阅读说明：本技术 永磁材料的稳磁处理方法 (Magnetic stabilization treatment method for permanent magnet material ) 是由 刘雷 闫阿儒 刘壮 张鑫 李�东 孙颖莉 张超越 于 2018-06-14 设计创作，主要内容包括：本发明涉及永磁材料的稳磁处理方法。稳磁处理方法包括以下步骤：提供永磁材料,所述永磁材料具有正矫顽力温度系数；将所述永磁材料在恒定的温度T<Sub>3</Sub>充磁,T<Sub>3</Sub>为-200℃～200℃；以及将充磁后的永磁材料在温度T<Sub>3</Sub>～T<Sub>4</Sub>内随着温度的降低而实现稳磁处理或在恒定温度T<Sub>3</Sub>下进行稳磁处理。本发明稳磁处理方法可以使永磁材料实现快速稳磁,降低磁体后续使用过程中的不可逆磁通损失率,弥补高温稳磁处理的不足,满足装机后不能进行高温稳磁时的应用需求。(The invention relates to a method for stabilizing magnetism of a permanent magnet material. The magnetic stabilization treatment method comprises the following steps: providing a permanent magnetic material, wherein the permanent magnetic material has a positive coercive force temperature coefficient; the permanent magnetic material is put at a constant temperature T 3 Magnetizing, T 3 Is-200 ℃ to 200 ℃; and the magnetized permanent magnetic material is heated at the temperature T 3 ～T 4 Realizing magnetic stabilization treatment with temperature reduction or at constant temperature T 3 Then, the magnetic stabilization treatment is carried out. The method for stabilizing the magnetism can realize rapid stabilization of the magnetism of the permanent magnet material, reduce the irreversible flux loss rate in the subsequent use process of the magnet, make up for the deficiency of high-temperature stabilization treatment, and meet the application requirement when the high-temperature stabilization cannot be carried out after the magnet is installed.)

1. A method for stabilizing magnetism of a permanent magnetic material is characterized by comprising the following steps:

providing a permanent magnetic material, wherein the permanent magnetic material has a positive coercive force temperature coefficient;

subjecting the permanent magnetic material to a temperature T₃Magnetizing, T₃Is-200 to 200 DEG C(ii) a And

the magnetized permanent magnetic material is heated at the temperature T₃～T₄With a reduction in temperature to achieve a magnetic stabilization treatment or at a temperature T₃Then, the magnetic stabilization treatment is carried out.

2. The method of claim 1, wherein the microstructure of the permanent magnetic material comprises a first magnetic phase and a second magnetic phase isolated from each other, the first magnetic phase is a ferromagnetic phase, and the second magnetic phase is a magnetic phase having a spin phase transition.

3. Method for the permanent-magnetic material stabilisation according to claim 1, characterised in that said T is a T₃Is 10-40 ℃.

4. The method for stabilizing the magnetic field of a permanent magnetic material according to claim 1, wherein the temperature range of the positive coercivity temperature coefficient is T₁～T₂At a temperature T₃～T₄T when the magnet-stabilizing treatment is realized along with the reduction of the temperature₂≥T₄。

5. Method for the permanent-magnet material stabilisation of claim 4, characterised in that at temperature T₃When the magnetic stabilization treatment is performed, T₂≥T₃。

6. The method for stabilizing the magnetic field of the permanent magnetic material according to claim 4, wherein the temperature range of the positive coercivity temperature coefficient is 10K to 600K.

7. The method of claim 2, wherein the direction of easy magnetization of the second magnetic phase is changed from the easy base plane to the easy axis with increasing temperature.

8. A method for the permanent-magnet material stabilization according to claim 2, characterized in thatThe first magnetic phase is a SmCo compound, and the second magnetic phase is RCo₅Series compound, RCo₅Derivative compound of (1), R₂Co₁₇Is a compound of formula (I) or R₂Co₁₇A derivative compound of (a); wherein R is selected from one or more of Pr, Nd, Dy, Tb and Ho.

9. The method for stabilizing the magnetic field of the permanent magnet material according to claim 1, wherein the permanent magnet material is a samarium-cobalt based permanent magnet;

the samarium cobalt based permanent magnet comprises a strong magnetic phase (SmHreR)₂(CoM)₁₇A compound of the series, and a magnetic phase (SmHrer) (CoM) having a spin phase transition₅A system compound of the microstructure of the samarium cobalt-based permanent magnet, the (SmHrer) (CoM)₅Is coated with a compound (SmHreR)₂(CoM)₁₇A compound of (a);

wherein Hre is selected from one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; r is selected from one or more of Pr, Nd, Dy, Tb and Ho, M is selected from one or more of Fe, Cu, Zr, Ni, Ti, Nb, Mo, Hf and W, and the SmHrer has at least three elements.

10. The method for stabilizing the magnetic field of the permanent magnetic material according to claim 9, wherein in the samarium cobalt based permanent magnet, the mass percentage of R is 8% to 20%, and the mass percentage of Hre is 8% to 18%.

Technical Field

The invention relates to the technical field of magnetic materials, in particular to a magnetic stabilization treatment method of a permanent magnetic material.

Background

With the wide application of permanent magnetic materials in the fields of electronic and electrical industry, automobile industry, microwave communication, aerospace and the like, new requirements are continuously put forward on the permanent magnetic materials in actual demands. For example, the application of special fields such as inertial instruments, traveling wave tubes and sensors in different environmental fields, the weak change of the magnetism of the permanent magnetic material directly influences the precision of the instruments, brings immeasurable risks to the fields of aerospace, aviation and national defense, limits the execution reliability of unmanned vehicles and intelligent robots, and restricts the development of the fields of national defense, unmanned vehicles, intelligent robots and the like. Therefore, the technical problem of solving the magnetic stability of the permanent magnetic material is urgently needed.

Generally, in the preparation of some devices, if the magnet is magnetized in advance and then assembled, the magnet is influenced by magnetic force, so that the installation is difficult, and the position precision is difficult to control. And if the magnet is not installed, high-temperature magnet stabilization treatment is generally needed after assembly. The principle of the high-temperature magnetic stabilization treatment process is as follows: at high temperature, on one hand, the demagnetization resistance of the magnet is weakened; on the other hand, the influence of thermal disturbance is strengthened, and the unstable magnetization area of the magnet is easy to be magnetized and turned over. Therefore, the magnetizing magnet is processed at a high temperature for a period of time and then returns to a low-temperature environment, and irreversible magnetic flux loss in the subsequent use process of the magnet is reduced due to the overturning of the unstable region, so that the magnet shows better time stability.

However, the temperature of the assembled magnetic material cannot be raised to a proper temperature for magnetic stabilization treatment due to the restriction of factors such as adhesive colloid and device materials, and a technical barrier for difficult magnetic stabilization treatment is created. In addition, high temperature treatment also destroys the texture of the material and deteriorates the performance of the magnet.

Disclosure of Invention

Therefore, in order to solve the above problems, a magnetic stabilization processing method for a permanent magnet material is needed, which can realize rapid magnetic stabilization of the permanent magnet material, reduce the irreversible magnetic flux loss rate in the subsequent use process of the magnet, and meet the application requirement when high-temperature magnetic stabilization cannot be performed after installation.

A method for stabilizing magnetism of a permanent magnetic material comprises the following steps:

providing a permanent magnetic material, wherein the permanent magnetic material has a positive coercive force temperature coefficient;

subjecting the permanent magnetic material to a temperature T₃Magnetizing, T₃Is-200 ℃ to 200 ℃; and

the magnetized permanent magnetic material is heated at the temperature T₃～T₄With a reduction in temperature to achieve a magnetic stabilization treatment or at a temperature T₃Then, the magnetic stabilization treatment is carried out.

In one embodiment, the microstructure of the permanent magnetic material comprises a first magnetic phase and a second magnetic phase which are isolated from each other, the first magnetic phase being a ferromagnetic phase, and the second magnetic phase being a magnetic phase having a spin phase transition.

In one embodiment, the T₃Is 10-40 ℃.

In one embodiment, the temperature interval of the positive coercivity temperature coefficient is T₁～T₂At a temperature T₃～T₄T when the magnet-stabilizing treatment is realized along with the reduction of the temperature₂≥T₄。

In one embodiment, at T₃When the magnetic stabilization treatment is performed, T₂≥T₃。

In one embodiment, the temperature interval of the positive coercivity temperature coefficient is 10K-600K.

In one embodiment, the direction of easy magnetization of the second magnetic phase is turned from the easy base plane to the easy axis as the temperature increases.

In one embodiment, the first magnetic phase is a SmCo compound and the second magnetic phase is RCo₅Series compound, RCo₅Derivative compound of (1), R₂Co₁₇Is a compound of formula (I) or R₂Co₁₇A derivative compound of (a); wherein R is selected fromOne or more of Pr, Nd, Dy, Tb and Ho.

In one embodiment, the permanent magnet material is a samarium cobalt based permanent magnet;

the samarium cobalt based permanent magnet comprises a strong magnetic phase (SmHreR)₂(CoM)₁₇A compound of the series, and a magnetic phase (SmHrer) (CoM) having a spin phase transition₅A system compound of the microstructure of the samarium cobalt-based permanent magnet, the (SmHrer) (CoM)₅Is coated with a compound (SmHreR)₂(CoM)₁₇A compound of (a);

wherein Hre is selected from one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; r is selected from one or more of Pr, Nd, Dy, Tb and Ho, M is selected from one or more of Fe, Cu, Zr, Ni, Ti, Nb, Mo, Hf and W, and the SmHrer has at least three elements.

In one embodiment, in the samarium cobalt-based permanent magnet, the mass percent of R is 8-20%, and the mass percent of Hre is 8-18%.

The magnetic stabilization treatment method of the permanent magnet material has the following advantages:

first, since the permanent magnetic material has a positive coercive force temperature coefficient, it is at a temperature T₃Under the condition of magnetic stabilization treatment or at the temperature T₃～T₄In the process of realizing the magnetic stabilization treatment along with the reduction of the temperature, the demagnetization resistance of the magnet is weakened, so that an unstable magnetization region of the permanent magnet material is turned over, and therefore, the permanent magnet material can realize the rapid magnetic stabilization, the magnetic flux of the permanent magnet material is reduced, the magnetic flux stability is improved, and the irreversible magnetic flux loss rate of the magnet in the subsequent use process is reduced.

Secondly, in the above method for stabilizing the magnetization of the permanent magnet material, the temperature of magnetization is T₃Temperature of the magnetic stabilization treatment is T₃Or at a temperature T₃～T₄Internal magnetization stabilizing treatment is realized along with the reduction of temperature, and T₃＞T₄Therefore, in the process of stabilizing the magnetism, the magnetizing magnet does not need to be heated to high temperature for stabilizing the magnetism, the stabilization treatment of the magnetism can be realized, and the high-temperature stabilization treatment is compensatedAnd (4) deficiency.

Thirdly, the magnetic stabilization treatment method for the permanent magnet material is simple and efficient, is less restricted by temperature and time, can realize the effect of rapid magnetic stabilization, meets the requirement of realizing the effect of magnetic stabilization after most finished devices or systems are integrally assembled, and has wider practicability.

Drawings

FIG. 1 is a graph showing the AC magnetic susceptibility test of a permanent magnetic material according to example 1 of the present invention;

fig. 2 is a coercive force temperature dependence graph of the permanent magnetic material of embodiment 1 of the present invention;

FIG. 3 is a graph showing the change in magnetic moment during the magnetic stabilization treatment of the permanent magnetic materials of examples 1 to 3 and comparative examples 1 to 4 of the present invention; in the figure, a is a magnetic moment variation curve of the permanent magnetic material of example 1 in the process of magnetic stabilization treatment, b is a magnetic moment variation curve of the permanent magnetic material of example 2 in the process of magnetic stabilization treatment, c is a magnetic moment variation curve of the permanent magnetic material of example 3 in the process of magnetic stabilization treatment, d is a magnetic moment variation curve of the permanent magnetic material of comparative example 1 in the process of magnetic stabilization treatment, e is a magnetic moment variation curve of the permanent magnetic material of comparative example 2 in the process of magnetic stabilization treatment, f is a magnetic moment variation curve of the permanent magnetic material of comparative example 3 in the process of magnetic stabilization treatment, and g is a magnetic moment variation curve of the permanent magnetic material of comparative example 4 in the process of magnetic stabilization treatment;

fig. 4 is a graph showing the coercive force temperature dependence of the permanent magnetic materials of example 3, comparative example 1 and comparative example 5 of the present invention; in the figure, h is a coercive force temperature dependence curve of the permanent magnet material of example 3, i is a coercive force temperature dependence curve of the permanent magnet material of comparative example 1, and j is a coercive force temperature dependence curve of the permanent magnet material of comparative example 5;

FIG. 5 is an AC susceptibility test chart of a permanent magnetic material of comparative example 6 of the present invention;

FIG. 6 is a graph showing the coercive force temperature dependence of the permanent magnetic material of comparative example 6 of the present invention;

FIG. 7 is a graph showing the variation of magnetic moment during the magnetic stabilization treatment of the permanent magnetic materials of comparative examples 6 to 11 according to the present invention; in the figure, k is a magnetic moment variation curve of the permanent magnetic material of the comparative example 6 in the magnetic stabilization treatment process, m is a magnetic moment variation curve of the permanent magnetic material of the comparative example 7 in the magnetic stabilization treatment process, n is a magnetic moment variation curve of the permanent magnetic material of the comparative example 8 in the magnetic stabilization treatment process, and o is a magnetic moment variation curve of the permanent magnetic material of the comparative example 9 in the magnetic stabilization treatment process; p is a magnetic moment variation curve of the permanent magnetic material of comparative example 10 in the magnetic stabilization treatment process, and q is a magnetic moment variation curve of the permanent magnetic material of comparative example 11 in the magnetic stabilization treatment process.

Detailed Description

The low-temperature magnetic stabilization treatment method of the permanent magnetic material provided by the invention is further explained below.

In the prior art, it is a common method to obtain the effect of magnetic stabilization by high temperature treatment. But the magnetic stabilization effect obtained by low-temperature treatment cannot be generally obtained by a specific rule. The previous patent applications (application numbers: 201410663449.6 and 201710243774.0) of the applicant protect permanent magnetic materials with positive coercivity temperature coefficients, and only protect technical solutions of permanent magnetic materials with positive coercivity temperature coefficients and permanent magnetic materials with low coercivity temperature coefficients.

The invention provides a magnetic stabilization treatment method of a permanent magnet material, which comprises the following steps:

s1, providing a permanent magnet material, wherein the permanent magnet material has a positive coercive force temperature coefficient;

s2, heating the permanent magnetic material at the temperature T₃Magnetizing, T₃Is-200 ℃ to 200 ℃; and

s3, magnetizing the permanent magnetic material at the temperature T₃～T₄Realizing magnetic stabilization treatment with temperature reduction or at constant temperature T₃Then, the magnetic stabilization treatment is carried out.

In step S1, the permanent magnetic material is not limited, and may have a positive coercivity temperature coefficient, such as commercial ferrite.

Preferably, the microstructure of the permanent magnetic material includes a first magnetic phase and a second magnetic phase that are isolated from each other, the first magnetic phase is a ferromagnetic phase, and the second magnetic phase is a magnetic phase having a spin phase transition.

The size of the microstructure is 5nm to 800nm in at least one dimension.

The first magnetic phase and the second magnetic phase are isolated in a wrapping isolation mode and a layer separation isolation mode. For example, the first magnetic phase may be wrapped by the second magnetic phase, the second magnetic phase may be wrapped by the first magnetic phase, and the first magnetic phase and the second magnetic phase may be interlaced layer by layer. The isolation method is related to a specific preparation method of the permanent magnet material, and in order to form a two-phase isolated structure, the preparation method of the permanent magnet material is preferably a powder metallurgy method, a sputtering method, an electroplating method and a diffusion method. The permanent magnet materials obtained by the sputtering method and the diffusion method are generally in a layer-spacing isolation manner, and the permanent magnet materials obtained by the powder metallurgy method and the electroplating method are generally in a wrapping isolation manner.

The second magnetic phase is a magnetic phase having a spin phase transition, and the magnetic phase having a spin phase transition is RCo₅Series compound, RCo₅Derivative compound of (1), R₂Co₁₇Is a compound of formula (I) or R₂Co₁₇Wherein R is selected from one or more of Pr, Nd, Dy, Tb and Ho. Wherein the derivative compound is referred to as constituting RCo₅Is a compound of formula (I) or R₂Co₁₇One or more elements of the series of compounds are partially substituted with other elements. Preferably, R may be partially substituted with Sm or a combination of Sm and Hre and Co may be partially substituted with M. Hre is selected from one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and M is selected from one or more of Fe, Cu, Zr, Ni, Ti, Nb, Mo, Hf and W, for example, Sm_1-xDy_xCo₅(x is more than 0 and less than 1) is RCo₅A derivative compound of (1).

The first magnetic phase is a ferromagnetic phase, which is a magnetic phase having uniaxial anisotropy. Preferably, the ferromagnetic phase is generally a SmCo-based compound, and the Sm moiety is substituted with a combination of Hre or Hre and another element (e.g., an R element different from Hre), preferably Sm₂Co₁₇、SmCo₅Or SmCo₇The Sm part in the compound is Hre and R. Preferably, Co may also be partially substituted by M.

Preferably, R and Hre in the ferromagnetic phase contain different elements, that is, Sm in the ferromagnetic phase is partially substituted with at least two elements selected from the group consisting of Hre and R to form a ternary or higher composition.

R, M and Hre in the ferromagnetic phase may be the same as or different from, preferably the same as, R, M and Hre in the spin-phase-transformed magnetic phase, respectively. In general, when the magnetic phases having spin phase transition are different, the spin phase transition temperature is also different. For example, DyCo₅The compound is turned from an easy surface to an easy axis in an easy magnetization direction of 370K, and the 370K is DyCo₅The spin phase transition temperature of the compound; TbCo₅The compound is turned from an easy surface to an easy axis in the easy magnetization direction of 410K, and 410K is TbCo₅Spin phase transition temperature of the compound. Therefore, a desired spin phase transition temperature and, in turn, a desired temperature coefficient interval of the positive coercivity can be obtained by selecting a magnetic phase having a spin phase transition.

Preferably, the permanent magnet material is a samarium cobalt-based permanent magnet. The samarium cobalt-based permanent magnet mainly comprises an Sm element, a Co element, an Hre element, an R element and an M element, wherein Hre is selected from one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, R is selected from one or more of Pr, Nd, Dy, Tb and Ho, M is selected from one or more of Fe, Cu, Zr, Ni, Ti, Nb, Mo, Hf and W, and SmHrer comprises at least three elements. And in the samarium cobalt based permanent magnet, the strong magnetic phase is (SmHreR)₂(CoM)₁₇A compound having a spin phase transition and a magnetic phase of (SmHrer) (CoM)₅Is a compound of formula (SmHreR) (CoM)₅The series compound (also called cell wall) wraps the (SmHreR)₂(CoM)₁₇Is a compound (also known as the intracellular phase).

It is understood that the above (SmHreR)₂(CoM)₁₇Series Compound and (SmHrer) (CoM)₅The series of compounds are represented by a series of compounds containing Sm, Co, Hre, R and M, but the ratio of Sm, Hre and R is not limited to 1:1:1, or the ratio of Co and M is not limited to 1: 1.

Hre and R may each include at least one of Dy, Tb and Ho, and the content of Dy, Tb and Ho in R and Hre is repeatedly calculated, when Hre includes at least one of Tb, Dy and Ho, the Tb, Dy and/or Ho are simultaneously used as R to calculate the mass percentage content of R. For example, when Hre contains at least one of Dy, Tb, and Ho, R is the mass percentage of Tb, Dy, and/or Ho plus the mass percentage of the other elements.

In order to ensure the magnetic stabilization effect of low-temperature treatment, preferably, in the samarium-cobalt-based permanent magnet, the mass percentage of R is 8-20%, and the mass percentage of Hre is 8-18%.

Since the easy axis of the magnetic phase with spin phase transition changes with the temperature, in one embodiment, the easy magnetization direction of the magnetic phase with spin phase transition is changed from the easy base to the easy axis with the temperature. There are many permanent magnets according with the magnetic phase transition law, such as the above-mentioned samarium cobalt-based permanent magnet.

The permanent magnet material has a positive coercivity temperature coefficient within a certain temperature interval, and the temperature interval of the positive coercivity temperature coefficient is T₁～T₂I.e. at T₁～T₂The coercive force decreases with decreasing temperature. When the temperature range of the positive coercivity temperature coefficient of the permanent magnet material is 10K-600K, or more preferably 100K-600K, the permanent magnet material has better magnetic performance, and at the moment, the permanent magnet material after low-temperature magnetic stabilization has higher practical application value. Therefore, the temperature range of the positive coercivity temperature coefficient of the permanent magnet material is preferably 10K to 600K, and more preferably 100K to 600K.

The spin phase transition temperature of the magnetic phase with spin phase transition determines the temperature interval of the positive coercivity temperature coefficient to a certain extent, so that the temperature interval with the positive coercivity temperature coefficient can be adjusted by adjusting the spin phase transition temperature, and of course, can also be adjusted by other methods, so that the magnetic stabilization processing method can meet the application of permanent magnetic materials in different aspects.

The permanent magnetic material is at temperature T₃Under the condition of magnetic stabilization treatment or at the temperature T₃～T₄In the process of realizing the magnetic stabilization treatment along with the reduction of the temperature, the demagnetization resistance of the magnet body is weakened, so that the permanent magnet materialThe easy magnetization direction of the second magnetic phase of the material is easy to change from a basal plane to an easy axis. In the transformation process, because the magnetocrystalline anisotropy parameter of the second magnetic phase is very small, the unstable magnetization region is prompted to rapidly turn over, so that the permanent magnetic material can realize rapid magnetic stabilization, the magnetic flux of the permanent magnetic material is reduced, the magnetic flux stability is improved, and the irreversible magnetic flux loss rate in the subsequent use process of the magnet is reduced.

In step S2, the temperature T of magnetization₃Is-200 to 200 ℃. Considering that the higher the magnetizing temperature is, the larger the damage to the permanent magnet material structure is, and the larger the operation difficulty is. Meanwhile, in order to complete the magnetic stabilization treatment in a low-temperature environment, it is preferable that the magnetizing temperature T of the present invention is set₃Is 10-40 ℃.

In step S3, the permanent magnetic material may be stabilized at a constant temperature T₃Can also be carried out at a temperature T₃～T₄The magnetism stabilizing treatment is realized along with the reduction of the temperature. Of course, time is an essential element in addition to temperature for the magnetic stabilization treatment of permanent magnetic materials. After the permanent magnetic material is magnetized, the magnet is in a high-energy state, and at the moment, if the temperature T is at the magnetizing temperature₃And the magnet needs to be placed for a longer time to realize the magnet stabilization treatment. At a temperature T₃～T₄In the process of realizing the magnetic stabilization treatment along with the reduction of the temperature, the demagnetization resistance of the magnet is weakened, so that an unstable magnetization region of the permanent magnet material is turned over, therefore, the permanent magnet material can realize the rapid magnetic stabilization, the magnetic flux of the permanent magnet material is reduced, the magnetic flux stability is improved, and the irreversible magnetic flux loss rate of the magnet in the subsequent use process is reduced. Therefore, to achieve rapid magnetic stabilization, it is preferable to stabilize the magnetic field at the temperature T₃～T₄The magnetism stabilizing treatment is realized along with the reduction of the temperature.

The necessary condition for the permanent magnetic material to achieve rapid magnetic stabilization is that the self anti-demagnetization field capability is relatively weak, and when the temperature of the magnetic stabilization treatment is higher than the maximum value T of the temperature interval of the positive coercive force temperature coefficient₂When the permanent magnet material is used, the self demagnetization field capacity of the permanent magnet material is strong, and the effect of magnetic stabilization is basically not generated. Thus, when at a constant temperature T₃When the magnetic stabilization treatment is performed, T₃≤T₂Preferably T₃＜T₂(ii) a When at the temperature T₃～T₄T is required when realizing the magnetic stabilization treatment along with the reduction of the temperature₄≤T₂Preferably T₄＜T₂。

When T is₃＞T₄、T₂＞T₄The magnetic stabilization treatment method is less influenced by temperature and time, and at the moment, when T is less influenced₄≤T₁And then, the irreversible magnetic flux loss rate of the permanent magnet material after the magnetic stabilization treatment tends to be stable and does not increase along with the reduction of the temperature, so the magnetic stabilization treatment method is a more efficient and uniform magnetic stabilization treatment method.

The method for stabilizing the magnetism of the permanent magnet material does not need to be carried out at high temperature, meets the requirement of the application field that the permanent magnet material cannot be aged at high temperature after being installed, makes up the defect of high-temperature magnetic stabilization treatment, and has wider practicability.

The low-temperature magnetic stabilization treatment method of the permanent magnet material has the following advantages: first, since the permanent magnetic material has a positive coercive force temperature coefficient, it is at a temperature T₃Under the condition of magnetic stabilization treatment or at the temperature T₃～T₄In the process of realizing the magnetic stabilization treatment along with the reduction of the temperature, the demagnetization resistance of the magnet is weakened, so that an unstable magnetization region of the permanent magnet material is turned over, and therefore, the permanent magnet material can realize the rapid magnetic stabilization, the magnetic flux of the permanent magnet material is reduced, the magnetic flux stability is improved, and the irreversible magnetic flux loss rate of the magnet in the subsequent use process is reduced. Secondly, in the above method for stabilizing the magnetization of the permanent magnet material, the temperature of magnetization is T₃Temperature of the magnetic stabilization treatment is T₃Or at a temperature T₃～T₄Internal magnetization stabilizing treatment is realized along with the reduction of temperature, and T₃＞T₄Therefore, in the process of the magnetic stabilization treatment, the magnetizing magnet does not need to be heated to high temperature for the magnetic stabilization treatment, the magnetic stabilization treatment can be realized, and the defect of the high-temperature magnetic stabilization treatment is overcome. Thirdly, the magnetic stabilization treatment method of the permanent magnet material is simple and efficient, is less restricted by temperature and time, can realize the effect of rapid magnetic stabilization, and meets the requirement that most finished devices or systems realize magnetic stabilization after being integrally assembledThe effect is more practical.

Hereinafter, the method for low-temperature magnetic stabilization of the permanent magnetic material will be further described by the following specific examples.