CN111128541A - Microwave sintering method of neodymium iron boron magnet - Google Patents
Microwave sintering method of neodymium iron boron magnet Download PDFInfo
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- CN111128541A CN111128541A CN201911375578.4A CN201911375578A CN111128541A CN 111128541 A CN111128541 A CN 111128541A CN 201911375578 A CN201911375578 A CN 201911375578A CN 111128541 A CN111128541 A CN 111128541A
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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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- 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
- H01F41/0273—Imparting anisotropy
Abstract
The invention discloses a microwave sintering method of a neodymium iron boron magnet, which comprises the following steps: preparing neodymium iron boron raw materials, and preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing; placing the neodymium iron boron green blank in a microwave reactor, pre-sintering under the protection of inert gas, and cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface; coating Dy/Tb on the surface of the clean neodymium iron boron to form a Dy/Tb element attaching layer; and (3) placing the neodymium iron boron coated with the adhesion layer into a microwave reactor for microwave heat treatment under the protection of inert gas to obtain the neodymium iron boron magnet. According to the invention, microwave is adopted for heat treatment, the microwave frequency is controlled to be 433-2450 +/-50 MHz, so that the inside and the outside of the material are uniformly heated, the prepared neodymium iron boron magnet has high remanence, high coercivity and high magnetic energy product, and the performance of the prepared neodymium iron boron magnet is far superior to that of neodymium iron boron prepared by a conventional method.
Description
Technical Field
The invention relates to the field of rare earth, in particular to a microwave sintering method of neodymium iron boron.
Background
Neodymium iron boron (NdFeB) is a third generation rare earth permanent magnet material, has the advantages of high remanence density, high coercivity and high magnetic energy product, is a permanent magnet material with the strongest magnetism so far, and is widely applied to various fields in industrial production and residential life. In recent years, with the rapid expansion of the application field of the neodymium iron boron magnet, the demand of raw materials has become larger, but the cost of rare earth mining is higher, and the material cost is gradually increased along with the increase of national regulation and control. Under the conditions that the current price has large price spread and the price bearing capacity of the downstream market is limited, part of downstream enterprises select to use cheaper ferrite or alnico, samarium cobalt and other materials to replace rare earth in the raw materials of the neodymium iron boron magnet, which brings great instability to the neodymium iron boron magnet market.
The production process of the prior known sintered neodymium iron boron comprises the following steps: preparing materials, smelting, hydrogen crushing, airflow milling, molding, isostatic pressing, sintering and post-processing to obtain the neodymium iron boron permanent magnet. In addition to the cost increase caused by the increase of raw materials, the largest energy consumption in the preparation process is the sintering process, and the sintering process needs to be carried out for a longer time under the conditions of high temperature and high pressure, so that the cost of the preparation process is increased; and the prepared neodymium iron boron is unstable due to uneven heating from outside to inside in the process of calcining and heating, so that the subsequent processing is inconvenient.
In the current research, in order to improve the coercive force of sintered neodymium iron boron, a grain boundary diffusion technology is developed. Sintered Nd-Fe-B grain boundary diffusion rare earth and rare earth alloy are a new coercivity strengthening technology which is emerging in recent years. The sintered Nd-Fe-B magnet grain boundary diffusion process is characterized in that a layer of metal or compound containing rare earth elements is attached to the surface of the sintered Nd-Fe-B magnet, heat treatment is carried out above the melting point of a neodymium (Nd) -rich phase, the grain boundary diffusion characteristic is far higher than that of bulk diffusion, the grain boundary phase is melted in the tempering process, the reaction with a diffusion substance is accelerated, the local chemical components and structural characteristics near the grain boundary are changed, the coercive force of the magnet is improved, and meanwhile, remanence is hardly damaged. When the diffusion source adopted by the method at present is alloy or compound containing Dy/Tb (dysprosium/terbium), the subsequent process needs high temperature (over 800 ℃) for long time (5-7 hours) diffusion treatment to enable heavy rare earth elements such as Dy/Tb to enter the sintered neodymium iron boron magnet due to the high melting point of the diffusion source, the diffusion efficiency is low, high-temperature calcination diffusion needs to be carried out again, multiple devices are needed, and the process is complex.
Disclosure of Invention
The invention aims to provide a method for preparing a neodymium iron boron magnet by replacing the traditional sintering mode with microwave heating, wherein a Dy/Tb (dysprosium/terbium) attachment layer is attached to the surface of the neodymium iron boron magnet after pre-sintering, and the neodymium iron boron magnet with high coercivity is prepared by performing microwave heat treatment again.
The purpose of the invention is realized by the following technical scheme:
a microwave sintering method of a neodymium iron boron magnet comprises the following steps: preparing neodymium iron boron raw materials, preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing,
(1) placing the neodymium iron boron green blank in a microwave reactor, pre-sintering under the protection of inert gas, and cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface;
(2) coating Dy/Tb on the surface of the clean neodymium iron boron to form a Dy/Tb element attaching layer;
(3) and (3) placing the neodymium iron boron coated with the adhesion layer into a microwave reactor for microwave heat treatment under the protection of inert gas to obtain the neodymium iron boron magnet.
Preferably, in the step (1), the pre-sintering temperature is 800-900 ℃ and the time is 0.5-1 h.
Preferably, in the step (3), the microwave heat treatment is divided into two stages, wherein the first stage is grain boundary diffusion, and the second stage is medium temperature tempering treatment.
Preferably, the grain boundary diffusion stage is subjected to microwave-assisted osmotic diffusion under high pressure, wherein the microwave heating temperature control range is 550-850 ℃, and the pressure and heat preservation time is 0.5-1 h.
Preferably, the temperature of the medium-temperature tempering treatment stage is 350-550 ℃, and the time is 1-2 h.
Preferably, the Dy/Tb adhesion layer comprises Dy/Tb metal or a Dy/Tb compound.
Preferably, the pressure setting range of the grain boundary diffusion stage is 0.5-3.0 MPa. In the pressure range, the diffusion speed of the grain boundary can be promoted, and the permeation and diffusion of the adhesion layer can be accelerated.
Preferably, the microwave output mode comprises continuous wave or pulse wave or a combination mode thereof, and the temperature controllable range is 350-900 ℃.
Preferably, the power of the continuous wave is 0.5-20 kW, and the frequency is 433-2450 +/-50 MHz.
Preferably, the power of the pulse wave is 5-50 kW, and the frequency is 433-2450 +/-50 MHz.
The invention has the following beneficial effects:
1. according to the invention, Dy/Tb is attached to the neodymium iron boron magnet through secondary microwave treatment to carry out grain boundary diffusion to prepare the neodymium iron boron magnet with high coercivity, the microwave frequency is controlled to be 433-2450 +/-50 MHz, the heat efficiency is high, the grain boundary diffusion speed of the attachment layer is fast, the time is short, the inside and outside of the material are uniformly heated, the prepared neodymium iron boron magnet has fewer defects, and the performance is better.
2. According to the invention, the neodymium iron boron green body is pre-sintered, the neodymium iron boron green body is solidified, at the moment, the neodymium iron boron is in a critical state, anisotropy exists at the crystal phase edge of the neodymium iron boron magnet, then Dy/Tb is coated on the surface of the neodymium iron boron magnet to carry out grain boundary diffusion, the Dy/Tb can easily enter the grain boundary of the neodymium iron boron magnet and is preferentially distributed at the main phase crystal grain edge, the magnetocrystalline anisotropy in an uneven area is improved, the diffusion efficiency is higher, the diffusion rate is higher along with the increase of pressure, the prepared neodymium iron boron magnet has fewer defects and better performance.
3. According to the invention, microwaves are adopted for heat treatment, the frequency of the microwaves is controlled to be 433-2450 +/-50 MHz, so that the inside and the outside of the material are uniformly heated, the temperature of each heat treatment stage is controlled by controlling the frequency of different stages, and the controllability is better; compared with the conventional method, the remanence, the coercive force and the magnetic energy product of the neodymium iron boron magnet prepared by the method are obviously improved, the neodymium iron boron magnet prepared by the method has high remanence, high coercive force and high magnetic energy product, and the performance of the neodymium iron boron magnet is far superior to that of the neodymium iron boron prepared by the conventional method.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the following will clearly and completely describe the technical solutions in the present application with reference to the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts based on the embodiments in the present application shall fall within the protection scope of the present application.
Example 1
A microwave sintering method of a neodymium iron boron magnet comprises the following steps: preparing neodymium iron boron raw materials, preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing,
(1) placing the neodymium iron boron green blank in a microwave reactor, pre-sintering under the protection of inert gas, adopting continuous waves (the power of the continuous waves is 15kW, the frequency is 915MHz), the pre-sintering temperature is 900 ℃, the time is 0.5h, and then cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface;
(2) coating Dy/Tb on the surface of the clean neodymium iron boron to form a Dy/Tb attachment layer containing Dy/Tb metal;
(3) placing the neodymium iron boron coated with the adhesive layer into a microwave reactor to perform microwave heat treatment under the protection of inert gas, wherein the microwave heat treatment is divided into two stages, the first stage is a crystal boundary diffusion stage, the crystal boundary diffusion is performed under 2.0Mpa, continuous waves (the power of the continuous waves is 5.0kW, the frequency is 915 +/-50 MHz) are adopted, the microwave heating temperature control range is 850 ℃, and the pressure and heat preservation time is 0.5 h; the second stage is a medium temperature tempering treatment stage, continuous waves (the power of the continuous waves is 2.0kW, the frequency is 915 +/-50 MHz) are adopted, the temperature of the medium temperature tempering treatment is 550 ℃, and the time is 1 hour, so that the neodymium iron boron magnet is obtained.
Example 2
A microwave sintering method of a neodymium iron boron magnet comprises the following steps: preparing neodymium iron boron raw materials, preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing,
(1) placing the neodymium iron boron green blank in a microwave reactor, pre-sintering under the protection of inert gas, adopting continuous waves (the power of the continuous waves is 20kW, the frequency is 433MHz), the pre-sintering temperature is 880 ℃, the time is 0.6h, and then cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface;
(2) coating Dy/Tb on the surface of the clean neodymium iron boron to form a Dy/Tb attachment layer containing Dy/Tb metal;
(3) placing the neodymium iron boron coated with the adhesive layer into a microwave reactor to perform microwave heat treatment under the protection of inert gas, wherein the microwave heat treatment is divided into two stages, the first stage is a crystal boundary diffusion stage, the crystal boundary diffusion is performed under 1.0Mpa, microwave-assisted permeation diffusion is performed by adopting pulse waves (the power of the pulse waves is 15kW, the frequency is 433MHz), the microwave heating temperature control range is 850 ℃, and the pressure and heat preservation time is 0.5 h; the second stage is a medium temperature tempering treatment stage, pulse waves (the power of the pulse waves is 10kW, the frequency is 433MHz) are adopted, the temperature of the medium temperature tempering treatment is 550 ℃, and the time is 1h, so that the neodymium iron boron magnet is obtained.
Example 3
A microwave sintering method of a neodymium iron boron magnet comprises the following steps: preparing neodymium iron boron raw materials, preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing,
(1) placing the neodymium iron boron green blank in a microwave reactor, presintering under the protection of inert gas by adopting continuous waves (the power of the continuous waves is 10kW, the frequency is 2450MHz), the presintering temperature is 800 ℃, the time is 1h, and then cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface;
(2) coating Dy/Tb (dysprosium/terbium) element on the surface of the clean neodymium iron boron to form a Dy/Tb element adhesion layer of a Dy/Tb compound;
(3) putting the neodymium iron boron coated with the adhesive layer into a microwave reactor, and carrying out microwave heat treatment under the protection of inert gas, wherein the microwave heat treatment is divided into two stages, the first stage is a crystal boundary diffusion stage, the crystal boundary diffusion is carried out under 0.5Mpa, pulse waves (the power of the pulse waves is 30kW, the frequency is 2450 +/-50 MHz) are adopted, the microwave heating temperature control range is 650 ℃, and the pressure and heat preservation time is 0.7 h; the second stage is a medium temperature tempering treatment stage, continuous waves (the power of the continuous waves is 15kW, the frequency is 2450 +/-50 MHz) are adopted, the temperature of the medium temperature tempering treatment is 350 ℃, and the time is 1.5 hours, so that the neodymium iron boron magnet is obtained.
Example 4
A microwave sintering method of a neodymium iron boron magnet comprises the following steps: preparing neodymium iron boron raw materials, preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing,
(1) placing the neodymium iron boron green blank in a microwave reactor, pre-sintering under the protection of inert gas, adopting continuous waves (the power of the continuous waves is 12kW, the frequency is 915MHz), the pre-sintering temperature is 850 ℃, the time is 0.8h, and then cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface;
(2) coating Dy/Tb (dysprosium/terbium) element on the surface of the clean neodymium iron boron to form a Dy/Tb element adhesion layer of a Dy/Tb compound;
(3) placing the neodymium iron boron coated with the adhesive layer into a microwave reactor to perform microwave heat treatment under the protection of inert gas, wherein the microwave heat treatment is divided into two stages, the first stage is a crystal boundary diffusion stage, the crystal boundary diffusion is performed under 3.0Mpa, pulse waves (the power of the pulse waves is 50kW, the frequency is 433 +/-50 MHz) are adopted, the microwave heating temperature control range is 550 ℃, and the pressure and heat preservation time is 1 h; the second stage is a medium-temperature tempering treatment stage, pulse waves (the power of the pulse waves is 5kW, the frequency is 2450 +/-50 MHz) are adopted, the temperature of the medium-temperature tempering treatment is 350 ℃, and the time is 2 hours, so that the neodymium-iron-boron magnet is obtained.
The nd-fe-b magnets prepared in examples 1-4 were subjected to performance testing, and the results are shown in table 1:
TABLE 1 Performance test results for NdFeB magnets
| Diffusion treatment time (h) | Remanence (kGS) | Coercive force (KOe) | Magnetic energy product (BH)max/MGOe) | |
| Example 1 | 1.5 | 14.68 | 19.35 | 49.11 |
| Example 2 | 1.5 | 14.62 | 19.24 | 48.97 |
| Example 3 | 2.2 | 14.39 | 18.97 | 47.84 |
| Example 4 | 3.0 | 14.18 | 18.62 | 48.65 |
| Conventional methods | 5-7 | 12.87 | 13.49 | 42.58 |
Note: the conventional method refers to the production process of the sintered neodymium iron boron which is known at present and mentioned in the background of the invention, namely 'batching-smelting-hydrogen crushing-airflow milling-forming-isostatic pressing-sintering-post-processing'.
As can be seen from the table, compared with the conventional method, the remanence, the coercive force and the magnetic energy product of the neodymium iron boron magnet prepared by the method are obviously improved, the neodymium iron boron magnet prepared by the method has high remanence, high coercive force and high magnetic energy product, and the performance is far superior to that of the neodymium iron boron prepared by the conventional method.
According to the invention, microwave is adopted for heat treatment, the microwave frequency is controlled to be 433-2450 +/-50 MHz, so that the heat efficiency is high, the grain boundary diffusion speed of the attachment layer is high, the time is short, the inside and outside of the material are uniformly heated, the temperature of each heat treatment stage is controlled by controlling the frequency of different stages, the controllability is better, the defects of the prepared neodymium iron boron magnet are fewer, and the performance is better.
Claims (10)
1. A microwave sintering method of a neodymium iron boron magnet comprises the following steps: the method is characterized by comprising the following steps of preparing neodymium iron boron raw materials, and preparing neodymium iron boron green blanks through smelting, hydrogen crushing, airflow milling, magnet taking and forming and isostatic pressing, wherein the neodymium iron boron raw blanks are characterized in that:
(1) placing the neodymium iron boron green blank in a microwave reactor, pre-sintering under the protection of inert gas, and cleaning the surface of the neodymium iron boron green blank to obtain neodymium iron boron with a clean surface;
(2) coating Dy/Tb on the surface of the clean neodymium iron boron to form a Dy/Tb element attaching layer;
(3) and (3) placing the neodymium iron boron coated with the adhesion layer into a microwave reactor for microwave heat treatment under the protection of inert gas to obtain the neodymium iron boron magnet.
2. The microwave sintering method of neodymium iron boron magnet according to claim 1, characterized in that: the temperature of the pre-sintering in the step (1) is 800-900 ℃, and the time is 0.5-1 h.
3. The microwave sintering method of neodymium iron boron magnet according to claim 1, characterized in that: the microwave heat treatment in the step (3) is divided into two stages, wherein the first stage is grain boundary diffusion, and the second stage is medium-temperature tempering treatment.
4. The microwave sintering method of neodymium iron boron magnet according to claim 3, characterized in that: and in the grain boundary diffusion stage, microwave-assisted osmotic diffusion is carried out under high pressure, the microwave heating temperature control range is 550-850 ℃, and the pressure and heat preservation time is 0.5-1 h.
5. The microwave sintering method of neodymium iron boron magnet according to claim 3, characterized in that: the temperature of the medium-temperature tempering treatment stage is 350-550 ℃, and the time is 1-2 h.
6. The microwave sintering method of neodymium iron boron magnet according to claim 1, characterized in that: the Dy/Tb element adhesion layer comprises Dy/Tb metal or a Dy/Tb compound.
7. The microwave sintering method of neodymium iron boron magnet according to claim 4, characterized in that: the pressure setting range of the grain boundary diffusion stage is 0.5-3.0 MPa.
8. The microwave sintering method of neodymium iron boron magnet according to any one of claims 2, 4 and 5, characterized in that: the microwave output mode comprises continuous wave or pulse wave or a combination mode thereof, and the temperature controllable range is 350-900 ℃.
9. The microwave sintering method of neodymium iron boron magnet according to any one of claim 8, characterized by: the power of the continuous wave is 0.5-20 kW, and the frequency is 433-2450 +/-50 MHz.
10. The microwave sintering method of neodymium iron boron magnet according to any one of claim 8, characterized by: the power of the pulse wave is 5-50 kW, and the frequency is 433-2450 +/-50 MHz.
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| US20130266473A1 (en) * | 2012-04-05 | 2013-10-10 | GM Global Technology Operations LLC | Method of Producing Sintered Magnets with Controlled Structures and Composition Distribution |
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| US20130266473A1 (en) * | 2012-04-05 | 2013-10-10 | GM Global Technology Operations LLC | Method of Producing Sintered Magnets with Controlled Structures and Composition Distribution |
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Effective date of registration: 20211208 Address after: No.98 Daling Road, XiXiangTang District, Nanning City, Guangxi Zhuang Autonomous Region Applicant after: GUANGXI ACADEMY OF SCIENCES Applicant after: Guangxi Zhongke microwave Advanced Manufacturing Technology Research Institute Applicant after: Nanning Zhongke microwave advanced manufacturing industry technology Research Institute Address before: No.98 Daling Road, XiXiangTang District, Nanning City, Guangxi Zhuang Autonomous Region Applicant before: GUANGXI ACADEMY OF SCIENCES |
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Correction item: Applicant|Address|Applicant Correct: Guangxi Academy of Sciences|No.98 Daling Road, XiXiangTang District, Nanning City, Guangxi Zhuang Autonomous Region|Guangxi Zhongke microwave advanced manufacturing industry technology research institute|Nanning Zhongke microwave advanced manufacturing industry technology research institute False: Guangxi Academy of Sciences|No.98 Daling Road, XiXiangTang District, Nanning City, Guangxi Zhuang Autonomous Region|Guangxi Zhongke microwave Advanced Manufacturing Technology Research Institute|Nanning Zhongke microwave advanced manufacturing industry technology research institute Number: 52-01 Volume: 37 |