method thereof, in particular to a high coercivity, low temperature coefficient, low-cost sintered praseodymium-neodymium-based permanent magnet and a preparation method thereof. Background technique [0002] Because rare earth permanent magnet materials have very high saturation magnetization, anisotropy and magnetic induction coercive force, they are widely used in various fields of industry and national defense, and become an important material basis for contemporary new technologies. With the continuous expansion of application fields and technological progress, the requirements for the magnetic properties of permanent magnet materials are increasing, especially for coercive force, working temperature stability, environmental anti-drying performance, and miniaturization. Rare earth permanent magnet materials are the core materials of permanent magnet motors, which req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08C22C38/16C22C33/04C21D6/00C21D1/18
Inventor 卢艳辉葛洪良张朋越
Owner 浙江西子富沃德电机有限公司
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