CN111172445A - High-entropy alloy with double-layer close-packed hexagonal structure - Google Patents
High-entropy alloy with double-layer close-packed hexagonal structure Download PDFInfo
- Publication number
- CN111172445A CN111172445A CN202010018097.4A CN202010018097A CN111172445A CN 111172445 A CN111172445 A CN 111172445A CN 202010018097 A CN202010018097 A CN 202010018097A CN 111172445 A CN111172445 A CN 111172445A
- Authority
- CN
- China
- Prior art keywords
- alloy
- entropy alloy
- rare earth
- double
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The invention discloses a high-entropy alloy with a double-layer close-packed hexagonal structure, which belongs to the technical field of rare earth alloy materials and comprises the following components of LaxCexPrxNdxWherein x is atomic number percent x-25, or LaxCexPrxNdxSmxWherein x is the atomic number percentage x is 20, and the alloy is smelted by a high vacuum arc smelting furnace under the protection of high-purity argon; the high-entropy alloy is prepared from light rare earth simple substances of lanthanum, cerium, praseodymium, neodymium and samarium (La, Ce, Pr, Nd and Sm), an X-ray diffraction spectrum of the high-entropy alloy is obtained through an X-ray diffractometer, and the crystal structure of the prepared light rare earth high-entropy alloy is determined to be a double-layer close-packed hexagonal structure. The in-situ high-pressure synchrotron radiation X-ray technology is utilized to determine that the high-pressure phase structure has two high-pressure phase structures of face-centered cubic (fcc) and distorted face-centered cubic (dfcc) under high pressure.
Description
Technical Field
The invention relates to the technical field of rare earth alloy materials, in particular to a double-layer close-packed hexagonal high-entropy alloy completely composed of light rare earth.
Background
Rare earth elements have similar crystal structures, similar atomic radii and electronegativities, and can form infinite solid solution alloys with each other. Therefore, the rare earth elements are alloyed according to equal atomic percentage, so that the rare earth high-entropy alloy can be obtained, has excellent magnetic performance, is a good magnetic refrigeration material, and has attracted wide attention of material science workers. Seventeen rare earth elements are generally divided into two groups according to the atomic electron shell structure and physicochemical properties of the rare earth elements, and the characteristics that the different properties can be generated by the coexistence situation and different ionic radii of the rare earth elements in minerals: light rare earth: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium; heavy rare earth: gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium. At present, the research on rare earth high-entropy alloys mainly comprises heavy rare earth high-entropy alloys composed of heavy rare earth (Y, Gd, Tb, Dy, Ho, Er, Tm and Lu) elements, such as YGdTbDyLu, GdTbDyTmLu, DyGdHoTbY, GdDyErHoTb, DyGdHoTbY and the like, wherein the heavy rare earth high-entropy alloys have a close-packed hexagonal crystal structure. The crystal structure of the heavy rare earth high-entropy alloy is not changed by adding a small amount of light rare earth elements, and GdHoLaTbY, LaGdHoYCe and the like still keep a close-packed hexagonal structure. The light rare earth elements La, Pr, Nd and Sm all have double-layer close-packed hexagonal structures at normal temperature and normal pressure, and Ce has two structures of face-centered cubic (fcc) and double-layer close-packed hexagonal (dhcp).
Under pressure, rare earth simple substance has rich phase transition, and due to the characteristic of conduction band d electrons, trivalent rare earth elements show similar crystal structure change process from La to Lu (except Eu and Yb) along with the increase of pressure: hcp → Sm-type → dhcp → fcc, and its phase transition pressure increases with increasing atomic number. As the pressure increases, a distorted fcc structure will result. With further increase of pressure, part of the rare earth elements will transform into a structure of low symmetry with volume collapse. The heavy rare earth high-entropy alloy ygdddyhotb has a similar phase transition process at high pressure, however, high-entropy alloys formed entirely of light rare earth elements and phase structures thereof at high pressure are rarely reported.
Disclosure of Invention
The invention aims to provide a high-entropy alloy with a double-layer close-packed hexagonal structure with pressure-induced polymorphic transformation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a high-entropy alloy with hexagonal close-packed structure is prepared from LaxCexPrxNdxWherein x is atomic number percentage x-25.
The technical scheme of the invention is further improved as follows: laxCexPrxNdxThe alloy has both face centered cubic and twisted face centered cubic structures under high pressure.
The technical scheme of the invention is further improved as follows: the preparation method comprises the following steps:
(1) weighing La with the purity of 99.5-99.9 wt% according to equal atomic percentage: 25%, Ce: 25%, Pr: 25%, Nd: 25% of the raw material;
(2) and uniformly mixing the raw material components, putting the mixture into a high-vacuum arc melting furnace for melting, melting for 4-5 times under the protective atmosphere of high-purity argon, and cooling in a water-cooled copper mold to obtain the alloy button ingot.
The technical scheme of the invention is further improved as follows: the detection method comprises the following steps:
step a, embedding the alloy button ingot into a sample with the size of phi 5mm multiplied by 5mm by using a metallographic sample embedding machine, grinding the surface of the sample by using metallographic abrasive paper of 400#, 800#, 1200# and 2000# in sequence, and polishing the sample;
b, measuring the X-ray diffraction spectrum of the light rare earth high-entropy alloy by using an X-ray diffractometer, wherein the scanning angle range is 20-100 ℃, and the scanning speed is 4 DEG/min;
and c, grinding the alloy ingot into a sheet with the thickness of 30 microns, cutting the sheet into small pieces by using a scalpel, selecting the small pieces with the size of 50-80 microns under a microscope, loading the small pieces into a T301 seal cushion sample cavity with the diameter of phi 100 microns, providing high pressure for a top anvil by using silicon oil as a pressure transmission medium through diamond, and obtaining the structure of the light rare earth high-entropy alloy under the high pressure by adopting in-situ high-pressure synchrotron radiation X-rays.
A high-entropy alloy with hexagonal close-packed structure is prepared from LaxCexPrxNdxSmxWherein x is atomic number percentage x-20.
The technical scheme of the invention is further improved as follows: la20Ce20Pr20Nd20Sm20The alloy has face centered cubic and twisted surfaces under high pressureTwo structures of a core and a cube.
The technical scheme of the invention is further improved as follows: the preparation method comprises the following steps:
(1) weighing La with the purity of 99.5-99.9 wt% according to equal atomic percentage: 20%, Ce: 20%, Pr: 20%, Nd: 20%, Sm: 20 percent of the raw material is used as the raw material;
(2) and uniformly mixing the raw material components, putting the mixture into a high-vacuum arc melting furnace for melting, melting for 4-5 times under the protective atmosphere of high-purity argon, and cooling in a water-cooled copper mold to obtain the alloy button ingot.
The technical scheme of the invention is further improved as follows: the detection method comprises the following steps:
step A, embedding the alloy button ingot into a sample with the size of phi 5mm multiplied by 5mm by using a metallographic sample embedding machine, grinding the surface of the sample by using metallographic abrasive paper of No. 400, No. 800, No. 1200 and No. 2000 in sequence, and polishing the sample;
step B, measuring the X-ray diffraction spectrum of the light rare earth high-entropy alloy by using an X-ray diffractometer, wherein the scanning angle range is 20-100 ℃, and the scanning speed is 4 DEG/min;
and step C, grinding the alloy ingot into a sheet with the thickness of 30 microns, cutting the sheet into small pieces by using a scalpel, selecting the small pieces with the size of 50-80 microns under a microscope, loading the small pieces into a T301 seal cushion sample cavity with the diameter of phi 100 microns, providing high pressure to a top anvil by using silicon oil as a pressure transmission medium, and obtaining the structure of the light rare earth high-entropy alloy under the high pressure by using in-situ high-pressure synchrotron radiation X-rays.
Due to the adoption of the technical scheme, the invention has the technical progress that:
la in the present inventionxCexPrxNdxRare earth high entropy alloys wherein x is 25 atomic percent x, or LaxCexPrxNdxSmxWherein x is the atomic number percentage x of 20 and is completely composed of light rare earth elements, breaks through the convention that the prior rare earth high-entropy alloy is mainly composed of heavy rare earth elements, provides a new idea for the development of the rare earth high-entropy alloy, and promotes the application of the rare earth high-entropy alloy in the industrial field.
The light rare earth high-entropy alloy has a double-layer close-packed hexagonal (dhcp) structure at normal temperature and normal pressure, and has two structures of face-centered cubic (fcc) and distorted face-centered cubic (dfcc) at high pressure.
Drawings
FIG. 1 is alloy La25Ce25Pr25Nd25X-ray diffraction pattern of the cast ingot under normal temperature and normal pressure;
FIG. 2 is alloy La20Ce20Pr20Nd20Sm20X-ray diffraction pattern of the cast ingot under normal temperature and normal pressure;
FIG. 3 is alloy La25Ce25Pr25Nd25X-ray diffraction patterns at high pressure;
FIG. 4 is alloy La20Ce20Pr20Nd20Sm20X-ray diffraction pattern at high pressure.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
example one (see FIGS. 1 and 3)
A high-entropy alloy with hexagonal close-packed structure is prepared from LaxCexPrxNdxWherein x is atomic number percentage x-25. LaxCexPrxNdxThe alloy has both face centered cubic (fcc) and distorted face centered cubic (dfcc) structures at high pressures.
High-entropy alloy La with double-layer close-packed hexagonal structure25Ce25Pr25Nd25The preparation method comprises the following steps:
(1) weighing La: 25%, Ce: 25%, Pr: 25%, Nd: 25 percent of the rare earth metal is used as a raw material, and the purity of the light rare earth metal is within the range of 99.5 to 99.9 weight percent;
(2) and uniformly mixing the raw material components, putting the mixture into a high-vacuum arc melting furnace for melting, melting under the protective atmosphere of high-purity argon, repeatedly turning the alloy ingot for 4-5 times in the melting process to improve the uniformity of the alloy components, and cooling in a water-cooling copper mold to obtain the alloy button ingot.
High-entropy alloy with double-layer close-packed hexagonal structureLa25Ce25Pr25Nd25The detection method comprises the following steps:
step a, embedding the alloy button ingot into a sample with the size of phi 5mm multiplied by 5mm by using a metallographic sample embedding machine, grinding the surface of the sample by using metallographic abrasive paper of 400#, 800#, 1200# and 2000# in sequence, and polishing the sample;
b, measuring the X-ray diffraction spectrum of the light rare earth high-entropy alloy by using an X-ray diffractometer, wherein the scanning angle range is 20-100 ℃, and the scanning speed is 4 DEG/min;
step c, grinding the alloy ingot into a sheet with the thickness of 30 microns, cutting the sheet into small pieces by using a scalpel, selecting the small pieces with the size of 50-80 microns under a microscope, loading the small pieces into a T301 seal cushion phi 100 micron sample cavity, placing the seal cushion on a diamond anvil, and providing high pressure for the diamond anvil by using silicon oil as a pressure transmission medium; in a Beijing high-pressure synchrotron radiation device 4W2 high-pressure station of Chinese academy of sciences, the structure of the light rare earth high-entropy alloy under high pressure is obtained by adopting in-situ high-pressure synchrotron radiation X-rays.
EXAMPLE two (see FIGS. 2 and 4)
A high-entropy alloy with hexagonal close-packed structure is prepared from LaxCexPrxNdxSmxWherein x is atomic number percentage x-20. High-entropy alloy La with double-layer close-packed hexagonal structure20Ce20Pr20Nd20Sm20Both face centered cubic (fcc) and distorted face centered cubic (dfcc) structures at high pressures.
High-entropy alloy La with double-layer close-packed hexagonal structure20Ce20Pr20Nd20Sm20The preparation method comprises the following steps:
(1) weighing La with the purity of 99.5-99.9 wt% according to equal atomic percentage: 20%, Ce: 20%, Pr: 20%, Nd: 20%, Sm: 20 percent of the raw material is used as the raw material;
(2) and uniformly mixing the raw material components, putting the mixture into a high-vacuum arc melting furnace for melting, melting for 4-5 times under the protective atmosphere of high-purity argon, and cooling in a water-cooled copper mold to obtain the alloy button ingot.
High-entropy alloy La with double-layer close-packed hexagonal structure20Ce20Pr20Nd20Sm20The detection method comprises the following steps:
step A, embedding the alloy button ingot into a sample with the size of phi 5mm multiplied by 5mm by using a metallographic sample embedding machine, grinding the surface of the sample by using metallographic abrasive paper of No. 400, No. 800, No. 1200 and No. 2000 in sequence, and polishing the sample;
step B, measuring the X-ray diffraction spectrum of the light rare earth high-entropy alloy by using an X-ray diffractometer, wherein the scanning angle range is 20-100 ℃, and the scanning speed is 4 DEG/min;
and step C, grinding the alloy ingot into a sheet with the thickness of 30 microns, cutting the sheet into small pieces by using a scalpel, selecting the small pieces with the size of 50-80 microns under a microscope, loading the small pieces into a T301 seal cushion sample cavity with the diameter of phi 100 microns, providing high pressure to a top anvil by using silicon oil as a pressure transmission medium, and obtaining the structure of the light rare earth high-entropy alloy under the high pressure by using in-situ high-pressure synchrotron radiation X-rays.
The invention adopts a high vacuum arc melting furnace to prepare the La component25Ce25Pr25Nd25And La20Ce20Pr20Nd20Sm20The light rare earth high-entropy alloy is measured by an X-ray diffractometer, and the crystal structure of the prepared light rare earth high-entropy alloy is determined to be a double-layer close-packed hexagonal (dhcp) structure by diffraction spectrum calibration.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other embodiments obtained by changing, combining and simplifying the basic principle of the present invention belong to the protection scope of the present application.
Claims (8)
1. A high-entropy alloy with a double-layer close-packed hexagonal structure is characterized in that: the component is LaxCexPrxNdxWherein x is atomic number percentage x-25.
2. A high entropy alloy of double layer hexagonal close packed structure according to claim 1, characterized in that: laxCexPrxNdxThe alloy has both face centered cubic and twisted face centered cubic structures under high pressure.
3. A high entropy alloy of double layer hexagonal close packed structure according to claim 1, characterized by the following preparation method:
(1) weighing La with the purity of 99.5-99.9 wt% according to equal atomic percentage: 25%, Ce: 25%, Pr: 25%, Nd: 25% of the raw material;
(2) and uniformly mixing the raw material components, putting the mixture into a high-vacuum arc melting furnace for melting, melting for 4-5 times under the protective atmosphere of high-purity argon, and cooling in a water-cooled copper mold to obtain the alloy button ingot.
4. A high-entropy alloy with a double-layer hexagonal close-packed structure according to claim 3, wherein the detection method is as follows:
step a, embedding the alloy button ingot into a sample with the size of phi 5mm multiplied by 5mm by using a metallographic sample embedding machine, grinding the surface of the sample by using metallographic abrasive paper of 400#, 800#, 1200# and 2000# in sequence, and polishing the sample;
b, measuring the X-ray diffraction spectrum of the light rare earth high-entropy alloy by using an X-ray diffractometer, wherein the scanning angle range is 20-100 ℃, and the scanning speed is 4 DEG/min;
and c, grinding the alloy ingot into a sheet with the thickness of 30 microns, cutting the sheet into small pieces by using a scalpel, selecting the small pieces with the size of 50-80 microns under a microscope, loading the small pieces into a T301 seal cushion sample cavity with the diameter of phi 100 microns, providing high pressure for a top anvil by using silicon oil as a pressure transmission medium through diamond, and obtaining the structure of the light rare earth high-entropy alloy under the high pressure by adopting in-situ high-pressure synchrotron radiation X-rays.
5. A high-entropy alloy with a double-layer close-packed hexagonal structure is characterized in that: the component is LaxCexPrxNdxSmxWherein x is atomic number percentage x-20.
6. The high-entropy alloy of a double-layer close-packed hexagonal structure according to claim 5,the method is characterized in that: la20Ce20Pr20Nd20Sm20The alloy has both face centered cubic and twisted face centered cubic structures under high pressure.
7. A high entropy alloy of double layer hexagonal close packed structure according to claim 5, characterized in that: the preparation method comprises the following steps:
(1) weighing La with the purity of 99.5-99.9 wt% according to equal atomic percentage: 20%, Ce: 20%, Pr: 20%, Nd: 20%, Sm: 20 percent of the raw material is used as the raw material;
(2) and uniformly mixing the raw material components, putting the mixture into a high-vacuum arc melting furnace for melting, melting for 4-5 times under the protective atmosphere of high-purity argon, and cooling in a water-cooled copper mold to obtain the alloy button ingot.
8. A high-entropy alloy with a double-layer hexagonal close-packed structure according to claim 7, wherein the detection method is as follows:
step A, embedding the alloy button ingot into a sample with the size of phi 5mm multiplied by 5mm by using a metallographic sample embedding machine, grinding the surface of the sample by using metallographic abrasive paper of No. 400, No. 800, No. 1200 and No. 2000 in sequence, and polishing the sample;
step B, measuring the X-ray diffraction spectrum of the light rare earth high-entropy alloy by using an X-ray diffractometer, wherein the scanning angle range is 20-100 ℃, and the scanning speed is 4 DEG/min;
and step C, grinding the alloy ingot into a sheet with the thickness of 30 microns, cutting the sheet into small pieces by using a scalpel, selecting the small pieces with the size of 50-80 microns under a microscope, loading the small pieces into a T301 seal cushion sample cavity with the diameter of phi 100 microns, providing high pressure to a top anvil by using silicon oil as a pressure transmission medium, and obtaining the structure of the light rare earth high-entropy alloy under the high pressure by using in-situ high-pressure synchrotron radiation X-rays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010018097.4A CN111172445B (en) | 2020-01-08 | 2020-01-08 | High-entropy alloy with double-layer close-packed hexagonal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010018097.4A CN111172445B (en) | 2020-01-08 | 2020-01-08 | High-entropy alloy with double-layer close-packed hexagonal structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111172445A true CN111172445A (en) | 2020-05-19 |
| CN111172445B CN111172445B (en) | 2022-03-22 |
Family
ID=70652572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010018097.4A Active CN111172445B (en) | 2020-01-08 | 2020-01-08 | High-entropy alloy with double-layer close-packed hexagonal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111172445B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113788677A (en) * | 2021-09-28 | 2021-12-14 | 上海电机学院 | High-entropy sesqui-rare earth sulfide ceramic material and preparation method and application thereof |
| CN114308053A (en) * | 2021-12-14 | 2022-04-12 | 上海电力大学 | Denitration catalyst with high-entropy oxide as active component, and preparation and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012011946A2 (en) * | 2010-07-20 | 2012-01-26 | Iowa State University Research Foundation, Inc. | Method for producing la/ce/mm/y base alloys, resulting alloys, and battery electrodes |
| CN102534438A (en) * | 2011-12-30 | 2012-07-04 | 燕山大学 | Diamond anvil cell zirconium-base amorphous alloy seal pad and preparation method thereof |
| CN104946912A (en) * | 2015-07-14 | 2015-09-30 | 太原理工大学 | Rear earth high-entropy alloy of close-packed hexagonal structure |
| CN110592457A (en) * | 2019-09-27 | 2019-12-20 | 太原理工大学 | Rare earth element high-entropy alloy material and preparation method thereof |
| CN110656272A (en) * | 2019-11-08 | 2020-01-07 | 微山钢研稀土材料有限公司 | Magnesium-based hydrogen storage material based on high entropy effect and preparation method thereof |
-
2020
- 2020-01-08 CN CN202010018097.4A patent/CN111172445B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012011946A2 (en) * | 2010-07-20 | 2012-01-26 | Iowa State University Research Foundation, Inc. | Method for producing la/ce/mm/y base alloys, resulting alloys, and battery electrodes |
| CN102534438A (en) * | 2011-12-30 | 2012-07-04 | 燕山大学 | Diamond anvil cell zirconium-base amorphous alloy seal pad and preparation method thereof |
| CN104946912A (en) * | 2015-07-14 | 2015-09-30 | 太原理工大学 | Rear earth high-entropy alloy of close-packed hexagonal structure |
| CN110592457A (en) * | 2019-09-27 | 2019-12-20 | 太原理工大学 | Rare earth element high-entropy alloy material and preparation method thereof |
| CN110656272A (en) * | 2019-11-08 | 2020-01-07 | 微山钢研稀土材料有限公司 | Magnesium-based hydrogen storage material based on high entropy effect and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 中国兵器工业集团第二一○研究所: "《先进材料领域科技发展报告》", 30 September 2018, 国防工业出版社 * |
| 于鹏飞: "极端条件下高熵合金组织结构及性能研究", 《中国优秀博士学位论文全文数据库(电子期刊) 工程科技Ⅰ辑》 * |
| 赵亚杰: "密排六方结构稀土高熵合金及其力学性能", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113788677A (en) * | 2021-09-28 | 2021-12-14 | 上海电机学院 | High-entropy sesqui-rare earth sulfide ceramic material and preparation method and application thereof |
| CN113788677B (en) * | 2021-09-28 | 2022-10-11 | 上海电机学院 | High-entropy sesqui-rare earth sulfide ceramic material and preparation method and application thereof |
| CN114308053A (en) * | 2021-12-14 | 2022-04-12 | 上海电力大学 | Denitration catalyst with high-entropy oxide as active component, and preparation and application thereof |
| CN114308053B (en) * | 2021-12-14 | 2024-03-26 | 上海电力大学 | Denitration catalyst taking high-entropy oxide as active component and preparation and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111172445B (en) | 2022-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3029689B1 (en) | Method for increasing coercive force of magnets | |
| KR101030267B1 (en) | Rare earth permanent magnet | |
| RU2417138C2 (en) | Method of producing rare-earth permanent magnet material | |
| EP1705670B1 (en) | Functionally graded rare earth permanent magnet | |
| US10269488B2 (en) | Preparation of permanent magnet material | |
| CN111172445B (en) | High-entropy alloy with double-layer close-packed hexagonal structure | |
| CN106910615B (en) | The preparation method of corrosion-resistant Ne-Fe-B magnet | |
| EP2128290A1 (en) | R-t-b base alloy, process for production thereof, fine powder for r-t-b base rare earth permanent magnet, and r-t-b base rare earth permanent magnet | |
| BRPI0600224B1 (en) | PERMANENT RARE EARTH MAGNET WITH GRADUATE FUNCTIONALITY | |
| KR102631761B1 (en) | Neodymium iron boron magnetic material, raw material composition, manufacturing method and application | |
| JP7253071B2 (en) | RTB Permanent Magnet Material, Manufacturing Method, and Application | |
| CN108305735B (en) | High-performance high-resistivity sintered samarium-cobalt permanent magnet material, and preparation method and application thereof | |
| WO2016086777A1 (en) | Method for preparing performance improved rare-earth permanent magnet material and rare-earth permanent magnet material | |
| JP5877517B2 (en) | Sputtering target for rare earth magnet and manufacturing method thereof | |
| CN102651263A (en) | Preparation method of samarium-cobalt (SmCo) system sintered materials | |
| JP2023512541A (en) | Fine crystal, high coercive force neodymium iron boron sintered magnet and its production method | |
| CN107464684B (en) | Method for treating sintered magnet | |
| JP2024504209A (en) | Rare earth permanent magnet and its manufacturing method | |
| JP2021075787A (en) | Anisotropic bonded magnetic powder and preparation method thereof | |
| CN115637394B (en) | Cobalt-reinforced iron-nickel-based hard magnetic alloy and preparation method thereof | |
| CN113571279B (en) | Magnet and method for manufacturing the same | |
| CN111462974B (en) | High-performance double-main-phase composite rare earth permanent magnet material and preparation method thereof | |
| WO2016155674A1 (en) | Ho and w-containing rare-earth magnet | |
| CN108133797B (en) | A kind of inhibition CeFe2The preparation method of the mischmetal iron boron magnet of phase | |
| CN115938707A (en) | Rare earth permanent magnetic material with excellent temperature resistance and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |