KR20230125298A - Double angle niodymium iron boron magnetic material and its manufacturing method - Google Patents

Abstract

The present invention discloses a double horn layer niodymium iron boron magnetic material and a manufacturing method thereof. This double-corner layer niodymium iron boron magnetic material includes columnar crystal grains, the double-corner layer and an Nd-rich phase adjacent to the columnar grains; the columnar crystal grains contain R ₂ Fe ₁₄ B; and the inner layer of the double-corner layer (Nd/ Ho) ₂ Fe ₁₄ B and/or (Nd/Gd) ₂ Fe ₁₄ B; the outer layer of the double layer comprises (Nd/Dy) ₂ Fe ₁₄ B and/or (Nd/Tb) ₂ Fe ₁₄ B and; the thickness of the double layer is 0.1 to 6 μm; and the Nd-rich phase includes a (R-RH) ₆ T ₁₃ X phase. According to the present invention, it is possible to obtain a double horn layer niodymium iron boron magnetic material in which a thin prismatic layer is formed around the main phase and the diffusion amount of the heavy rare earth element as the main phase is effectively reduced.

Description

Double angle niodymium iron boron magnetic material and its manufacturing method

The present invention relates to a double-shell niodymium iron boron magnetic material and a manufacturing method thereof.

In recent years, with the continuous improvement of green travel, energy saving and environmental protection, the demand for high coercivity sintered NdFeB magnet steel in electric vehicles, inverter air conditioner compressors and wind power generation is constantly increasing. At present, the production of high coercivity sintered NdFeB magnet steel is mainly realized by substituting light rare earth elements through heavy rare earth elements Dy and/or Tb, which increases the raw material cost of sintered NdFeB, while also adding heavy rare earth elements to the magnetic body. lowers the residual magnetism of the magnetic material and sacrifices some of the magnetoenergetic product of the magnetic material.

In the existing technology, the performance of the magnetic body can be improved through the binary alloy method. The binary alloy method realizes the formula for the crystal grain boundary of the main phase alloy granules by refining and crushing the main alloy and auxiliary alloy respectively, mixing and sintering the raw materials, and changing the powder raw material components and mixing ratio of the auxiliary alloy. will be. However, since the temperature of the sintering step is relatively high, heavy rare earth elements such as Dy and Tb added as an auxiliary phase diffuse in large quantities and enter the main phase to lower the residual magnetism of the magnetic body; At the same time, heavy rare earth elements diffuse in large quantities and enter the main phase, and the concentration of heavy rare earth elements in each outer layer of the columnar granules decreases, so that the enhancement value of the heavy rare earth elements for the coercive force is distributed on the grain surface to change the grain boundary structure. It is smaller than the effect of improvement, which lowers the utilization rate of heavy rare earth and limits the improvement of coercive force.

Patent document CN111636035A discloses a medium rare earth alloy, a neodymium iron boron permanent magnet material, a raw material, and a manufacturing method. And / or by deducting the content of Zr and the total amount of heavy rare earth elements, Ti and / or Zr are combined with B, avoiding the excessive combination of heavy rare earth metal and B, and diffusion amount of heavy rare earth metal into the main phase The performance of the magnetic material is improved by reducing The thickness of each layer formed from the outside is relatively deep.

Therefore, it is necessary to find a new method that can reduce the degree of diffusion of heavy rare earth elements into the main phase by effectively forming a thin horn layer around the main phase of expensive heavy rare earth elements such as Dy and Tb.

The present invention provides a double layered niodymium iron boron magnetic body and a method for manufacturing the same in order to solve the problem of diffusion of heavy rare earth elements into a large amount of main phase in the case of a binary alloy method among existing technologies. According to the present invention, a double horn layer niodymium iron boron magnetic material in which a thin prismatic layer is formed around the main phase and the amount of diffusion of heavy rare earth elements as the main phase is effectively reduced can be obtained.

The present invention solves the above technical problem through the following technical means.

The present invention provides a double horn layer niodymium iron boron magnetic material comprising columnar crystal grains, a double horn layer thereof, and an Nd-rich phase adjacent to the columnar crystal grains;

The columnar crystal grains include R ₂ Fe ₁₄ B; wherein R is at least one of La, Ce, Pr, and Nd;

The inner layer of the bicorne layer contains (Nd/Ho) ₂ Fe ₁₄ B and/or (Nd/Gd) ₂ Fe ₁₄ B;

The outer layer of the bicorne layer contains (Nd/Dy) ₂ Fe ₁₄ B and/or (Nd/Tb) ₂ Fe ₁₄ B;

The thickness of the double layer is 0.1 to 6 μm;

Among the Nd-rich phases, (R-RH) ₆ T ₁₃ X phase is included, RH is at least one of Ho, Gd, Dy and Tb, T is Fe and/or Co, and X is one of Ga, Cu and Al More than that.

In the present invention, preferably, the inner layer of the bicorne layer contains (Nd/Ho) ₂ Fe ₁₄ B.

In the present invention, preferably, the outer layer of the bicorne layer contains (Nd/Dy) ₂ Fe ₁₄ B.

In the present invention, preferably, the Nd-rich phase includes further ZrB ₂ and TiB ₂ .

In addition, the present invention provides a method for manufacturing the above-described double angle layer niodymium iron boron magnetic body, which includes the following procedures:

S1. Process for producing and obtaining the main alloy sheet, the first auxiliary alloy sheet, and the second auxiliary alloy sheet respectively;

Here, the raw material of the first auxiliary alloy sheet includes LH ₁ , RH ₁ , X ₁ and Fe; the LH ₁ is At least one of La, Ce, Pr, and Nd, wherein RH ₁ is Ho and/or Gd, and X ₁ is at least one of Cu, Co, Ga, and Al; in the first auxiliary alloy sheet, the LH ₁ The mass percentage occupied is 0 to 80%, the mass percentage occupied by RH ₁ is 5 to 80%, and the LH ₁ and The mass percentage occupied by the total amount of RH ₁ in the first supplementary alloy sheet is 30% or more, and the mass percentage occupied by X ₁ in the first supplementary alloy sheet is 1 to 15%; The sum of the mass percentages of elements is 100%;

The raw material of the second auxiliary alloy sheet includes RH ₂ , X2 and Fe; the RH ₂ is Dy and/or Tb, and the X ₂ is Zr and/or Ti; in the second auxiliary alloy sheet, the The mass percentage occupied by RH ₂ is 0 to 80%, excluding 0, and the mass percentage occupied by X ₂ in the second supplementary alloy sheet is 3 to 10%; each element in the second supplementary alloy sheet The sum of the mass percentages is 100%;

S2. Procedure for obtaining the double layered niodymium iron boron magnetic material by subjecting the mixture of the main alloy sheet, the first auxiliary alloy sheet, and the second auxiliary alloy sheet to hydrogen crushing or pulverization to a molding and sintering treatment

includes

In S1, preferably, the melting point of the first auxiliary alloy sheet is lower than the melting point of the second auxiliary alloy sheet.

In S1, preferably, the mass percentage of LH ₁ in the first supplementary alloy sheet is 0 to 60% (except for 0), for example, 30%.

In S1, preferably, the LH ₁ is Pr and/or Nd.

In S1, preferably, when Pr is included in the raw material of the first auxiliary alloy sheet, the mass percentage of Pr in the first auxiliary alloy sheet is 0 to 60%, for example 7.5%.

In S1, preferably, when Nd is included in the raw material of the first auxiliary alloy sheet, the mass percentage of Nd in the first auxiliary alloy sheet is 0 to 60%, for example 22.5%.

In S1, preferably, the mass percentage of RH ₁ in the first supplementary alloy sheet is 20 to 50%.

Among S1, preferably, the mass percentage of the total amount of LH ₁ and RH ₁ occupied in the first supplementary alloy sheet is 50% or more.

Among S1, X ₁ is preferably Cu and/or Co.

Among S1, preferably, the mass percentage of X ₁ in the first auxiliary alloy sheet is 5 to 12%, more preferably 5 to 10%.

Here, preferably, when the X ₁ includes Cu, the mass percentage of Cu occupied in the first supplementary alloy sheet is 1 to 6%, for example, 5%.

Here, preferably, when the X ₁ includes Co, the mass percentage of Co in the first supplementary alloy sheet is 1 to 6%, for example 5%.

In S1, preferably in the first auxiliary alloy sheet, the mass percentage of Fe occupied is 50% or less, more preferably 39 to 45%, for example 39.5% or 44.7%.

In S1, preferably, B is included in the raw material of the first auxiliary alloy sheet, and in the first auxiliary alloy sheet, the mass percentage of B is 0 to 0.6%, and 0 is excluded, for example 0.3% or 0.5%.

In S1, in a preferred embodiment, the raw material of the first auxiliary alloy is composed of the following components: Ho content 50%; Cu content 5%; Fe content 44.7%; B content 0.3%; Percentage Means the mass percentage of the component in the raw material of the first supplementary combination.

In S1, in a preferred embodiment, the raw material of the first auxiliary alloy includes the following components: Pr content 7.5%; Nd content 22.5%; Ho content 20%; Cu content 5%; Co content 5%; Fe content 39.5%; B content 0.5%; Percentage means the mass percentage of the component in the raw material of the first auxiliary alloy.

During S1, preferably, the raw material of the first auxiliary alloy sheet is subjected to melting and smelting and casting to obtain the first auxiliary alloy sheet.

Here, preferably, the melting and smelting temperature of the raw material of the first auxiliary alloy sheet is 1000° C. or higher.

Here, the casting of the first auxiliary alloy sheet may be a conventional casting process in this field, for example, a strip continuous casting method, an ingot casting method, a centrifugal casting method, or a rapid quenching method.

In S1, preferably, the mass percentage of RH ₂ occupied in the second supplementary alloy sheet is 50 to 80%, for example, 58% or 63%.

Among S1, preferably, the mass percentage of X ₂ occupied in the second auxiliary alloy sheet is 6 to 10%.

In S1, preferably, when X ₂ includes Zr, the mass percentage of Zr in the second supplementary alloy sheet is 6 to 10%.

In S1, preferably, the raw material of the second auxiliary alloy sheet includes advanced LH ₂ , the LH ₂ is at least one of La, Ce, Pr, and Nd, and the LH ₂ occupies in the second auxiliary alloy sheet The mass percentage is 80% or less, and 0 is excluded.

In S1, preferably, B is included in the raw material of the second auxiliary alloy sheet, and the mass percentage of B in the second auxiliary alloy sheet is 0 to 0.6%, and 0 is excluded, for example It is 0.5%.

In S1, in a preferred embodiment, the raw material of the second auxiliary alloy is composed of the following components: Dy content 58%; Zr content 6%; Fe content 36%; It means the mass percentage of the component in the raw material of

In S1, in a preferred embodiment, the raw material of the second auxiliary alloy is composed of the following components: Dy content 63%; Zr content 6%; Fe content 30.5%; B content 0.5%; Percentage Means the mass percentage of the component in the raw material of the second auxiliary combination.

In S1, in a preferred embodiment, the raw material of the second auxiliary alloy is composed of the following components: Dy content 58%; Zr content 6%; Fe content 35.5%; B content 0.5%; percentage Means the mass percentage of the component in the raw material of the second auxiliary combination.

During S1, preferably, the raw material of the second auxiliary alloy sheet is subjected to melting and smelting and casting to obtain the second auxiliary alloy sheet.

Here, preferably, the melting and smelting temperature of the raw material of the second auxiliary alloy sheet is 1300° C. or higher.

Here, the casting of the second auxiliary alloy sheet may be a conventional casting process in the field, for example, a strip continuous casting method, an ingot casting method, a centrifugal casting method, or a rapid quenching method.

In S1, preferably, the raw material of the main alloy sheet includes LH ₃ , X ₃ , Y ₃ , Fe and B; LH ₃ is Pr and/or Nd, and X ₃ is Zr, Ti and Nb At least one, wherein Y ₃ is at least one of Cu, Al, Ga, and Co, and Y ₃ must include Cu; in the main alloy sheet, the mass percentage occupied by LH ₃ is 27 to 35% And, the mass percentage of X ₃ in the main alloy sheet is 0.05 to 0.8%; the sum of the mass percentages of each element in the main alloy sheet is 100%.

Here, preferably, the mass percentage of the LH ₃ in the main alloy sheet is 27 to 30%, for example 27.6%, 28% or 29%.

Here, preferably, the mass percentage occupied by the X ₃ in the main alloy sheet is 0.1 to 0.6%, more preferably 0.2 to 0.3%, for example 0.22%.

Here, preferably, the mass percentage of Y ₃ in the main alloy sheet is 0.75 to 2.5%, for example, 1.15% or 2.06%.

Here, the mass percentage of Cu in the main alloy sheet is preferably 0.1 to 0.6%, for example 0.21% or 0.25%.

Here, preferably, in the main alloy sheet, when the Y ₃ includes Al, the mass percentage of Al in the main alloy sheet is 0.02 to 1.2%, for example 0.4%.

Here, preferably, in the main alloy sheet, when Y ₃ includes Ga, the mass percentage of Ga occupied in the main alloy sheet is 0.25 to 0.4%, for example 0.26%.

Here, preferably, in the main alloy sheet, when the Y ₃ includes Co, the mass percentage of Co occupied in the main alloy sheet is 0.5 to 1.2%, for example 1.19%.

Here, preferably, in the main alloy sheet, the mass percentage occupied by B is 0.97 to 1%.

Here, preferably, the raw material of the main alloy sheet further includes RH ₃ , the RH ₃ is Dy and/or Tb, and the mass percentage of the RH ₃ in the main alloy sheet is 0 to 3%, and 0 is excluded.

In S1, in a preferred embodiment, the raw material of the main alloy includes the following components: Nd content 27.6%; Dy content 3%; Ga content 0.26%; Al content 0.4%; Cu content 0.21%; Co content 1.19%; Ti content 0.2%; Nb content 0.02%; B content 1%; Fe content 66.12%; percentage means the mass percentage of the component in the raw material of the main alloy.

In S1, in a preferred embodiment, the raw material of the main alloy includes the following components: Pr content 7%; Nd content 21%; Dy content 3%; Ga content 0.4%; Cu content 0.25%; Co content 0.5%; Zr content 0.2%; B content 0.97%; Fe content 66.68%; percentage means the mass percentage of the component in the raw material of the main alloy.

In S1, in a preferred embodiment, the raw material of the main alloy includes the following components: Pr content 7.25%; Nd content 21.75%; Dy content 1%; Ga content 0.4%; Cu content 0.25%; Co content 0.5%; Zr content 0.2%; B content 0.97%; Fe content 67.68%; percentage means the mass percentage of the component in the raw material of the main alloy.

During S1, preferably, the raw material of the main alloy sheet is subjected to melting and smelting and casting to obtain the main alloy sheet.

Here, preferably, the melting and refining temperature of the raw material of the main alloy sheet is 1400 ° C. or higher.

Here, the casting of the main alloy sheet may be a common casting process in this field, for example, a strip continuous casting method, an ingot casting method, a centrifugal casting method, or a rapid quenching method.

In S2, the mass percentage of the amount of the first auxiliary alloy sheet and the second auxiliary alloy sheet in the amount of the raw material of the double layer niodymium iron boron magnetic material is preferably greater than 1% and less than 15%, and more Preferably 5%; The raw material of the double angle niodymium iron boron magnetic material is the main alloy sheet, the first auxiliary alloy sheet and the second auxiliary alloy sheet.

In S2, preferably, the mixture of the main alloy sheet and the auxiliary alloy sheet is subjected to hydrogen crushing, pulverization, molding and sintering to obtain the double layer niodymium iron boron magnetic material;

Alternatively, the main alloy sheet and the auxiliary alloy sheet are subjected to hydrogen crushing, respectively, and the coarse powder after the hydrogen crushing of the main alloy sheet and the auxiliary alloy sheet is further mixed, and the coarse powder after further mixing is pulverized, subjected to molding and sintering to obtain the double-layer niodymium iron boron magnetic body;

Alternatively, hydrogen crushing and pulverization of the main alloy sheet and the auxiliary alloy sheet, respectively, mixing of the main alloy sheet and the auxiliary alloy sheet after pulverization, and further forming and sintering the powder after mixing Thus, the double-cornered niodymium iron boron magnetic material is obtained.

Here, the operation and conditions of the hydrogen cracking may be conventional operations and conditions in the field. The dehydrogenation temperature of the hydrogen crushing may be 400 ° C to 650 ° C, for example, 500 to 620 ° C.

Here, the pulverization process may be a conventional pulverization process in this field, for example, pulverization by a jet mill, and is preferably carried out in an atmosphere with an oxygen content of 50 ppm or less. The particle size of the powder after pulverization may be 2 to 7 μm, for example, 3.0 to 5.3 μm.

Here, the molding conditions may be conventional conditions in the field, for example, the magnetic field strength is 0.5T to 3.0T, for example, pressed with a green compact in a pressure machine of 1.0 to 2.0T.

Here, the conditions of the sintering treatment may be common conditions in the art. The temperature of the sintering may be 1000 ~ 1150 ℃, for example 1050 ~ 1085 ℃.

On the basis of common sense in this field, each preferred embodiment of the present invention can be obtained by arbitrarily combining each of the above preferred conditions.

All of the reagents and raw materials used in the present invention can be obtained commercially.

The positive and progressive effects of the present invention lie in the following points.

According to the present invention, inexpensive heavy rare earth layers of Ho and/or Gd are first formed around the main phase, and excessive diffusion of expensive rare earth elements such as Dy and/or Tb into the main phase is suppressed so that Dy and/or Tb is thin around the main phase. A double layered niodymium iron boron magnetic body is obtained that forms a single layer, effectively reduces the diffusion amount of heavy rare earth elements Dy and/or Tb as a main phase, and achieves the effect of reducing the amount of Dy and Tb used under equivalent performance.

1 is an EMPA diagram of a sample in Example 1.
Fig. 2 is a line scanning result of Ho and Dy element components of the sample in Example 1;

The present invention is further described by way of examples below, but the present invention is not limited to the scope of the following examples.

Example 1

(1) According to the formulation shown in Table 1, a main alloy sheet, a first auxiliary alloy sheet, and a second auxiliary alloy sheet were prepared, respectively.

Here, the melting and refining temperature of the main alloy sheet was about 1400 to 1600 ° C. Then, casting was performed through a rapid quenching method to obtain a master alloy sheet.

The melting and smelting temperature of the first auxiliary alloy sheet was about 1400 to 1600 ° C. Then, a first auxiliary alloy sheet was obtained by casting through a rapid quenching method.

The melting and smelting temperature of the second auxiliary alloy sheet was about 1400 to 1600 ° C. Then, a second auxiliary alloy sheet was obtained by casting through a rapid quenching method.

(2) Hydrogen crushing process: The mixture of the main alloy sheet, the first auxiliary alloy sheet and the second auxiliary alloy sheet in step (1) at room temperature was subjected to hydrogen crushing treatment at 500 to 620 ° C to obtain a crude pulverized powder.

(3) Finely pulverized treatment: The prepared pulverized powder in step (2) was finely pulverized in a jet mill in an atmosphere with an oxygen content of 50 ppm or less to obtain a finely pulverized powder having an average particle diameter of D50 = 3.0 to 5.3 μm.

(4) Forming process: Pressed with a green compact in a pressure vessel with a magnetic field strength of 1.0 to 2.0 T, and then held for 15 s under a pressure of 260 MPa to obtain a molded product.

(5) Sintering process: The molded body was sintered at a temperature of 1050 to 1085°C to obtain a double horn layer niodymium iron boron magnetic body. The sintering atmosphere was a vacuum or argon gas atmosphere.

Amount of each element of the main alloy sheet, the first auxiliary alloy sheet and the second auxiliary alloy sheet of Examples 1 to 3 element Example 1 Example 2 Example 3 main alloy sheet
(A seat) Pr / 7 7.25 Nd 27.6 21 21.75 Dy 3 3 One Ga 0.26 0.4 0.4 Al 0.4 / / Cu 0.21 0.25 0.25 Co 1.19 0.5 0.5 Ti 0.2 / / Zr / 0.2 0.2 Nb 0.02 / / B One 0.97 0.97 Fe 66.12 66.68 67.68 1st subsidy sheet
(B seat) Pr / 7.5 7.5 Nd / 22.5 22.5 Ho 50 20 20 Cu 5 5 5 Co / 5 5 Fe 44.7 39.5 39.5 B 0.3 0.5 0.5 2nd subsidy sheet
(C seat) Dy 58 63 58 Zr 6 6 6 Fe 36 30.5 35.5 B / 0.5 0.5 A seat: B seat: Mass ratio of C seat 95:2:3 95:3:2 95:2:3

Here, "/" indicates that the element is not contained. Examples 2 to 3

Except for the different amounts of the raw materials shown in Table 1, all other process conditions were the same as in Example 1 to obtain a double-cornered niodymium iron boron magnetic material.

Effect Example

Measurement of magnetic properties: The magnetic properties of the double-cornered niodymium iron boron magnetic material were detected using a PFM14.CN molded ultra-high coercive permanent magnet measuring instrument from China Metrology Institute.

Example 1 Example 2 Example 3 Formation of stratum corneum you you you Each layer thickness (μm) 0.1 to 6 0.1 to 6 0.1 to 6 Coercivity (kOe) 29.3 28.7 24.0 Residual magnetism (kGs) 12.3 12.6 13.2

In the present invention, through the adjustment of the mixing of the first auxiliary alloy sheet, the second auxiliary alloy sheet and the main alloy sheet, the melting point of the first auxiliary alloy sheet is lower than the melting point of the second auxiliary alloy sheet, thereby sintering The first auxiliary alloy sheet melts before the second auxiliary alloy sheet and spreads around the main phase to form the inner layer of the double shell layer first, and then the outer layer of the double shell layer containing Dy and / or Tb as a heavy rare earth element. was formed, allowing Dy and/or Tb to form a stratum corneum only on the outermost surface. ，Can achieve the effect of H _cj enhancement. Looking at the line scanning results of the components of Example 1 in FIG. 2, the degree of diffusion of Ho and Dy was close. This phenomenon indicates that Ho and Dy preferentially replace Nd on 4f in the main phase, and in the present invention, through the addition of Ho element, it occupies the diffusion path of some of the heavy rare earth elements, and the heavy rare earth element Dy is the main phase. The effect of reducing the diffusion amount from the outer layer to the inside and thus increasing the concentration of Dy in the columnar outer layer was achieved.

Claims (10)

In the double-cornered niodymium iron boron magnetic material including columnar crystal grains, the double-corner layer and an Nd-rich phase adjacent to the columnar crystal grains,
The columnar crystal grains include R ₂ Fe ₁₄ B; wherein R is at least one of La, Ce, Pr, and Nd;
The inner layer of the bicorne layer contains (Nd/Ho) ₂ Fe ₁₄ B and/or (Nd/Gd) ₂ Fe ₁₄ B;
The outer layer of the bicorne layer contains (Nd/Dy) ₂ Fe ₁₄ B and/or (Nd/Tb) ₂ Fe ₁₄ B;
The thickness of the double layer is 0.1 to 6 μm;
Among the Nd-rich phases, (R-RH) ₆ T ₁₃ X phase is included, RH is at least one of Ho, Gd, Dy and Tb, T is Fe and/or Co, and X is Ga, Cu and Al A double horn layer niodymium iron boron magnetic material, characterized in that at least one. The double angle layer niodymium iron boron magnetic material according to claim 1, characterized in that the Nd-rich phase includes further ZrB ₂ and TiB ₂ . The procedure below, i.e.:
S1. Process for producing and obtaining the main alloy sheet, the first auxiliary alloy sheet, and the second auxiliary alloy sheet respectively;
Here, the raw material of the first auxiliary alloy sheet includes LH ₁ , RH ₁ , X ₁ and Fe; wherein LH ₁ is one or more of La, Ce, Pr and Nd, and RH ₁ is Ho and/or Gd And, wherein X ₁ is at least one of Cu, Co, Ga, and Al; in the first supplementary alloy sheet, the mass percentage occupied by LH ₁ is 0 to 80%, and the RH ₁ is the first supplementary alloy sheet The mass percentage occupied in is 5 to 80%, the mass percentage occupied by the total amount of LH ₁ and RH ₁ in the first supplementary alloy sheet is 30% or more, and the X ₁ is the mass percentage occupied by the first supplementary alloy sheet is 1 to 15%; the sum of the mass percentages of each element in the first auxiliary alloy sheet is 100%;
The raw material of the second auxiliary alloy sheet includes RH ₂ , X2 and Fe; the RH ₂ is Dy and/or Tb, and the X ₂ is Zr and/or Ti; in the second auxiliary alloy sheet, the The mass percentage occupied by RH ₂ in the second supplementary alloy sheet is 0 to 80%, excluding 0, and the mass percentage occupied by X ₂ in the second supplementary alloy sheet is 3 to 10%; The sum of the mass percentages of each element in the auxiliary alloy sheet is 100%;
S2. Procedure for obtaining the double layered niodymium iron boron magnetic material by forming and sintering the mixture of the main alloy sheet, the first auxiliary alloy sheet, and the second auxiliary alloy sheet subjected to hydrogen crushing or pulverization
A method for producing a double-cornered niodymium iron boron magnetic body according to claim 1 or 2, characterized in that it comprises a. According to claim 3,
In S1, the mass percentage of LH ₁ in the first auxiliary alloy sheet is 0 to 60%, except for 0, for example 30%;
and/or, in S1, LH ₁ is Pr and/or Nd;
And/or, in S1, when Pr is included in the raw material of the first auxiliary alloy sheet, the mass percentage occupied by Pr is 0 to 60%, for example 7.5%;
And/or, in S1, when Nd is included in the raw material of the first auxiliary alloy sheet, the mass percentage of Nd in the first auxiliary alloy sheet is 0 to 60%, for example 22.5%;
And / or, in S1, the mass percentage of RH ₁ in the first auxiliary alloy sheet is 20 to 50%;
And/or, in S1, the mass percentage of the total amount of LH ₁ and RH ₁ in the first supplementary alloy sheet is 50% or more;
And/or, in S1, wherein X ₁ is Cu and/or Co;
And/or, in S1, the mass percentage of X ₁ in the first auxiliary alloy sheet is 5 to 12%, preferably 5 to 10%;
And/or, in S1, when X ₁ includes Cu, the mass percentage of Cu in the first supplementary alloy sheet is 1 to 6%, for example 5%;
And / or, in S1, when the X ₁ includes Co, the mass percentage of Co in the first supplementary alloy sheet is 1 to 6%, for example 5%;
And/or, in S1, in the first auxiliary alloy sheet, the mass percentage of Fe in the first auxiliary alloy sheet is 50% or less, preferably 39 to 45%, for example 39.5% or 44.7% and;
And/or, in S1, the raw material of the first auxiliary alloy sheet includes advanced B, and the mass percentage of B in the first auxiliary alloy sheet is 0 to 0.6%, and is not 0, such as 0.3%. Method for producing a double angle layer niodymium iron boron magnetic body, characterized in that % or 0.5%. The method of claim 4, wherein the raw material of the first auxiliary alloy is composed of the following components: Ho content 50%; Cu content 5%; Fe content 44.7%; B content 0.3%; It refers to the mass percentage of the component in the raw material of the first auxiliary alloy;
Alternatively, the raw material of the first auxiliary alloy includes the following components: Pr content 7.5%; Nd content 22.5%; Ho content 20%; Cu content 5%; Co content 5%; Fe content 39.5% %; The content of B is 0.5%; The percentage means the mass percentage of the component in the raw material of the first auxiliary alloy. The method of claim 3, wherein in S1, the mass percentage of RH ₂ in the second supplementary alloy sheet is 50 to 80%, for example 58% or 63%;
And/or, in S1, the mass percentage occupied by X ₂ in the second auxiliary alloy sheet is 6 to 10%;
And/or, in S1, when X ₂ includes Zr, the mass percentage of Zr in the second auxiliary alloy sheet is 6 to 10%;
And/or, in S1, the raw material of the second auxiliary alloy sheet includes advanced LH ₂ , the LH2 is one or more of La, Ce, Pr, and Nd, and the LH ₂ occupies in the second auxiliary alloy sheet The mass percentage is 80% or less, excluding 0;
And/or, in S1, the raw material of the second auxiliary alloy sheet includes advanced B, and the mass percentage of B in the second auxiliary alloy sheet is 0 to 0.6%, and 0 is excluded, for example Method for producing a double angle layer niodymium iron boron magnetic body, characterized in that 0.5%. The method of claim 6, wherein the raw material of the second auxiliary alloy is composed of the following components: Dy content 58%; Zr content 6%; Fe content 36%; It means the mass percentage of the component in;
Alternatively, the raw material of the second auxiliary alloy is composed of the following components: Dy content 63%; Zr content 6%; Fe content 30.5%; B content 0.5%; Means the mass percentage of the component in the raw material of;
Alternatively, the raw material of the second auxiliary combination is composed of the following components: Dy content 58%; Zr content 6%; Fe content 35.5%; B content 0.5%; A method for producing a double layered niodymium iron boron magnetic body, characterized in that it means the mass percentage of the components in the raw material of. The method of claim 3, wherein in S1, the melting point of the first auxiliary alloy sheet is lower than the melting point of the second auxiliary alloy sheet;
and/or, in S1, the raw material of the main alloy sheet includes LH ₃ , X ₃ , Y ₃ , Fe and B; the LH ₃ includes Pr and/or Nd, and the X ₃ includes Zr, Ti And at least one of Nb, wherein Y ₃ is at least one of Cu, Al, Ga, and Co, and Y ₃ necessarily includes Cu; in the main alloy sheet, the LH ₃ occupies in the main alloy sheet The mass percentage is 27 to 35%, the mass percentage occupied by X ₃ in the main alloy sheet is 0.05 to 0.8%; the sum of the mass percentages of each element in the main alloy sheet is 100%. Manufacturing method of niodymium iron boron magnetic material. The method of claim 8, wherein the mass percentage of the LH ₃ in the main alloy sheet is 27 to 30%, for example 27.6%, 28% or 29%;
And/or, the mass percentage of X ₃ in the main alloy sheet is 0.1 to 0.6%, preferably 0.2 to 0.3%, for example 0.22%;
and/or, the mass percentage occupied by Y ₃ in the main alloy sheet is 0.75 to 2.5%, for example 1.15% or 2.06%;
and/or, in the main alloy sheet, the mass percentage of Cu occupied in the main alloy sheet is 0.1 to 0.6%, for example 0.21% or 0.25%;
and/or, in the main alloy sheet, when Y ₃ contains Al, the mass percentage of Al in the main alloy sheet is 0.02 to 1.2%, for example 0.4%;
and/or, in the main alloy sheet, when Y ₃ contains Ga, the mass percentage of Ga in the main alloy sheet is 0.25 to 0.4%, for example 0.26%;
and/or, in the main alloy sheet, when Y ₃ contains Co, the mass percentage of Co in the main alloy sheet is 0.5 to 1.2%, for example 1.19%;
and/or, in the main alloy sheet, the mass percentage of B in the main alloy sheet is 0.97 to 1%;
And/or, the raw material of the main alloy sheet further includes RH ₃ , the RH ₃ is Dy and/or Tb, and the mass percentage of the RH ₃ in the main alloy sheet is 0 to 3%, and 0 is excluded;
Preferably, the raw material of the main alloy includes the following components: Nd content 27.6%; Dy content 3%; Ga content 0.26%; Al content 0.4%; Cu content 0.21%; Co content 1.19% ; Ti content 0.2%; Nb content 0.02%; B content 1%; Fe content 66.12%; Percentage means the mass percentage of the component in the raw material of the main alloy;
Alternatively, the raw material of the main alloy includes the following components: Pr content 7%; Nd content 21%; Dy content 3%; Ga content 0.4%; Cu content 0.25%; Co content 0.5%; The content of Zr is 0.2%; The content of B is 0.97%; The content of Fe is 66.68%; Percentage means the mass percentage of the component in the raw material of the main alloy;
Alternatively, the raw material of the main alloy includes the following components: Pr content 7.25%; Nd content 21.75%; Dy content 1%; Ga content 0.4%; Cu content 0.25%; Co content 0.5%; Zr content 0.2%; B content 0.97%; Fe content 67.68%; percentage refers to the mass percentage of the components in the raw material of the main alloy Manufacture of a double layered niodymium iron boron magnetic body, characterized in that method. The method of claim 3, wherein in S1, the first auxiliary alloy sheet is obtained by melting and casting the raw material of the first auxiliary alloy sheet; preferably, the melting and smelting temperature of the raw material of the first auxiliary alloy sheet is 1000 ° C. or more; Casting of the first auxiliary alloy sheet is preferably a strip continuous casting method, an ingot casting method, a centrifugal casting method, or a rapid quenching method;
And / or, in S1, the second auxiliary alloy sheet is obtained by subjecting the raw material of the second auxiliary alloy sheet to melting and smelting and casting; The above; The casting of the second auxiliary alloy sheet is preferably a strip continuous casting method, an ingot casting method, a centrifugal casting method, or a rapid quenching method;
And/or, in S1, the main alloy sheet is obtained by melting and casting the raw material of the main alloy sheet; preferably, the melting and smelting temperature of the raw material of the main alloy sheet is 1400 ° C. or higher; Sheet casting is preferably a strip continuous casting method, an ingot casting method, a centrifugal casting method, or a rapid quenching method;
And/or, in S2, the mass percentage of the amount of the first auxiliary alloy sheet and the second auxiliary alloy sheet in the amount of the raw material of the double layer niodymium iron boron magnetic material is preferably greater than 1% and also 15% Less than, preferably 5%; The raw material of the double layer niodymium iron boron magnetic material is the main alloy sheet, the first auxiliary alloy sheet and the second auxiliary alloy sheet;
And / or, in S2, the mixture of the main alloy sheet and the auxiliary alloy sheet is subjected to hydrogen crushing, pulverization, molding and sintering to obtain the double layer niodymium iron boron magnetic body; or, the main alloy sheet and Each of the auxiliary alloy sheets is subjected to hydrogen crushing, further mixing the main alloy sheet and the coarse powder after hydrogen crushing of the auxiliary alloy sheet, and subjecting the coarse powder after further mixing to pulverization, molding and sintering to obtain the double To obtain each layer niodymium iron boron magnetic material; Alternatively, the main alloy sheet and the auxiliary alloy sheet are subjected to hydrogen crushing and pulverization, respectively, and the main alloy sheet and the auxiliary alloy sheet are mixed with the fine powder after pulverization, and further mixing Forming and sintering the following subdivisions to obtain the double layer niodymium iron boron magnetic body;
And / or, in S2, the dehydrogenation temperature of the hydrogen crushing is 400 ℃ ~ 650 ℃, for example, 500 ~ 620 ℃;
and/or, in S2, the pulverization is pulverization by a jet mill;
And / or, in S2, the pulverization proceeds in an atmosphere with an oxygen content of 50 ppm or less;
and/or, in S2, the particle size of the powder after pulverization is 2 to 7 μm, for example 3.0 to 5.3 μm;
And / or, in S2, the molding is pressed with a green compact in a pressure machine with a magnetic field strength of 0.5T to 3.0T, for example, 1.0 to 2.0T;
And / or, in S2, the temperature of the sintering is 1000 ~ 1150 ℃, for example, 1050 ~ 1085 ℃ method for producing a double layer niodymium iron boron magnetic material, characterized in that.

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