CN104774008B - A kind of medium dielectric constant microwave medium ceramics as low-loss microwave medium and preparation method thereof - Google Patents
A kind of medium dielectric constant microwave medium ceramics as low-loss microwave medium and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of medium dielectric constant microwave medium ceramics as low-loss microwave medium, the ceramic composition expression formula is Zr(1‑x)(Mg1/ 3Nb2/3)xTiO4+ ywt%MnCO3, wherein 0.325≤x≤0.4,0.2≤y≤0.5, y is MnCO3Account for Zr(1‑x)(Mg1/3Nb2/3)xTiO4Mass percent, the present invention correspondingly provide a kind of preparation method of medium dielectric constant microwave medium ceramics as low-loss microwave medium.The medium dielectric constant microwave medium ceramics as low-loss microwave medium that the present invention is provided, sintering temperature is relatively low, with compared with high relative dielectric constant and quality factor, and temperature coefficient of resonance frequency levels off to zero, this kind of ceramics can be used as the dielectric material such as radio frequency multilayer ceramic capacitor, chip microwave dielectric resonator or wave filter, ceramic antenna, multi-chip module.
Description
Technical field
The present invention relates to materials science field, more particularly to a kind of medium dielectric constant microwave medium ceramics as low-loss microwave medium and
Its preparation method.
Background technology
Microwave-medium ceramics are a kind of new ceramic materials grown up for nearly more than 20 years.It refers to be applied to
As dielectric material and the potteries of one or more functions is completed in microwave frequency band (mainly 300MHz~300GHz frequency ranges) circuit
Ceramic material, is the critical material for manufacturing microwave dielectric filter resonator.This material is in recent decades with mobile logical
The new function ceramic material for developing rapidly and growing up of letter cause, its outstanding feature is that dielectric constant is high, it is low, humorous to be lost
Vibration frequency temperature coefficient is small, and is used to that dielectric resonator, diectric antenna, duplexer, medium wave circuit, medium frequency stabilization is made
The microwave components such as oscillator.
At present, these devices have been widely used in micro multi-channel communication, microwave radio relay communication, mobile communication, satellite electricity
Depending on various fields such as broadcast communication, scatter communication, military radar and satellite navigation and location systems.Benefit from recent years mobile logical
The fast development in the fields such as letter, space flight, military affairs, modern medicine, microwave dielectric ceramic materials are also increasingly paid close attention to by people,
Just developed rapidly with surprising speed.
In summary, as microwave-medium ceramics are widely used in dielectric resonator, wave filter, Medium Wave Guide, medium base
The field such as plate and medium Meta Materials, therefore, finds, prepares and research high-k (εr＞ 40), low-loss (Qf ＞
5000GHz), near-zero resonance frequency temperature coefficient (TCF=0ppm/ DEG C), inexpensive (being free of or containing a small amount of precious metal),
It is current that the Novel microwave dielectric ceramic of environmentally friendly (at least unleaded, to be free of as far as possible or containing less poisonous raw material) becomes people
The focus and emphasis of research.
At present, the microwave ceramic material system of medium dielectric constant microwave medium mainly has BaTi4O9/Ba2Ti9O20System, (Zr, Sn)
TiO4、BiNbO4System etc., but it is relatively low (be less than 40) to there is relative dielectric constant, sintering temperature or temperature coefficient of resonance frequency mistake
High the problems such as, make the production of microwave ceramic material and utilize to be restricted.
The content of the invention
Based on above mentioned problem, it is an object of the present invention to provide a kind of medium dielectric constant microwave medium ceramics as low-loss microwave medium, the ceramics
Material relative dielectric constant is higher, and microwave property is good, and temperature coefficient of resonance frequency is close to zero.
, should another object of the present invention is to provide a kind of preparation method of medium dielectric constant microwave medium ceramics as low-loss microwave medium
Operation is simple for method.
In order to overcome the deficiencies in the prior art, the technical scheme that the present invention is provided is：
A kind of medium dielectric constant microwave medium ceramics as low-loss microwave medium, the ceramic composition expression formula is Zr(1-x)(Mg1/3Nb2/3)xTiO4+ ywt%MnCO3, wherein 0.325≤x≤0.4,0.2≤y≤0.5, y is MnCO3Account for Zr(1-x)(Mg1/3Nb2/3)xTiO4's
Mass percent.
Further, the ceramic relative dielectric constant is 39.5~46.2, quality factor q f=23300GHz~
43500GHz, temperature coefficient of resonance frequency is=14.2ppm/ DEG C~-0.9ppm/ DEG C.
For another object of the present invention, the present invention also provides a kind of system of medium dielectric constant microwave medium ceramics as low-loss microwave medium
Preparation Method, comprises the following steps：
(1) by composition expression formula Zr of the carbonate of zirconium, magnesium, niobium, titanyl compound and manganese according to ceramics(1-x)(Mg1/ 3Nb2/3)xTiO4+ ywt%MnCO3Abundant ball milling after dispensing mixing is carried out, then dries, sieve and be pressed into blocks, then
4h is incubated at 1000 DEG C, sample burning block is obtained；
(2) abundant ball milling after sample burning block made from step (1) is crushed, then dries, granulates, sieves, after sieving
Particle it is compressing, then at 1180 DEG C~1280 DEG C sinter 2h into porcelain, obtain medium dielectric constant microwave medium low-loss microwave dielectric
Ceramics.
It is preferred that, the zirconium, magnesium, niobium, the carbonate of titanyl compound and manganese are respectively ZrO2、MgO、Nb2O5、TiO2With
MnCO3。
It is preferred that, the Ball-milling Time in the step (1) and the step (2) during ball milling is 4h~5h, the step (1)
It it is 100 DEG C~120 DEG C with the drying temperature in the step (2).
It is preferred that, using the screen cloth of 120 mesh when being sieved in the step (1), sieving is double-deck mistake in the step (2)
Sieve, use for 60 mesh and the screen cloth of 120 mesh.
It is preferred that, micron-size spherical is made after powder is mixed with polyvinyl alcohol water solution when being granulated in the step (2)
Particle.
It is preferred that, the sintering in the step (2) is carried out in air atmosphere.
Compared with prior art, it is an advantage of the invention that：
1. technical scheme is used, with ZrTiO4Based on Rutile Type, wherein Zr4+With (Mg1/3Nb2/3)4+It is multiple
Close ion and occupy A, Ti jointly4+Ion occupies B, compound ion (Mg1/3Nb2/3)4+Can be completely into ZrTiO4Crystalline formation
Solid solution, passes through the Mn that adulterates2+Ion makes Zr(1-x)(Mg1/3Nb2/3)xTiO4Ceramics can be sintered in air atmosphere, sintering
Temperature is relatively low, and obtained ceramic dielectric constant is higher, microwave property is good, temperature coefficient of resonance frequency levels off to zero；
2. the technical solution adopted by the present invention, chooses starting oxides and carbonate, causes oxide by a ball milling
Uniformly mixed with carbonate, then oxide and carbonate is carried out initial reaction by pre-sintering, refined by secondary ball milling
The size of reaction zone particle, ceramics sample is obtained finally by sintering, and operation is simple for the preparation method, obtained microwave pottery
Porcelain properties of sample is superior.
Embodiment
Such scheme is described further below in conjunction with specific embodiment.It should be understood that these embodiments are to be used to illustrate
The present invention and be not limited to limit the scope of the present invention.The implementation condition used in embodiment can be done according to the condition of specific producer
Further adjustment, unreceipted implementation condition is usually the condition in normal experiment.
The method of testing used in the present invention
Under microwave frequency band, accurate measurement low-loss material dielectric properties the best way is dielectric resonator method at present.It
Measurement sensitivity it is high, test is accurate, by Agilent 8720ES Network Analyzers (frequency range is 50MHz~20GHz)
The quality factor of material, i.e. media samples can be accurately measured by enclosed Resonant-cavity Method by low-k, low-loss poly-
Tetrafluoroethene pillar is supported, and is placed in metallic shield intracavitary, and whole test system is encouraged by probe coupling ring.Draw this after tested
When there is unique resonance peak, as TE011Pattern；After lid upper chamber cover, the resonance peak of other patterns can be moved, and
TE011The resonance peak movement of pattern is little.Determine TE011The shape of resonance peak is carefully adjusted behind mode resonances peak, is made up to most
Good couple state, then reads TE011The center resonant frequency f at mode resonances peak0, have load QLValue and insertion loss, by calculating
Software draws the relative dielectric constant and Q × f values of microwave-medium ceramics.
With the Delta Design type high/low temperature circulating boxes of Delta 9023 produced and Network Analyzer test resonant frequency
Temperature coefficient τf.Test fixture is put into high-low temperature chamber, its resonant frequency at 25 DEG C is surveyed, 85 DEG C is then heated to it,
Its resonant frequency at 85 DEG C is surveyed, the temperature coefficient of resonance frequency τ of sample is calculated according to formula (1)f.Specific conversion relation by
(1) formula is provided：
In formula, f25The resonant frequency of sample, f when representing 25 DEG C85The resonant frequency of sample when representing 85 DEG C.
Embodiment 1
According to ceramics composition expression formula Zr0.675(Mg1/3Nb2/3)0.325TiO4+ 0.2wt%MnCO3Weigh raw material ZrO2、
MgO、Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C,
Briquetting after 120 eye mesh screens is crossed, 4h is incubated under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；After sample burning block is crushed
Secondary ball milling is carried out, Ball-milling Time is 5h, dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, is made
Micron-sized spheric granules, the screen cloth bilayer sieving through 60 mesh and 120 mesh, obtains porcelain needed for 60 mesh to 120 purposes, by porcelain
It is compressing, 2h is sintered under 1280 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=41.5 (5.82GHz), quality
TCF=-14.2ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=4000, Qf=23300GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 2
According to ceramics composition expression formula Zr0.675(Mg1/3Nb2/3)0.325TiO4+ 0.5wt%MnCO3Weigh raw material ZrO2、
MgO、Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C,
Briquetting after 120 eye mesh screens is crossed, 4h is incubated under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；After sample burning block is crushed
Secondary ball milling is carried out, Ball-milling Time is 5h, dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, is made
Micron-sized spheric granules, the screen cloth bilayer sieving through 60 mesh and 120 mesh, obtains porcelain needed for 60 mesh to 120 purposes, by porcelain
It is compressing, 2h is sintered under 1280 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=42.9 (5.66GHz), quality
TCF=-13.2ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=7350, Qf=41600GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 3
According to ceramics composition expression formula Zr0.65(Mg1/3Nb2/3)0.35TiO4+ 0.2wt%MnCO3Weigh raw material ZrO2、MgO、
Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C, cross 120
Briquetting after eye mesh screen, is incubated 4h under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；Carried out after sample burning block is crushed
Secondary ball milling, Ball-milling Time is 5h, is dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, micron is made
The spheric granules of level, the screen cloth bilayer sieving through 60 mesh and 120 mesh, porcelain needed for obtaining 60 mesh to 120 purposes suppresses porcelain
Shaping, 2h is sintered under 1260 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=42.2 (5.88GHz), quality
TCF=-13.5ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=7400, Qf=43500GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 4
According to ceramics composition expression formula Zr0.65(Mg1/3Nb2/3)0.35TiO4+ 0.4wt%MnCO3Weigh raw material ZrO2、MgO、
Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C, cross 120
Briquetting after eye mesh screen, is incubated 4h under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；Carried out after sample burning block is crushed
Secondary ball milling, Ball-milling Time is 5h, is dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, micron is made
The spheric granules of level, the screen cloth bilayer sieving through 60 mesh and 120 mesh, porcelain needed for obtaining 60 mesh to 120 purposes suppresses porcelain
Shaping, 2h is sintered under 1260 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=42.3 (5.87GHz), quality
TCF=-13.3ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=7260, Qf=42600GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 5
According to ceramics composition expression formula Zr0.65(Mg1/3Nb2/3)0.35TiO4+ 0.5wt%MnCO3Weigh raw material ZrO2、MgO、
Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C, cross 120
Briquetting after eye mesh screen, is incubated 4h under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；Carried out after sample burning block is crushed
Secondary ball milling, Ball-milling Time is 5h, is dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, micron is made
The spheric granules of level, the screen cloth bilayer sieving through 60 mesh and 120 mesh, porcelain needed for obtaining 60 mesh to 120 purposes suppresses porcelain
Shaping, 2h is sintered under 1280 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=41.3 (5.76GHz), quality
TCF=-13.8ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=6840, Qf=39400GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 6
According to ceramics composition expression formula Zr0.625(Mg1/3Nb2/3)0.375TiO4+ 0.2wt%MnCO3Weigh raw material ZrO2、
MgO、Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C,
Briquetting after 120 eye mesh screens is crossed, 4h is incubated under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；After sample burning block is crushed
Secondary ball milling is carried out, Ball-milling Time is 5h, dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, is made
Micron-sized spheric granules, the screen cloth bilayer sieving through 60 mesh and 120 mesh, obtains porcelain needed for 60 mesh to 120 purposes, by porcelain
It is compressing, 2h is sintered under 1200 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=39.5 (5.72GHz), quality
TCF=-11.8ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=5020, Qf=28700GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 7
According to ceramics composition expression formula Zr0.625(Mg1/3Nb2/3)0.375TiO4+ 0.4wt%MnCO3Weigh raw material ZrO2、
MgO、Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C,
Briquetting after 120 eye mesh screens is crossed, 4h is incubated under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；After sample burning block is crushed
Secondary ball milling is carried out, Ball-milling Time is 5h, dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, is made
Micron-sized spheric granules, the screen cloth bilayer sieving through 60 mesh and 120 mesh, obtains porcelain needed for 60 mesh to 120 purposes, by porcelain
It is compressing, 2h is sintered under 1180 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=46.2 (5.72GHz), quality
TCF=-11.6ppm/ DEG C of temperature coefficient of resonance frequency (test temperature area under factor Q=6890, Qf=38200GHz, microwave
Between be 25 DEG C~85 DEG C).
Embodiment 8
According to ceramics composition expression formula Zr0.625(Mg1/3Nb2/3)0.375TiO4+ 0.5wt%MnCO3Weigh raw material ZrO2、
MgO、Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C,
Briquetting after 120 eye mesh screens is crossed, 4h is incubated under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；After sample burning block is crushed
Secondary ball milling is carried out, Ball-milling Time is 5h, dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, is made
Micron-sized spheric granules, the screen cloth bilayer sieving through 60 mesh and 120 mesh, obtains porcelain needed for 60 mesh to 120 purposes, by porcelain
It is compressing, 2h is sintered under 1180 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=43.3 (5.65GHz), quality
(test temperature is interval for TCF=-11ppm/ DEG C of temperature coefficient of resonance frequency under factor Q=7300, Qf--41200GHz, microwave
For 25 DEG C~85 DEG C).
Embodiment 9
According to ceramics composition expression formula Zr0.6(Mg1/3Nb2/3)0.4TiO4+ 0.2wt%MnCO3Weigh raw material ZrO2、MgO、
Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C, cross 120
Briquetting after eye mesh screen, is incubated 4h under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；Carried out after sample burning block is crushed
Secondary ball milling, Ball-milling Time is 5h, is dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, micron is made
The spheric granules of level, the screen cloth bilayer sieving through 60 mesh and 120 mesh, porcelain needed for obtaining 60 mesh to 120 purposes suppresses porcelain
Shaping, 2h is sintered under 1220 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=42.6 (5.75GHz), quality
(test temperature is interval for TCF=-4.2ppm/ DEG C of temperature coefficient of resonance frequency under factor Q=6220, Qf=35800GHz, microwave
For 25 DEG C~85 DEG C).
Embodiment 10
According to ceramics composition expression formula Zr0.6(Mg1/3Nb2/3)0.4TiO4+ 0.4wt%MnCO3Weigh raw material ZrO2、MgO、
Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C, cross 120
Briquetting after eye mesh screen, is incubated 4h under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；Carried out after sample burning block is crushed
Secondary ball milling, Ball-milling Time is 5h, is dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, micron is made
The spheric granules of level, the screen cloth bilayer sieving through 60 mesh and 120 mesh, porcelain needed for obtaining 60 mesh to 120 purposes suppresses porcelain
Shaping, 2h is sintered under 1260 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=44.1 (5.65GHz), quality
(test temperature interval is TCF=-1ppm/ DEG C of temperature coefficient of resonance frequency under factor Q=6500, Qf=36700GHz, microwave
25 DEG C~85 DEG C).
Embodiment 11
According to ceramics composition expression formula Zr0.6(Mg1/3Nb2/3)0.4TiO4+ 0.5wt%MnCO3Weigh raw material ZrO2、MgO、
Nb2O5、TiO2And MnCO3, with 200r/min speed ball milling 4h after being sufficiently mixed, then dried under the conditions of 120 DEG C, cross 120
Briquetting after eye mesh screen, is incubated 4h under the conditions of air atmosphere, 1000 DEG C, obtains sample burning block；Carried out after sample burning block is crushed
Secondary ball milling, Ball-milling Time is 5h, is dried under the conditions of 120 DEG C, powder is mixed with the aqueous solution of polyvinyl alcohol, micron is made
The spheric granules of level, the screen cloth bilayer sieving through 60 mesh and 120 mesh, porcelain needed for obtaining 60 mesh to 120 purposes suppresses porcelain
Shaping, 2h is sintered under 1240 DEG C of air conditionses, that is, obtains medium dielectric constant microwave medium ceramics as low-loss microwave medium material.
The performance indications of ceramic material are after tested：Relative dielectric constant ε under microwaver=42.7 (5.65GHz), quality
(test temperature is interval for TCF=-0.9ppm/ DEG C of temperature coefficient of resonance frequency under factor Q=7000, Qf=38800GHz, microwave
For 25 DEG C~85 DEG C).
The performance indications that microwave ceramic material is made in embodiment 1-7 are shown in Table 1
The microwave ceramics performance indications of table 1
| Embodiment | εr | Qf(GHz) | TCF(ppm/℃) |
| 1 | 41.5 | 23300 | -14.2 |
| 2 | 42.9 | 41600 | -13.2 |
| 3 | 42.2 | 43500 | -13.5 |
| 4 | 42.3 | 42600 | -13.3 |
| 5 | 41.3 | 39400 | -13.8 |
| 6 | 39.5 | 28700 | -11.8 |
| 7 | 46.2 | 38200 | -11.6 |
| 8 | 43.3 | 41200 | -11 |
| 9 | 42.6 | 35800 | -4.2 |
| 10 | 44.1 | 36700 | -1 |
| 11 | 42.7 | 38800 | -0.9 |
As it can be seen from table 1 the relative dielectric constant of obtained microwave ceramics is 39.5~46.2, quality factor q f=
23300GHz~43500GHz, temperature coefficient of resonance frequency is -14.2ppm/ DEG C~-0.9ppm/ DEG C.
The foregoing examples are merely illustrative of the technical concept and features of the invention, its object is to allow the person skilled in the art to be
Present disclosure can be understood and implemented according to this, it is not intended to limit the scope of the present invention.It is all smart according to the present invention
Equivalent transformation or modification that refreshing essence is done, should all be included within the scope of the present invention.
Claims (4)
1. a kind of preparation method of medium dielectric constant microwave medium ceramics as low-loss microwave medium, it is characterised in that comprise the following steps：
(1) by composition expression formula Zr of the carbonate of zirconium, magnesium, niobium, titanyl compound and manganese according to ceramics(1-x)(Mg1/3Nb2/3)xTiO4+ ywt%MnCO3Abundant ball milling after dispensing mixing is carried out, then dries, sieve and be pressed into blocks, then 1000
4h is incubated at DEG C, sample burning block is obtained, wherein 0.325≤x≤0.4,0.2≤y≤0.5, y is MnCO3Account for Zr(1-x)(Mg1/ 3Nb2/3)xTiO4Mass percent；
(2) abundant ball milling after sample burning block made from step (1) is crushed, then dries, granulates, sieves, by after sieving
Grain is compressing, and 2h is then sintered at 1180 DEG C~1280 DEG C into porcelain, medium dielectric constant microwave medium ceramics as low-loss microwave medium is obtained；
During Ball-milling Time in the step (1) and step (2) during ball milling is 4h~5h, the step (1) and the step (2)
Drying temperature be 100 DEG C~120 DEG C；
Using the screen cloth of 120 mesh when sieving in the step (1), sieving is double-deck sieving in the step (2), use for 60
The screen cloth of mesh and 120 mesh.
2. the preparation method of medium dielectric constant microwave medium ceramics as low-loss microwave medium according to claim 1, it is characterised in that：Institute
State the carbonate respectively ZrO of zirconium, magnesium, niobium, titanyl compound and manganese2、MgO、Nb2O5、TiO2And MnCO3。
3. the preparation method of medium dielectric constant microwave medium ceramics as low-loss microwave medium according to claim 1, it is characterised in that：Institute
Micron-size spherical particles are made after powder is mixed with polyvinyl alcohol water solution when stating granulation in step (2).
4. the preparation method of medium dielectric constant microwave medium ceramics as low-loss microwave medium according to claim 1, it is characterised in that：Institute
The sintering stated in step (2) is carried out in air atmosphere.
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| CN103232239A (en) * | 2013-04-22 | 2013-08-07 | 江苏大学 | Microwave dielectric ceramic material and preparation method thereof |
| CN103864426A (en) * | 2014-01-21 | 2014-06-18 | 天津大学 | Medium-sintering temperature stable microwave dielectric ceramic material |
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| CN103864426A (en) * | 2014-01-21 | 2014-06-18 | 天津大学 | Medium-sintering temperature stable microwave dielectric ceramic material |
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