CN113889310A - R-T-B series permanent magnetic material, raw material composition, preparation method and application - Google Patents
R-T-B series permanent magnetic material, raw material composition, preparation method and application Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- Hard Magnetic Materials (AREA)
Abstract
The invention discloses an R-T-B series permanent magnetic material, a raw material composition, a preparation method and application. The R-T-B series permanent magnetic material comprises the following components: r, B, Ti, Cu and Ga; r: 29.0 to 31.5 wt%; b: 0.87-0.91 wt%; the R is a rare earth element; the R comprises a light rare earth element RL, and the RL comprises Nd; the Ti, the Cu, and the Ga satisfy the following relational expressions: (1) Ti/(Cu + Ga) is more than 0 and less than or equal to 0.8; (2) not less than 0.3 (Ti + Cu + Ga) not more than 0.5; wt% refers to the weight percentage in the R-T-B series permanent magnetic material; the balance being Fe and Co and unavoidable impurities. The R-T-B series permanent magnet material has excellent performance: the Br of a non-grain boundary diffusion product is not less than 14.50kGs, Hcj is not less than 15kOe, the grain boundary diffusion product: br is more than or equal to 14.50kGs, and Hcj is more than or equal to 25.5kOe, thereby realizing the synchronous promotion of Br and Hcj.
Description
The invention relates to a division of a patent application with the application date of 2019, 12 and 31, the application number of 201911425263.6 and the name of R-T-B series permanent magnet material, a raw material composition, a preparation method and application.
Technical Field
The invention relates to an R-T-B series permanent magnetic material, a raw material composition, a preparation method and application.
Background
Permanent magnet materials have been developed as key materials for supporting electronic devices, and the development is moving towards high magnetic energy product and high coercivity. R-T-B permanent magnet materials (R is at least one of rare earth elements) are known as magnets having the highest performance among permanent magnets, and are used in various motors such as Voice Coil Motors (VCM) for hard disk drives, motors for electric vehicles (EV, HV, PHV, etc.), and motors for industrial equipment, and household electric appliances.
In the R-T-B sintered magnet, the coercive force Hcj of the magnet is usually improved by adding heavy rare earth such as Dy and Tb or by adopting grain boundary diffusion of the heavy rare earth, but the heavy rare earth is scarce in resources and expensive. In the prior art, the content of B in the magnet is reduced, and Cu/Al/Ga is added to generate R6-T13X (X refers to Cu/Al/Ga) optimizes the grain boundary and promotes Hcj, so that the use amount of heavy rare earth is reduced; but the reduction of the B content results in R2T14The volume fraction of the B main phase decreases, resulting in a decrease in the remanent flux density Br of the magnet.
Therefore, there is a need for an R-T-B permanent magnetic material in which Hcj and Br can be simultaneously increased.
Disclosure of Invention
The invention aims to overcome the defect that Hcj and Br of an R-T-B series permanent magnetic material can not be simultaneously improved in the prior art, and provides an R-T-B series permanent magnetic material, a raw material composition, a preparation method and application.
The invention solves the technical problems through the following technical scheme:
the invention provides an R-T-B series permanent magnetic material which comprises the following components in percentage by weight: r, B, Ti, Cu and Ga;
R：29.0～31.5wt％；
B：0.87-0.91wt％；
the R is a rare earth element, the R comprises a light rare earth element RL, and the RL comprises Nd; the Ti, the Cu, and the Ga satisfy the following relational expressions:
(1)0＜Ti/(Cu+Ga)≤0.8；
(2)0.3≤(Ti+Cu+Ga)≤0.5；
wt% refers to the weight percentage in the R-T-B series permanent magnetic material;
the balance being Fe and Co and unavoidable impurities.
In the invention, the R can also comprise a heavy rare earth element RH.
In the present invention, the Ti/(Cu + Ga) is preferably 0.01 to 0.5 or 0.003 to 0.8, for example, 0.25.
In the present invention, the (Ti + Cu + Ga) is preferably 0.45 to 0.5.
In the present invention, preferably, Ti-rich R is present at the grain boundary of the R-T-B permanent magnetic materialm(Fe+Co)1-m-x-y-z(CuxGayTiz) An enriched phase, wherein: m 25.5-30 at%, x 0-2 at%, y 1.5-2.5 at%, z 5.5-6.5 at%, and at% refers to atomic percentage.
Wherein said m is preferably 25.5-29.6 at%, such as 28.8 at%, 28.9 at%, 29.1 at% or 29.4 at%.
Wherein said x is preferably 0.5-2 at% or 0-1.7 at%, such as 1.5 at% or 1.6 at%.
Wherein y is preferably 1.5-2.3 at%, such as 2.4 at%, 1.6 at% or 1.8 at%.
Wherein z is preferably 5.5-5.9 at%, such as 5.8 at%.
Wherein, R ism(Fe+Co)1-m-x-y-z(CuxGayTiz) The enrichment phase may be R28.8(Fe+Co)61.5Cu1.7Ga2.4Ti5.5、R29.6(Fe+Co)60.8Cu1.5Ga1.6Ti6.5、R28.9(Fe+Co)63.8Ga1.5Ti5.8、R29.1(Fe+Co)63.1Cu0.5Ga1.8Ti5.5Or R29.4(Fe+Co)60.8Cu1.6Ga2.3Ti5.9。
Wherein, the grain boundary of the R-T-B series permanent magnetic material generally refers to the connection position of two or more main phase grains.
In the present invention, the content of R is preferably 29 to 31 wt% or 29.5 to 31.5 wt%, for example 29.7 wt%, 30 wt% or 30.5 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material.
In the present invention, the content of RH is preferably 0 to 1 wt% and not 1 wt%, for example, 0.2 wt% or 0.7 wt%, referring to the weight percentage in the R-T-B based permanent magnetic material.
In the present invention, the content of B is preferably 0.89 to 0.905 wt%, for example 0.9 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material.
In the present invention, the content of Ti is preferably in the range of 0 to 0.2 wt% and not 0, such as 0.001 to 0.2 wt%, further such as 0.005 wt% or 0.1 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material.
In the present invention, the Cu content is preferably in the range of 0 to 0.15 wt%, for example, 0.1 wt% or 0.05 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material.
In the present invention, the content of Ga is preferably in the range of 0.2 to 0.4 wt%, for example, 0.345 wt%, 0.15 wt%, 0.25 wt% or 0.3 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material.
In the invention, the content of Co can be in the range of 0.5-2 wt%, and wt% refers to the weight percentage in the R-T-B series permanent magnet material.
In the invention, the RL can also comprise one or more of La, Ce, Pr, Sm and Eu.
In the invention, the RH may include one or more of Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.
In the present invention, the components and contents of the R-T-B based permanent magnetic material may be conventional in the art. Preferably, the R-T-B series permanent magnetic material comprises the following components in percentage by weight:
r29.0-31.0 wt%; RH 0-1 wt% and not 1 wt%; b0.87-0.91 wt%; 0-0.2 wt% Ti and not 0; cu 0-0.15 wt%; ga 0.2-0.4 wt%; 0.5-2 wt% of Co; the weight percent of the Fe-B permanent magnet material is the weight percentage of the R-T-B permanent magnet material, and the balance is Fe and inevitable impurities.
Preferably, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: r29.5-31.5 wt%; RH 0-1 wt% and not 1 wt%; b0.87-0.91 wt%; 0-0.2 wt% Ti and not 0; cu 0-0.15 wt%; ga 0.2-0.4 wt%; 0.5-2 wt% of Co; the weight percent of the Fe-B permanent magnet material is the weight percentage of the R-T-B permanent magnet material, and the balance is Fe and inevitable impurities.
In a preferred embodiment of the invention, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: 29 wt% of PrNd, 0.87 wt% of B, 0.005 wt% of Ti0.005 wt% of Cu0.15 wt%, 0.345 wt% of Ga0.345 wt% of Co2 wt%, and the balance of Fe and inevitable impurities.
In a preferred embodiment of the invention, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: 30.8 wt% of PrNd, 0.2 wt% of Dy, 0.91 wt% of B, 0.2 wt% of Ti0.2 wt% of Cu0.1 wt%, 0.15 wt% of Gas, and 2 wt% of Co, wherein the wt% of Co is the weight percentage of the R-T-B permanent magnet material, and the balance of Fe and inevitable impurities.
In a preferred embodiment of the invention, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: 29.8 wt% of Nd, 0.1 wt% of Gd, 0.1 wt% of Ho, 0.89 wt% of B, 0.001 wt% of Ti0.001 wt%, 0.05 wt% of Cu0.25 wt% of Ga0.25 wt% of Co2 wt%, wherein the wt% of the permanent magnet material is the weight percentage of the permanent magnet material in the R-T-B system, and the balance of Fe and inevitable impurities.
In a preferred embodiment of the invention, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: 29.5 wt% of PrNd, 0.2 wt% of Tb, 0.905 wt% of B, 0.1 wt% of Ti0.1 wt%, Cu0 wt%, Ga0.2 wt% of Co2 wt%, and the balance of Fe and inevitable impurities.
In a preferred embodiment of the invention, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: 30.5 wt% of PrNd, 0.9 wt% of B, 0.1 wt% of Ti0.1 wt%, Cu0 wt%, Ga0.3 wt% and Co2 wt%, wherein the wt% of the PrNd, the B, the Cu0 wt% and the Co2 wt% are the weight percentage of the R-T-B series permanent magnet material, and the balance of Fe and inevitable impurities.
In a preferred embodiment of the invention, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: 30.8 wt% of PrNd, 0.2 wt% of Dy, 0.5 wt% of Tb, 0.91 wt% of B, 0.2 wt% of Ti0.2 wt%, 0.1 wt% of Cu0.15 wt% of Ga0.15 wt% of Co2 wt%, and the balance of Fe and inevitable impurities.
The invention also provides an R-T-B series permanent magnetic material, which comprises the following components: r, B, Ti, Cu and Ga;
the R is a rare earth element, the R comprises a light rare earth element RL, and the RL comprises Nd; the grain boundary of the R-T-B series permanent magnet material has R rich in Tim(Fe+Co)1-m-x-y-z(CuxGayTiz) An enriched phase, wherein: m 25.5-30 at%, x 0-2 at%, y 1.5-2.5 at%, z 5.5-6.5 at%, and at% refers to atomic percentage.
Wherein, the R can also comprise heavy rare earth element RH.
The invention also provides a raw material composition of the R-T-B series permanent magnetic material, which comprises the following components in percentage by weight: r, B, Ti, Cu and Ga;
R：29.0～31.0wt％；
B：0.87-0.91wt％；
the R is a rare earth element, the R comprises a light rare earth element RL, and the RL comprises Nd; the Ti, the Cu, and the Ga satisfy the following relational expressions:
(1)0＜Ti/(Cu+Ga)≤0.8；
(2)0.3≤(Ti+Cu+Ga)≤0.5；
the wt% is the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
the balance being Fe and Co and unavoidable impurities.
In the present invention, preferably, the R may further include a heavy rare earth element RH.
In the present invention, the Ti/(Cu + Ga) is preferably 0.01 to 0.5 or 0.003 to 0.8, for example, 0.25.
In the present invention, the (Ti + Cu + Ga) is preferably 0.45 to 0.5.
In the present invention, the content of R is preferably 29 to 30.5 wt%, for example 29.7 wt%, 30 wt% or 30.5 wt%, and wt% means the weight percentage of the raw material composition of the R-T-B based permanent magnetic material.
In the present invention, the content of RH is preferably 0 to 1 wt% and not 1 wt%, for example, 0.2 wt% or 0.7 wt%, and wt% means a weight percentage of the raw material composition of the R-T-B based permanent magnetic material.
In the present invention, the content of B is preferably 0.89 to 0.905 wt%, for example 0.9 wt%, where wt% refers to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material.
In the present invention, the content of Ti is preferably in the range of 0 to 0.2 wt% and other than 0, for example, 0.001 to 0.2 wt%, further for example, 0.005 wt% or 0.1 wt%, wt% referring to the weight percentage of the raw material composition of the R-T-B based permanent magnetic material.
In the present invention, the Cu content is preferably in the range of 0 to 0.15 wt%, for example, 0.1 wt% or 0.05 wt%, and wt% means the weight percentage of the raw material composition of the R-T-B based permanent magnetic material.
In the present invention, the content of Ga is preferably in the range of 0.2 to 0.4 wt%, for example, 0.345 wt%, 0.15 wt%, 0.25 wt% or 0.3 wt%, and wt% means the weight percentage of the raw material composition of the R-T-B based permanent magnetic material.
In the invention, the content range of Co can be 0.5-2 wt%, and wt% refers to the weight percentage of the raw material composition of the R-T-B series permanent magnet material.
The invention also provides a preparation method of the R-T-B series permanent magnetic material, which comprises the following steps: the melting liquid of the raw material composition of the R-T-B series permanent magnet material is cast, crushed, formed and sintered.
In the present invention, the melt of the raw material composition of the R-T-B series permanent magnetic material can be prepared by a conventional method in the art, for example: smelting in a high-frequency vacuum induction smelting furnace. The vacuum degree of the smelting furnace can be 5 multiplied by 10-2Pa. The temperature of the smelting can be below 1500 ℃.
In the present invention, the casting process may be a casting process conventional in the art, for example: in an Ar gas atmosphere (e.g. 5.5X 10)4Pa of Ar gas atmosphere) at 10 deg.f2DEG C/sec-104Cooling at a rate of DEG C/sec.
In the present invention, the crushing process may be a crushing process conventional in the art, for example, by hydrogen absorption, dehydrogenation, and cooling.
Wherein the hydrogen absorption can be carried out under the condition that the hydrogen pressure is 0.15 MPa.
Wherein the dehydrogenation is carried out under a condition of raising the temperature while evacuating.
In the present invention, the pulverization process may be a pulverization process conventional in the art, such as jet milling.
Wherein, preferably, the pulverization process is carried out in an atmosphere having an oxidizing gas content of 100ppm or less.
The oxidizing gas refers to oxygen or moisture content.
Wherein, the pressure of the crushing chamber for crushing by the jet mill can be 0.38 MPa.
Wherein, the jet mill pulverization time can be 3 hours.
Wherein after said pulverization, a lubricant, such as zinc stearate, may be added as is conventional in the art. The lubricant may be added in an amount of 0.10 to 0.15%, for example 0.12% by weight of the mixed powder.
In the present invention, the forming process may be a forming process conventional in the art, such as magnetic field forming or hot press hot deformation.
In the present invention, the sintering process may be a sintering process conventional in the art, for example, under vacuum conditions (e.g., at 5 × 10)-3Pa, vacuum), preheating, sintering and cooling.
Wherein the preheating temperature can be 300-600 ℃. The preheating time can be 1-2 h. Preferably, the preheating is for 1h each at a temperature of 300 ℃ and 600 ℃.
The sintering temperature may be any sintering temperature conventional in the art, such as 900 ℃ to 1100 ℃, for example 1040 ℃.
Wherein the sintering time may be a sintering time conventional in the art, for example, 2 h.
Wherein Ar gas can be introduced before cooling to ensure that the gas pressure reaches 0.1 MPa.
Preferably, the sintering is further followed by grain boundary diffusion treatment.
The heavy rare earth elements in the grain boundary diffusion treatment include Dy and/or Tb.
The grain boundary diffusion treatment may be performed according to a process conventional in the art, such as Tb sputter diffusion.
The temperature of the grain boundary diffusion treatment can be 800-900 ℃, such as 850 ℃.
The time of the grain boundary diffusion treatment may be 12 hours.
After the grain boundary diffusion treatment, heat treatment can also be carried out. The temperature of the heat treatment may be 470-510 deg.C, for example 500 deg.C. The time of the heat treatment may be 3 hours.
The invention also provides the R-T-B series permanent magnetic material prepared by the method.
The invention also provides application of the R-T-B series permanent magnetic material as an electronic component.
The electronic components may be conventional in the art, such as those in motors.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
the R-T-B series permanent magnet material has excellent performance: the Br of a non-grain boundary diffusion product is not less than 14.50kGs, Hcj is not less than 15kOe, the grain boundary diffusion product: br is more than or equal to 14.50kGs, and Hcj is more than or equal to 25.5kOe, thereby realizing the synchronous promotion of Br and Hcj.
Drawings
FIG. 1 is an EPMA distribution diagram of a sintered magnet Ti of example 3.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
TABLE 1 formulation (wt%) of raw material composition of R-T-B series permanent magnetic material
The R-T-B sintered magnets of examples 1 to 5 and comparative examples 1 to 6 were prepared as follows:
(1) and (3) smelting: according to the formulation shown in Table 1, the prepared raw materials were put into a crucible made of alumina, and placed in a high-frequency vacuum induction melting furnace at 5X 10-2Vacuum melting is carried out at a temperature of 1500 ℃ or lower in a vacuum of Pa.
(2) The casting process comprises the following steps: ar gas is introduced into a melting furnace after vacuum melting to make the gas pressure reach 5.5 ten thousand Pa, and then casting is carried out at 10 degrees2DEG C/sec-104The cooling rate of DEG C/second obtains the quenched alloy.
(3) Hydrogen crushing and crushing: and (2) vacuumizing the hydrogen breaking furnace in which the quenching alloy is placed at room temperature, introducing hydrogen with the purity of 99.9% into the hydrogen breaking furnace, maintaining the hydrogen pressure at 0.15MPa, fully absorbing hydrogen, vacuumizing while heating, fully dehydrogenating, cooling, and taking out the powder after hydrogen breaking and crushing.
(4) A micro-grinding process: the powder after hydrogen crushing was pulverized by jet milling for 3 hours under a nitrogen atmosphere having an oxidizing gas content of 100ppm or less and a pressure in the pulverization chamber of 0.38MPa to obtain a fine powder. The oxidizing gas refers to oxygen or moisture.
(5) Adding zinc stearate into the powder crushed by the jet mill, wherein the adding amount of the zinc stearate is 0.12 percent of the weight of the mixed powder, and then fully mixing the zinc stearate and the mixed powder by using a V-shaped mixer.
(6) Magnetic field forming process: using a magnetic field forming machine of a perpendicular orientation type, in an orientation magnetic field of 1.6T, at 0.35ton/cm2The powder added with zinc stearate was once formed into a cube with a side length of 25mm under the molding pressure of (1), and demagnetized in a magnetic field of 0.2T after the primary molding. The molded article after the primary molding was sealed so as not to contact air, and then subjected to secondary molding (isostatic pressing) at 1.3ton/cm2Secondary forming is performed under pressure of (1).
(7) And (3) sintering: the molded bodies were transferred to a sintering furnace and sintered at 5X 10-3Pa at 300 deg.C and 600 deg.C for 1 hr, sintering at 1040 deg.C for 2 hr, introducing Ar gas to make the pressure reach 0.1MPa, and cooling to room temperature.
(8) And (3) heat treatment process: and (3) carrying out heat treatment on the sintered body in high-purity Ar gas at the heat treatment temperature of 500 ℃ for 3 hours, cooling to room temperature, and taking out to obtain the R-T-B permanent magnet material.
The preparation method of the R-T-B sintered magnet of example 6 is as follows:
the R-T-B system sintered magnet of example 6 was prepared according to the formulation shown in table 1 and the preparation process of example 1, except that:
after the step (7) and before the step (8), a grain boundary diffusion treatment process is added, the sintered body is processed into a magnet with the diameter of 20mm and the thickness of 5mm, the thickness direction is the magnetic field orientation direction, after the surface is cleaned, the whole surface of the magnet is sprayed and coated with raw materials prepared by Tb fluoride respectively, the coated magnet is dried, metal with Tb attached is sputtered on the surface of the magnet in a high-purity Ar gas atmosphere, and the diffusion heat treatment is carried out for 24 hours at the temperature of 850 ℃. And cooling to room temperature.
Effects of the embodiment
The R-T-B system sintered magnets obtained in examples 1 to 6 and comparative examples 1 to 6 were each used to measure the magnetic properties and composition thereof, and FE-EPMA was used to observe the phase composition of the magnets.
(1) R-T-B series permanent magnetic material and each component thereof are measured by using a high-frequency inductively coupled plasma emission spectrometer (ICP-OES), wherein Rm(Fe+Co)1-m-x-y-z(CuxGayTiz) Specific phase composition of the enriched phase was obtained according to the FE-EPMA test (FIG. 1 is an EPMA distribution diagram of Ti in the sintered magnet of example 3), and the results of component detection are shown in tables 2 and 3 below.
TABLE 2 composition and content (wt%) of R-T-B series permanent magnetic material
Note: "/" indicates that the element is not added.
(2) Evaluation of magnetic Properties: the sintered magnets in examples 1 to 6 and comparative examples 1 to 6 were subjected to magnetic property measurement using a NIM-10000H type BH bulk rare earth permanent magnet nondestructive measurement system of China's Council. The following Table 3 shows the results of magnetic property measurements.
TABLE 3 Properties of R-T-B series permanent magnet materials
As can be seen from Table 3:
1) the R-T-B series permanent magnetic material of the non-boundary diffusion product has excellent performance: br is more than or equal to 14.50kGs, Hcj is more than or equal to 15kOe, and the synchronous promotion of Br and Hcj is realized; and the maximum magnetic energy product is more than or equal to 50.9MGOe (examples 1-5);
grain boundary diffusion product: br is more than or equal to 14.50kGs, and Hcj is more than or equal to 25.5 kOe.
2) Based on the formula of the invention, the range values of Ti/(Cu + Ga) and (Ti + Cu + Ga) are adjusted, even if R and B meet the proportion range of the application, the magnetic performance of the R-T-B series permanent magnetic material is reduced (comparative examples 1-3);
3) based on the formula of the invention, the range values of Ti/(Cu + Ga) and (Ti + Cu + Ga) are ensured to be in the range defined by the application, and when R and B do not satisfy the proportion range of the application, the magnetic properties of the R-T-B series permanent magnetic material and the R-T-B series permanent magnetic material are reduced (comparative examples 4-5);
4) based on the formulation of the present invention, even if Ti/(Cu + Ga), (Ti + Cu + Ga) and R and B values are adjusted conventionally, the magnetic properties of the R-T-B system permanent magnetic material and the magnetic properties are degraded (comparative example 6).
Claims (10)
1. An R-T-B series permanent magnetic material is characterized by comprising the following components in percentage by weight: r, B, Ti, Cu and Ga;
R：29.0～31.5wt％；
B：0.87-0.91wt％；
the R is a rare earth element; the R comprises a light rare earth element RL, and the RL comprises Nd;
the Ti, the Cu, and the Ga satisfy the following relational expressions:
(1)0＜Ti/(Cu+Ga)≤0.8；
(2)0.3≤(Ti+Cu+Ga)≤0.5；
wt% refers to the weight percentage in the R-T-B series permanent magnetic material;
the balance of Fe and Co and inevitable impurities;
the R can also comprise heavy rare earth element RH.
2. The R-T-B based permanent magnetic material according to claim 1, wherein Ti/(Cu + Ga) is 0.01-0.5 or 0.003-0.8, such as 0.25;
and/or, the (Ti + Cu + Ga) is 0.45-0.5;
and/or Ti-rich R exists at the grain boundary of the R-T-B series permanent magnetic materialm(Fe+Co)1-m-x-y-z(CuxGayTiz) An enriched phase, wherein: m 25.5-30 at%, x 0-2 at%, y 1.5-2.5 at%, z 5.5-6.5 at%, at% being atomic percent; said m is preferably 25.5-29.6 at%, such as 28.8 at%, 28.9 at%, 29.1 at%, or 29.4 at%; said x is preferably 0.5-2 at% or 0-1.7 at%, for example 1.5 at% or 1.6 at%; said y is preferably 1.5-2.3 at%, such as 2.4 at%, 1.6 at% or 1.8 at%; said z is preferably 5.5-5.9 at%, e.g. 5.8 at%.
3. The R-T-B based permanent magnetic material according to claim 1 or 2, wherein the R content is 29-31 wt% or 29.5-31.5 wt%, such as 29.7 wt%, 30 wt% or 30.5 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material;
and/or the RH is present in an amount of 0-1 wt% and not 1 wt%, such as 0.2 wt% or 0.7 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material;
and/or the content of B is 0.89-0.905 wt%, such as 0.9 wt%, wherein wt% refers to the weight percentage in the R-T-B series permanent magnetic material;
and/or the said Ti content ranges from 0 to 0.2 wt% and is not 0, such as 0.001 to 0.2 wt%, such as 0.005 wt% or 0.1 wt%, wt% referring to the weight percentage in the said R-T-B series permanent magnetic material;
and/or the Cu content is in the range of 0-0.15 wt%, such as 0.1 wt% or 0.05 wt%, wt% referring to the weight percentage in the R-T-B series permanent magnetic material;
and/or the Ga content ranges from 0.2 to 0.4 wt%, such as 0.345 wt%, 0.15 wt%, 0.25 wt% or 0.3 wt%, wt% referring to the weight percentage in the R-T-B based permanent magnetic material;
and/or the content of Co is in the range of 0.5-2 wt%, wherein wt% refers to the weight percentage in the R-T-B series permanent magnet material.
4. The R-T-B series permanent magnetic material as claimed in any one of claims 1 to 3, wherein the R-T-B series permanent magnetic material comprises the following components in percentage by weight:
r29.0-31.0 wt%; RH 0-1 wt% and not 1 wt%; b0.87-0.91 wt%; 0-0.2 wt% Ti and not 0; cu 0-0.15 wt%; ga 0.2-0.4 wt%; 0.5-2 wt% of Co; the weight percent of the Fe-B permanent magnetic material is the weight percentage of the R-T-B permanent magnetic material, and the balance is Fe and inevitable impurities;
or, the R-T-B series permanent magnetic material comprises the following components in percentage by weight: r29.5-31.5 wt%; RH 0-1 wt% and not 1 wt%; b0.87-0.91 wt%; 0-0.2 wt% Ti and not 0; cu 0-0.15 wt%; ga 0.2-0.4 wt%; 0.5-2 wt% of Co; the weight percent of the Fe-B permanent magnet material is the weight percentage of the R-T-B permanent magnet material, and the balance is Fe and inevitable impurities.
5. An R-T-B series permanent magnetic material is characterized by comprising the following components: r, B, Ti, Cu and Ga;
the R is a rare earth element, the R comprises a light rare earth element RL, and the RL comprises Nd;
the grain boundary of the R-T-B series permanent magnet material has R rich in Tim(Fe+Co)1-m-x-y-z(CuxGayTiz) An enriched phase, wherein: m 25.5-30 at%, x 0-2 at%, y 1.5-2.5 at%, z 5.5-6.5 at%, and at% refers to atomic percentage;
the R can also comprise heavy rare earth element RH.
6. A raw material composition of the R-T-B series permanent magnetic material according to any one of claims 1 to 5, which comprises the following components in percentage by weight: r, B, Ti, Cu and Ga;
R：29.0～31.0wt％；
B：0.87-0.91wt％；
the R is a rare earth element, the R comprises a light rare earth element RL, and the RL comprises Nd; the Ti, the Cu, and the Ga satisfy the following relational expressions:
(1)0＜Ti/(Cu+Ga)≤0.8；
(2)0.3≤(Ti+Cu+Ga)≤0.5；
the R can also comprise a heavy rare earth element RH; the wt% is the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
the balance being Fe and Co and unavoidable impurities.
7. The raw material composition of R-T-B-based permanent magnetic material according to claim 6, wherein Ti/(Cu + Ga) is 0.01 to 0.5 or 0.003 to 0.8, such as 0.25;
and/or, the (Ti + Cu + Ga) is 0.45-0.5;
and/or the content of R is 29-30.5 wt%, such as 29.7 wt%, 30 wt% or 30.5 wt%, wherein wt% refers to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
and/or the RH is 0-1 wt% and not 1 wt%, such as 0.2 wt% or 0.7 wt%, wt% referring to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
and/or, the content of B is 0.89-0.905 wt%, such as 0.9 wt%, wherein wt% refers to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
and/or the Ti content ranges from 0 to 0.2 wt% and is not 0, such as 0.001 to 0.2 wt%, such as 0.005 wt% or 0.1 wt%, wt% referring to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
and/or the content of Cu is in the range of 0-0.15 wt%, such as 0.1 wt% or 0.05 wt%, wherein wt% refers to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
and/or the content of Ga is in the range of 0.2-0.4 wt%, such as 0.345 wt%, 0.15 wt%, 0.25 wt% or 0.3 wt%, wt% referring to the weight percentage of the raw material composition of the R-T-B series permanent magnetic material;
and/or the content range of Co is 0.5-2 wt%, and wt% refers to the weight percentage of the raw material composition of the R-T-B series permanent magnet material.
8. A preparation method of an R-T-B series permanent magnetic material is characterized by comprising the following steps: casting, crushing, pulverizing, molding and sintering a melt of the raw material composition of the R-T-B-based permanent magnetic material according to claim 6 or 7;
preferably, the sintering is further followed by grain boundary diffusion treatment;
preferably, after the sintering or after the grain boundary diffusion treatment, a heat treatment is further performed.
9. The R-T-B series permanent magnetic material prepared by the preparation method according to claim 8.
10. Use of the R-T-B series permanent magnetic material according to any one of claims 1 to 5 and 9 as an electronic component.
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| WO2012102497A2 (en) * | 2011-01-25 | 2012-08-02 | Industry-University Cooperation Foundation, Hanyang University | R-fe-b sintered magnet with enhanced mechanical properties and method for producing the same |
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