CN1658748A - Manufacturing method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer - Google Patents
Manufacturing method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer Download PDFInfo
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- CN1658748A CN1658748A CN 200510032781 CN200510032781A CN1658748A CN 1658748 A CN1658748 A CN 1658748A CN 200510032781 CN200510032781 CN 200510032781 CN 200510032781 A CN200510032781 A CN 200510032781A CN 1658748 A CN1658748 A CN 1658748A
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Abstract
This invention is a producing method of the nanometer crystal floppy magnetism alloy powder polymer mulriple electromagnetism shield body. The method adopt the technology of melting body fast curdling to produce the Fe-B-Si-Nb-Cu or the Fe-Si-Al serial of alloy squamas, and stave them to obtain the floppy magnetism alloy particulates, then anneal in vacuum; use the vacuum vaporing and plating technology to deposit a layer of polymeric opposite two methylic benzene membrane on the surface of the magnetic powders; add the magnetic powders into the polymeric monomer solution to produce the suspending system; use the pressed pieces to extrude a pressed and extended technics to produce the mentioned nanometer crystal floppy magnetism alloy powder polymer mulriple electromagnetism shield body. The technics of this invention is simple, its cost is low, the anticorrosive produced magnet has very high chemistry stability, and the magnet shield effect is improved.
Description
Technical field
The present invention relates to anti-electromagnetic interference material preparation and magnet forming processing technology field, specifically be meant a kind of preparation method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer.
Background technology
Along with fast development of information technology, particularly mobile communication, computer, household electrical appliance etc. is universal rapidly, and electronic product has been widely used in the daily production of people, various fields in life.In order to reduce equipment volume, improve equipment performance simultaneously, the operating frequency of various electronic equipments is more and more higher.With the personal computer is example, and the clock frequency of CPU has reached more than the 4GHz, and the operating frequency of other many personal electronic equipments is also mostly at the quasi-microwave wave band.Extensively popularizing when bringing convenience to people's life of electronic equipment also brought disadvantageous Electromagnetic Interference problem.Electromagnetic Interference (EMI) or be electromagnetic noise is to follow development of electronic technology, especially the popularization and application of digital circuit, mobile communication and Switching Power Supply and a kind of invisible pollution that can't feel with sense organ of producing.Owing to electromagnetic interference (EMI) cause the misoperation of electronic instrument in addition the example that breaks down of common occurrence, nearly all information system all exists EMI and anti-EMI problem in varying degrees.It is said that the use owing to mobile phone in hospital causes the incidence of medical electronic apparatus misoperation to reach more than 66%.The electromagnetic wave of electronic equipment radiation, leakage not only can cause serious interference to electronic equipment itself, and is threatening human beings'health and safety.Show according to interrelated data, electromagnetic radiation has become one of etiology of current harm humans health, live in the leukemic probability of crowd in the above electromagnetic wave of the 2 milligauss magnetic field and be normal population 2.93 times, the probability of suffering from muscle tumor is 326 times of normal population.The EMI that how to suppress even eliminate electronic equipment has become global electronic industry question of common concern.
Electromagnetic interference signal mainly arrives receiver by conduction (inside of circuit or system connects, the bonding conductor between interference source and the receiver), radiation and induction mode.Common interference source and frequency range mainly comprise computer (10M～100MHz), TV, FM broadcasting, very high frequency(VHF) communication (100M～1GHz), microwave, aircraft radar (1G～10GHz).Under many situations, interference signal is a broadband signal.Anti-electromagnetic interference technology mainly comprises filtering, shielding, ground connection three major types, and wherein filtering technique is the method for utilizing at the porch of electric equipment grafting anti-emi filter, reaches the effect of inhibition by the electromagnetic interference of power line conduction.Electromagnetic shielding mainly be the restriction electromagnetic energy from a side space of shielding material to the transmission in opposite side space.Electromagnetic wave propagation has 3 kinds of different mechanism to decay to shielding material when surface usually: the one, and the reflection loss on the shield surface; The 2nd, decayed by absorbed after entering shield; The 3rd, the multiple attenuation in shield inside.In general, what electrical shielding material was decayed is the electric field of high impedance, and shielding action is mainly determined by surface reflection.And the decay of magnetic shield mainly is to be determined by attenuation by absorption.According to formula: A (dB)=1.314d (f μ
fσ
f)
1/2, wherein d is the thickness (cm) of screen, f is a wave frequency, σ
fBe the conductivity of shielding material with respect to copper, μ
fRelative permeability for shielding material.Well behaved electromagnetic shielding material should have higher conductivity and magnetic permeability.Electromagnetic shielding material mainly comprises top layer conductivity type shielding material (comprising electrically-conducting paint and metal backing shielding material) and fills compound shielding material, the latter is made up of synthetic resin and the filler with good conductive magnetic waveguide performance, makes through methods such as injection or extrusion moldings.
Electrically-conducting paint is the electromagnetic shielding material that is applied to electronic instrument the earliest, promptly bring into use silver the sixties 20th century of US military is electrically-conducting paint, current use mainly be that nickel system and copper are electrically-conducting paint, silver be coating owing to costing an arm and a leg, can only be applicable to some special occasions.Conventional method is that the ABS plastic with tool housing carries out carrying out plated film on its surface, earlier plating one deck Cu after the alligatoring preliminary treatment; utilize its high conductivity to make shielding usefulness; because the easy oxidized corrosion of Cu, must be on its surface the outer layer of Ni of plating, be used for anti-oxidation protection.The shielding material that this method obtains can reach the FCC of the U.S. and the VDE standard of West Germany usually.If be covered with one deck electromagnetic wave absorbent material again,, thereby strengthen the effect of anti-electromagnetic interference with the electromagnetic wave that reduces greatly to reflect in instrument internal through reflecting barrier.
Electromagnetic wave absorbing layer adopts various absorbing materials to make rigidity or flexible absorbing material thin slice or plate usually.By contrast, flexible suction wave plate more can adapt to the instructions for use under various complex instrument equipment and the various condition of work, thereby become the development priority of absorbing material because freedom shape is big.Present widely used absorbing material generally is to have dielectric loss, and the magnetic material that has magnetic loss again comprises two kinds of ferrite soft magnetic and soft magnetic metals.The Ni series ferrite material of spinel-type has been widely used in the wave absorber of anechoic chamber as 30M～1GHz, and in ghz band, this type of ferritic magnetic permeability sharply descends, and can only be operated in below the 5.6GHz (the Snock limit).The anti-electromagnetic interference material of higher frequency adopts the Ferrite Material of hexaplanar usually.Because volume is too big during the clutter of use ferrite wave-absorbing material absorption quasi-microwave frequency range, frequency band is wide inadequately and be difficult to make complicated shape etc., adds the restriction of its weight, volume etc., has used very big limitation.
Compare with ferrite magnetic material, the saturation magnetization of metallicl magnetic material is its 2～3 times, has the anti-emi characteristics of more excellent performance than ferrite magnetic material in ghz band.If be about skin depth and have between the sheet metal Magnaglo of big aspect ratio and isolate with polymer at thickness, form the laminated composite material that is similar to magnetic thin film-thin dielectric film alternate laminated structure, can effectively absorb electromagnetic wave.This composite wave-suction material of being made by sheet magnetic alloy micro mist and polymeric material demonstrates desirable applicability in very wide frequency range on the one hand, demonstrates the quick and facility in the use on the other hand.Usually only need on needs carry out the device of electromagnetic shielding or twine or cover this composite wave-suction material around it, can reach the anti-electromagnetic interference of expection and the effect of anti-electromagnetic exposure.
The disclosed so far preparation method who makes composite wave-suction material by magnetically soft alloy micro mist and polymeric material comprises and followingly planting in several: first kind is to make after the amorphous alloy of fragmentation and the polymer mixed; Second kind is that the sheet particulate of sneaking into alloys such as Fe-Ni, Fe-Ni-Mo, Fe-Si-Al, Fe-Ni-Co in polymer is made; The third is to adopt Cr-Si-Al-Fe alloy sheet particulate and rubber or plastics to make the sheet magnetic shielding part; The 4th kind be with high polymer with make after the flat metal magnetic of high magnetic permeability mixes; The 5th kind is to adopt Wet technique that flat soft magnetic powder and haloflex are mixed and made into film, and the rolling mill of the flexible roll of apparatus is pressed into magnetic sheet; The 6th kind is to adopt the flat soft magnetic powder of Fe-Si-Al-Ni, Fe-Si-Al to mix with firm silicone rubber after roll and make the sheet magnet; The 7th kind is that the employing specific area is 0.1～3m
2The flat soft magnetic powder of the Fe-Si-Al-Ni of/g, Fe-Si-Al with make the sheet magnet after haloflex mixes.
There is following deficiency in prior art: the flat soft-magnetic alloy powder preparation difficulty that use (1): a kind of method is to obtain by the amorphous alloy band is broken, owing to need to obtain earlier amorphous alloy band, complicated process of preparation, cost height; Another kind method is earlier to produce spherical metal powder with atomization, makes spherical powder obtain flat form by the sand mill sand milling again, and the technology of this preparation sheet alloy powder requires highly to equipment, and technique controlling difficulty is very big.(2) the magnetically soft alloy micro mist of Shi Yonging mainly comprises iron-based non-crystalline Fe-Si-Al-Ni, Fe-Si-Al, Cr-Si-Al-Fe, Fe-Ni, Fe-Ni-Mo, Fe-Si-Al, Fe-Ni-Co series alloy, does not have best comprehensive magnetic property.(3) prior art only is related to and improves metal magnetic and add suitable coupling agent with the combining effect of polymer, soft-magnetic alloy powder is not carried out anti-corrosion treatment, and the anticorrosion of metal magnetic and oxidation resistance directly influence the stability of composite wave-suction material performance.(4) carry out processing and forming after prior art all adopts the magnetically soft alloy particulate and polymer directly mixes, because the difference of alloy magnetic powder and polymer proportion, in order to make two kinds of material mixing even, must carry out Forced Mixing, often introduce big stress in the mixed process, the shield effectiveness of magnet is reduced.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, and a kind of preparation method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer is provided.This method technology is simple, with low cost, adopts Fe-B-Si-Nb-Cu or Fe-Si-Al iron based nano crystal soft magnetic powder with best comprehensive magnetic property, and the magnet of anticorrosion preparation has high chemical stability, and the magnet shield effectiveness improves greatly.
The present invention is achieved through the following technical solutions: the preparation method of described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer comprises the steps and process conditions:
The first step, adopting the melt flash set technology to make thickness is 10～40 microns Fe-B-Si-Nb-Cu or Fe-Si-Al series alloy scale, with the broken granularity that obtains of fast quenching scale is 25～140 microns magnetically soft alloy particulate, micro mist was carried out vacuum annealing 30～120 minutes under 450～600 ℃ of temperature, the crystallite dimension of control magnetically soft alloy micro mist is in 10～40 nanometers;
Second step, adopt vacuum evaporation technology at magnetic surface deposition one deck parylene film, insulated and stabilization processes in the magnetic surface;
The 3rd step added magnetic in the polymer monomer solution, made stable suspension system, made monomer on the soft-magnetic alloy powder surface home position polymerization reaction take place and generated polymer, realized that soft-magnetic alloy powder mixes with the even of polymer;
The 4th step, adopt compressing tablet, extrude-calendering technology prepares described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer.
In order to realize the present invention better, in the described melt flash set technology, chill roll surface linear speed 10～40 meter per seconds, working chamber's forvacuum charges into high-purity argon gas then; Adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale; The ring disome (C16H16) that described second step is the employing paraxylene is warming up to 650～700 ℃ in a vacuum makes its cracking, adopt the mode of cold air circulation to make magnetically soft alloy micro mist temperature be lower than 30 ℃, the pyrolysis product of ring disome that makes paraxylene is at the micro mist surface aggregation and polymerization takes place, and forms parylene film; Described polymer monomer comprises methyl-prop diluted acid hydroxyl ethyl ester, caprolactam, styrene, methyl methacrylate, acrylic acid butyl ester, methyl methacrylate ethylene oxidic ester.
Described the 3rd step comprises: (1) adds mass percent in deionized water be 5～30% methyl-prop diluted acid hydroxyl ethyl ester (HEMA), 0～20% water-soluble high-molecular material, 3～20% dispersant, 0.15～2% initator, makes monomer solution; (2) be that 80～95% soft-magnetic alloy powder adds in the monomer solution with mass percent, make suspension system; (3) suspension system is heated to 60～70 ℃ in nitrogen, is incubated 2～8 hours, home position polymerization reaction takes place on the magnetic surface and generates poly-methyl-prop diluted acid hydroxyl ethyl ester in methyl-prop diluted acid hydroxyl ethyl ester.
Described the 3rd step comprises: (1) becomes liquid with the caprolactam monomer heat fused, and the adding mass percent concentration is 2～5% 6-ACA 6-aminocaproic acid (H
2N (CH
2)
5COOH), make caprolactam monomer solution; (2) adding mass percent in the caprolactam monomer liquation is 80～95% soft-magnetic alloy powder, makes suspension system; (3) suspension system is heated to 180～250 ℃, is incubated 5～10 hours, make caprolactam monomer generate nylon-6 in the polymerization of soft-magnetic alloy powder surface in situ.
Described the 3rd step comprises: (1) adds mass percent in styrene (PS) be 5～10% azo two isobutyls fine (AIBN); (2) soft-magnetic alloy powder of adding mass percent 80～95% in the styrene liquation makes suspension system; (3) suspension system is heated to 65～80 ℃ in nitrogen, is incubated 5～8 hours, make styrene monomer generate polystyrene in the polymerization of soft-magnetic alloy powder surface in situ.
Described the 3rd step comprises: (1) adds mass percent in methyl methacrylate be 5～10% diphenyl peroxide acetyl (BPO); (2) soft-magnetic alloy powder of adding mass percent 80～95% in the methyl methacrylate monomer liquation makes suspension system; (3) suspension system is heated to 80～100 ℃ in nitrogen, is incubated 6～10 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the soft-magnetic alloy powder surface.
Described the 3rd step comprises: (1) adds mass percent in the acrylic acid butyl ester be 5～10% azo two isobutyls fine (AIBN); (2) soft-magnetic alloy powder of adding mass percent 80～95% in acrylic acid butyl ester liquation makes suspension system; (3) suspension system is heated to 65～80 ℃ in nitrogen, is incubated 4～6 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of soft-magnetic alloy powder surface in situ.
Described the 3rd step comprises: (1) adds mass percent in the methyl methacrylate glycidyl ester monomer be 5～10% diphenyl peroxide acetyl (BPO); (2) soft-magnetic alloy powder of adding mass percent 80～95% in methyl methacrylate glycidyl ester monomer liquation makes suspension system; (3) suspension system is heated to 80～100 ℃ in nitrogen, is incubated 5～7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the soft-magnetic alloy powder surface.
In the present invention, utilize the Fe-B-Si-Nb-Cu alloy of melt flash set technology preparation and Fe-Si-Al alloy powder when the preparation attitude, all to form, but along with the quench increase of speed of liquid, non-crystallization degree strengthen gradually by amorphous and nanocrystalline line and staff control.For obtaining required soft magnet performance, the fast quenching magnetic need be annealed and be improved alloy structure and remove stress.The heat treatment temperature that the present invention selects is 450～600 ℃, 30～120 minutes processing times.The grain size of magnetic utilizes the subsidiary software of Philips X ' PertX x ray diffractometer x to measure calculating.This software is theoretical foundation with the Scherer formula, that is:
W wherein
Size=w
b-w
s, w
Size---thin brilliant broadening, w
b---measure the peak shape width, w
s---standard peak shape width, K---form factor, λ---incident ray wavelength.
Adopt the copper rake in the experiment, wavelength X is 0.154439 (through the curve of K-Alpha2), and form factor K gets 0.9.Rapid solidification Fe-B-Si-Nb-Cu alloy and Fe-Si-Al alloy are through the big or small D=6～20nm of α-Fe (Si) crystal grain of 450～600 ℃ of annealing after 1 hour.
In the present invention, parylene film is a kind of tough and tensile, transparent, polymeric membrane that self lubricity and high uniformity are arranged, has excellent electrical insulation capability, and adverse circumstances such as salt fog, mould, cargo sweat are had good barrier propterty.
The present invention compared with prior art has following advantage and beneficial effect:
1, the present invention utilizes flash set technology in conjunction with crushing and screening prepared sheet iron-base nanometer crystal alloy soft magnetic granules, can control the geometric shape of metal magnetic by the method for adjusting rapid quenching technique parameter and milling process parameter, compare with the magnetically soft alloy magnetic flattening technology that adopts usually at present, technical difficulty is little, technology is simple, with low cost, and the nanometer crystal alloy magnetic that is adopted has best comprehensive magnetic property, can improve the anti-electromagnetic interference performance of composite shielding material.
2, the present invention utilizes vacuum evaporation technology at the coated parylene film in magnetic surface, can make metal magnetic and external environment isolated fully, makes soft magnetic powder have extremely strong anticorrosion and oxidation resistance, thereby fully guarantees the stable of built-up magnet performance.Parylene has excellent electrical insulation capability, and adverse circumstances such as salt fog, humidity, corrosivity are had good isolating and protecting function, is five-star in the world at present protective coating.Because Parylene is on the surface of different shape, all can form the ideal uniform overlay comprise in sharp-pointed corner angle, the crack and inner surface etc., thereby be particularly suitable for the surface insulation and protection coating of sheet metal magnetic.
3, the present invention utilizes metal magnetic to mix back home position polymerization reaction technology with polymer monomer, and the polymer as binding agent is generated at the magnetic surface in situ.Because the proportion deviation of metal magnetic and polymer is big, is very difficult to mix, thereby influences the uniformity of the microstructure and property of flexible magnet after the moulding.Utilize monomer home position polymerization reaction technology can make the surface of every metal magnetic coated equably polymeric layer, magnetic was evenly mixed with polymer as binding agent, sneak out the damage of journey by force in the time of can avoiding again adopting polymer directly to mix, improve the performance of built-up magnet magnetic with magnetic.
Embodiment
Below in conjunction with embodiment, the present invention is done detailed description further.
Embodiment one
The first step, with 82.5 parts of pure iron, 1.5 parts of copper, 5.5 parts of niobiums, 9 parts of silicon and 1.5 parts of boron as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 40 meter per seconds, smelting temperature is controlled at 1500 ℃, feeding speed 100 Grams Per Minutes, and the working chamber takes out 5 * 10 in advance
-3The handkerchief vacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-B-Si-Nb-Cu alloy scale of 10 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 25～30 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 120 minutes under 500 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, adopt the resistance heating mode that the ring disome (C16H16) of the paraxylene that exists with solid-state form under the normal temperature is heated to 130 ℃, make it evaporation and become gas, again in vacuum 650 ℃ it is cracked into the monomer of ring disome, the monomer deposition after the cracking is lower than the surface aggregate formation parylene film of the soft-magnetic alloy powder of 30 ℃ (adopt cold air circulation modes) to temperature;
In the 3rd step, adding mass percent in deionized water is 10% methyl-prop diluted acid hydroxyl ethyl ester (HEMA), 5% dispersant Duramax
TMD-3005,0.15% Ammonium Persulfate 98.5 fully mix, and make monomer solution; With percentage by weight is 90% add in the monomer solution through the coated soft-magnetic alloy powder of Parylene, fully mixes, and makes stable suspension system; Suspension system is heated to 70 ℃ in nitrogen, is incubated 3 hours, make methyl-prop diluted acid hydroxyl ethyl ester home position polymerization reaction take place and generate poly-methyl-prop diluted acid hydroxyl ethyl ester, temperature is risen to 100 ℃ subsequently, be incubated 5 hours, dehydration, drying, granulation on the magnetic surface;
The 4th step, utilize compressing tablet, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-poly-methyl-prop diluted acid hydroxyl ethyl ester built-up magnet.
Embodiment two
The first step, with 75 parts of pure iron, 1 part of copper, 6 parts of niobiums, 15 parts of silicon and 3 parts of boron are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 32 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-B-Si-Nb-Cu alloy scale of 18 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 50～75 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 60 minutes under 550 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 20 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 700 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
The 3rd step was heated to 150 ℃ with caprolactam monomer and is fused into liquid, added the 6-ACA 6-aminocaproic acid (H of mass percent 3%
2N (CH
2)
5COOH) and fully stir, mix, make caprolactam monomer solution; In the caprolactam monomer liquation, add mass percent 80% through the coated soft-magnetic alloy powder of Parylene, and stir, make mixed system; Mixed system is heated to 180 ℃, is incubated 1 hour, and then is heated to 250 ℃, be incubated 6 hours, make caprolactam monomer generate nylon-6 in the polymerization of soft-magnetic alloy powder surface in situ; Mixture after reaction finished carries out the tie rod pelletizing with twin-screw (single screw rod) extruder, obtains the soft-magnetic alloy powder particle of the even coated nylon-6 in surface;
The 4th step, utilize compressing tablet, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-nylon built-up magnet.
Embodiment three
The first step, with 85 parts of pure iron, 1 part of niobium, 12.5 part silicon and 1.5 parts of boron are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 25 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-B-Si-Nb alloy scale of 25 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 80～100 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 30 minutes under 600 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 30 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 700 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
In the 3rd step, the adding mass percent is 8% azo two isobutyls fine (AIBN) and fully stirs in styrene, mixes; In the styrene liquation, add mass percent 95% through the coated soft-magnetic alloy powder of Parylene, and stir, make mixed system; Mixed system is heated to 70 ℃ in nitrogen, is incubated 6 hours, make styrene monomer generate polystyrene in the polymerization of soft-magnetic alloy powder surface in situ;
The 4th step, utilize compressing tablet at 190 ℃, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-polystyrene built-up magnet.
Embodiment four
The first step, with 90 parts of pure iron, 2 parts of copper, 2.5 part niobium, 5 parts of silicon and 1 part of boron are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 18 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-B-Si-Nb-Cu alloy scale of 30 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 90～120 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 60 minutes under 450 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 40 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 700 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
In the 3rd step, the adding mass percent is 5% diphenyl peroxide acetyl (BPO) and fully stirs in methyl methacrylate, mixes; In the methyl methacrylate monomer liquation, add mass percent 85% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Suspension system is heated to 90 ℃ in nitrogen, is incubated 8 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the soft-magnetic alloy powder surface;
The 4th step, utilize compressing tablet at 190 ℃, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-polymethyl methacrylate built-up magnet.
Embodiment five
The first step, with 84 parts of pure iron, 10 parts of silicon and 6 parts of aluminium are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 15 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-Si-Al alloy scale of 40 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 125～140 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 30 minutes under 500 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 700 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
In the 3rd step, the adding mass percent is 10% azo two isobutyls fine (AIBN) and fully stirs in the acrylic acid butyl ester, mixes; In acrylic acid butyl ester liquation, add mass percent 80% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Suspension system is heated to 75 ℃ in nitrogen, is incubated 5 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of soft-magnetic alloy powder surface in situ;
The 4th step, utilize compressing tablet at 120 ℃, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-polypropylene acid butyl ester built-up magnet.
Embodiment six
The first step, with 86 parts of pure iron, 9 parts of silicon and 5 parts of aluminium are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 40 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-Si-Al alloy scale of 10 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, obtaining granularity by screening then is 25～40 microns magnetically soft alloy particulate, micro mist was carried out vacuum annealing 60 minutes under 450 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 650 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
In the 3rd step, the adding mass percent is 5% diphenyl peroxide acetyl (BPO) in the methyl methacrylate glycidyl ester monomer, and stirs; In methyl methacrylate glycidyl ester monomer liquation, add to add mass percent 85% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Mixed system is heated to 100 ℃ in nitrogen, is incubated 7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the soft-magnetic alloy powder surface;
The 4th step, utilize compressing tablet at 130 ℃, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-polymethyl methacrylate ethylene oxidic ester built-up magnet.
Embodiment seven
The first step, with 70 parts of pure iron, 5 parts of copper, 20 parts of silicon and 5 parts of boron as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 10 meter per seconds, smelting temperature is controlled at 1500 ℃, feeding speed 100 Grams Per Minutes, and the working chamber takes out 5 * 10 in advance
-3The handkerchief vacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-B-Si-Cu alloy scale of 10 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 25～30 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 120 minutes under 500 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, adopt the resistance heating mode that the ring disome (C16H16) of the paraxylene that exists with solid-state form under the normal temperature is heated to 130 ℃, make it evaporation and become gas, again in vacuum 650 ℃ it is cracked into the monomer of ring disome, the monomer deposition after the cracking is lower than the surface aggregate formation parylene film of the soft-magnetic alloy powder of 30 ℃ (adopt cold air circulation modes) to temperature;
In the 3rd step, the adding mass percent is 5% methyl-prop diluted acid hydroxyl ethyl ester (HEMA), 10% water-soluble high-molecular material PEO, 3% dispersant Duramax in deionized water
TMD-3005,1% Ammonium Persulfate 98.5 fully mix, and make monomer solution; With percentage by weight is 90% add in the monomer solution through the coated soft-magnetic alloy powder of Parylene, fully mixes, and makes stable suspension system; Suspension system is heated to 60 ℃ in nitrogen, is incubated 2 hours, make methyl-prop diluted acid hydroxyl ethyl ester home position polymerization reaction take place and generate poly-methyl-prop diluted acid hydroxyl ethyl ester, dehydration, drying, granulation on the magnetic surface;
The 4th step, utilize compressing tablet, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-poly-methyl-prop diluted acid hydroxyl ethyl ester built-up magnet.
Embodiment eight
The first step, with 70 parts of pure iron, 5 parts of copper, 10 parts of niobiums, 20 parts of silicon and 5 parts of boron as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 10 meter per seconds, smelting temperature is controlled at 1500 ℃, feeding speed 100 Grams Per Minutes, and the working chamber takes out 5 * 10 in advance
-3The handkerchief vacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-B-Si-Nb-Cu alloy scale of 10 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 25～30 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 120 minutes under 500 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, adopt the resistance heating mode that the ring disome (C16H16) of the paraxylene that exists with solid-state form under the normal temperature is heated to 130 ℃, make it evaporation and become gas, again in vacuum 650 ℃ it is cracked into the monomer of ring disome, the monomer deposition after the cracking is lower than the surface aggregate formation parylene film of the soft-magnetic alloy powder of 30 ℃ (adopt cold air circulation modes) to temperature;
In the 3rd step, the adding mass percent is 30% methyl-prop diluted acid hydroxyl ethyl ester (HEMA), 20% water-soluble high-molecular material PVP, 20% dispersant Duramax in deionized water
TMD-3005,2% Ammonium Persulfate 98.5 fully mix, and make monomer solution; With percentage by weight is 90% add in the monomer solution through the coated soft-magnetic alloy powder of Parylene, fully mixes, and makes stable suspension system; Suspension system is heated to 60 ℃ in nitrogen, is incubated 8 hours, make methyl-prop diluted acid hydroxyl ethyl ester home position polymerization reaction take place and generate poly-methyl-prop diluted acid hydroxyl ethyl ester, dehydration, drying, granulation on the magnetic surface;
The 4th step, utilize compressing tablet, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-poly-methyl-prop diluted acid hydroxyl ethyl ester built-up magnet.
Embodiment nine
First and second, four the step with embodiment two.
The 3rd step was heated to 150 ℃ with caprolactam monomer and is fused into liquid, added the 6-ACA 6-aminocaproic acid (H of mass percent 2%
2N (CH
2)
5COOH) and fully stir, mix, make caprolactam monomer solution; In the caprolactam monomer liquation, add mass percent 90% through the coated soft-magnetic alloy powder of Parylene, and stir, make mixed system; Mixed system is heated to 180 ℃, is incubated 10 hours, make caprolactam monomer generate nylon-6 in the polymerization of soft-magnetic alloy powder surface in situ; Mixture after reaction finished carries out the tie rod pelletizing with twin-screw (single screw rod) extruder, obtains the soft-magnetic alloy powder particle of the even coated nylon-6 in surface.
Embodiment ten
First and second, four the step with embodiment two.
The 3rd step was heated to 150 ℃ with caprolactam monomer and is fused into liquid, added the 6-ACA 6-aminocaproic acid (H of mass percent 5%
2N (CH
2)
5COOH) and fully stir, mix, make caprolactam monomer solution; In the caprolactam monomer liquation, add mass percent 95% through the coated soft-magnetic alloy powder of Parylene, and stir, make mixed system; Mixed system is heated to 250 ℃, is incubated 5 hours, make caprolactam monomer generate nylon-6 in the polymerization of soft-magnetic alloy powder surface in situ; Mixture after reaction finished carries out the tie rod pelletizing with twin-screw (single screw rod) extruder, obtains the soft-magnetic alloy powder particle of the even coated nylon-6 in surface.
Embodiment 11
First and second, four the step with embodiment three.
In the 3rd step, the adding mass percent is 5% azo two isobutyls fine (AIBN) and fully stirs in styrene, mixes; In the styrene liquation, add mass percent 80% through the coated soft-magnetic alloy powder of Parylene, and stir, make mixed system; Mixed system is heated to 65 ℃ in nitrogen, is incubated 8 hours, make styrene monomer generate polystyrene in the polymerization of soft-magnetic alloy powder surface in situ.
Embodiment 12
First and second, four the step with embodiment three.
In the 3rd step, the adding mass percent is 10% azo two isobutyls fine (AIBN) and fully stirs in styrene, mixes; In the styrene liquation, add mass percent 90% through the coated soft-magnetic alloy powder of Parylene, and stir, make mixed system; Mixed system is heated to 80 ℃ in nitrogen, is incubated 5 hours, make styrene monomer generate polystyrene in the polymerization of soft-magnetic alloy powder surface in situ.
Embodiment 13
First and second, four the step with embodiment four.
In the 3rd step, the adding mass percent is 5% diphenyl peroxide acetyl (BPO) and fully stirs in methyl methacrylate, mixes; In the methyl methacrylate monomer liquation, add mass percent 80% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Suspension system is heated to 100 ℃ in nitrogen, is incubated 6 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the soft-magnetic alloy powder surface.
Embodiment 14
First and second, four the step with embodiment four.
In the 3rd step, the adding mass percent is 10% diphenyl peroxide acetyl (BPO) and fully stirs in methyl methacrylate, mixes; In the methyl methacrylate monomer liquation, add mass percent 95% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Suspension system is heated to 80 ℃ in nitrogen, is incubated 10 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the soft-magnetic alloy powder surface.
Embodiment 15
The first step, with 70 parts of pure iron, 5 parts of silicon and 1 part of aluminium are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 15 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-Si-Al alloy scale of 40 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 125～140 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 30 minutes under 500 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 700 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
In the 3rd step, the adding mass percent is 8% azo two isobutyls fine (AIBN) and fully stirs in the acrylic acid butyl ester, mixes; In acrylic acid butyl ester liquation, add mass percent 90% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Suspension system is heated to 65 ℃ in nitrogen, is incubated 6 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of soft-magnetic alloy powder surface in situ;
The 4th step, utilize compressing tablet at 120 ℃, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-polypropylene acid butyl ester built-up magnet.
Embodiment 16
The first step, with 90 parts of pure iron, 20 parts of silicon and 10 parts of aluminium are as raw material, obtain mother alloy ingot in the melting of intermediate frequency vacuum induction melting furnace, after the mother alloy ingot fragmentation, utilize the melt flash set technology to adopt the chill roll surface linear speed of 15 meter per seconds, smelting temperature is controlled at 1500 ℃, working chamber's forvacuum, charge into argon gas then, make thickness and be nano-crystalline Fe-Si-Al alloy scale of 40 microns, adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale, be 125～140 microns magnetically soft alloy particulate then by screening acquisition granularity, micro mist was carried out vacuum annealing 30 minutes under 500 ℃ of temperature, the average grain size of control magnetically soft alloy micro mist is about 10 nanometers;
Second step, the ring disome (C16H16) of paraxylene is heated to 700 ℃ in vacuum, make its monomer that is cracked into the ring disome, the monomer deposition after the cracking forms parylene film to the surface aggregate that temperature is lower than the soft-magnetic alloy powder of 30 ℃ (adopting the mode of cold air circulation);
In the 3rd step, the adding mass percent is 5% azo two isobutyls fine (AIBN) and fully stirs in the acrylic acid butyl ester, mixes; In acrylic acid butyl ester liquation, add mass percent 95% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Suspension system is heated to 80 ℃ in nitrogen, is incubated 4 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of soft-magnetic alloy powder surface in situ;
The 4th step, utilize compressing tablet at 120 ℃, extrude-calendering formation technology makes nano-crystal soft-magnetic powder-polypropylene acid butyl ester built-up magnet.
Embodiment 17
First and second, four the step with embodiment six.
In the 3rd step, the adding mass percent is 6% diphenyl peroxide acetyl (BPO) in the methyl methacrylate glycidyl ester monomer, and stirs; In methyl methacrylate glycidyl ester monomer liquation, add to add mass percent 80% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Mixed system is heated to 80 ℃ in nitrogen, is incubated 5 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the soft-magnetic alloy powder surface.
Embodiment 18
First and second, four the step with embodiment six.
In the 3rd step, the adding mass percent is 10% diphenyl peroxide acetyl (BPO) in the methyl methacrylate glycidyl ester monomer, and stirs; In methyl methacrylate glycidyl ester monomer liquation, add to add mass percent 95% through the coated soft-magnetic alloy powder of Parylene, make suspension system; Mixed system is heated to 90 ℃ in nitrogen, is incubated 6 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the soft-magnetic alloy powder surface.
As mentioned above, can realize the present invention preferably.
Claims (10)
1, the preparation method of compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer is characterized in that, comprises the steps and process conditions:
The first step, adopting the melt flash set technology to make thickness is 10～40 microns Fe-B-Si-Nb-Cu or Fe-Si-Al series alloy scale, with the broken granularity that obtains of fast quenching scale is 25～140 microns magnetically soft alloy particulate, micro mist was carried out vacuum annealing 30～120 minutes under 450～600 ℃ of temperature, the crystallite dimension of control magnetically soft alloy micro mist is in 10～40 nanometers;
Second step, adopt vacuum evaporation technology at magnetic surface deposition one deck parylene film, insulated and stabilization processes in the magnetic surface;
The 3rd step added magnetic in the polymer monomer solution, made stable suspension system, made monomer on the soft-magnetic alloy powder surface home position polymerization reaction take place and generated polymer, realized that soft-magnetic alloy powder mixes with the even of polymer;
The 4th step, adopt compressing tablet, extrude-calendering technology prepares described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer.
2, according to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that, in the described melt flash set technology, chill roll surface linear speed 10～40 meter per seconds, working chamber's forvacuum charges into high-purity argon gas then; Adopt vacuum rolling ball milling technology with the fragmentation of fast quenching scale.
3, according to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that, the ring disome (C16H16) that described second step is the employing paraxylene is warming up to 650～700 ℃ in a vacuum makes its cracking, adopt the mode of cold air circulation to make magnetically soft alloy micro mist temperature be lower than 30 ℃, the pyrolysis product of ring disome that makes paraxylene is at the micro mist surface aggregation and polymerization takes place, and forms parylene film.
4, according to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that described polymer monomer comprises methyl-prop diluted acid hydroxyl ethyl ester, caprolactam, styrene, methyl methacrylate, acrylic acid butyl ester, methyl methacrylate ethylene oxidic ester.
5, according to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that, described the 3rd step comprises: (1) adds mass percent in deionized water be 5～30% methyl-prop diluted acid hydroxyl ethyl ester, 0～20% water-soluble high-molecular material, 3～20% dispersant, 0.15～2% initator, makes monomer solution; (2) be that 80～95% soft-magnetic alloy powder adds in the monomer solution with mass percent, make suspension system; (3) suspension system is heated to 60～70 ℃ in nitrogen, is incubated 2～8 hours, home position polymerization reaction takes place on the magnetic surface and generates poly-methyl-prop diluted acid hydroxyl ethyl ester in methyl-prop diluted acid hydroxyl ethyl ester.
6, according to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that, described the 3rd step comprises: (1) becomes liquid with the caprolactam monomer heat fused, the adding mass percent concentration is 2～5% 6-ACA 6-aminocaproic acid, makes caprolactam monomer solution; (2) adding mass percent in the caprolactam monomer liquation is 80～95% soft-magnetic alloy powder, makes suspension system; (3) suspension system is heated to 180～250 ℃, is incubated 5～10 hours, make caprolactam monomer generate nylon-6 in the polymerization of soft-magnetic alloy powder surface in situ.
According to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that 7, described the 3rd step comprises: (1) adds mass percent is that 5～10% azo two isobutyls are fine in styrene; (2) soft-magnetic alloy powder of adding mass percent 80～95% in the styrene liquation makes suspension system; (3) suspension system is heated to 65～80 ℃ in nitrogen, is incubated 5～8 hours, make styrene monomer generate polystyrene in the polymerization of soft-magnetic alloy powder surface in situ.
According to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that 8, described the 3rd step comprises: (1) adds mass percent is 5～10% diphenyl peroxide acetyl in methyl methacrylate; (2) soft-magnetic alloy powder of adding mass percent 80～95% in the methyl methacrylate monomer liquation makes suspension system; (3) suspension system is heated to 80～100 ℃ in nitrogen, is incubated 6～10 hours, make methyl methacrylate monomer home position polymerization reaction take place and generate polymethyl methacrylate on the soft-magnetic alloy powder surface.
According to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that 9, described the 3rd step comprises: (1) adds mass percent is that 5～10% azo two isobutyls are fine in the acrylic acid butyl ester; (2) soft-magnetic alloy powder of adding mass percent 80～95% in acrylic acid butyl ester liquation makes suspension system; (3) suspension system is heated to 65～80 ℃ in nitrogen, is incubated 4～6 hours, make acrylic acid butyl ester monomer generate the polypropylene acid butyl ester in the polymerization of soft-magnetic alloy powder surface in situ.
10, according to the preparation method of the described compound electromagnetic shield magnet of nanocry stal magnetically soft alloy powder polymer of claim 1, it is characterized in that described the 3rd step comprises: (1) adds mass percent is 5～10% diphenyl peroxide acetyl in the methyl methacrylate glycidyl ester monomer; (2) soft-magnetic alloy powder of adding mass percent 80～95% in methyl methacrylate glycidyl ester monomer liquation makes suspension system; (3) suspension system is heated to 80～100 ℃ in nitrogen, is incubated 5～7 hours, make the methyl methacrylate glycidyl ester monomer home position polymerization reaction take place and generate the polymethyl methacrylate ethylene oxidic ester on the soft-magnetic alloy powder surface.
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