CN-115831517-B - Magnetic material assembly and preparation method thereof

CN115831517BCN 115831517 BCN115831517 BCN 115831517BCN-115831517-B

Abstract

The invention discloses a magnetic material component, which comprises a neodymium-iron-boron permanent magnet and a samarium-cobalt permanent magnet which are combined into a whole through an adhesive, wherein the number of the samarium-cobalt permanent magnets is at least one, the neodymium-iron-boron permanent magnet is a far heat source end, and the samarium-cobalt permanent magnet is a near heat source end. The invention combines the samarium-cobalt permanent magnet with high temperature resistance and the neodymium-iron-boron permanent magnet with high magnetic performance into a whole by using the adhesive, so that the magnet for high-performance neodymium-iron-boron and the samarium-cobalt permanent magnet with high temperature resistance develop a combined magnet with excellent comprehensive magnetic performance under the condition of magnetostatic interaction, and can still simultaneously meet the requirements of high performance and high use temperature under the condition of not adding heavy rare earth elements.

Inventors

CHEN XI
WANG CHAO
CHEN ZHONGHE
GUO FEI
YANG KUNTANG

Assignees

扬州华翀电力电子科技有限公司

Dates

Publication Date: 20260512
Application Date: 20221010

Claims (2)

1. The magnetic material component is characterized by comprising a neodymium-iron-boron permanent magnet and a samarium-cobalt permanent magnet which are combined into a whole through an adhesive, wherein the number of the samarium-cobalt permanent magnets is at least one, the neodymium-iron-boron permanent magnet is a far heat source end, and the samarium-cobalt permanent magnet is a near heat source end, and the preparation method comprises the following steps: S1, preparing at least one of rare earth metal praseodymium and lanthanum and at least one of metal elements zirconium and yttrium into powder with the granularity of 5 mu m by utilizing a ball milling or air flow milling process; S2, taking cerium oxide with a fluorite structure as a substrate, respectively adding at least one of 10wt.% of rare earth element praseodymium and lanthanum powder, and at least one of 10wt.% of metal element zirconium and yttrium powder, uniformly mixing, sintering at a temperature of 1000-1500 ℃, preparing an oxide ceramic material, and preparing the oxide ceramic material into powder with a particle size of 3-30 mu m by utilizing a ball milling or air milling process; S3, uniformly mixing the oxide ceramic material powder and polyoxyethylene-8-octyl phenyl ether according to the mass ratio of 1:0.05-0.2 to prepare an adhesive for later use; S4, cutting the samarium-cobalt permanent magnet into a proper size along the direction of an easy magnetization axis, uniformly coating an adhesive on the bonding surface of the neodymium-iron-boron permanent magnet and the samarium-cobalt permanent magnet, covering the neodymium-iron-boron permanent magnet on the surface of the samarium-cobalt permanent magnet, bonding the samarium-cobalt permanent magnet and the neodymium-iron-boron permanent magnet together by using the adhesive to form an assembly, and compacting; S5, performing heat treatment on the obtained assembly under the condition of the curing temperature of the adhesive, so that the neodymium-iron-boron permanent magnet and the samarium-cobalt permanent magnet are tightly attached together to form a whole; s6, carrying out surface anti-corrosion treatment on the obtained assembly; and S7, magnetizing the obtained assembly to a magnetization saturation state under the condition of a pulse magnetic field to obtain a final product.
2. A magnetic material assembly according to claim 1, wherein the neodymium-iron-boron permanent magnet consists of grains with a grain size of 200nm to 10 μm.

Description

Magnetic material assembly and preparation method thereof Technical Field The invention relates to a magnetic material component and a preparation method thereof, and belongs to the field of magnetic material components and preparation methods. Background Rare earth permanent magnet materials are widely applied to consumer electronics, household appliances, intelligent manufacturing and aerospace. The neodymium-iron-boron permanent magnet material has the strongest magnetic performance, the largest application amount and the yield of the neodymium-iron-boron permanent magnet material is more than 94% of the yield of the whole rare earth permanent magnet material. Along with continuous optimization of the preparation process and the magnet components, the maximum magnetic energy product of the neodymium-iron-boron magnet is close to a theoretical value, and in order to obtain a high magnetic energy product, the content of rare earth neodymium elements is slightly higher than the positive percentage of the material, and heavy rare earth elements such as dysprosium or terbium cannot be added, which generally results in lower coercive force of the high-performance neodymium-iron-boron magnet, further results in lower use temperature, and greatly limits the application scene of the high-performance neodymium-iron-boron magnet. In order to obtain high coercive force and use temperature, heavy rare earth elements such as dysprosium or terbium are usually added, but at the same time, the magnetic performance of the magnet is greatly reduced, and the cost of raw materials is increased. The sintered samarium cobalt permanent magnet material is a rare earth permanent magnet material with highest Curie temperature, and the sintered neodymium iron boron magnet with relatively high residual magnetism and magnetic energy product of the sintered samarium cobalt magnet is low, but is beneficial to the sintered samarium cobalt magnet to have very high Curie temperature and ultrahigh coercivity, the use temperature of part of products can reach 500-550 ℃, the use temperature is far higher than that of the high-performance neodymium iron boron magnet, and the cost of raw materials is far lower than that of the sintered neodymium iron boron magnet with heavy rare earth elements dysprosium and terbium under the condition of the same use temperature. Meanwhile, in the use process of the motor, eddy current loss is also an important factor to be avoided to the greatest extent in the development and design of the magnet. However, low-cost permanent magnet materials which can meet the ultra-high use temperature and high performance and low eddy current loss are not yet developed, and related technologies still need to be further developed. Disclosure of Invention In order to solve the defects of the prior art, the invention provides a magnetic material component and a preparation method thereof, which overcome the defects that a large amount of heavy rare earth is required to be added in the neodymium-iron-boron material in the prior art to improve the coercive force and the thermal stability of a neodymium-iron-boron magnet, but the cost is high, and simultaneously solve the situation that the requirements of a high-performance motor cannot be met due to relatively low magnetic performance of the samarium-cobalt magnet. The technical scheme adopted by the invention is as follows: a magnetic material assembly comprises neodymium-iron-boron permanent magnets and samarium-cobalt permanent magnets which are combined into a whole through an adhesive, wherein the number of the samarium-cobalt permanent magnets is at least one, the neodymium-iron-boron permanent magnets are far heat source ends, and the samarium-cobalt permanent magnets are near heat source ends. As one preferable aspect of the present invention, the neodymium-iron-boron permanent magnet is composed of grains having a grain size of 200nm to 10 μm. As a preferable mode of the invention, the adhesive is prepared from a heat insulation material and polyoxyethylene-8-octyl phenyl ether according to a mass ratio of 1:0.05-0.2. In one preferred aspect of the present invention, the heat insulating material is prepared by adding at least one of praseodymium and lanthanum in powder form and at least one of zirconium and yttrium in powder form to a base of cerium oxide having a fluorite structure, sintering the mixture, and pulverizing the sintered mixture. The preparation method based on the magnetic material component comprises the following steps: S1, preparing at least one of rare earth metal praseodymium and lanthanum and at least one of metal elements zirconium and yttrium into powder with the granularity of 5 mu m by utilizing a ball milling or air flow milling process; S2, taking cerium oxide with a fluorite structure as a substrate, respectively adding at least one of 10wt.% of rare earth element praseodymium and lanthanum powder, and at least one of 10wt.% of metal elemen