CN109850950A - A kind of absorbing material and preparation method thereof compound by barium ferrite and carbon nanotube - Google Patents
A kind of absorbing material and preparation method thereof compound by barium ferrite and carbon nanotube Download PDFInfo
- Publication number
- CN109850950A CN109850950A CN201811525479.5A CN201811525479A CN109850950A CN 109850950 A CN109850950 A CN 109850950A CN 201811525479 A CN201811525479 A CN 201811525479A CN 109850950 A CN109850950 A CN 109850950A
- Authority
- CN
- China
- Prior art keywords
- preparation
- barium ferrite
- absorbing material
- barium
- ammonium hydroxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Hard Magnetic Materials (AREA)
- Compounds Of Iron (AREA)
Abstract
The invention discloses a kind of preparation methods of absorbing material compound by barium ferrite and carbon nanotube.Preparation method include prepare barium ferrite, it is compound, be condensed back, washing and etc..This method prepares barium ferrite using Sol-Gel auto-combustion method, gained particle uniform nano barium ferrite particle, it is with preferable magnetic performance performance, it is finally using silane coupling agent that it is compound with carbon nanotube, and this method simple process, available can preferable composite wave-suction materials.
Description
Technical field
The invention belongs to functional material preparation technical fields, and in particular to a kind of high performance microwave absorbing material and its preparation
Method.
Background technique
Since 21st century, science and technology enters the gold period of development, and all kinds of scientific and technological achievements also obtain directly in succession
Use is scooped out, therefore people's lives quality is significantly improved.But it is at full speed with communication, space technology and wireless electron technology
Development, electromagnetic radiation are also increasingly serious.Electromagnetic pollution not only will affect the normal operation of industrial equipment, but also to human body
Health generate harm.These factors can generate negative effect to the raising of people's quality of life, therefore we are badly in need of taking
Measure solves the problems, such as Contamination of Electromagnetic Wave.
Absorbing material be solve Problem of Electromagnetic Waves one of effective measures, ferrite as traditional absorbing material have compared with
Good magnetic property has certain magnetic loss performance to microwave.However, single absorbing material is difficult to reach in the new era
Multiband, wide band assimilation effect, commonly used approach are exactly ion doping, compound, special appearance, nanosizing etc.,
To obtain a kind of absorbing material of better performances.
The barium ferrite of Magnetoplumbate-type has more excellent compared to the ferrite of spinel-type as the ferritic one kind of tradition
Different magnetic property, including biggish coercivity, higher saturation magnetization and remanent magnetization.Due to its excellent magnetic
Performance is learned, can be used as a kind of magnetic loss type absorbing material.But barium ferrite does not have dielectric properties, cannot generate Jie to microwave
Electrical loss, and autologous density is larger, limits its application as microwave absorbing coating.Carbon nanotube is a kind of suction wave material that comparison is new
Material.It is bigger than some common absorbing material areas, and draw ratio wants higher.Along with this hollow tubular structure,
Excellent thermal conductivity and electric conductivity are shown, dielectric material is belonged to, biggish dielectric loss can produce to microwave.Except this it
Outside, carbon nanotube not only possesses the characteristic of metal, also there is some characteristics of semiconductor.Since it has nanostructure, have more
The special mechanism of kind, including dimensional effect and interfacial polarization etc..
Summary of the invention
It is compound it is an object of the invention to carry out barium ferrite and carbon nanotube, preferable composite effect is obtained, in turn
Obtain a kind of high performance microwave absorbing material.
The purpose of the invention is achieved by the following technical solution.
A kind of barium ferrite/carbon nano tube compound material preparation method comprising the steps of:
(1) barium ferrite is prepared first；
(2) silane coupling agent is added in dehydrated alcohol and ammonium hydroxide, is uniformly mixed and obtains silane coupler solution, then will
It is added in silane coupler solution and is reacted after barium ferrite and carbon nanotube mixing；
(3) washing is to no ammonium hydroxide smell after reaction, and then filtration drying grinds to obtain the absorbing material.
Preferably, barium ferrite and the mass ratio of carbon nanotube are 91-95:5-9, the step (2) in the step (2)
The volume ratio of middle ethyl alcohol and ammonium hydroxide is 5-8:1, and the concentration of the silane coupling agent is 95-99wt%, silane coupler solution
Concentration is 4-5wt%.
Preferably, barium ferrite and the mass ratio of carbon nanotube are 91-95:5-9 in the step (2), the ammonium hydroxide
Concentration is 25-28wt%, and the silane coupling agent quality and barium ferrite and the total mass ratio of carbon nanotube are 4-4.5:1.
Preferably, reaction condition is that stirring is condensed back 2h-5h at 50 DEG C -70 DEG C in the step (3), and drying condition is
40-60 DEG C of vacuum drying 12h-24h.
Preferably, the silane coupling agent is KH550.
Preferably, the preparation of barium ferrite includes: by Fe (NO in the step (1)3)3·9H2O、Ba(NO3)2With a water
Citric acid mixing is soluble in water, and adjusts pH to neutrality, and heating, which is reacted and stands solidification, forms gel, then carries out from climing
Prolong burning and calcining, finally grinding obtains the barium ferrite.
Preferably, the Fe (NO3)3·9H2O and Ba (NO3)2Molar ratio be 1:10.5-11.5, the Citric Acid Mono
Amount be 1.1-1.5 times of amount of iron ion and barium ions total material.
Preferably, the self-propagating combustion is that the gel is put into electric drying oven with forced convection to be heated to 150-180 DEG C,
During heating, the gel expands spontaneous combustion.
Since pure barium ferrite and carbon nanotube only have single suction wave loss mechanisms, barium ferrite only has magnetic hysteresis damage
Consumption, carbon nanotube only have dielectric loss, and two kinds of single materials can not all have more excellent absorbing property, and the two is led to
It crosses preparation method of the invention and carries out the suction wave loss mechanisms compound, both resulting composite wave-suction material will be provided simultaneously with, therefore
Absorbing property is significantly improved.
Compared with the existing technology, the present invention has the following advantages that and gain effect:
(1) complex method of the present invention is simple, at low cost, is easy to industrialized mass production.
(2) composite material in the present invention after doped carbon nanometer pipe is up to -36.6dB to the maximum reflectivity of microwave, and
After compound, wave frequency rate is inhaled toward low frequency movement, the frequency bandwidth of < -10dB (being greater than 90% to the absorption of incidence wave) also has very bright
Aobvious increase, so absorbing property is significantly improved.
Detailed description of the invention
Fig. 1 is the XRD diagram of heretofore described compound absorbing material；
Fig. 2 is heretofore described BaFe12O19Nano particle SEM shape appearance figure；
Fig. 3 is the SEM shape appearance figure of absorbing material of the present invention；
Fig. 4 is the absorbing property figure of heretofore described composite wave-suction material.
Specific embodiment
Method of the invention will be further described by specific example below, but the present invention is not limited only to the reality
Apply example.
Embodiment 1
BaFe of the present invention12O19Preparation, the specific steps are as follows:
(1) it calculates, the material needed for being calculated according to the ratio of the amount of the substance of each element in Magnetoplumbate-type barium ferrite
Quality takes Ba (NO3)2For the quality for calculating unclassified stores on the basis of 0.003mol, the amount of the substance of each material and corresponding can be obtained
Quality, as shown in table 1 below:
1 BaFe of table12O19Preparation in each substance amount
Wherein, the amount of citric acid is selected as 1.1 times of the amount of total metal ion species, it is contemplated that 0.003molBaFe processed12O19。
(2) it weighs and dissolves.The Fe that the corrresponding quality of each substance calculated with electronic balance according to step 1 weighs respectively
(NO3)3·9H2O, Ba (NO3)2And Citric Acid Mono.Then, beaker is added in these three substances, be dissolved in deionized water, stirred
Uniformly.
(3) pH is adjusted to neutrality.Use the concentrated ammonia liquor of 25wt%: the mixed solution regulating step of water=1:1 (volume ratio)
(2) pH value of configured solution.
(4) collosol and gel is converted.By step (3) resulting solution as stirrer in water-bath heater, is added, setting is warm
Degree is 80 DEG C, adjusts mixing speed, carries out moisture evaporation, until the solution in beaker becomes sticky greasy colloidal sol, later,
Standing makes colloidal sol solidify to form gel.
(5) self-propagating combustion.Gel obtained by step (4) is put into electric drying oven with forced convection and is heated, temperature is set
It is 150 DEG C.During heating, gel can expand, and understand spontaneous combustion later, become fluffy coral sprills.This
When, drying oven power supply switch is closed, after cooling, takes out sample, it is with mortar that its is finely ground.
(6) it calcines.Obtained powder is added in crucible, is put into Muffle furnace and is calcined.Temperature curve setting is as follows
Shown in Fig. 1, detailed process are as follows: room temperature → 255min → 850 DEG C → 120min → 850 DEG C → 180min → 200 DEG C → cold with furnace
But.
(7) after the completion of calcining, sample is taken out, is ground, obtains BaFe12O19。
Embodiment 2
BaFe of the present invention12O19Preparation, the specific steps are as follows:
(1) it calculates, the material needed for being calculated according to the ratio of the amount of the substance of each element in Magnetoplumbate-type barium ferrite
Quality takes Ba (NO3)2For the quality for calculating unclassified stores on the basis of 0.003mol, the amount of the substance of each material and corresponding can be obtained
Quality, as shown in table 1 below:
2 BaFe of table12O19Preparation in each substance amount
Wherein, the amount of citric acid is selected as 1.3 times of the amount of total metal ion species, it is contemplated that 0.003molBaFe processed12O19。
(2) it weighs and dissolves.The Fe that the corrresponding quality of each substance calculated with electronic balance according to step 1 weighs respectively
(NO3)3·9H2O, Ba (NO3)2And Citric Acid Mono.Then, beaker is added in these three substances, be dissolved in deionized water, stirred
Uniformly.
(3) pH is adjusted to neutrality.Use the concentrated ammonia liquor of 26.5wt%: the mixed solution of water=1:1 (volume ratio) adjusts step
Suddenly the pH value of (2) configured solution.
(4) collosol and gel is converted.By step (3) resulting solution as stirrer in water-bath heater, is added, setting is warm
Degree is 80 DEG C, adjusts mixing speed, carries out moisture evaporation, until the solution in beaker becomes sticky greasy colloidal sol, later,
Standing makes colloidal sol solidify to form gel.
(5) self-propagating combustion.Gel obtained by step (4) is put into electric drying oven with forced convection and is heated, temperature is set
It is 165 DEG C.During heating, gel can expand, and understand spontaneous combustion later, become fluffy coral sprills.This
When, drying oven power supply switch is closed, after cooling, takes out sample, it is with mortar that its is finely ground.
(6) it calcines.Obtained powder is added in crucible, is put into Muffle furnace and is calcined.Temperature curve setting is as follows
Shown in Fig. 1, detailed process are as follows: room temperature → 255min → 850 DEG C → 120min → 850 DEG C → 180min → 200 DEG C → cold with furnace
But.
(7) after the completion of calcining, sample is taken out, is ground, obtains BaFe12O19。
Embodiment 3
BaFe of the present invention12O19Preparation, the specific steps are as follows:
(1) it calculates, the material needed for being calculated according to the ratio of the amount of the substance of each element in Magnetoplumbate-type barium ferrite
Quality takes Ba (NO3)2For the quality for calculating unclassified stores on the basis of 0.003mol, the amount of the substance of each material and corresponding can be obtained
Quality, as shown in table 1 below:
3 BaFe of table12O19Preparation in each substance amount
Wherein, the amount of citric acid is selected as 1.5 times of the amount of total metal ion species, it is contemplated that 0.003molBaFe processed12O19。
(2) it weighs and dissolves.The Fe that the corrresponding quality of each substance calculated with electronic balance according to step 1 weighs respectively
(NO3)3·9H2O, Ba (NO3)2And Citric Acid Mono.Then, beaker is added in these three substances, be dissolved in deionized water, stirred
Uniformly.
(3) pH is adjusted to neutrality.Use the concentrated ammonia liquor of 28wt%: the mixed solution regulating step of water=1:1 (volume ratio)
(2) pH value of configured solution.
(4) collosol and gel is converted.By step (3) resulting solution as stirrer in water-bath heater, is added, setting is warm
Degree is 80 DEG C, adjusts mixing speed, carries out moisture evaporation, until the solution in beaker becomes sticky greasy colloidal sol, later,
Standing makes colloidal sol solidify to form gel.
(5) self-propagating combustion.Gel obtained by step (4) is put into electric drying oven with forced convection and is heated, temperature is set
It is 180 DEG C.During heating, gel can expand, and understand spontaneous combustion later, become fluffy coral sprills.This
When, drying oven power supply switch is closed, after cooling, takes out sample, it is with mortar that its is finely ground.
(6) it calcines.Obtained powder is added in crucible, is put into Muffle furnace and is calcined.Temperature curve setting is as follows
Shown in Fig. 1, detailed process are as follows: room temperature → 255min → 850 DEG C → 120min → 850 DEG C → 180min → 200 DEG C → cold with furnace
But.
(7) after the completion of calcining, sample is taken out, is ground, obtains BaFe12O19。
Embodiment 4
Preparation method containing barium ferrite composite carbon nanometer tube absorbing material of the invention, composed of the following components:
95%-BaFe12O19, 5%-CNTs, preparation process the following steps are included:
Step A is weighed: being weighed the concentrated ammonia liquor (concentration 25%) of 80ml dehydrated alcohol, 10ml, 4g silane coupling agent is (dense
Degree is 95wt%), i.e., silane coupler solution concentration is 5wt%, is poured into three-necked flask；
Step B, it is compound: to weigh 0.95g barium ferrite powder (obtaining using the preparation method of embodiment 1), 0.05g carbon is received
Mitron pours into above-mentioned three-necked flask；
Stirring: step C above-mentioned three-necked flask is put into 50 DEG C of water-bath, and connects condenser pipe, stirred under water bath condition
Mix condensing reflux processing 2h；
Step D: it filters: aforesaid liquid being subjected to washing filtering using dehydrated alcohol, up to no ammonium hydroxide smell；
Step E: the powder that will filter out is put into 40 DEG C of vacuum ovens and 12h is dried.It finally slightly grinds, obtains
The absorbing material.
Embodiment 5
Preparation method containing barium ferrite composite carbon nanometer tube absorbing material of the invention, composed of the following components:
93%-BaFe12O19, 7%-CNTs, preparation process the following steps are included:
Step A is weighed: being weighed the concentrated ammonia liquor (concentration 26%) of 90ml dehydrated alcohol, 15ml, 4.5g silane coupling agent
(concentration 97wt%), i.e. silane coupler solution concentration are 4.5wt%, are poured into three-necked flask,
Step B, it is compound: to weigh 0.93g barium ferrite powder (obtaining using the preparation method of embodiment 1), 0.07g carbon is received
Mitron pours into above-mentioned three-necked flask；
Stirring: step C above-mentioned three-necked flask is put into 60 DEG C of water-bath, and connects condenser pipe, stirred under water bath condition
Mix condensing reflux processing 3h；
Step D: it filters: aforesaid liquid being subjected to washing filtering using dehydrated alcohol, up to no ammonium hydroxide smell；
Step E: the powder that will filter out is put into 60 DEG C of vacuum ovens and 18h is dried.It finally slightly grinds, obtains
The absorbing material.
Embodiment 6
Preparation method containing barium ferrite composite carbon nanometer tube absorbing material of the invention, composed of the following components:
91%-BaFe12O19, 9%-CNTs, preparation process the following steps are included:
Step A is weighed: being weighed the concentrated ammonia liquor (concentration 28%) of 100ml dehydrated alcohol, 20ml, 4.2g silane coupling agent
(concentration 99wt%), i.e. silane coupler solution concentration are 4wt%, are poured into three-necked flask；
Step B, it is compound: to weigh 0.91g barium ferrite powder (obtaining using the preparation method of embodiment 1), 0.09g carbon is received
Mitron pours into above-mentioned three-necked flask；
Stirring: step C above-mentioned three-necked flask is put into 70 DEG C of water-bath, and connects condenser pipe, stirred under water bath condition
Mix condensing reflux processing 5h；
Step D: it filters: aforesaid liquid being subjected to washing filtering using dehydrated alcohol, up to no ammonium hydroxide smell；
Step E: the powder that will filter out is put into 60 DEG C of vacuum ovens and is dried for 24 hours.It finally slightly grinds, obtains
The absorbing material.
In Fig. 1, B/C is composite wave-suction material of the present invention, available from Fig. 1, composite wave-suction material and pure barium iron
Oxysome has almost the same XRD diffraction maximum, and the barium ferrite particle for showing that the present invention is prepared in Fig. 2 is uniform, in conjunction with Fig. 3
Illustrate that the composite effect of barium ferrite and carbon nanotube is preferable.
Fig. 4 is the suction wave reflection rate figure of barium ferrite and the nano combined resulting materials of different content carbon, and wherein 2-18GHz is
Frequency locating for most of military radar wave, 5%CNTs represent the absorbing property figure of 4 gained composite wave-suction material of embodiment, and 7%
CNTs represents the absorbing property figure of 5 gained absorbing material of embodiment, and 9%CNTs represents the suction wave of 6 gained absorbing material of embodiment
Performance map, BaM are the absorbing property figure of pure barium ferrite, it can be seen that pure barium ferrite at 12.9GHz, has maximum anti-
Rate is penetrated, value is -4.4dB；Adulterate 5%, 7%, 9% carbon nanotube maximum reflectivity be respectively -36.6dB, -20.6dB, -
13.7dB；Obviously, after composite carbon nanometer tube, material is significantly improved to the maximum reflectivity of microwave, and after compound,
It is mobile toward low frequency to inhale wave frequency rate；The frequency bandwidth of < -10dB (being greater than 90% to the absorption of incidence wave), which also has, obviously to be increased
Add, this further illustrates the absorbing property of compound rear material has the promotion of highly significant.
Above-mentioned technical proposal only embodies the optimal technical scheme of technical solution of the present invention, those skilled in the art
The some variations that may be made to certain parts therein embody the principle of the present invention, belong to the scope of protection of the present invention
Within.
Claims (9)
1. the preparation method of a kind of barium ferrite and carbon nano tube composite wave-absorbing material, it is characterised in that: (1) prepare barium iron first
Oxysome；(2) silane coupling agent is added in dehydrated alcohol and ammonium hydroxide, is uniformly mixed and obtains silane coupler solution, then by barium
It is added in silane coupler solution and is reacted after ferrite and carbon nanotube mixing；(3) it is washed after reaction to no ammonium hydroxide
Smell, then filtration drying grinds to obtain the absorbing material.
2. preparation method according to claim 1, it is characterised in that: the concentration of ammonium hydroxide is 25- in the step (2)
The volume ratio of 28wt%, ethyl alcohol and ammonium hydroxide is 5-8:1, and the concentration of the silane coupler solution is 4-5wt%.
3. preparation method according to claim 1, it is characterised in that: barium ferrite and carbon nanotube in the step (2)
Mass ratio be 91-95:5-9, the concentration of the ammonium hydroxide is 25-28wt%, the silane coupling agent quality and barium ferrite and carbon
The total mass ratio of nanotube is 4-4.5:1.
4. preparation method according to claim 1, it is characterised in that: reaction condition is 50 DEG C -70 DEG C in the step (3)
Lower stirring is condensed back 2h-5h, and drying condition is 40-60 DEG C of vacuum drying 12h-24h.
5. preparation method according to claim 1, it is characterised in that: the silane coupling agent is KH550.
6. preparation method according to claim 1, it is characterised in that: in the step (1) preparation of barium ferrite include:
By Fe (NO3)3·9H2O、Ba(NO3)2It is soluble in water with Citric Acid Mono mixing, and pH is adjusted to neutrality, heating is reacted simultaneously
It stands solidification and forms gel, then carry out self-propagating combustion and calcining, finally grinding obtains the barium ferrite.
7. preparation method according to claim 6, it is characterised in that: the Fe (NO3)3·9H2O and Ba (NO3)2Mole
Than for 1:10.5-11.5, the amount of the Citric Acid Mono is 1.1-1.5 times of the amount of iron ion and barium ions total material.
8. preparation method according to claim 6, it is characterised in that: the self-propagating combustion is that the gel is put into electricity
150-180 DEG C is heated in hot blast drying box, during heating, the gel expands spontaneous combustion.
9. barium ferrite and carbon nano tube composite wave-absorbing material that any one of claim 1-8 preparation method obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811525479.5A CN109850950A (en) | 2018-12-13 | 2018-12-13 | A kind of absorbing material and preparation method thereof compound by barium ferrite and carbon nanotube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811525479.5A CN109850950A (en) | 2018-12-13 | 2018-12-13 | A kind of absorbing material and preparation method thereof compound by barium ferrite and carbon nanotube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109850950A true CN109850950A (en) | 2019-06-07 |
Family
ID=66891006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811525479.5A Pending CN109850950A (en) | 2018-12-13 | 2018-12-13 | A kind of absorbing material and preparation method thereof compound by barium ferrite and carbon nanotube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109850950A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500255A (en) * | 2020-03-09 | 2020-08-07 | 四川大学 | Carbon nano tube/barium ferrite magnetic composite powder and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964571A (en) * | 2012-11-12 | 2013-03-13 | 南昌航空大学 | Preparation method of barium ferrite/carbon nanotube/poly(3-methylthiophene) composite wave-absorbing material |
| CN105218807A (en) * | 2015-09-17 | 2016-01-06 | 南京理工大学 | Ferrite composite material that nano polyaniline is coated and preparation method thereof |
| CN107200361A (en) * | 2017-06-29 | 2017-09-26 | 济南大学 | A kind of rGO/Fe2O3The preparation method of nano composite material |
| CN107541185A (en) * | 2017-08-04 | 2018-01-05 | 大连理工大学 | Zinc doping ferrite/Electromagnetic Wave-absorbing Carbon Nanotubes and preparation method thereof |
-
2018
- 2018-12-13 CN CN201811525479.5A patent/CN109850950A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964571A (en) * | 2012-11-12 | 2013-03-13 | 南昌航空大学 | Preparation method of barium ferrite/carbon nanotube/poly(3-methylthiophene) composite wave-absorbing material |
| CN105218807A (en) * | 2015-09-17 | 2016-01-06 | 南京理工大学 | Ferrite composite material that nano polyaniline is coated and preparation method thereof |
| CN107200361A (en) * | 2017-06-29 | 2017-09-26 | 济南大学 | A kind of rGO/Fe2O3The preparation method of nano composite material |
| CN107541185A (en) * | 2017-08-04 | 2018-01-05 | 大连理工大学 | Zinc doping ferrite/Electromagnetic Wave-absorbing Carbon Nanotubes and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 徐分芳: "基于樟脑磺酸诱导手性聚苯胺/铁氧体复合物的制备、表征及吸波性能研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500255A (en) * | 2020-03-09 | 2020-08-07 | 四川大学 | Carbon nano tube/barium ferrite magnetic composite powder and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103304186B (en) | Ferrite-base composite magnetic dielectric antenna substrate material and preparation method thereof | |
| Zhang et al. | Preparation of core shell particles consisting of cobalt ferrite and silica by sol–gel process | |
| CN110079271B (en) | Protein-based carbon/magnetic Fe Co nanoparticle composite wave absorber and preparation method and application thereof | |
| CN106518042B (en) | A kind of spinel-type mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide | |
| CN100574598C (en) | W type ferrite electromagnetic-wave absorbent and preparation method thereof | |
| CN109233740A (en) | The method for preparing Fe/Co/C composite wave-suction material based on modified MOF materials pyrolysis | |
| CN108034408A (en) | A kind of preparation method of graphite alkenyl composite wave-absorbing material | |
| CN107365567A (en) | A kind of absorbing material of carbon fiber surface coated magnetic ferrite nano carbon pipe and its preparation method and application | |
| CN102923785A (en) | Preparation method of CoFe2O4 magnetic nano material | |
| CN107144615A (en) | Mix formaldehyde gas sensor of silver-colored ferric oxide nano-material and preparation method thereof | |
| CN108190876A (en) | A kind of graphene composite absorber and preparation method thereof | |
| Agami et al. | Structural, IR, and magnetic studies of annealed Li-ferrite nanoparticles | |
| CN111171787B (en) | BiFeO 3 /RGO composite wave-absorbing material and preparation method thereof | |
| CN106986991A (en) | The preparation method of polyaniline/expanded perlite/barium ferrite magnetoelectric composites | |
| CN106083024A (en) | A kind of cerium zinc is co-doped with NiFe2o4nano-powder and preparation method thereof | |
| CN102643082A (en) | Preparation method of W-shaped barium ferrite | |
| CN107690271A (en) | Rear-earth-doped barium ferrite magnetoelectric composites preparation method | |
| CN109850950A (en) | A kind of absorbing material and preparation method thereof compound by barium ferrite and carbon nanotube | |
| CN107369510A (en) | A kind of preparation method of low-cost and high-performance compound soft magnetic material | |
| CN101157482B (en) | Modified Ca-Co-O system doped transition metal composite oxides and preparation method thereof | |
| CN106854453A (en) | A kind of preparation method of lamellar composite absorbing material | |
| CN105218807A (en) | Ferrite composite material that nano polyaniline is coated and preparation method thereof | |
| CN104671764B (en) | A kind of niobium doping barium ferrite wave-absorbing powder material and preparation method | |
| CN107032411A (en) | Potassium mixes lanthanum manganate nano wave-absorbing material and preparation method thereof | |
| CN105600834A (en) | Low-cost large-scale preparation method of ferroferric oxide micron magnetic particles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190607 |
|
| RJ01 | Rejection of invention patent application after publication |