CN107604211A - A kind of LaPrCo magnetic microwave absorbing material and preparation method thereof - Google Patents
A kind of LaPrCo magnetic microwave absorbing material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of LaPrCo magnetic microwave absorbing material, it is characterised in that the stoichiometric proportion of its molecular formula is that atomic percent is：La：0‑4.2、Pr：6.3‑10.5、Co：89.5, above-mentioned each component percentage composition sum is 100.The invention also discloses the preparation method of magnetic microwave absorbing material, comprise the following steps：1) dispensing；2) melting；3) homogenization heat treatment；4) coarse crushing；5) ball milling.This magnetic microwave absorbing material has the characteristics that absorption band is wide, wave absorbing efficiency is high, heat endurance is good, high temperature resistant and corrosion resistance and good in 2GHz 18GHz microwave bands.The advantages of this method is that technique is simple, workable, it is easy to accomplish productionization.
Description
Technical field
The present invention relates to magnetic microwave absorbing material field, specifically a kind of LaPrCo magnetic microwave absorbing material and its system
Preparation Method.
Background technology
With the development of modern science and technology, various electronics, electrical equipment provide very high efficiency for social production, give
The daily life of the mankind brings great convenience, but electromagnetic pollution is also expanded therewith, and electromagnetic pollution is by world health
Tissue is classified as the fourth-largest pollution after water pollution, atmosphere pollution, noise pollution.Electromagnetic radiation can cause human central nervous
System disorder and with sympathetic nerve it is tired, it is nervous based on vegetative dystonie, meanwhile, electromagnetic radiation can also be set to electronics
It is standby to produce harmful effect.The high frequency radiation that high-frequency apparatus is formed during working can be to the instrument and meter around it, communication signal etc.
Severe jamming is produced, or even is not normally functioning it.Therefore, how to reduce electromagnetic radiation turns into the focus of social concerns.
Absorbing material be one kind can effective electromagnetic wave absorption, and electromagnetic energy is changed by the various loss mechanisms of material
Into heat energy or a kind of material of other energy.In general, absorbing material needs to meet two kinds of characteristics, first, making electromagnetic wave maximum
It is matching properties to enter material internal to degree, second, it is special that i.e. decay is rapidly dampened when incident electromagnetic wave is by inhaling ripple layer
Property.For dielectric class absorbing material, electromagnetic wave absorbing material because its preferable impedance matching property and magnetic loss ability by
More concerns.At present the electromagnetic wave absorbing material developed mainly have ferrimagnetism absorbing material, micro-, ultramicro magnetic metal and
Chemical combination between alloy powder electromagnetic wave absorbing material, polycrystalline iron fiber electromagnetic wave absorbing material, nano-magnetic absorbing material and rare earth metal
Thing electromagnetic wave absorbing material.Ferrite is as current widely used absorbing material, because its saturation magnetization is low, absorption band
Narrow, the shortcomings of dielectric loss is small, density is big, corrosion-resistant, limit its application in particular range, and sheet soft magnetic metal
Micro mist has high-curie temperature, high-temperature stability, and high saturation and magnetic intensity, can be obtained in 2-18GHz band limits
Higher magnetic loss and relatively low eddy-current loss are obtained, there is good application prospect as absorbing material.Apply at present at most
Magnetically soft alloy micro mist is mainly Fe, Co, Ni and its alloy powder etc..
Co member procatarxis has the features such as high saturation and magnetic intensity, high-curie temperature, high magnetic permeability, low-coercivity, make its
Still there are higher magnetic loss and electromagnetic wave absorption performance under higher temperature, but Co base magnetic materials are also because absorption band is narrow, it is strong to inhale ripple
The shortcomings of degree is not strong enough, density is big, limits some applications.Rare earth element has unique 3d-4f track structures, this
Class formation enables layer 5 electron shell to shield the 4th layer of electronics well, so there are rare earth element many elements not have
Light, electricity, the performance such as magnetic, be described as new material " treasure-house ".Appropriate rare earth element is added in Co based alloys, suitably to compare
Example proportioning, can effectively improve its microwave absorbing property, and have preferable frequency range effect.
The content of the invention
The purpose of the present invention is face the deficiencies in the prior art, and provide a kind of LaPrCo magnetic microwave absorbing material and its
Preparation method.This magnetic microwave absorbing material in 2GHz-18GHz microwave bands have absorption band is wide, wave absorbing efficiency is high,
Heat endurance is good, high temperature resistant and the features such as corrosion resistance and good.The advantages of this method is that technique is simple, workable, easily
In realization productionization.
Realizing the technical scheme of the object of the invention is：
A kind of LaPrCo electromagnetic wave absorbing materials, the stoichiometric proportion of its molecular formula is that atomic percent is：La：0-4.2、
Pr：6.3-10.5、Co：89.5, above-mentioned each component percentage composition sum is 100.
A kind of preparation method of LaPrCo electromagnetic wave absorbing materials, comprises the following steps：
1) dispensing：Using La, Pr, Co metal of purity >=99.90% as raw material, stoichiometrically La0-4.2Pr6.3- 10.5Co89.5System matches somebody with somebody sample；
2) melting：By the made sample the matched somebody with somebody melting under argon gas or vacuum protection of step 1), ingot casting is obtained；
3) homogenization heat treatment：Melted ingot casting is carried out uniformly under vacuum or argon gas protection in 800 DEG C -1100 DEG C
Change heat treatment, obtain alloy pig；
4) coarse crushing：The alloy pig that step 3) is obtained crushes and is milled into coarse powder；
5) ball milling：The coarse powder that step 4) is obtained carries out ball milling, and LaPrCo electromagnetic wave absorbing materials are made.
Melting described in step 2) is carried out in the non-consumable arc furnace of standard, in order to ensure the composition of alloy
Uniformity, sample need to be overturn melting 3-4 times.
Homogenization heat treatment described in step 3) includes insulation 5-15 days, carries out ice water quenching process afterwards.
Homogenization heat treatment temperature described in step 3) is 900 DEG C.
Coarse powder described in step 4), in 200 mesh sieves, granularity is less than 0.5mm.
Ball milling described in step 5) is ball powder-grinding, and ball milling, zirconia ball and coarse powder are carried out using planetary ball mill
By 15:1-20:1 mass ratio is put into zirconium oxide tank, is added absolute ethyl alcohol and is made protective agent, Ball-milling Time 15h-30h, rotating speed
For 300-350 revs/min.
The Product checking of magnetic microwave absorbing material prepared by the above method：The electromagnetic parameter of product is detected as follows
With calculating reflectivity R：
By LaPrCo alloy powders：Paraffin=4:The ratio mixing of 1 (mass ratio), it is respectively 7mm that external diameter and internal diameter, which is made,
And 3mm, thickness are 2.5mm-3.5mm or so coaxial sample, are measured respectively using HP8722ES microwave vector network analyzers
Complex permeability, complex dielectric permittivity of the sample in 2GHz-18GHz frequency ranges, the reflectivity of single-layer absorber is calculated using following formula
R：
In formula：K is propagation constantZ is wave impedancez0For the wave impedance of vacuum, μ0、ε0It is respectively space permeability, vacuum Jie with d
Electric constant and microwave absorbing coating thickness, ε ' and ε " are the real part of complex dielectric permittivity, imaginary part respectively, and μ ' and μ " are respectively complex permeability
Real part, imaginary part.
Testing result, using the LaPrCo alloy electromagnetic wave absorbing materials of the technical program, when LaPrCo alloy powders and stone
Wax presses 4:1 ratio (mass ratio) is mixed into compound, and in 2GHz-18GHz microwave bands, microwave absorbing coating thickness is in 1.2mm-
Between 3.8mm, compound is respectively less than -10dB to the reflectivity minimum peak of microwave, and has preferable wideband effect；Work as compound
When thickness is 1.6mm, can reach -44.27dB to the reflectance peak minimum of microwave in 10.32GHz frequency ranges, (absorptivity can reach
99.99%), in C-band (4GHz-8GHz), La0.5Pr1.0Co89.5Powder when thickness is 3.8mm, also may be used by minimum reflectance
To reach -30.84dB (absorptivity up to 99.91%).
This magnetic microwave absorbing material in 2GHz-18GHz microwave bands have absorption band is wide, wave absorbing efficiency is high,
Heat endurance is good, high temperature resistant and the features such as corrosion resistance and good.The advantages of this method is that technique is simple, workable, easily
In realization productionization.
Brief description of the drawings
Fig. 1 is the preparation method process flow diagram of the embodiment of the present invention；
Fig. 2 is Pr10.5Co89.5Alloy electromagnetic wave absorbing material tests reflectivity results schematic diagram；
Fig. 3 is La0.5Pr10Co89.5Alloy electromagnetic wave absorbing material tests reflectivity results schematic diagram；
Fig. 4 is La1.05Pr9.45Co89.5Alloy electromagnetic wave absorbing material tests reflectivity results schematic diagram；
Fig. 5 is La2.10Pr8.4Co89.5Alloy electromagnetic wave absorbing material tests reflectivity results schematic diagram；
Fig. 6 is La4.2Pr6.3Co89.5Alloy electromagnetic wave absorbing material tests reflectivity results schematic diagram.
Embodiment
Present invention is further elaborated with reference to the accompanying drawings and examples, but is not limitation of the invention.
Embodiment 1：
Reference picture 1, prepare Pr10.5Co89.5The preparation method of atomic percent electromagnetic wave absorbing material, comprises the following steps：
1) dispensing：By by purity >=99.90% La, Pr, Co metal, by Pr10.5Co89.5Stoichiometric proportion dispensing；
2) melting：The melting in non-consumable arc furnace under argon gas protection, in order to ensure that the composition of alloy is uniform, instead
Melting 3-4 times is overturn again；
3) homogenization heat treatment：By melted ingot casting vacuum preservation in quartz ampoule, 15 days are incubated at a temperature of 800 DEG C
Ice water quenching afterwards；
4) coarse crushing：Obtained alloy pig is broken into the coarse powder that granularity is respectively less than 0.5mm, the rear mesh sieve of mistake 200；
5) ball milling：Zirconia ball and coarse powder are pressed 15:1 mass ratio is put into zirconium oxide tank, is added absolute ethyl alcohol and is gone bail for
Agent is protected, with QM-lSP planetary ball mills to alloy coarse powder ball milling 15 hours, drum's speed of rotation is 300 revs/min.
Product test:By alloy powder:Paraffin=4:The ratio mixing of 1 (mass ratio), is made external diameter and internal diameter is respectively
7mm and 3mm, thickness 2.5mm-3.5mm or so coaxial sample, is measured respectively using HP8722ES microwave vector network analyzers
Complex permeability, the complex dielectric permittivity of sample 2GHz-18GHz frequency ranges, single-layer absorber is then gone out using following formula calculating simulation and existed
Thickness is respectively 1.7mm, 1.9mm, 2.2mm, 2.4mm, 2.5mm reflectivity R：
In formula：K is propagation constantZ is wave impedancez0For the wave impedance of vacuum, μ0、ε0It is respectively space permeability, vacuum Jie with d
Electric constant and microwave absorbing coating thickness, ε ' and ε " are the real part of complex dielectric permittivity, imaginary part respectively, and μ ' and μ " are respectively complex permeability
Real part, imaginary part.
The performance test results：
If Fig. 2 is Pr10.5Co89.5/ paraffin compound [powder:Paraffin=4:1 (mass ratio)] in 2GHz-18GHz microwave ripples
Reflectivity when thickness is respectively 1.7mm, 1.9mm, 2.2mm, 2.4mm, 2.5mm in section.It can be obtained from figure：Work as in all thickness
In, the absorption peak of compound is respectively less than -10dB, and absorptivity is more than 90%, has preferable wideband effect；When the thickness of compound
Spend for 1.9mm when, at 9.84GHz frequencies minimum reflectance peak value be about -38.80dB.In addition, compound is in 4GHz-8GHz
Frequency range, when thickness is 2.4mm, minimum reflectance can also reach -12.21GHz (absorptivity can reach 93.98%), and<-
10dB frequency range reaches 1.52GHz.
Embodiment 2：
Reference picture 1, prepare La0.5Pr10Co89.5The preparation method of atomic percent electromagnetic wave absorbing material, including following step
Suddenly：
1) dispensing：By by purity >=99.90% La, Pr, Co metal, by La0.5Pr10Co89.5Stoichiometric proportion is matched somebody with somebody
Material；
2) melting：The melting in non-consumable arc furnace under argon gas protection, in order to ensure that the composition of alloy is uniform, instead
Melting 3-4 times is overturn again；
3) homogenization heat treatment：By melted ingot casting vacuum preservation in quartz ampoule, 10 days are incubated at a temperature of 900 DEG C
Ice water quenching afterwards；
4) coarse crushing：Obtained alloy pig is broken into the coarse powder that granularity is respectively less than 0.5mm, the rear mesh sieve of mistake 200；
5) ball milling：Zirconia ball and coarse powder are pressed 15:1 mass ratio is put into zirconium oxide tank, is added absolute ethyl alcohol and is gone bail for
Agent is protected, with QM-lSP planetary ball mills to alloy coarse powder ball milling 20 hours, drum's speed of rotation is 320 revs/min.
Product test：By alloy powder:Paraffin=4:The ratio mixing of 1 (mass ratio), is made external diameter and internal diameter is respectively
7mm and 3mm, thickness 2.5mm-3.5mm or so coaxial sample, is measured respectively using HP8722ES microwave vector network analyzers
Complex permeability, the complex dielectric permittivity of sample 2GHz-18GHz frequency ranges, single-layer absorber is then gone out using following formula calculating simulation and existed
Thickness is respectively 2.4mm, 2.8mm, 3.0mm, 3.6mm, 3.8mm reflectivity R：
In formula：K is propagation constantZ is wave impedancez0For the wave impedance of vacuum, μ0、ε0It is respectively space permeability, vacuum Jie with d
Electric constant and microwave absorbing coating thickness, ε ' and ε " are the real part of complex dielectric permittivity, imaginary part respectively, and μ ' and μ " are respectively complex permeability
Real part, imaginary part.
The performance test results：
Fig. 3 is La0.5Pr10Co89.5/ paraffin compound [powder:Paraffin=4:1 (mass ratio)] in 2GHz-18GHz microwaves
Reflectivity when thickness is respectively 2.4mm, 2.8mm, 3.0mm, 3.6mm, 3.8mm in wave band.It can be obtained from figure：In all thickness
Central, the absorption peak of compound is respectively less than -10dB, has preferable wideband effect；In C-band (4GHz-8GHz) compound
With preferable microwave absorption effect, when composite thickness is 3.8mm, 4.16GHz reflections at frequencies rates peak value about-
30.84dB and<- 10dB frequency range reaches 0.64GHz, has preferable absorbing property in low-frequency range.
Embodiment 3：
Reference picture 1, prepare La1.05Pr9.45Co89.5The preparation method of atomic percent magnetic microwave absorbing material, including such as
Lower step：
1) dispensing：By by purity >=99.90% La, Pr, Co metal, by La1.05Pr9.45Co89.5Stoichiometric proportion is matched somebody with somebody
Material；
2) melting：The melting in non-consumable arc furnace under argon gas protection, in order to ensure that the composition of alloy is uniform, instead
Melting 3-4 times is overturn again；
3) homogenization heat treatment：Frozen water after melted ingot casting is incubated into 7 days at a temperature of 1000 DEG C under vacuum protection
Quenching；
4) coarse crushing：Obtained alloy pig is broken into the coarse powder that granularity is respectively less than 0.5mm, the rear mesh sieve of mistake 200；
5) ball milling：Zirconia ball and coarse powder are pressed 20:1 mass ratio is put into zirconium oxide tank, is added absolute ethyl alcohol and is gone bail for
Agent is protected, with QM-lSP planetary ball mills to alloy coarse powder ball milling 24 hours, drum's speed of rotation is 320 revs/min.
Product test：By alloy powder:Paraffin=4:The ratio mixing of 1 (mass ratio), is made external diameter and internal diameter is respectively
7mm and 3mm, thickness 2.5mm-3.5mm or so coaxial sample, is measured respectively using HP8722ES microwave vector network analyzers
Complex permeability, the complex dielectric permittivity of sample 2GHz-18GHz frequency ranges, single-layer absorber is then gone out using following formula calculating simulation and existed
Thickness is respectively 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm reflectivity R：
In formula：K is propagation constantZ is wave impedancez0For the wave impedance of vacuum, μ0、ε0It is respectively space permeability, vacuum Jie with d
Electric constant and microwave absorbing coating thickness, ε ' and ε " are the real part of complex dielectric permittivity, imaginary part respectively, and μ ' and μ " are respectively complex permeability
Real part, imaginary part.
Fig. 4 is La1.05Pr9.45Co89.5/ paraffin compound [powder:Paraffin=4:1 (mass ratio)] it is micro- in 2GHz-18GHz
Reflectivity when thickness is respectively 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm in ripple wave band.It can be obtained from figure：
Among all thickness, the absorption peak of compound is respectively less than -10dB, has preferable wideband effect；When composite thickness is
During 1.6mm, it is about -44.27dB in 10.32GHz reflections at frequencies rates peak value, there is preferable microwave absorption effect.
Embodiment 4：
Reference picture 1, prepare La2.10Pr8.4Co89.5The preparation method of atomic percent magnetic microwave absorbing material, including such as
Lower step：
1) dispensing：By by purity >=99.90% La, Pr, Co metal, by La2.10Pr8.4Co89.5Stoichiometric proportion is matched somebody with somebody
Material；
2) melting：The melting in non-consumable arc furnace under argon gas protection, in order to ensure that the composition of alloy is uniform, instead
Melting 3-4 times is overturn again；
3) homogenization heat treatment：Frozen water after melted ingot casting is incubated into 7 days at a temperature of 1050 DEG C under vacuum protection
Quenching；
4) coarse crushing：Obtained alloy pig is broken into the coarse powder that granularity is respectively less than 0.5mm, the rear mesh sieve of mistake 200；
5) ball milling：Zirconia ball and coarse powder are pressed 20:1 mass ratio is put into zirconium oxide tank, is added absolute ethyl alcohol and is gone bail for
Agent is protected, with QM-lSP planetary ball mills to alloy coarse powder ball milling 30 hours, drum's speed of rotation is 350 revs/min.
Product test：By alloy powder:Paraffin=4:The ratio mixing of 1 (mass ratio), is made external diameter and internal diameter is respectively
7mm and 3mm, thickness 2.5mm-3.5mm or so coaxial sample, is measured respectively using HP8722ES microwave vector network analyzers
Complex permeability, the complex dielectric permittivity of sample 2GHz-18GHz frequency ranges, single-layer absorber is then gone out using following formula calculating simulation and existed
Thickness is respectively 1.4mm, 1.6mm, 2.0mm, 2.2mm reflectivity R：
In formula：K is propagation constantZ is wave impedancez0For the wave impedance of vacuum, μ0、ε0It is respectively space permeability, vacuum Jie with d
Electric constant and microwave absorbing coating thickness, ε ' and ε " are the real part of complex dielectric permittivity, imaginary part respectively, and μ ' and μ " are respectively complex permeability
Real part, imaginary part.
Fig. 5 is La2.10Pr8.4Co89.5/ paraffin compound [powder:Paraffin=4:1 (mass ratio)] in 2-18GHz microwave ripples
Reflectivity when thickness is respectively 1.4mm, 1.6mm, 2.0mm, 2.2mm in section.It can be obtained from figure：It is multiple among all thickness
The absorption peak of compound is respectively less than -10dB, and absorptivity is more than 90%, is respectively provided with preferable wideband effect；When composite thickness is
During 1.4mm, it is about -35.44dB in 11.36GHz reflections at frequencies rates peak value, there is preferable wideband microwave absorption effect.
Embodiment 5：
Reference picture 1, prepare La4.2Pr6.3Co89.5The preparation method of atomic percent magnetic microwave absorbing material, including such as
Lower step：
1) dispensing：By by purity >=99.90% La, Pr, Co metal, by La4.2Pr6.3Co89.5Stoichiometric proportion is matched somebody with somebody
Material；
2) melting：The melting in non-consumable arc furnace under argon gas protection, in order to ensure that the composition of alloy is uniform, instead
Melting 3-4 times is overturn again；
3) homogenization heat treatment：By melted ingot casting vacuum preservation in quartz ampoule, after being incubated 5 days at a temperature of 1100 DEG C
Ice water quenching；
4) coarse crushing：Obtained alloy pig is broken into the coarse powder that granularity is respectively less than 0.5mm, the rear mesh sieve of mistake 200；
5) ball milling：Zirconia ball and coarse powder are pressed 15:1 mass ratio is put into zirconium oxide tank, is added absolute ethyl alcohol and is gone bail for
Agent is protected, with QM-lSP planetary ball mills to alloy coarse powder ball milling 30 hours, drum's speed of rotation is 350 revs/min.
Product test：By alloy powder:Paraffin=4:The ratio mixing of 1 (mass ratio), is made external diameter and internal diameter is respectively
7mm and 3mm, thickness 2.5mm-3.5mm or so coaxial sample, is measured respectively using HP8722ES microwave vector network analyzers
Complex permeability, the complex dielectric permittivity of sample 2GHz-18GHz frequency ranges, single-layer absorber is then gone out using following formula calculating simulation and existed
Thickness is respectively 1.7mm, 1.9mm, 2.1mm, 2.3mm reflectivity R：
In formula：K is propagation constantZ is wave impedancez0For the wave impedance of vacuum, μ0、ε0It is respectively space permeability, vacuum Jie with d
Electric constant and microwave absorbing coating thickness, ε ' and ε " are the real part of complex dielectric permittivity, imaginary part respectively, and μ ' and μ " are respectively complex permeability
Real part, imaginary part.
Fig. 6 is La4.2Pr6.3Co89.5/ paraffin compound [powder:Paraffin=4:1 (mass ratio)] in 2-18GHz microwave ripples
Reflectivity when thickness is respectively 1.7mm, 1.9mm, 2.1mm, 2.3mm in section.It can be obtained from figure：It is multiple among all thickness
The absorption peak of compound is respectively less than -10dB, and absorptivity is more than 90%, is respectively provided with preferable wideband effect；When composite thickness is
It is about -13.21dB in 9.36GHz reflections at frequencies rates peak value during 1.7mm, and<- 10dB frequency range reaches 1.6GHz.In C
Wave band, when composite thickness is 2.1mm, minimum reflectance peak value is about -11.85Db, and absorptivity reaches 93.47%.
Claims (7)
1. a kind of LaPrCo magnetic microwave absorbing material, it is characterised in that the stoichiometric proportion of its molecular formula is atomic percent
For：La：0-4.2、Pr：6.3-10.5、Co：89.5, above-mentioned each component percentage composition sum is 100.
2. a kind of preparation method of LaPrCo magnetic microwave absorbing material, it is characterised in that comprise the following steps：
1) dispensing：Using La, Pr, Co metal of purity >=99.90% as raw material, stoichiometrically La0-4.2Pr6.3-10.5Co89.5
System matches somebody with somebody sample；
2) melting：By the made sample the matched somebody with somebody melting under argon gas or vacuum protection of step 1), ingot casting is obtained；
3) homogenization heat treatment：Melted ingot casting is subjected to homogenization heat in 800 DEG C -1100 DEG C under vacuum or argon gas protection
Processing, obtains alloy pig；
4) coarse crushing：The alloy pig that step 3) is obtained crushes and is milled into coarse powder；
5) ball milling：The coarse powder that step 4) is obtained carries out ball milling, and LaPrCo electromagnetic wave absorbing materials are made.
3. preparation method according to claim 2, it is characterised in that the melting described in step 2) be standard it is non-from
Carried out in consumption vacuum arc furnace ignition, sample need to be overturn melting 3-4 times.
4. preparation method according to claim 2, it is characterised in that the homogenization heat treatment described in step 3) includes protecting
Warm 5-15 days, ice water quenching process was carried out afterwards.
5. preparation method according to claim 2, it is characterised in that the homogenization heat treatment temperature described in step 3) is
900℃。
6. preparation method according to claim 2, it is characterised in that the coarse powder described in step 4), in 200 mesh sieve mistakes
Sieve, granularity are less than 0.5mm.
7. preparation method according to claim 2, it is characterised in that the ball milling described in step 5) is ball powder-grinding, is adopted
Ball milling is carried out with planetary ball mill, zirconia ball and coarse powder press 15:1-20:1 mass ratio is put into zirconium oxide tank, adds nothing
Water-ethanol makees protective agent, Ball-milling Time 15h-30h, and rotating speed is 300-350 revs/min.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0660338A1 (en) * | 1993-12-27 | 1995-06-28 | The Foundation: The Research Institute Of Electric And Magnetic Alloys | Permanent magnet material of high coercive force Pr-Co alloy and permanent magnet material of thin film and method of manufacturing the same |
| CN102839301A (en) * | 2012-09-14 | 2012-12-26 | 中国科学院宁波材料技术与工程研究所 | Rare earth coblat-based alloy, alloy powder and manufacturing method of alloy and alloy powder |
-
2017
- 2017-09-21 CN CN201710857453.XA patent/CN107604211A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0660338A1 (en) * | 1993-12-27 | 1995-06-28 | The Foundation: The Research Institute Of Electric And Magnetic Alloys | Permanent magnet material of high coercive force Pr-Co alloy and permanent magnet material of thin film and method of manufacturing the same |
| CN102839301A (en) * | 2012-09-14 | 2012-12-26 | 中国科学院宁波材料技术与工程研究所 | Rare earth coblat-based alloy, alloy powder and manufacturing method of alloy and alloy powder |
Non-Patent Citations (2)
| Title |
|---|
| HE CHONGKANG ET AL: ""Effect of rare earths on microwave absorbing properties of RE-Co alloys"", 《JOURNAL OF EARTHS》 * |
| S.H. ZHOU ET AL: ""Thermodynamic database for the Co-Pr system"", 《DATA IN BRIEF》 * |
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