CN110783099A - Surface coating method for improving coercive force of rare earth permanent magnet - Google Patents
Surface coating method for improving coercive force of rare earth permanent magnet Download PDFInfo
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- CN110783099A CN110783099A CN201910979470.XA CN201910979470A CN110783099A CN 110783099 A CN110783099 A CN 110783099A CN 201910979470 A CN201910979470 A CN 201910979470A CN 110783099 A CN110783099 A CN 110783099A
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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
- H01F41/14—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 applying magnetic films to substrates
- H01F41/22—Heat treatment; Thermal decomposition; Chemical vapour deposition
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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
- H01F41/14—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 applying magnetic films to substrates
Abstract
The invention discloses a surface coating method for improving coercivity of rare earth permanent magnet, which comprises the following steps: A. spraying the rare earth mixed solution on the surface of the permanent magnet by adopting a laser coating machine; B. and (B) carrying out heat treatment on the sprayed permanent magnet, wherein the rare earth mixed liquor in the step A consists of neodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid composite phosphate and water, and the components in parts by weight are as follows: 3-6 parts of neodymium; 2-6 parts of promethium; 2-5 parts of samarium; 3-8 parts of europium; 4-10 parts of holmium. On the premise of not introducing excessive impurity additives and not influencing the structure (corrosion, oxidation and the like) of the permanent magnet, the coercive force of the permanent magnet can be greatly improved (the coercive force of the permanent magnet is improved by more than 5000A/m on the original basis) by using less rare earth, the production cost of the permanent magnet is effectively reduced, the remanence and the magnetic energy product are not influenced, the coercive force is greatly improved, and meanwhile, the operation process is simple and is suitable for large-scale industrial application.
Description
Technical Field
The invention relates to the technical field of permanent magnets, in particular to a surface coating method for improving coercivity of a rare earth permanent magnet.
Background
The magnet capable of keeping the magnetism thereof for a long time is called a permanent magnet, such as a natural magnet (magnetite), an artificial magnet (alnico) and the like, besides the permanent magnet, an electromagnet which is magnetic only when being electrified is also arranged in the magnet, along with the increasing demand of hybrid electric vehicles, pure electric vehicles and energy-saving air-conditioning compressors, the demand of a rare earth permanent magnet material with high coercivity (such as an R-Fe-B system rare earth permanent magnet) is also increased, and the traditional method for improving the coercivity needs to use a large amount of rare earth elements, so that the cost of the magnet is greatly increased, and the product of partial remanence and magnetic energy is sacrificed.
Disclosure of Invention
The present invention is directed to a surface coating method for improving coercivity of rare earth permanent magnet, which solves the above problems of the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a surface coating method for improving coercivity of rare earth permanent magnet comprises the following steps:
A. spraying the rare earth mixed solution on the surface of the permanent magnet by adopting a laser coating machine;
B. and carrying out heat treatment on the sprayed permanent magnet.
Preferably, the rare earth mixed liquor in the step a is composed of neodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid-form composite phosphate and water, and the components in parts by weight are as follows: 3-6 parts of neodymium; 2-6 parts of promethium; 2-5 parts of samarium; 3-8 parts of europium; 4-10 parts of holmium; 1-4 parts of ytterbium; 110 portions and 130 portions of tetrabutyl titanate; 50-80 parts of acid type composite phosphate; 100 portions of water and 200 portions of water.
Preferably, the neodymium, promethium, samarium, europium, holmium and ytterbium are subjected to ball milling treatment before the rare earth mixed solution is prepared, and the mesh number is 400-800 meshes.
Preferably, the laser energy of the laser coating machine in the step A is 3000-7000W, the diameter of the laser beam is 1-3mm, the laser scanning rate is 10-25mm/s, the thickness of the rare earth mixed liquid coating is 100-350um, and meanwhile, the laser coating machine is further provided with a waste liquid recovery mechanism in a matching manner.
Preferably, waste liquid recovery mechanism includes that the top passes through the pipeline intercommunication with laser coating machine coating platform bottom, and the waste liquid collecting box of the liquid outlet is seted up to the bottom to and set gradually the two-layer filter screen in waste liquid collecting box inner chamber upper end from the top down, simultaneously, waste liquid collecting box inner chamber bottom still be provided with turbidity sensor and with turbidity sensor electric connection set up in the display at waste liquid collecting box top.
Preferably, the heat treatment in the step B comprises reduction treatment and diffusion treatment, the heating temperature in the reduction treatment is 500-900 ℃, and the reduction time is 2-4 h; the heating temperature in the diffusion treatment is 600-.
Preferably, step A and step B still form a complete set and are equipped with purification mechanism, and purify the mechanism and include that the air inlet end passes through pipeline and laser coating machine and heat treatment box top, the air-out end passes through the fan of pipeline intercommunication purifying box intercommunication, and the inner chamber from the top down of purifying box has set gradually the three-layer filter screen, the filling opening that supplies acid-base neutralization solution to pour into is seted up to purifying box one side and the corresponding position that is located the lower floor filter screen, and simultaneously, the through-hole of the sealed lid of terminal threaded connection is all seted up to the top and the bottom of purifying box.
Preferably, a conveying mechanism is further arranged between the step A and the step B and comprises conveying rollers which are arranged at a plurality of equal distances and connected through a belt, and supports with supporting legs are mounted on the periphery of the bottoms of the conveying rollers, and an output shaft of one side of each support is fixedly mounted with a motor which is in transmission connection with one of the conveying rollers through the belt.
Compared with the prior art, the invention has the following beneficial effects:
on the premise of not introducing excessive impurity additives and not influencing the structure (corrosion, oxidation and the like) of the permanent magnet, the coercive force of the permanent magnet can be greatly improved (the coercive force of the permanent magnet is improved by more than 5000A/m on the original basis) by using less rare earth, the production cost of the permanent magnet is effectively reduced, the remanence and the magnetic energy product are not influenced, the coercive force is greatly improved, and meanwhile, the operation process is simple and is suitable for large-scale industrial application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a surface coating method for improving coercivity of rare earth permanent magnet comprises the following steps:
A. spraying the rare earth mixed solution on the surface of the permanent magnet by adopting a laser coating machine;
B. and carrying out heat treatment on the sprayed permanent magnet.
On the premise of not introducing excessive impurity additives and not influencing the structure (corrosion, oxidation and the like) of the permanent magnet, the coercive force of the permanent magnet can be greatly improved (the coercive force of the permanent magnet is improved by more than 5000A/m on the original basis) by using less rare earth, the production cost of the permanent magnet is effectively reduced, the residual magnetism and the magnetic energy product of the permanent magnet are not influenced, the coercive force is greatly improved, and meanwhile, the operation process is simple and is suitable for large-scale industrial application.
The rare earth mixed liquor in the step A consists of neodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid composite phosphate and water, and comprises the following components in parts by weight: 3 parts of neodymium; 2 parts of promethium; 2 parts of samarium; 3 parts of europium; 4 parts of holmium; 1 part of ytterbium; 110 parts of tetrabutyl titanate; 50 parts of acid type composite phosphate; 100 parts of water.
Neodymium, promethium, samarium, europium, holmium and ytterbium are subjected to ball milling treatment before the rare earth mixed liquor is prepared, and the mesh number is 400.
And B, in the step A, the laser energy of the laser coating machine is 3000W, the diameter of a laser beam is 1mm, the laser scanning speed is 10mm/s, the thickness of the rare earth mixed liquid coating is 100um, and meanwhile, the laser coating machine is also provided with a waste liquid recovery mechanism in a matching manner.
Waste liquid recovery mechanism includes that top and laser coating machine coat platform bottom pass through the pipeline intercommunication, and the waste liquid collecting box of the liquid outlet is seted up to the bottom to and set gradually in the two-layer filter screen of waste liquid collecting box inner chamber upper end from the top down, the filter screen on upper strata is the active alumina filter layer, the filter screen of lower floor is CPP composite filter core, simultaneously, waste liquid collecting box inner chamber bottom still be provided with turbidity sensor and with turbidity sensor electric connection set up in the display at waste liquid collecting box top.
The heat treatment in the step B comprises reduction treatment and diffusion treatment, wherein the heating temperature in the reduction treatment is 500 ℃, and the reduction time is 4 hours; the heating temperature in the diffusion treatment was 600 ℃ and the diffusion time was 3 hours.
Step A and step B still form a complete set and are equipped with purification mechanism, and purification mechanism includes that the air inlet end passes through pipeline and laser coating machine and thermal treatment roof portion, the air-out end passes through the fan of pipeline intercommunication purifying box intercommunication, and the inner chamber from the top down of purifying box has set gradually three-layer filter screen, the filter screen on upper strata is the HEPA filter screen, middle-level filter screen is the sponge filter layer, the filter screen on lower floor is the active carbon filter layer, purifying box one side just is located the corresponding position of the filter screen of lower floor and has seted up the filler that supplies acid-base neutralization solution to pour into, simultaneously, the through-hole of the sealed lid of terminal threaded connection is all seted up to the top.
And a conveying mechanism is further arranged between the step A and the step B, the conveying mechanism comprises a plurality of conveying rollers which are arranged at equal intervals and connected through a belt, and supports with supporting legs are arranged at the periphery of the bottoms of the conveying rollers, and a motor with an output shaft fixedly arranged on one side of each support and in transmission connection with one of the conveying rollers through the belt is arranged.
Example two:
a surface coating method for improving coercivity of rare earth permanent magnet comprises the following steps:
A. spraying the rare earth mixed solution on the surface of the permanent magnet by adopting a laser coating machine;
B. and carrying out heat treatment on the sprayed permanent magnet.
On the premise of not introducing excessive impurity additives and not influencing the structure (corrosion, oxidation and the like) of the permanent magnet, the coercive force of the permanent magnet can be greatly improved (the coercive force of the permanent magnet is improved by more than 5000A/m on the original basis) by using less rare earth, the production cost of the permanent magnet is effectively reduced, the residual magnetism and the magnetic energy product of the permanent magnet are not influenced, the coercive force is greatly improved, and meanwhile, the operation process is simple and is suitable for large-scale industrial application.
The rare earth mixed liquor in the step A consists of neodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid composite phosphate and water, and comprises the following components in parts by weight: 4 parts of neodymium; 4 parts of promethium; 3 parts of samarium; 5 parts of europium; 7 parts of holmium; 2 parts of ytterbium; 120 parts of tetrabutyl titanate; 65 parts of acid type composite phosphate; and 150 parts of water.
Neodymium, promethium, samarium, europium, holmium and ytterbium are subjected to ball milling treatment before the rare earth mixed liquor is prepared, and the mesh number is 600 meshes.
And in the step A, the laser energy of the laser coating machine is 5000W, the diameter of a laser beam is 2mm, the laser scanning speed is 17mm/s, the thickness of the rare earth mixed liquid coating is 220um, and meanwhile, the laser coating machine is also provided with a waste liquid recovery mechanism in a matching manner.
Waste liquid recovery mechanism includes that top and laser coating machine coat the platform bottom and pass through the pipeline intercommunication, and the waste liquid collecting box of the liquid outlet is seted up to the bottom to and set gradually in the two-layer filter screen of waste liquid collecting box inner chamber upper end from the top down, the filter screen on upper strata is the KDF filter layer, the filter screen of lower floor is the active carbon filter layer, simultaneously, waste liquid collecting box inner chamber bottom still be provided with turbidity sensor and with turbidity sensor electric connection set up in the display at waste liquid collecting box top.
The heat treatment in the step B comprises reduction treatment and diffusion treatment, wherein the heating temperature in the reduction treatment is 700 ℃, and the reduction time is 3 h; the heating temperature in the diffusion treatment was 800 ℃ and the diffusion time was 2 hours.
Step A and step B still are supporting to be equipped with purification mechanism, and purification mechanism includes that the air inlet end passes through pipeline and laser coating machine and thermal treatment roof portion, the air-out end passes through the fan of pipeline intercommunication purifying box intercommunication, and the inner chamber from the top down of purifying box has set gradually the three-layer filter screen, the filter screen on upper strata is the quartz sand filter screen, middle-level filter screen is active alumina filter layer, the filter screen on lower floor is polyester fiber water thorn felt layer, purifying box one side just is located the corresponding position of the filter screen of lower floor and sets up the filler that supplies acid-base neutralization solution to pour into, simultaneously, the through-hole of the sealed lid of terminal threaded connection is all seted up to the top and the bottom of purifying.
And a conveying mechanism is further arranged between the step A and the step B, the conveying mechanism comprises a plurality of conveying rollers which are arranged at equal intervals and connected through a belt, and supports with supporting legs are arranged at the periphery of the bottoms of the conveying rollers, and a motor with an output shaft fixedly arranged on one side of each support and in transmission connection with one of the conveying rollers through the belt is arranged.
Example three:
a surface coating method for improving coercivity of rare earth permanent magnet comprises the following steps:
A. spraying the rare earth mixed solution on the surface of the permanent magnet by adopting a laser coating machine;
B. and carrying out heat treatment on the sprayed permanent magnet.
On the premise of not introducing excessive impurity additives and not influencing the structure (corrosion, oxidation and the like) of the permanent magnet, the coercive force of the permanent magnet can be greatly improved (the coercive force of the permanent magnet is improved by more than 5000A/m on the original basis) by using less rare earth, the production cost of the permanent magnet is effectively reduced, the residual magnetism and the magnetic energy product of the permanent magnet are not influenced, the coercive force is greatly improved, and meanwhile, the operation process is simple and is suitable for large-scale industrial application.
The rare earth mixed liquor in the step A consists of neodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid composite phosphate and water, and comprises the following components in parts by weight: 6 parts of neodymium; 6 parts of promethium; 5 parts of samarium; 8 parts of europium; 10 parts of holmium; 4 parts of ytterbium; 130 parts of tetrabutyl titanate; 80 parts of acid type composite phosphate; 200 parts of water.
Neodymium, promethium, samarium, europium, holmium and ytterbium are subjected to ball milling treatment before the rare earth mixed liquor is prepared, and the mesh number is 800 meshes.
And B, in the step A, the laser energy of the laser coating machine is 7000W, the diameter of the laser beam is 3mm, the laser scanning speed is 25mm/s, the thickness of the rare earth mixed liquid coating is 350um, and meanwhile, the laser coating machine is also provided with a waste liquid recovery mechanism in a matched mode.
Waste liquid recovery mechanism includes that top and laser coating machine coat platform bottom pass through the pipeline intercommunication, and the waste liquid collecting box of the liquid outlet is seted up to the bottom, and from the top down sets gradually in the two-layer filter screen of waste liquid collecting box inner chamber upper end, the filter screen on upper strata is acrylic fiber net cloth layer, the filter screen of lower floor is glass fiber coalescence filter core, simultaneously, waste liquid collecting box inner chamber bottom still be provided with turbidity sensor and with turbidity sensor electric connection set up in the display at waste liquid collecting box top.
The heat treatment in the step B comprises reduction treatment and diffusion treatment, wherein the heating temperature in the reduction treatment is 900 ℃, and the reduction time is 2 hours; the heating temperature in the diffusion treatment was 1000 ℃ and the diffusion time was 1 hour.
Step A and step B still are supporting to be equipped with purification mechanism, and purification mechanism includes that the air inlet end passes through pipeline and laser coating machine and thermal treatment roof portion, the air-out end passes through the fan of pipeline intercommunication purifying box intercommunication, and the inner chamber from the top down of purifying box has set gradually three-layer filter screen, the filter screen on upper strata is active silicon filter layer, middle-level filter screen is polyimide fiber acupuncture felt layer, the filter screen on lower floor is polyvinyl chloride filter screen layer, the filling port that supplies acid-base neutralization solution to pour into is seted up to purifying box one side and the corresponding position that is located the filter screen of lower floor, and simultaneously, the through-hole of terminal threaded connection sealed lid is all seted up to the top and the bottom of purifying box.
And a conveying mechanism is further arranged between the step A and the step B, the conveying mechanism comprises a plurality of conveying rollers which are arranged at equal intervals and connected through a belt, and supports with supporting legs are arranged at the periphery of the bottoms of the conveying rollers, and a motor with an output shaft fixedly arranged on one side of each support and in transmission connection with one of the conveying rollers through the belt is arranged.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A surface coating method for improving coercive force of rare earth permanent magnet is characterized in that: the method comprises the following steps:
A. spraying the rare earth mixed solution on the surface of the permanent magnet by adopting a laser coating machine;
B. and carrying out heat treatment on the sprayed permanent magnet.
2. The method for coating a surface of a rare earth permanent magnet for enhancing coercive force according to claim 1, wherein: the rare earth mixed liquor in the step A is composed of neodymium, promethium, samarium, europium, holmium, ytterbium, tetrabutyl titanate, acid composite phosphate and water, and comprises the following components in parts by weight: 3-6 parts of neodymium; 2-6 parts of promethium; 2-5 parts of samarium; 3-8 parts of europium; 4-10 parts of holmium; 1-4 parts of ytterbium; 110 portions and 130 portions of tetrabutyl titanate; 50-80 parts of acid type composite phosphate; 100 portions of water and 200 portions of water.
3. The method of claim 2, wherein the coercivity of the rare earth permanent magnet is increased by: the neodymium, promethium, samarium, europium, holmium and ytterbium are required to be subjected to ball milling treatment before the rare earth mixed solution is prepared, and the mesh number is 400-800 meshes.
4. The method for coating a surface of a rare earth permanent magnet for enhancing coercive force according to claim 1, wherein: and B, in the step A, the laser energy of the laser coating machine is 3000-7000W, the diameter of the laser beam is 1-3mm, the laser scanning speed is 10-25mm/s, the thickness of the rare earth mixed liquid coating is 100-350um, and meanwhile, the laser coating machine is also provided with a waste liquid recovery mechanism in a matching manner.
5. The method of claim 4, wherein the coercivity of the rare earth permanent magnet is increased by: waste liquid recovery mechanism includes that the top passes through the pipeline intercommunication with laser coating machine coating platform bottom, and the waste liquid collecting box of liquid outlet is seted up to the bottom to and set gradually two-layer filter screen in waste liquid collecting box inner chamber upper end from the top down, simultaneously, waste liquid collecting box inner chamber bottom still be provided with turbidity sensor and with turbidity sensor electric connection set up in the display at waste liquid collecting box top.
6. The method for coating a surface of a rare earth permanent magnet for enhancing coercive force according to claim 1, wherein: the heat treatment in the step B comprises reduction treatment and diffusion treatment, the heating temperature in the reduction treatment is 500-900 ℃, and the reduction time is 2-4 h; the heating temperature in the diffusion treatment is 600-.
7. The method for coating a surface of a rare earth permanent magnet for enhancing coercive force according to claim 1, wherein: step A and step B still form a complete set and are equipped with purification mechanism, and purify the mechanism and include that the air inlet end passes through pipeline and laser coating machine and heat treatment box top, the air-out end passes through the fan of pipeline intercommunication purifying box intercommunication, and the inner chamber from the top down of purifying box has set gradually the three-layer filter screen, the filling opening that supplies acid-base neutralization solution to pour into is seted up to purifying box one side and the corresponding position that is located the lowermost layer filter screen, simultaneously, the through-hole of the sealed lid of terminal threaded connection is all seted up to the top and the bottom of purifying box.
8. The method for coating a surface of a rare earth permanent magnet for enhancing coercive force according to claim 1, wherein: still be provided with conveying mechanism between step A and the step B, and conveying mechanism is including setting up a plurality of equidistances and the conveying roller that connects through the belt to and the support of bottom all installation supporting leg all around, and the motor that one side fixed mounting output shaft of support passes through the belt and is connected with one of them conveying roller transmission.
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Application publication date: 20200211 |