CN109880590B - Fe3Al@Al2O3Absorbent, preparation method thereof and wave-absorbing adhesive tape - Google Patents
Fe3Al@Al2O3Absorbent, preparation method thereof and wave-absorbing adhesive tape Download PDFInfo
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Abstract
The invention discloses Fe3Al@Al2O3Absorbent, preparation method thereof, wave-absorbing adhesive tape and Fe3Al@Al2O3The absorbent is of a core-shell structure and is composed of DO3Type Fe3Al inner core and α -Al2O3And (4) a nano shell. Fe3Al@Al2O3The preparation method of the absorbent is a three-step method of mechanical alloying, ordered transformation and controlled oxidation. Core-shell structure Fe prepared by the invention3Al@Al2O3The absorbent has the beneficial effects of high wave-absorbing efficiency, wide absorption frequency band and long-acting antioxidation; mixing Fe3Al@Al2O3The absorbent is applied to the wave-absorbing adhesive tape, and the wave-absorbing adhesive tape sequentially comprises a wave-absorbing layer, a protective layer, an adhesive layer and a release film from bottom to top, wherein Fe3Al@Al2O3The absorber is present in the absorbing layer. Containing Fe3Al@Al2O3The wave-absorbing adhesive tape of the absorbent not only has the long-acting anti-oxidation, high-efficiency and broadband wave-absorbing functions, but also is convenient to carry and transport.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to Fe3Al@Al2O3An absorbent, a process for its preparation, and a composition comprising Fe3Al@Al2O3Absorbent wave-absorbing adhesive tape.
Background
With the rapid development of modern radar detection technology, the possibility that traditional combat weapons such as missiles, airplanes, ships, tanks, and the like are monitored and destroyed is greatly increased. Therefore, the radar stealth technology research aiming at reducing weapon equipment characteristic signals and improving weapon system survival and penetration capability has extremely important significance. The Radar stealth technology mainly realizes the reduction of Radar scattering Cross sections (RCS) of a detected target and the reduction of weapon equipment characteristic signals through two technical approaches of appearance design stealth and Radar wave-absorbing material stealth. However, for aerospace weaponry equipment such as airplanes and missiles moving at high speed, the maximum flight speed of the aeronautical and astronautic weaponry equipment reaches Mach 2-3 (such as Mach 2.5 in China and Mach 3 in American SR 71), and the surface temperature of a fuselage or an elastomer can reach 100-350 ℃ due to severe friction with the ambient air. Limited by the appearance structure and the pneumatic streamline characteristics, the RCS is difficult to reduce only by adopting invisible appearance design, and the surface of the RCS is coated with radar absorbing materials. Therefore, the research and development of the radar wave-absorbing material capable of being used in the temperature range of 100-350 ℃ becomes a bottleneck problem to be solved at present.
Radar wave-absorbing materials can be classified according to different loss mechanisms of electromagnetic waves: an electrically lossy type and a magnetically lossy type. Electric loss absorbent (e.g. carbon material, SiC, ZnO, Al)2O3Etc.) utilize electron polarization or interface polarization attenuation to absorb electromagnetic waves, and has the advantages of high temperature resistance, good high-frequency wave-absorbing performance and the like. However, the electrical loss absorbent generally has the disadvantages of narrow wave-absorbing frequency band, low absorption efficiency and the like, and in practical use, a method of increasing the thickness of the wave-absorbing coating is often adopted to improve the wave-absorbing performance. However, the requirement of the aerospace weaponry for "light weight and weight reduction" is contradicted, and the requirement becomes one of the technical bottlenecks which restrict the stealth of the weaponry. The magnetic loss absorbent (such as ferrite, carbonyl iron powder, magnetic metal powder and the like) absorbs electromagnetic waves by attenuation of hysteresis loss, domain wall resonance, natural resonance and the like, has the outstanding advantages of wide absorption frequency band, high wave-absorbing efficiency and the like, and the prepared wave-absorbing coating has small thickness and satisfies the requirementsThe wave absorbing material is required to be thin, light, wide and strong. However, the magnetic loss absorbent has poor stability and is easy to oxidize at the temperature of 100-350 ℃, so that the wave absorbing performance is reduced. For example, when the ambient temperature is higher than 100 ℃, the spontaneous magnetization of the material is reduced, the magnetic permeability is reduced, and the wave-absorbing performance and the bandwidth of the ferrite absorbent are deteriorated; when the environmental temperature is higher than 180 ℃, the carbonyl iron powder absorbent is easy to react with oxygen in the air, and the surface structure composition of the absorbent is damaged, so that the wave absorbing performance of the absorbent gradually deteriorates along with the service time. Therefore, the research and development of the ideal magnetic loss absorbent which has excellent oxidation resistance and can keep high-efficiency wave absorption performance in an environment of 100-350 ℃ is one of the key problems which need to be solved urgently by the radar of the current aerospace weaponry.
In addition, for major military weaponry, the maintenance cost of the wave-absorbing coating is extremely high, and the rapid attenuation of the wave-absorbing performance is caused by the local damage of the wave-absorbing coating, so that the possibility that the weaponry is detected and discovered by radar is undoubtedly increased, and the survival and the defense-bursting capacity of the weaponry system are reduced. Therefore, the development of a wave-absorbing adhesive tape with excellent absorption performance for the daily and rapid repair and maintenance of in-service weaponry is another key problem to be solved at present.
Disclosure of Invention
The invention aims to provide Fe3Al@Al2O3The absorbent solves the problems that the magnetic loss absorbent in the prior art is easy to oxidize and has poor stability in the environment of 100-350 ℃.
It is another object of the present invention to provide Fe as described above3Al@Al2O3A preparation method of the absorbent.
It is still another object of the present invention to provide a composition comprising Fe3Al@Al2O3The wave-absorbing adhesive tape of the absorbent solves the problems that in the prior art, the wave-absorbing coating is high in maintenance cost, and the wave-absorbing performance is rapidly attenuated due to the fact that the wave-absorbing coating is partially damaged and falls off.
The technical scheme adopted by the invention is that Fe3Al@Al2O3Absorbent, the core material being DO3Type Fe3Al powder with a particle diameter of 3-5 μm and a shell material of α -Al2O3The shell layer has a thickness of 100-200 nm.
The core material is a magnetic loss DO having good impedance matching characteristics and electromagnetic wave attenuation characteristics3Type Fe3Al intermetallic compound, the shell material is α -Al with dielectric loss characteristic and heat insulation effect2O3Ceramics, both of which have good interfacial compatibility.
Fe3Al@Al2O3The absorbent has the following outstanding advantages:
(1)α-Al2O3the nano shell layer has higher resistivity and dielectric constant, can not only greatly reduce the reflection of incident electromagnetic waves on the surface of the material, but also can be towards DO3Type Fe3The transmission of the Al inner core provides a channel, so that the impedance matching characteristic of the absorbent is greatly improved;
(2)α-Al2O3the nano shell layer is an electrical loss absorbent with good wave absorption performance, has extremely strong surface effect and interface effect on electromagnetic waves, can fully exert polarization mechanisms such as molecular polarization, dipole polarization, interface polarization and the like to relax and attenuate the electromagnetic waves, and can react with DO3Type Fe3After the Al core is compounded, the synergistic wave absorbing effect of two different loss mechanism absorbents can be fully exerted, and the purposes of greatly improving the electromagnetic wave absorption efficiency and expanding the bandwidth are achieved;
(3)α-Al2O3nanosuhell and DO3Type Fe3A large number of heterostructures exist at the core-shell interface of the Al inner core, so that interface relaxation and multiple scattering effects can be generated on electromagnetic waves, and the Al inner core has better electromagnetic wave attenuation characteristics;
(4)DO3type Fe3α -Al with uniform and dense Al surface2O3The nano shell can effectively block the invasion of oxygen atoms and greatly reduce DO3Type Fe3Possibility of Al oxidation failure, therefore, Fe3Al@Al2The O absorbent not only has excellent broadband wave-absorbing performance, but also is expected to solve the problem that the existing magnetic loss absorbent is difficult to be 10A technical barrier for long-term service in an environment of 0-350 ℃.
If external α -Al2O3When the shell is damaged, its internal DO3Type Fe3Al in Al diffuses outwards along the direction of concentration gradient and combines with oxygen in the environment to form α -Al2O3Can play a self-repairing function after filling up the damaged part, thereby ensuring Fe3Al@Al2Long-acting oxidation resistance of the O absorbent.
The other technical scheme adopted by the invention is that Fe3Al@Al2O3The preparation method of the absorbent specifically comprises the following steps:
step S1, preparing Fe by adopting Fe powder and Al powder through a mechanical alloying method3Al precursor powder, namely Fe (Al) solid solution powder;
step S2, preparing DO by using an order transformation method3Type Fe3Al powder;
step S3, adopting oxidation control method at DO3Type Fe3α -Al is generated on the outer surface of the Al powder in situ2O3Shell layer, preparing Fe3Al@Al2O3An absorbent;
further, in step S1, Fe: the Al powder has atomic number ratio of (78:22) - (68:32), the mechanical alloying method comprises the steps of performing dry milling on the Al powder at ball-material ratio of (10:1) - (20:1), rotating speed of 300-400 rpm and ball milling time of 20-30 h, wherein the ball milling ball is a stainless steel ball, protective gas in the ball milling process is inert gas, and a process control agent CH is added in the ball milling process3(CH2)16CO2H, the mass of the process control agent is 1-2% of the total mass of the powder.
Wherein, the Fe: if the atomic number ratio of the Al powder is not within the above range, DO in step S2 cannot be obtained3Type Fe3Al powder;
the ball-to-material ratio reflects the energy given during ball milling, and if the ball-to-material ratio is too small, the powder is mixed unevenly, so that the alloying degree is influenced; the powder cold welding is aggravated and the agglomeration phenomenon is caused when the ball material ratio is too large;
the rotating speed is matched with the ball-to-material ratio, key factors influencing the mechanical alloying effect are jointly formed, and the powder refining degree and the alloying degree are directly influenced by too low or too high rotating speed;
too short ball milling time results in that Al is not completely dissolved into the crystal lattice of Fe and the desired Fe is not formed3Al precursor powder, namely Fe (Al) solid solution powder; the ball milling time is too long, on one hand, the coarsening of crystal grains can be caused, and on the other hand, the waste of energy is caused;
adopts dry grinding, avoids the problem of possible introduction of impurities in the wet grinding process, reduces the production cost, saves the time, avoids the steps of subsequent drying of the wet grinding and the like, and in addition, adds a process control agent CH3(CH2)16CO2The H function is to reduce the bonding effect of the metal powder with the grinding balls and the ball-milling tank, improve the ball-milling efficiency and the powder yield, and the ball-milling efficiency is reduced and the powder yield is low because the addition amount of the process control agent is not in the range;
compared with the powder prepared by a gas atomization method and an electrolytic deposition method, the mechanical alloying method is selected to prepare Fe3The Al precursor powder has the advantages of simple equipment and easy operation, and is suitable for batch production.
Further, the ordering transformation method adopted in step S2 is Fe3Annealing Al precursor powder, namely Fe (Al) solid solution powder in vacuum at 500-550 ℃, and preserving heat for 2-3 h;
in step S2, the solid solution powder of Fe (Al) is converted into DO3Type Fe3The temperature of Al ordering transformation is 500-550 ℃, the temperature is lower than 500 ℃, and the Al ordering transformation can not be converted into DO with long-range order3Type Fe3Al, temperature above 550 ℃, DO3Type Fe3Al can be converted to a partially-ordered B2 structure in a two-stage phase change manner, and DO cannot be obtained3Type Fe3Al；
The heat preservation time determines the degree of order transformation, and the too short heat preservation time causes insufficient order transformation, thereby affecting DO3Type Fe3Long-range order of the Al powder; too long heat preservation time can cause that the crystalline grain is thick, even the powder bonds into the piece, influences its absorbing performance.
Further, the oxidation control method adopted in step S3 is: at PO2Calcining for 1-2 h at 750-950 ℃ under the condition of 0.01-0.1 Pa;
by controlled oxidation based on DO3Type Fe3The Al powder can spontaneously form α -Al under the high temperature condition2O3The characteristics of the oxide film, if the oxygen pressure is too low, it cannot provide sufficient oxygen atoms, in DO3Type Fe3The Al surface can not form uniform and compact α -Al2O3Shell layer, if the oxygen pressure is too high, Fe is easy to combine with O to form iron oxide instead of α -Al2O3An oxide film; at PO2α -Al under the conditions of 0.01-0.1 Pa and calcining temperature of 750-950 DEG C2O3Growing oxide nucleation prior to iron, i.e. ensuring DO obtained in step S23Type Fe3The uniform and compact α -Al is generated on the surface of the Al powder in situ2O3Oxide film, i.e. the resulting core-shell structure;
the calcination temperature determines the in-situ formed α -Al2O3The particle size of the particles is in the range of the temperature, the particle size of the obtained particles is in the nanometer level, and the thickness of the shell layer is 100-200 nm.
The other technical scheme adopted by the invention is that the wave-absorbing adhesive tape contains Fe3Al@Al2O3An absorbent.
Further, the wave-absorbing layer is composed of a wave-absorbing layer, a protective layer, an adhesive layer and a release film from bottom to top in sequence, as shown in fig. 8, the wave-absorbing layer is composed of 50-70% of Fe by mass3Al@Al2O3The wave-absorbing adhesive tape comprises an absorbent, 15-25% of a binder and 10-25% of a plasticizer, and the mass fraction of the wave-absorbing layer is not in the range, so that the performance of the wave-absorbing adhesive tape can be affected.
Further, the binder is any one of polyimide resin or acrylic acid glue; the plasticizer is epoxidized soybean oil acid octyl ester.
Further, the thickness of the wave absorbing layer is 500-700 mu m; the thickness of the protective layer is 200-400 mu m; the thickness of the adhesive layer is 100-200 mu m; the thickness of the release film is 100-200 mu m, and the obtained wave-absorbing adhesive tape has poor wave-absorbing performance if the thickness is not in the range.
Further, the protective layer is reticular polyaniline; the adhesive layer is epoxy resin adhesive; the release film is PE coated paper. The preparation method of the wave-absorbing adhesive tape is a conventional preparation method.
The invention has the beneficial effects that the core-shell structure Fe is obtained by adopting the mechanical alloying-ordering transformation-controlled oxidation three-step method3Al@Al2O3The absorbent is used as a novel antioxidant and efficient wave-absorbing absorbent, has good interface compatibility, impedance matching property and electromagnetic wave attenuation property, can be used in the environment of 100-350 ℃, is expected to solve the technical barrier that the existing magnetic loss absorbent is difficult to serve in the environment of 100-350 ℃ for a long time, meets the strict requirements of modern aerospace weaponry on strong absorption, high temperature resistance and long service life of stealth materials, and has important scientific significance and military application prospect for realizing the stealth of the aerospace weaponry and weakening characteristic signals of the aerospace weaponry.
The wave-absorbing layer of the wave-absorbing adhesive tape contains Fe3Al@Al2O3The absorbent, therefore, the wave-absorbing adhesive tape not only has the long-acting anti-oxidation, high-efficiency and broadband wave-absorbing function, but also is convenient to carry and transport, is beneficial to quickly repairing the locally damaged wave-absorbing coating on the surface of large-scale weaponry, greatly reduces the maintenance cost and the maintenance time, and has important scientific significance and military application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a morphology chart of the Fe (Al) solid solution powder obtained in example 1.
FIG. 2 is DO obtained in example 13Type Fe3And (5) an Al powder morphology graph.
FIG. 3 shows Fe obtained in example 13Al@Al2O3And (5) a profile map of the absorbent.
FIG. 4 shows Fe obtained in example 13Al@Al2O3Transmission electron microscopy of the absorber.
FIG. 5 shows Fe obtained in example 13Al@Al2O3Reflection loss profile of the absorber.
FIG. 6 shows Fe obtained in example 23Al@Al2O3Reflection loss profile of the absorber.
FIG. 7 shows Fe obtained in example 33Al@Al2O3Reflection loss profile of the absorber.
Figure 8 is a structural schematic diagram of the wave-absorbing adhesive tape.
Figure 9 is the XRD pattern of example 1.
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.
Example 1
Fe3Al@Al2O3The preparation method of the absorbent specifically comprises the following steps:
step S1, preparing Fe powder and Al powder with atomic number ratio of 75: 25, adopting a mechanical alloying method to ensure that the ball-material ratio is 15:1, the rotating speed is 350rpm, the ball milling time is 25 hours, the ball milling grinding balls are stainless steel grinding balls, the protective gas is inert gas, and CH accounting for 1 percent of the total mass of the powder is added3(CH2)16CO2H, obtaining Fe (Al) solid solution powder as shown in figure 1;
step S2, preparing DO by using an order transformation method3Type Fe3As shown in figure 2, the Al powder is used as a core material of an absorbent, and the specific technological parameters are that the vacuum annealing temperature is 520 ℃, and the heat preservation is carried out for 2.5 hours;
step S3, adopting oxidation control method at DO3Type Fe3α -Al is generated on the outer surface of the Al powder in situ2O3A shell layer with a process parameter of PO2Fe is prepared under the conditions of 0.05Pa, 850 ℃ and 1.5h of calcination time3Al@Al2O3Absorbent, as shown in fig. 3.
From FIG. 4, it can be seen that Fe is obtained by the above-mentioned steps3Al@Al2O3The absorbent is in a core-shell structure. Fe of example 13Al@Al2O3Absorbent core material DO3Type Fe3The diameter of Al powder particles is 4 μm, and the specific surface area is 2.2m2The thickness of the shell material is 150 nm.
For the obtained Fe3Al@Al2O3The wave-absorbing performance of the absorbent is tested, and FIG. 5 shows that the thickness of the absorbent is 1.5mm and Fe3Al@Al2O3The reflection loss of the wave-absorbing coating obtained by the absorbent and the high-temperature resistant epoxy resin changes along with the frequency at the temperature of 250 ℃. As can be seen from FIG. 5, Fe3Al@Al2O3The absorption peak of the absorbent is 9.72GHz, the peak absorption efficiency is-38.3 dB, and the effective bandwidth less than-10 dB is 6.55 GHz. Fig. 9 is an XRD pattern of the product obtained in step S1, step S2, step S3 in example 1.
Example 2
Fe3Al@Al2O3The preparation method of the absorbent specifically comprises the following steps:
step S1, firstly, preparing Fe powder and Al powder with the atomic number ratio of 78:22, adopting a mechanical alloying method to ensure that the ball-material ratio is 10:1, the rotating speed is 400rpm, the ball milling time is 20 hours, the ball milling grinding ball is a stainless steel grinding ball, the protective gas is inert gas, and CH accounting for 1.5 percent of the total mass of the powder is added3(CH2)16CO2H, obtaining Fe (Al) solid solution powder;
step S2, preparing DO by using an order transformation method3Type Fe3Al powder is used as a core material of the absorbent, and the specific technological parameters are that the vacuum annealing temperature is 500 ℃, and the heat preservation is carried out for 3 hours;
step S3, adopting oxidation control method at DO3Type Fe3α -Al is generated on the outer surface of the Al powder in situ2O3A shell layer with a specific selected process parameter of PO2Under the conditions of 0.1Pa, 950 ℃ and 1h as calcination temperature, Fe is prepared3Al@Al2O3An absorbent.
Fe of example 23Al@Al2O3The diameter of the core material particle of the absorbent is 5 μm, and the specific surface area is 2m2The thickness of the shell material is 200 nm.
For the obtained Fe3Al@Al2O3The wave absorbing performance of the absorbent is tested, and Fe with the thickness of 1.5mm is selected3Al@Al2O3The reflection loss of the wave-absorbing coating obtained by the absorbent and the high-temperature resistant epoxy resin changes along with the frequency at the temperature of 100 ℃. As can be seen from FIG. 6, the absorption peak of the absorber is 9.81GHz, the peak absorption efficiency is-41.2 dB, and the effective bandwidth less than-10 dB is 5.89 GHz.
Example 3
Fe3Al@Al2O3The preparation method of the absorbent specifically comprises the following steps:
step S1, preparing Fe powder and Al powder with the atomic number ratio of 68:32, adopting a mechanical alloying method to ensure that the ball-material ratio is 20:1, the rotating speed is 300rpm, the ball milling time is 30 hours, the ball milling grinding ball is a stainless steel grinding ball, the protective gas is inert gas, and CH accounting for 2 percent of the total mass of the powder is added3(CH2)16CO2H, obtaining Fe (Al) solid solution powder;
step S2, preparing DO by using an order transformation method3Type Fe3Al powder is used as a core material of the absorbent, and the specific technological parameters are that the vacuum annealing temperature is 550 ℃, and the heat is preserved for 2 hours;
step S3, adopting oxidation control method at DO3Type Fe3α -Al is generated on the outer surface of the Al powder in situ2O3The outer shell layer is formed by a plurality of layers,the process parameter is PO2Fe is prepared by 0.01Pa, the calcining temperature is 750 ℃, and the calcining time is 2h3Al@Al2O3An absorbent.
Fe of example 33Al@Al2O3The diameter of the core material particle of the absorbent is 3 μm, and the specific surface area is 2.5m2The thickness of the shell material is 100 nm.
For the obtained Fe3Al@Al2O3The wave absorbing performance of the absorbent is tested, and Fe with the thickness of 1.5mm is selected3Al@Al2O3The reflection loss of the wave-absorbing coating obtained by the absorbent and the high-temperature resistant epoxy resin changes along with the frequency at the temperature of 350 ℃. As can be seen from FIG. 7, the absorption peak of the absorbent is 8.91GHz, the peak absorption efficiency is-29.8 dB, and the effective bandwidth less than-10 dB is 2.69 GHz.
Example 4
The wave-absorbing adhesive tape consists of a wave-absorbing layer, a protective layer, an adhesive layer and a release film from bottom to top in sequence, wherein the wave-absorbing layer consists of 50% of Fe by mass3Al@Al2O3Absorbent, 25% of binder and 25% of plasticizer; the binder is polyimide resin; the plasticizer is epoxy soybean octyl oleate; the thickness of the wave absorbing layer is 500 mu m; the thickness of the protective layer is 200 μm; the thickness of the adhesive layer is 200 μm; the thickness of the release film is 200 mu m; the protective layer is reticular polyaniline; the adhesive layer is epoxy resin adhesive; the release film is PE coating paper. The wave-absorbing adhesive tape is used at the joint of the cabin door of the airplane, greatly reduces the radar scattering cross section of the fighter and improves the stealth effect of the fighter.
Example 5
The wave-absorbing adhesive tape consists of a wave-absorbing layer, a protective layer, an adhesive layer and a release film from bottom to top in sequence, wherein the wave-absorbing layer consists of 60% of Fe by mass3Al@Al2O3Absorbent, 20% of binder and 20% of plasticizer; the binder is acrylic acid glue; the plasticizer is epoxy soybean octyl oleate; the thickness of the wave absorbing layer is 600 mu m; the thickness of the protective layer is 300 mu m; the thickness of the adhesive layer is 150 μm; the thickness of the release film is 150 mu m; the protective layer is reticular polyaniline; the adhesive layer is epoxy resin adhesive; the release film is PE coating paper; the suctionThe wave adhesive tape can be used for the seam of the aircraft maintenance opening cover, greatly reduces the radar scattering cross section of the aircraft, and improves the stealth effect of the aircraft.
Example 6
The wave-absorbing adhesive tape consists of a wave-absorbing layer, a protective layer, an adhesive layer and a release film from bottom to top in sequence, wherein the wave-absorbing layer consists of 70% of Fe by mass3Al@Al2O3Absorbent, 15% of binder and 15% of plasticizer; the binder is polyimide resin; the plasticizer is epoxy soybean octyl oleate; the thickness of the wave absorbing layer is 500 mu m; the thickness of the protective layer is 200 μm; the thickness of the adhesive layer is 200 μm; the thickness of the release film is 200 mu m; the protective layer is reticular polyaniline; the adhesive layer is epoxy resin adhesive; the release film is PE coating paper; the wave-absorbing adhesive tape can be used for conveniently repairing local damage on the surface of a fighter plane body, and the defects of high maintenance cost and long time consumption of the traditional spraying type wave-absorbing coating are overcome.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1.Fe3Al@Al2O3Absorbent, characterized in that the core material is DO3Type Fe3Al powder with a particle diameter of 3-5 μm and a shell material of α -Al2O3The shell layer has a thickness of 100-200 nm.
2. Fe as claimed in claim 13Al@Al2O3A method for producing an absorbent, characterized in thatThe method comprises the following steps:
step S1, preparing Fe by adopting Fe powder and Al powder through a mechanical alloying method3Al precursor powder, namely Fe (Al) solid solution powder;
step S2, preparing DO by using an order transformation method3Type Fe3Al powder;
step S3, adopting oxidation control method at DO3Type Fe3α -Al is generated on the outer surface of the Al powder in situ2O3Shell layer of Fe3Al@Al2O3An absorbent;
fe in step S1: the atomic ratio of the Al powder is (78:22) - (68:32), the ball-to-material ratio of the mechanical alloying method is (10:1) - (20:1), the rotating speed is 300-400 rpm, the ball milling time is 20-30 h, the grinding balls are stainless steel grinding balls, the protective gas in the ball milling process is inert gas, and a process control agent CH is added in the ball milling process3(CH2)16CO2H, the mass of the process control agent is 1-2% of the total mass of the powder;
the order conversion method in step S2 includes: mixing Fe3Annealing the Al precursor powder in vacuum at 500-550 ℃, and keeping the temperature for 2-3 h;
the oxidation control method in step S3 includes: at PO2Calcining for 1-2 h at 750-950 ℃ under the condition of 0.01-0.1 Pa.
3. A wave-absorbing adhesive tape comprising Fe according to claim 13Al@Al2O3An absorbent.
4. The wave-absorbing adhesive tape according to claim 3, which consists of a wave-absorbing layer, a protective layer, an adhesive layer and a release film in sequence from bottom to top, wherein the wave-absorbing layer consists of 50-70% of Fe by mass3Al@Al2O3The adhesive consists of an absorbent, 15-25% of a binder and 10-25% of a plasticizer.
5. The wave-absorbing adhesive tape according to claim 4, wherein the binder is any one of polyimide resin or acrylic acid glue; the plasticizer is epoxidized soybean oil acid octyl ester.
6. The wave-absorbing adhesive tape according to claim 4, wherein the thickness of the wave-absorbing layer is 500-700 μm; the thickness of the protective layer is 200-400 mu m; the thickness of the adhesive layer is 100-200 mu m; the thickness of the release film is 100-200 mu m.
7. The wave-absorbing adhesive tape according to any one of claims 4 to 6, wherein the protective layer is reticular polyaniline; the adhesive layer is epoxy resin adhesive; the release film is PE coated paper.
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| CN101381104A (en) * | 2008-10-24 | 2009-03-11 | 北京科技大学 | Method for preparing NbAl3 intermetallic compound |
| CN102000457A (en) * | 2010-10-12 | 2011-04-06 | 广州格瑞特材料科技有限公司 | Fe3Al intermetallic compound filter element and pre-oxidization treatment method and application thereof |
| CN102021469A (en) * | 2010-11-02 | 2011-04-20 | 山东开泰抛丸机械有限公司 | Powder for strengthening wear resistance of high-chromium iron, preparing method thereof and wear resistant castings |
| CN205115362U (en) * | 2015-10-21 | 2016-03-30 | 李同乐 | Inhale ripples shielding sticky tape |
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| CN102021473B (en) * | 2010-12-16 | 2012-11-28 | 西安交通大学 | Method for preparing Fe3Al-Al2O3 composite material |
| CN106893516A (en) * | 2017-04-01 | 2017-06-27 | 合肥达悦电子科技有限公司 | Shading shielding tape |
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|---|---|---|---|---|
| CN101381104A (en) * | 2008-10-24 | 2009-03-11 | 北京科技大学 | Method for preparing NbAl3 intermetallic compound |
| CN102000457A (en) * | 2010-10-12 | 2011-04-06 | 广州格瑞特材料科技有限公司 | Fe3Al intermetallic compound filter element and pre-oxidization treatment method and application thereof |
| CN102021469A (en) * | 2010-11-02 | 2011-04-20 | 山东开泰抛丸机械有限公司 | Powder for strengthening wear resistance of high-chromium iron, preparing method thereof and wear resistant castings |
| CN205115362U (en) * | 2015-10-21 | 2016-03-30 | 李同乐 | Inhale ripples shielding sticky tape |
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