CN108962521A - A kind of electromagnetic shielding preparation method of magnetic material - Google Patents
A kind of electromagnetic shielding preparation method of magnetic material Download PDFInfo
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- CN108962521A CN108962521A CN201810769676.5A CN201810769676A CN108962521A CN 108962521 A CN108962521 A CN 108962521A CN 201810769676 A CN201810769676 A CN 201810769676A CN 108962521 A CN108962521 A CN 108962521A
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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
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
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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
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
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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
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0317—Manganites
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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
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Abstract
The invention discloses a kind of preparation methods of electromagnetic shielding magnetic material, the technique is by cobalt chloride, manganese oxide, the magnetic material and magnesia of nickel oxide combination, boron carbide, aluminium oxide, copper oxide, spinelle, the non-magnetic material of diatomite composition adds 2- amino-terephthalic acid (TPA) after wet ball grinding and freeze-drying process respectively, methanol, acrylonitrile, toluene, dimethyl sulfoxide, the raw materials such as stabilizer reaction, then pass through gradient smelting respectively, twin-screw extrusion, mold, liquid nitrogen rapid cooling, freezing solidification, it is dried with nitrogen, high-temperature vapor washing, naturally dry and etc. electromagnetic shielding magnetic material is prepared.The electromagnetic shielding magnetic material being prepared, long service life, electromagnetic performance is good, can satisfy a variety of demands in industry.
Description
Technical field
The present invention relates to this technical fields of electronics new material, are related specifically to a kind of system of electromagnetic shielding magnetic material
Preparation Method.
Background technique
Magnetic material is that the material that certain mode is reacted can be made to magnetic field.Magnetic is showed in external magnetic field according to substance
The power of property, can be classified as diamagnetic substance, paramagnet, ferromagnetic material, antiferromagnetic substance and ferrimagnetism object
Matter.Most of materials are diamagnetisms or paramagnetic, and the reaction of their external magnetic fields is weaker.Ferromagnetic material and ferrimagnetism substance
It is ferromagnetic substance, usually said magnetic material refers to strong magnetic material.For magnetic material, magnetization curve and magnetic hysteresis
Loop line is the characteristic curve for reflecting its basic magnetic energy.Ferrimagnet is usually Fe, Co, Ni element and its alloy, rare earth member
The compound of element and its alloy and some Mn.Magnetic material according to its magnetized complexity, be generally divided into soft magnetic materials and
Hard magnetic material.Experiment shows that any substance can more or less be magnetized in external magnetic field, and only magnetized degree is not
Together.The characteristic shown in external magnetic field according to substance, substance can be divided into five classes: paramagnet, diamagnetic substance, ferromagnetism
Substance, ferrimagnetism substance, diamagnetic substance.According to molecular current hypothesis, substance should show substantially similar in magnetic field
Characteristic, but teach that characteristic difference of the substance in external magnetic field is very big herein.
With the development of modern high technology, electromagnetic interference (EMI) and electromagnetic compatibility (EMC) problem day caused by electromagnetic wave
It is beneficial serious, not only electronic instrument, equipment are interfered and are damaged, its normal T is influenced and makees, it is serious restrict China's electronic product and
The international competitiveness of equipment, and pollute the environment, endanger human health；In addition electromagnetic-wave leakage can also jeopardize national information
The safety of safety and military vital strategic secrets.Substantive dash forward is had been achieved with especially as the electromagnetic pulse weapon of new concept weapon
It is broken, electronic equipment, electric system etc. can directly be hit, cause the temporary failure or permanent damage of information system etc.
It is bad, mode multiplicity is delivered, destructive power is extremely strong, and powerful electromagnetic pulse can also damage human body, and it is disorderly to make one nerve
Disorderly, behavior is out of control etc..Therefore, efficient electromagnetic shielding material is explored, electromagnetic interference caused by electromagnetic wave and electromagnetic compatibility are prevented
Problem promotes international competitiveness, prevents beating for electromagnetic pulse weapon for improving the security reliability of electronic product and equipment
It hits, it is ensured that the safe and smooth of information communication system, network system, Transmission system, weapon platform etc. all has important meaning.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention discloses a kind of preparation methods of electromagnetic shielding magnetic material, should
Technique by cobalt chloride, manganese oxide, nickel oxide combination magnetic material and magnesia, boron carbide, aluminium oxide, copper oxide, spinelle,
The non-magnetic material of diatomite composition adds 2- amino-terephthaldehyde after wet ball grinding and freeze-drying process respectively
The raw materials such as acid, methanol, acrylonitrile, toluene, dimethyl sulfoxide, stabilizer reaction, are then squeezed by gradient smelting, twin-screw respectively
Out, mold, liquid nitrogen rapid cooling, freezing solidify, be dried with nitrogen, high-temperature vapor wash, naturally dry and etc. be prepared
Electromagnetic shielding uses magnetic material.The electromagnetic shielding magnetic material being prepared, long service life, electromagnetic performance is good, can be with
Meet a variety of demands in industry.
Technical solution: to solve the above-mentioned problems, the invention discloses a kind of preparation sides of electromagnetic shielding magnetic material
Method, comprising the following steps:
(1) by by 3-7 parts of cobalt chloride, 5-9 parts of manganese oxide, 2-5 parts of nickel oxide combination magnetic material mixtures and by oxygen
Change magnesium 1-5 part, 2-6 parts of boron carbide, 3-8 parts of aluminium oxide, 1-3 parts of copper oxide, 1-3 parts of spinelle, 2-4 parts of diatomite form it is non-
Magnetic material mixture is uniformly mixed respectively, is separately added into wet ball mill and is ground 10-24 hours, obtained Magnaglo and
Nonmagnetic powder mixture is sieved sorting respectively；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are carried out at freeze-drying respectively
Reason, obtained magnetic product and non magnetic product are saved backup in -80 DEG C；
(3) 2- amino -3-9 parts of terephthalic acid (TPA), 2-7 parts of methanol, 3-6 parts of acrylonitrile, 1-2 parts of toluene, dimethyl is sub-
3-6 parts of sulfone, 2-5 parts of stabilizer, mixing are added to electric arc furnaces, carry out melting reaction, and temperature is increased to 200 DEG C, insulation reaction
30-90 minutes, magnetic product and non magnetic product in step (2) are added after being naturally cooling to 150 DEG C or less, after mixing evenly
It is warming up to 220-225 DEG C, while being vacuumized in electric arc furnaces, sustained response 2-5 hours, 80-85 DEG C is then cooled to, keeps the temperature 24-
It is 36 hours, spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3)；
(5) liquid nitrogen is sprayed to the casting of step (4) in freezing chamber, makes its rapid cooling, is then freezed in freezing chamber
Solidification 5-10 hours；
(6) then the freezing casting for taking out step (5) is rinsed with high-temperature vapor then with being dried with nitrogen, is natural
It dries and then packs to get finished product.
Preferably, it is 98:1 that the parameter of wet ball-milling, which is ratio of grinding media to material, in the step (1), and ball-milling medium is ethylene glycol, ball
1500 revs/min of revolving speed of mill.
Preferably, freeze-drying parameter is -30 DEG C of cryogenic temperature in the step (2), freezes pressure 25Pa, cooling time
2 hours.
Preferably, the stabilizer in the step (3) is selected from cadmium 2-ethylhexoate, barium laurate, zinc naphthenate, two laurels
One or more of sour dibutyl tin.
Preferably, the vacuum pressure in the step (3) is 50Pa or less.
Preferably, it is 220-260 DEG C that the double screw extruder parameter in the step (4), which is extruder temperature, screw speed
It is 500 revs/min.
Preferably, the high-temperature vapor temperature in the step (6) is 280-300 DEG C.
Compared with prior art, the present invention has the advantages that:
(1) magnetic that the preparation method of electromagnetic shielding magnetic material of the invention combines cobalt chloride, manganese oxide, nickel oxide
Property material and magnesia, boron carbide, aluminium oxide, copper oxide, spinelle, diatomite composition non-magnetic material pass through wet process respectively
2- amino-terephthalic acid (TPA), methanol, acrylonitrile, toluene, dimethyl sulfoxide, stabilization are added after ball milling and freeze-drying process
The raw materials such as agent reaction, then respectively by gradient smelting, twin-screw extrusion, mold, liquid nitrogen rapid cooling, freezing solidification, nitrogen
Drying, high-temperature vapor washing, naturally dry and etc. electromagnetic shielding magnetic material is prepared.The electromagnetic screen being prepared
It covers and uses magnetic material, long service life, electromagnetic performance is good, can satisfy a variety of demands in industry.
(2) electromagnetic shielding of the invention be easy to get with magnetic material raw material, simple process, be suitable for heavy industrialization use,
It is practical.
Specific embodiment
Embodiment 1
(1) by by 3 parts of cobalt chloride, 5 parts of manganese oxide, 2 parts of nickel oxide combination magnetic material mixtures and by magnesia 1
Part, 2 parts of boron carbide, 3 parts of aluminium oxide, 1 part of copper oxide, 1 part of spinelle, 2 parts of the diatomite non-magnetic mixtures formed point
Not Hun Hejunyun, be separately added into wet ball mill and grind 10 hours, obtained Magnaglo and nonmagnetic powder mixture point
It Guo Shai not sort, it is 98:1 that wherein the parameter of wet ball-milling, which is ratio of grinding media to material, and ball-milling medium is ethylene glycol, 1500 turns of rotational speed of ball-mill/
Minute；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are carried out at freeze-drying respectively
Reason, obtained magnetic product and non magnetic product are saved backup in -80 DEG C, wherein freeze-drying parameter is -30 DEG C of cryogenic temperature,
Freeze pressure 25Pa, cooling time 2 hours；
(3) by 2- amino -3 parts of terephthalic acid (TPA), 2 parts of methanol, 3 parts of acrylonitrile, 1 part of toluene, 3 parts of dimethyl sulfoxide, 2-
2 parts of cadmium ethylhexoate, mixing is added to electric arc furnaces, carries out melting reaction, and temperature is increased to 200 DEG C, and insulation reaction 30 is divided
Clock is added magnetic product and non magnetic product in step (2), is warming up to after mixing evenly after being naturally cooling to 150 DEG C or less
220-225 DEG C, while vacuumizing in electric arc furnaces, vacuum pressure is 50Pa hereinafter, sustained response 2 hours, is then cooled to 80-85
DEG C, 24 hours are kept the temperature, it is spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3), wherein double spiral shells
Bar extruder parameter is that extruder temperature is 220 DEG C, and screw speed is 500 revs/min；
(5) liquid nitrogen is sprayed to the casting of step (4) in freezing chamber, makes its rapid cooling, is then freezed in freezing chamber
Solidification 5 hours；
(6) then the freezing casting for taking out step (5) is rinsed then with being dried with nitrogen with high-temperature vapor, high temperature
Steam temperature is 280-300 DEG C, and then then naturally dry is packed to get finished product.
Embodiment 2
(1) by by 4 parts of cobalt chloride, 6 parts of manganese oxide, 3 parts of nickel oxide combination magnetic material mixtures and by magnesia 3
Part, 4 parts of boron carbide, 5 parts of aluminium oxide, 2 parts of copper oxide, 2 parts of spinelle, 3 parts of the diatomite non-magnetic mixtures formed point
Not Hun Hejunyun, be separately added into wet ball mill and grind 15 hours, obtained Magnaglo and nonmagnetic powder mixture point
It Guo Shai not sort, it is 98:1 that wherein the parameter of wet ball-milling, which is ratio of grinding media to material, and ball-milling medium is ethylene glycol, 1500 turns of rotational speed of ball-mill/
Minute；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are carried out at freeze-drying respectively
Reason, obtained magnetic product and non magnetic product are saved backup in -80 DEG C, wherein freeze-drying parameter is -30 DEG C of cryogenic temperature,
Freeze pressure 25Pa, cooling time 2 hours；
(3) by 2- amino -5 parts of terephthalic acid (TPA), 3 parts of methanol, 4 parts of acrylonitrile, 1 part of toluene, dimethyl sulfoxide 4 part, month
3 parts of cinnamic acid barium, mixing is added in electric arc furnaces, carrying out melting reaction, and temperature is increased to 200 DEG C, and insulation reaction 50 minutes, from
Magnetic product and non magnetic product in step (2) are added after being so cooled to 150 DEG C or less, is warming up to 220- after mixing evenly
225 DEG C, while vacuumizing in electric arc furnaces, vacuum pressure is 50Pa hereinafter, sustained response 3 hours, is then cooled to 80-85 DEG C,
Heat preservation 28 hours, it is spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3), wherein double spiral shells
Bar extruder parameter is that extruder temperature is 230 DEG C, and screw speed is 500 revs/min；
(5) liquid nitrogen is sprayed to the casting of step (4) in freezing chamber, makes its rapid cooling, is then freezed in freezing chamber
Solidification 6 hours；
(6) then the freezing casting for taking out step (5) is rinsed then with being dried with nitrogen with high-temperature vapor, high temperature
Steam temperature is 280-300 DEG C, and then then naturally dry is packed to get finished product.
Embodiment 3
(1) by by 6 parts of cobalt chloride, 8 parts of manganese oxide, 4 parts of nickel oxide combination magnetic material mixtures and by magnesia 4
Part, 5 parts of boron carbide, 7 parts of aluminium oxide, 2 parts of copper oxide, 3 parts of spinelle, 3 parts of the diatomite non-magnetic mixtures formed point
Not Hun Hejunyun, be separately added into wet ball mill and grind 20 hours, obtained Magnaglo and nonmagnetic powder mixture point
It Guo Shai not sort, it is 98:1 that wherein the parameter of wet ball-milling, which is ratio of grinding media to material, and ball-milling medium is ethylene glycol, 1500 turns of rotational speed of ball-mill/
Minute；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are carried out at freeze-drying respectively
Reason, obtained magnetic product and non magnetic product are saved backup in -80 DEG C, wherein freeze-drying parameter is -30 DEG C of cryogenic temperature,
Freeze pressure 25Pa, cooling time 2 hours；
(3) by 2- amino -8 parts of terephthalic acid (TPA), 6 parts of methanol, 5 parts of acrylonitrile, 2 parts of toluene, 5 parts of dimethyl sulfoxide, ring
4 parts of alkanoic acid zinc, mixing is added in electric arc furnaces, carrying out melting reaction, and temperature is increased to 200 DEG C, and insulation reaction 70 minutes, from
Magnetic product and non magnetic product in step (2) are added after being so cooled to 150 DEG C or less, is warming up to 220- after mixing evenly
225 DEG C, while vacuumizing in electric arc furnaces, vacuum pressure is 50Pa hereinafter, sustained response 4 hours, is then cooled to 80-85 DEG C,
Heat preservation 32 hours, it is spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3), wherein double spiral shells
Bar extruder parameter is that extruder temperature is 240 DEG C, and screw speed is 500 revs/min；
(5) liquid nitrogen is sprayed to the casting of step (4) in freezing chamber, makes its rapid cooling, is then freezed in freezing chamber
Solidification 8 hours；
(6) then the freezing casting for taking out step (5) is rinsed then with being dried with nitrogen with high-temperature vapor, high temperature
Steam temperature is 280-300 DEG C, and then then naturally dry is packed to get finished product.
Embodiment 4
(1) by by 7 parts of cobalt chloride, 9 parts of manganese oxide, 5 parts of nickel oxide combination magnetic material mixtures and by magnesia 5
Part, 6 parts of boron carbide, 8 parts of aluminium oxide, 3 parts of copper oxide, 3 parts of spinelle, 4 parts of the diatomite non-magnetic mixtures formed point
Not Hun Hejunyun, be separately added into wet ball mill and grind 24 hours, obtained Magnaglo and nonmagnetic powder mixture point
It Guo Shai not sort, it is 98:1 that wherein the parameter of wet ball-milling, which is ratio of grinding media to material, and ball-milling medium is ethylene glycol, 1500 turns of rotational speed of ball-mill/
Minute；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are carried out at freeze-drying respectively
Reason, obtained magnetic product and non magnetic product are saved backup in -80 DEG C, wherein freeze-drying parameter is -30 DEG C of cryogenic temperature,
Freeze pressure 25Pa, cooling time 2 hours；
(3) by 2- amino -9 parts of terephthalic acid (TPA), 7 parts of methanol, 6 parts of acrylonitrile, 2 parts of toluene, 6 parts of dimethyl sulfoxide, two
5 parts of dibutyl tin laurate, mixing is added to electric arc furnaces, carries out melting reaction, and temperature is increased to 200 DEG C, insulation reaction 90
Minute, magnetic product and non magnetic product in step (2) are added after being naturally cooling to 150 DEG C or less, heats up after mixing evenly
It is vacuumized to 220-225 DEG C, while in electric arc furnaces, vacuum pressure is 50Pa hereinafter, sustained response 5 hours, is then cooled to 80-
85 DEG C, 36 hours are kept the temperature, it is spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3), wherein double spiral shells
Bar extruder parameter is that extruder temperature is 260 DEG C, and screw speed is 500 revs/min；
(5) liquid nitrogen is sprayed to the casting of step (4) in freezing chamber, makes its rapid cooling, is then freezed in freezing chamber
Solidification 10 hours；
(6) then the freezing casting for taking out step (5) is rinsed then with being dried with nitrogen with high-temperature vapor, high temperature
Steam temperature is 280-300 DEG C, and then then naturally dry is packed to get finished product.
Comparative example 1
(1) by by 3 parts of cobalt chloride, 5 parts of manganese oxide, 2 parts of nickel oxide combination magnetic material mixtures and by magnesia 1
Part, 2 parts of boron carbide, 3 parts of aluminium oxide, 1 part of copper oxide, 1 part of spinelle, 2 parts of the diatomite non-magnetic mixtures formed point
Not Hun Hejunyun, be separately added into wet ball mill and grind 10 hours, obtained Magnaglo and nonmagnetic powder mixture point
It Guo Shai not sort, it is 98:1 that wherein the parameter of wet ball-milling, which is ratio of grinding media to material, and ball-milling medium is ethylene glycol, 1500 turns of rotational speed of ball-mill/
Minute；
(2) by 2- amino -3 parts of terephthalic acid (TPA), 2 parts of methanol, 3 parts of acrylonitrile, 1 part of toluene, 3 parts of dimethyl sulfoxide, 2-
2 parts of cadmium ethylhexoate, mixing is added to electric arc furnaces, carries out melting reaction, and temperature is increased to 200 DEG C, and insulation reaction 30 is divided
Clock is added magnetic product and non magnetic product in step (1), is warming up to after mixing evenly after being naturally cooling to 150 DEG C or less
220-225 DEG C, while vacuumizing in electric arc furnaces, vacuum pressure is 50Pa hereinafter, sustained response 2 hours, is then cooled to 80-85
DEG C, 24 hours are kept the temperature, it is spare；
(3) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (2), wherein double spiral shells
Bar extruder parameter is that extruder temperature is 220 DEG C, and screw speed is 500 revs/min；
(4) liquid nitrogen is sprayed to the casting of step (3) in freezing chamber, makes its rapid cooling, is then freezed in freezing chamber
Solidification 5 hours；
(5) then the freezing casting for taking out step (4) is rinsed then with being dried with nitrogen with high-temperature vapor, high temperature
Steam temperature is 280-300 DEG C, and then then naturally dry is packed to get finished product.
Comparative example 2
(1) by by 7 parts of cobalt chloride, 9 parts of manganese oxide, 5 parts of nickel oxide combination magnetic material mixtures and by magnesia 5
Part, 6 parts of boron carbide, 8 parts of aluminium oxide, 3 parts of copper oxide, 3 parts of spinelle, 4 parts of the diatomite non-magnetic mixtures formed point
Not Hun Hejunyun, be separately added into wet ball mill and grind 24 hours, obtained Magnaglo and nonmagnetic powder mixture point
It Guo Shai not sort, it is 98:1 that wherein the parameter of wet ball-milling, which is ratio of grinding media to material, and ball-milling medium is ethylene glycol, 1500 turns of rotational speed of ball-mill/
Minute；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are carried out at freeze-drying respectively
Reason, obtained magnetic product and non magnetic product are saved backup in -80 DEG C, wherein freeze-drying parameter is -30 DEG C of cryogenic temperature,
Freeze pressure 25Pa, cooling time 2 hours；
(3) by 2- amino -9 parts of terephthalic acid (TPA), 7 parts of methanol, 6 parts of acrylonitrile, 2 parts of toluene, 6 parts of dimethyl sulfoxide, two
5 parts of dibutyl tin laurate, mixing is added to electric arc furnaces, carries out melting reaction, and temperature is increased to 200 DEG C, insulation reaction 90
Minute, magnetic product and non magnetic product in step (2) are added after being naturally cooling to 150 DEG C or less, heats up after mixing evenly
It is vacuumized to 220-225 DEG C, while in electric arc furnaces, vacuum pressure is 50Pa hereinafter, sustained response 5 hours, is then cooled to 80-
85 DEG C, 36 hours are kept the temperature, it is spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3), wherein double spiral shells
Bar extruder parameter is that extruder temperature is 260 DEG C, and screw speed is 500 revs/min；
(5) by the casting of step (4) at room temperature spontaneous curing 10 hours；
(6) it to the casting of step (5), then with being dried with nitrogen, is then rinsed with high-temperature vapor, high-temperature vapor
Temperature is 280-300 DEG C, and then then naturally dry is packed to get finished product.
The electromagnetic shielding obtained of embodiment 1-4 and comparative example 1-2 is carried out with magnetic material to magnetic flux density, initial respectively
This several magnetic conductivity, maximum operating temperature performance tests, test result are shown in Table 1.
Table 1
The magnetism that the preparation method of electromagnetic shielding magnetic material of the invention combines cobalt chloride, manganese oxide, nickel oxide
The non-magnetic material that material and magnesia, boron carbide, aluminium oxide, copper oxide, spinelle, diatomite form passes through wet process ball respectively
2- amino-terephthalic acid (TPA), methanol, acrylonitrile, toluene, dimethyl sulfoxide, stabilizer are added after mill and freeze-drying process
Then the raw materials such as reaction are blown by gradient smelting, twin-screw extrusion, mold, liquid nitrogen rapid cooling, freezing solidification, nitrogen respectively
Dry, high-temperature vapor washing, naturally dry and etc. electromagnetic shielding magnetic material is prepared.The electromagnetic shielding being prepared
With magnetic material, long service life, electromagnetic performance is good, can satisfy a variety of demands in industry.Electromagnetic shielding of the invention
It is easy to get with magnetic material raw material, simple process, is suitable for heavy industrialization and uses, it is practical.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (7)
1. the preparation method that a kind of electromagnetic shielding uses magnetic material, which comprises the following steps:
(1) by by 3-7 parts of cobalt chloride, 5-9 parts of manganese oxide, 2-5 parts of nickel oxide combination magnetic material mixtures and by magnesia
1-5 parts, 2-6 parts of boron carbide, 3-8 parts of aluminium oxide, 1-3 parts of copper oxide, 1-3 parts of spinelle, 2-4 parts of diatomite composition it is non magnetic
Material blends are uniformly mixed respectively, are separately added into wet ball mill and are ground 10-24 hours, obtained Magnaglo and non-magnetic
Property mixture of powders is sieved sorting respectively；
(2) Magnaglo mixture and nonmagnetic powder mixture that step (1) obtains are subjected to freeze-drying process respectively, obtained
To magnetic product and non magnetic product save backup in -80 DEG C；
(3) by 2- amino -3-9 parts of terephthalic acid (TPA), 2-7 parts of methanol, 3-6 parts of acrylonitrile, 1-2 parts of toluene, dimethyl sulfoxide 3-6
Part, 2-5 parts of stabilizer, mixing are added to electric arc furnaces, carry out melting reaction, and temperature is increased to 200 DEG C, insulation reaction 30-90
Minute, magnetic product and non magnetic product in step (2) are added after being naturally cooling to 150 DEG C or less, heats up after mixing evenly
It is vacuumized to 220-225 DEG C, while in electric arc furnaces, sustained response 2-5 hours, is then cooled to 80-85 DEG C, heat preservation 24-36 is small
When, it is spare；
(4) it will be melted, squeezed out to mold in the product injection parallel double-screw extruder of step (3)；
(5) liquid nitrogen is sprayed to the casting of step (4) in freezing chamber, makes its rapid cooling, solidification is then freezed in freezing chamber
5-10 hours；
(6) then the freezing casting for taking out step (5) is rinsed, naturally dry then with being dried with nitrogen with high-temperature vapor
Then it packs to get finished product.
2. the preparation method that a kind of electromagnetic shielding according to claim 1 uses magnetic material, which is characterized in that the step
(1) it is 98:1 that the parameter of wet ball-milling, which is ratio of grinding media to material, in, and ball-milling medium is ethylene glycol, 1500 revs/min of rotational speed of ball-mill.
3. the preparation method that a kind of electromagnetic shielding according to claim 1 uses magnetic material, which is characterized in that the step
(2) in freeze-drying parameter be -30 DEG C of cryogenic temperature, freeze pressure 25Pa, cooling time 2 hours.
4. the preparation method that a kind of electromagnetic shielding according to claim 1 uses magnetic material, which is characterized in that the step
(3) stabilizer in is selected from one of cadmium 2-ethylhexoate, barium laurate, zinc naphthenate, dibutyl tin dilaurate or several
Kind.
5. the preparation method that a kind of electromagnetic shielding according to claim 1 uses magnetic material, which is characterized in that the step
(3) vacuum pressure in is 50Pa or less.
6. the preparation method that a kind of electromagnetic shielding according to claim 1 uses magnetic material, which is characterized in that the step
(4) it is 220-260 DEG C that the double screw extruder parameter in, which is extruder temperature, and screw speed is 500 revs/min.
7. the preparation method that a kind of electromagnetic shielding according to claim 1 uses magnetic material, which is characterized in that the step
(6) the high-temperature vapor temperature in is 280-300 DEG C.
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| CN201810769676.5A CN108962521A (en) | 2018-07-13 | 2018-07-13 | A kind of electromagnetic shielding preparation method of magnetic material |
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| CN201810769676.5A CN108962521A (en) | 2018-07-13 | 2018-07-13 | A kind of electromagnetic shielding preparation method of magnetic material |
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| CN110718347A (en) * | 2019-10-28 | 2020-01-21 | 横店集团东磁股份有限公司 | Preparation method of high-permeability scaly iron-silicon-aluminum magnetic powder |
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| CN110718347A (en) * | 2019-10-28 | 2020-01-21 | 横店集团东磁股份有限公司 | Preparation method of high-permeability scaly iron-silicon-aluminum magnetic powder |
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