CN109704764A - Dielectric high-Q microwave dielectric ceramic material, ceramic body and preparation method thereof - Google Patents
Dielectric high-Q microwave dielectric ceramic material, ceramic body and preparation method thereof Download PDFInfo
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- CN109704764A CN109704764A CN201910036686.2A CN201910036686A CN109704764A CN 109704764 A CN109704764 A CN 109704764A CN 201910036686 A CN201910036686 A CN 201910036686A CN 109704764 A CN109704764 A CN 109704764A
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Abstract
The present invention provides a kind of dielectric high-Q microwave dielectric ceramic material, ceramic body and preparation method thereof, its ceramic material includes ceramic major ingredient and additive, and the component of the ceramics major ingredient and its weight percent for accounting for ceramic material total amount are as follows: CaO:10~40%, Al2O3:10~20%, Ln2O3:20~70%, TiO2:1~15%；The Ln is one of La, Sm；Additive includes the oxide of R；The R is Nb, Sr, Zr, Y, Nd, Sc, and the weight percent that the oxide of each R accounts for ceramic material total amount is respectively 1-5%.The dielectric constant adjustable range of the dielectric ceramic material is 18~40, Qf value > 80000GHz, and dielectric dissipation fraction is less than 0.0001；Temperature coefficient of resonance frequency is and adjustable between -5 to+5ppm/ DEG C close to 0ppm, can be used to the microwave radio device for making resonator and high frequency high capacity.
Description
Technical field
The present invention relates to dielectric ceramic material more particularly to a kind of dielectric high-Q microwave dielectric ceramic material, ceramic body and
Preparation method.
Background technique
In face of the arrival of the 5th third-generation mobile communication communication (5G), applied to the dielectric ceramic material of previous generation communication system,
Electrical property is remained to be further improved with operational characteristic, and generally existing following problems: 1) quality factor are lower；2) frequency-temperature coefficient
Job requirement that is excessive, not being able to satisfy under device high and low temperature environment；3) dielectric constant stability is poor, and it is high-precision not to be able to satisfy device
Spend Electrical Indexes requirement；4) porcelain body brittleness is larger or intensity is poor, it is difficult to meet the requirement etc. of device manufacturing process.
Summary of the invention
To solve the above problems, the present invention proposes a kind of dielectric high-Q microwave dielectric ceramic material and preparation method thereof, it should
The dielectric constant adjustable range of dielectric ceramic material is 18~40, Qf value > 80000GHz, and dielectric dissipation fraction is less than 0.0001；It is humorous
Vibration frequency temperature coefficient is and adjustable between -5 to+5ppm/ DEG C close to 0ppm, can be used to make resonator and height
The microwave radio device of frequency high capacity.
Dielectric high-Q microwave dielectric ceramic material provided by the invention, including ceramic major ingredient and additive, the ceramics are main
The component of material and its weight percent for accounting for ceramic material total amount are as follows:
The Ln is one of La, Sm.
Preferably, the additive includes the oxide of R；The R is Nb, Sr, Zr, Y, Nd, Sc, and the oxide of each R accounts for
The weight percent of ceramic material total amount is respectively 1-5%.
The present invention also provides a kind of preparation methods of dielectric high-Q microwave dielectric ceramic material, include the following steps: S1.
Ceramic major ingredient is successively passed through into mixed once, grinding, calcining, grinds preparation mixed once powder again；S2. by the mixed once
Powder and additive mixing, successively up to medium dielectric constant microwave medium high-Q microwave dielectric after secondary mixing, grinding, calcining, grinding again
Ceramic material；
The component of the ceramics major ingredient and its weight percent for accounting for ceramic material total amount are as follows:
The Ln is one of La, Sm；
The additive includes the oxide of R；The R is Nb, Sr, Zr, Y, Nd, Sc, and the oxide of each R accounts for ceramic material
The weight percent of total amount is respectively 1-5%.
Preferably, in the step S1, the grinding include: be added in ceramic major ingredient after mixed once ethyl alcohol or
Water is dried after grinding, is then milled into powder again, is sieved and the ground and mixed powder of ceramic major ingredient is made；The calcining includes:
Ceramics major ingredient calcining material is made in ground and mixed 1~5h of powder that the ceramic major ingredient is calcined at being 1100~1300 DEG C in temperature；
It is described grind again include: by the ceramic major ingredient calcine abrasive lapping to average particle size D50 be 0.3~1.2 μm.
Further preferably, described grind again includes: to be sanded 1~12 hour in sand mill with 10~15m/s of revolving speed.
Preferably, in the step S2, the grinding includes: by being added in secondary mixed ceramic material mixture
Ethyl alcohol or water are dried after grinding, are then milled into powder again, are sieved and the ground and mixed powder of ceramic material is made；It is described to forge
Burning include: be 800~1200 DEG C in temperature at calcine the ground and mixed powder of the ceramic material, ceramic material calcining is made
Material；It is described grind again include: by the ceramic material calcine abrasive lapping to average particle size D50 be 0.5~2.0 μm.
Further preferably, the dosage of the ethyl alcohol or water is 1.5~2.0 times of mixture weight.
The present invention also provides a kind of ceramic bodies, including dielectric high-Q microwave dielectric ceramic material as described above.
The present invention also provides a kind of preparation methods of ceramic body, comprising: makes pottery in dielectric high-Q microwave dielectric as described above
Blank or device is made through dry-pressing or cold isostatic compaction after addition binder in ceramic material, in 1300~1500 DEG C of oxidizing atmospheres
Lower firing, heat preservation obtain ceramic body in 2~6 hours；Or dielectric high-Q microwave dielectric ceramic material as described above is prepared into
Slurry is prepared into pelletizing, then blank or device is made in dry-pressing or cold isostatic compaction by spray drying, 1300~
It is burnt under 1500 DEG C of oxidizing atmospheres, heat preservation obtains ceramic body in 2~6 hours.
Beneficial effects of the present invention: the dielectric high-Q microwave dielectric ceramic material in the present invention, when frequency is 7GHz
Dielectric constant adjustable range is 18~40, and dielectric dissipation fraction is down to 0.0001 hereinafter, Qf value > 80000GHz；Performance is stablized, resonance
Frequency-temperature coefficient is adjustable close to 0ppm, and between -5~+5ppm/ DEG C；Preparation process is simple, at low cost, does not have
Toxic side effect is suitable for producing in batches, can be used for manufacturing resonator, dielectric ceramic filter etc., in the communications field of new generation
It has a extensive future.Ceramic body is prepared using the ceramic material, it can be in normal pressure and wider sintering range (1300-
1500 DEG C) in be sintered, sintering shrinkage can be controlled in 14~20%；The porcelain body being prepared by the dielectric ceramic material
Bending strength is greater than 200MPa.
Detailed description of the invention
Fig. 1 is the preparation technology flow chart of dielectric of embodiment of the present invention high-Q microwave dielectric ceramic material.
Specific embodiment
With reference to embodiment and compares attached drawing invention is further described in detail, it should be emphasised that,
Following the description is only exemplary, the range and its application being not intended to be limiting of the invention.
The present invention provides following 5 more preferably specific embodiments, dielectric high-Q microwave dielectric ceramic material to invention and
Preparation method is illustrated.
Wherein, the component of the dielectric high-Q microwave dielectric ceramic material in each embodiment and its weight percent such as following table
One:
The component and its weight percent of one dielectric high-Q microwave dielectric ceramic material of table
The process flow for preparing dielectric high-Q microwave dielectric ceramic material is as shown in Figure 1, comprising:
1) each group lease making mixed once of ceramic major ingredient mixed once: is prepared into ceramic major ingredient mixture；
2) grind: the ground and mixed powder of ceramics major ingredient is made in ceramic major ingredient mixture of the grinding after mixed once；
3) it calcines: the ground and mixed powder of ceramic major ingredient is calcined, ceramics major ingredient calcining material is made；
4) it grinds again: ceramic major ingredient calcining material is ground again, ceramics major ingredient is made and calcines abrasive lapping mixed powder；
5) secondary mixing: carrying out secondary mixing for additive is added in above-mentioned ceramic major ingredient calcining abrasive lapping mixed powder,
Ceramic material mixture is made；
6) grind: the ground and mixed powder of ceramic material is made through secondary mixed ceramic material mixture in grinding；
7) it calcines: the ground and mixed powder of ceramic material is calcined, ceramic material calcining material is made；
8) it grinds again: ceramic material calcining material being ground again, the ground and mixed powder of ceramic material calcining material is made,
As medium dielectric constant microwave medium high-Q microwave dielectric ceramic material.
Wherein, the grinding of step 2) includes: the second that 1.5-2.0 times is added in the ceramic major ingredient mixture after mixed once
Alcohol or water are dried after grinding with the planetary ball mill 10-24h of 300 revs/min of revolving speeds, are then milled into powder again, and sieving is made
The ground and mixed powder of ceramic major ingredient.
The calcining of step 3) include: be 1100~1300 DEG C in temperature at calcine the ground and mixed powder of the ceramic major ingredient
Ceramics major ingredient calcining material is made in 1~5h.
Grinding again for step 4) includes: that 2- is sanded in sand mill with revolving speed 10-15m/s in the ceramic major ingredient calcining material
12h to average particle size D50 is 0.3~1.2 μm.
The grinding of step 6) includes: in the ethyl alcohol by 1.5-2.0 times of addition in secondary mixed ceramic material mixture
Or water is dried after grinding with the planetary ball mill 10-24h of 300 revs/min of revolving speeds, is then milled into powder again, is sieved and pottery is made
The ground and mixed powder of ceramic material.
The calcining of step 7) include: be 800~1200 DEG C in temperature at calcine the ground and mixed powder of the ceramic material,
Ceramic material calcining material is made.
Grinding again for step 8) includes: to calcine the ceramic material to expect, being ground to average particle size D50 is 0.5~2.0
μm。
Embodiment 1
Weighing each component according to weight percent shown in embodiment 1 in table one, (wherein CaO uses same substance amount
CaCO3), preparation method is in accordance with the following steps:
1) mixed once
Component CaO, Al2O3, Ln2O3, TiO2 of ceramic major ingredient are placed in ball grinder, according to 1 institute of embodiment in table one
Show weight percent mixed once, ceramics major ingredient mixture is made.
2) it grinds
The deionization of about ceramic 1.5 times of mixed weight of major ingredient is added in the ceramic major ingredient mixture after mixed once
Water is dried after planetary ball mill 13 hours in an oven with 300 revs/min, is then milled into powder again, crosses 200 meshes and pottery is made
The ground and mixed powder of porcelain major ingredient.
3) it calcines
Ceramics major ingredient calcining is made in ground and mixed powder 4 hours that the ceramic major ingredient is calcined at being 1200 DEG C in temperature
Material；
4) it grinds again
Ceramic major ingredient calcining material is placed in ball mill after grinding 10h, reuses sand mill, at revolving speed 10m/s, be sanded
10h obtains the ceramic major ingredient calcining abrasive lapping mixed powder of D50=0.3um；
5) secondary mixing
Weight percent shown in embodiment 1 adds in addition table one in above-mentioned ceramic major ingredient calcining abrasive lapping mixed powder
Add agent Nb2O5, SrO, ZrO2, Y2O3, Nd2O3, Sc2O3, is mixed to prepare ceramic material mixture through secondary；
6) it grinds
About 1.5 times of ceramic material mixture weight of deionized water is added in ceramic material mixture, uses 300
It rev/min is dried after planetary ball mill 20 hours, is then milled into powder again, cross the ground and mixed that ceramic material is made in 200 meshes
Powder；
7) it calcines
Ceramic material calcining material is made in the ground and mixed powder 2h that the ceramic material is calcined at being 950 DEG C in temperature；
8) it grinds again
It is 0.55 μm that ceramic material calcining material, which is milled to average particle size D50, the ground and mixed powder of ceramic material calcining material
Body, as medium dielectric constant microwave medium high-Q microwave dielectric ceramic material.
Ceramic body preparation and performance test
After above-mentioned material is made, cylindrical blank conventionally is made in the ground and mixed powder of ceramic material calcining material
Body keeps the temperature 4 hours under 1480 DEG C, oxidizing atmosphere, sintered porcelain knob is carried out electric performance test, as a result as follows: dielectric is normal
Number (@7GHz) εrIt is 19.1, it is 95000 less than 0.0001, Qf value that dielectric loss coefficient tg θ (@7GHz), which is 0.000074, humorous
- 1.2ppm/ DEG C of vibration frequency temperature coefficient；Radial sintered shrinking percentage is about 18.1% after tabletting.
The ground and mixed powder spray drying of above-mentioned ceramic material calcining material is prepared into pelletizing according to a conventional method, is passed through
It is dry-pressing formed, it is burnt under 1480 DEG C, oxidizing atmosphere after dumping, heat preservation can form the good ceramic body of sintering for 1.2 hours；Pottery
Porcelain body bending strength > 200MPa.
Embodiment 2
Weighing each component according to weight percent shown in embodiment 2 in table one, (wherein CaO uses same substance amount
CaCO3), preparation method is in accordance with the following steps:
1) mixed once
Component CaO, Al2O3, Ln2O3, TiO2 of ceramic major ingredient are placed in ball grinder, according to 2 institute of embodiment in table one
Show weight percent mixed once, ceramics major ingredient mixture is made.
2) it grinds
The ethyl alcohol of about ceramic 1.55 times of mixed weight of major ingredient is added in the ceramic major ingredient mixture after mixed once,
It is dried after planetary ball mill 10 hours in an oven with 300 revs/min, is then milled into powder again, crossing 200 meshes, that ceramics are made is main
The ground and mixed powder of material.
3) it calcines
Ceramics major ingredient calcining is made in ground and mixed powder 4 hours that the ceramic major ingredient is calcined at being 1180 DEG C in temperature
Material；
4) it grinds again
Ceramic major ingredient calcining material is placed in ball mill after grinding 10h, reuses sand mill, at revolving speed 12m/s, be sanded
7h obtains the ceramic major ingredient calcining abrasive lapping mixed powder of D50=0.55um；
5) secondary mixing
Weight percent shown in embodiment 2 adds in addition table one in above-mentioned ceramic major ingredient calcining abrasive lapping mixed powder
Add agent Nb2O5, SrO, ZrO2, Y2O3, Nd2O3, Sc2O3, is mixed to prepare ceramic material mixture through secondary；
6) it grinds
About 1.5 times of ceramic material mixture weight of ethyl alcohol is added in ceramic material mixture, uses 300 revs/min
Planetary ball mill is dried after 24 hours, is then milled into powder again, crosses the ground and mixed powder that ceramic material is made in 200 meshes；
7) it calcines
Ceramic material calcining material is made in the ground and mixed powder 2h that the ceramic material is calcined at being 800 DEG C in temperature；
8) it grinds again
It is 0.95 μm that ceramic material calcining material, which is milled to average particle size D50, the ground and mixed powder of ceramic material calcining material
Body, as medium dielectric constant microwave medium high-Q microwave dielectric ceramic material.
Ceramic body preparation and performance test
After above-mentioned material is made, cylindrical blank conventionally is made in the ground and mixed powder of ceramic material calcining material
Body keeps the temperature 4 hours under 1460 DEG C, oxidizing atmosphere, sintered porcelain knob is carried out electric performance test, as a result as follows: dielectric is normal
Number (@7GHz) εrIt is 20.5, it is 93000 less than 0.0001, Qf value that dielectric loss coefficient tg θ (@7GHz), which is 0.000075, humorous
- 0.9ppm/ DEG C of vibration frequency temperature coefficient；Radial sintered shrinking percentage is about 16.7% after tabletting.
The ground and mixed powder spray drying of above-mentioned ceramic material calcining material is prepared into pelletizing according to a conventional method, is passed through
It is dry-pressing formed, it is burnt under 1460 DEG C, oxidizing atmosphere after dumping, heat preservation can form the good ceramic body of sintering for 4 hours；Ceramics
Body bending strength > 200MPa.
Embodiment 3
Weighing each component according to weight percent shown in embodiment 3 in table one, (wherein CaO uses same substance amount
CaCO3), preparation method is in accordance with the following steps:
1) mixed once
Component CaO, Al2O3, Ln2O3, TiO2 of ceramic major ingredient are placed in ball grinder, according to 3 institute of embodiment in table one
Show weight percent mixed once, ceramics major ingredient mixture is made.
2) it grinds
The ethyl alcohol of about ceramic 1.55 times of mixed weight of major ingredient is added in the ceramic major ingredient mixture after mixed once,
It is dried after planetary ball mill 24 hours in an oven with 300 revs/min, is then milled into powder again, crossing 200 meshes, that ceramics are made is main
The ground and mixed powder of material.
3) it calcines
Ceramics major ingredient calcining is made in ground and mixed powder 5 hours that the ceramic major ingredient is calcined at being 1160 DEG C in temperature
Material；
4) it grinds again
Ceramic major ingredient calcining material is placed in ball mill after grinding 10h, reuses sand mill, at revolving speed 12m/s, be sanded
6h obtains the ceramic major ingredient calcining abrasive lapping mixed powder of D50=0.6um；
5) secondary mixing
Weight percent shown in embodiment 3 adds in addition table one in above-mentioned ceramic major ingredient calcining abrasive lapping mixed powder
Add agent Nb2O5, SrO, ZrO2, Y2O3, Nd2O3, Sc2O3, is mixed to prepare ceramic material mixture through secondary；
6) it grinds
About 2.0 times of ceramic material mixture weight of deionized water is added in ceramic material mixture, uses 300
It rev/min is dried after planetary ball mill 10 hours, is then milled into powder again, cross the ground and mixed that ceramic material is made in 200 meshes
Powder；
7) it calcines
Ceramic material calcining material is made in the ground and mixed powder 2h that the ceramic material is calcined at being 980 DEG C in temperature；
8) it grinds again
It is 1.13 μm that ceramic material calcining material, which is milled to average particle size D50, the ground and mixed powder of ceramic material calcining material
Body, as medium dielectric constant microwave medium high-Q microwave dielectric ceramic material.
Ceramic body preparation and performance test
After above-mentioned material is made, cylindrical blank conventionally is made in the ground and mixed powder of ceramic material calcining material
Body keeps the temperature 4 hours under 1450 DEG C, oxidizing atmosphere, sintered porcelain knob is carried out electric performance test, as a result as follows: dielectric is normal
Number (@7GHz) εrIt is 26.7, it is 89300 less than 0.0001, Qf value that dielectric loss coefficient tg θ (@7GHz), which is 0.000078, humorous
0.5ppm/ DEG C of vibration frequency temperature coefficient；Radial sintered shrinking percentage is about 15.9% after tabletting.
The ground and mixed powder spray drying of above-mentioned ceramic material calcining material is prepared into pelletizing according to a conventional method, is passed through
It is dry-pressing formed, it is burnt under 1450 DEG C, oxidizing atmosphere after dumping, heat preservation can form the good ceramic body of sintering for 4 hours；Ceramics
Body bending strength > 200MPa.
Embodiment 4
Weighing each component according to weight percent shown in embodiment 4 in table one, (wherein CaO uses same substance amount
CaCO3), preparation method is in accordance with the following steps:
1) mixed once
Component CaO, Al2O3, Ln2O3, TiO2 of ceramic major ingredient are placed in ball grinder, according to 4 institute of embodiment in table one
Show weight percent mixed once, ceramics major ingredient mixture is made.
2) it grinds
The deionization of about ceramic 2.0 times of mixed weight of major ingredient is added in the ceramic major ingredient mixture after mixed once
Water is dried after planetary ball mill 20 hours in an oven with 300 revs/min, is then milled into powder again, crosses 200 meshes and pottery is made
The ground and mixed powder of porcelain major ingredient.
3) it calcines
Ceramics major ingredient calcining is made in ground and mixed powder 3 hours that the ceramic major ingredient is calcined at being 1120 DEG C in temperature
Material；
4) it grinds again
Ceramic major ingredient calcining material is placed in ball mill after grinding 10h, reuses sand mill, at revolving speed 15m/s, be sanded
1.5h obtains the ceramic major ingredient calcining abrasive lapping mixed powder of D50=1.2um；
5) secondary mixing
Weight percent shown in embodiment 4 adds in addition table one in above-mentioned ceramic major ingredient calcining abrasive lapping mixed powder
Add agent Nb2O5, SrO, ZrO2, Y2O3, Nd2O3, Sc2O3, is mixed to prepare ceramic material mixture through secondary；
6) it grinds
About 2.0 times of ceramic material mixture weight of ethyl alcohol is added in ceramic material mixture, uses 300 revs/min
Planetary ball mill is dried after 18 hours, is then milled into powder again, crosses the ground and mixed powder that ceramic material is made in 200 meshes；
7) it calcines
Ceramic material calcining material is made in the ground and mixed powder 2h that the ceramic material is calcined at being 1020 DEG C in temperature；
8) it grinds again
It is 2.0 μm that ceramic material calcining material, which is milled to average particle size D50, the ground and mixed powder of ceramic material calcining material
Body, as medium dielectric constant microwave medium high-Q microwave dielectric ceramic material.
Ceramic body preparation and performance test
After above-mentioned material is made, cylindrical blank conventionally is made in the ground and mixed powder of ceramic material calcining material
Body keeps the temperature 4 hours under 1420 DEG C, oxidizing atmosphere, sintered porcelain knob is carried out electric performance test, as a result as follows: dielectric is normal
Number (@7GHz) εrIt is 35.6, it is 87400 less than 0.0001, Qf value that dielectric loss coefficient tg θ (@7GHz), which is 0.00008, resonance
1.1ppm/ DEG C of frequency-temperature coefficient；Radial sintered shrinking percentage is about 15.7% after tabletting.
The ground and mixed powder spray drying of above-mentioned ceramic material calcining material is prepared into pelletizing according to a conventional method, is passed through
It is dry-pressing formed, it is burnt under 1420 DEG C, oxidizing atmosphere after dumping, heat preservation can form the good ceramic body of sintering for 4 hours；Ceramics
Body bending strength > 200MPa.
Embodiment 5
Weighing each component according to weight percent shown in embodiment 5 in table one, (wherein CaO uses same substance amount
CaCO3), preparation method is in accordance with the following steps:
1) mixed once
Component CaO, Al2O3, Ln2O3, TiO2 of ceramic major ingredient are placed in ball grinder, according to 5 institute of embodiment in table one
Show weight percent mixed once, ceramics major ingredient mixture is made.
2) it grinds
The ethyl alcohol of about ceramic 1.8 times of mixed weight of major ingredient is added in the ceramic major ingredient mixture after mixed once,
It is dried after planetary ball mill 13 hours in an oven with 300 revs/min, is then milled into powder again, crossing 200 meshes, that ceramics are made is main
The ground and mixed powder of material.
3) it calcines
Ceramics major ingredient calcining is made in ground and mixed powder 4 hours that the ceramic major ingredient is calcined at being 1300 DEG C in temperature
Material；
4) it grinds again
Ceramic major ingredient calcining material is placed in ball mill after grinding 10h, reuses sand mill, at revolving speed 12m/s, be sanded
8h obtains the ceramic major ingredient calcining abrasive lapping mixed powder of D50=0.5um；
5) secondary mixing
Weight percent shown in embodiment 5 adds in addition table one in above-mentioned ceramic major ingredient calcining abrasive lapping mixed powder
Add agent Nb2O5, SrO, ZrO2, Y2O3, Nd2O3, Sc2O3, is mixed to prepare ceramic material mixture through secondary；
6) it grinds
About 1.8 times of ceramic material mixture weight of deionized water is added in ceramic material mixture, uses 300
It rev/min is dried after planetary ball mill 20 hours, is then milled into powder again, cross the ground and mixed that ceramic material is made in 200 meshes
Powder；
7) it calcines
Ceramic material calcining material is made in the ground and mixed powder 2h that the ceramic material is calcined at being 1200 DEG C in temperature；
8) it grinds again
It is 1.22 μm that ceramic material calcining material, which is milled to average particle size D50, the ground and mixed powder of ceramic material calcining material
Body, as medium dielectric constant microwave medium high-Q microwave dielectric ceramic material.
Ceramic body preparation and performance test
After above-mentioned material is made, cylindrical blank conventionally is made in the ground and mixed powder of ceramic material calcining material
Body keeps the temperature 4 hours under 1320 DEG C, oxidizing atmosphere, sintered porcelain knob is carried out electric performance test, as a result as follows: dielectric is normal
Number (@7GHz) εrIt is 39.5, it is 80300 less than 0.0001, Qf value that dielectric loss coefficient tg θ (@7GHz), which is 0.000086, humorous
2.1ppm/ DEG C of vibration frequency temperature coefficient；Radial sintered shrinking percentage is about 14.6% after tabletting.
The ground and mixed powder spray drying of above-mentioned ceramic material calcining material is prepared into pelletizing according to a conventional method, is passed through
It is dry-pressing formed, it is burnt under 1320 DEG C, oxidizing atmosphere after dumping, heat preservation can form the good ceramic body of sintering for 4 hours；Ceramics
Body bending strength > 200MPa.
By embodiment as above it is found that dielectric high-Q microwave dielectric ceramic material of the invention, when frequency is 7GHz
Dielectric constant adjustable range is 18~40, and dielectric dissipation fraction is down to 0.0001 hereinafter, value > 80000 Qf；Performance is stablized, resonance frequency
Rate temperature coefficient is adjustable close to 0ppm, and between -5~+5ppm/ DEG C；Preparation process is simple, at low cost, without poison
Side effect is suitable for producing in batches, can be used for manufacturing resonator, dielectric ceramic filter etc., answers in the communications field of new generation
With having a extensive future.Ceramic body is prepared using the ceramic material, it can be in normal pressure and wider sintering range (1300-1500
DEG C) in be sintered, sintering shrinkage can be controlled in 14~20%；The porcelain body bending being prepared by the dielectric ceramic material
Intensity is greater than 200MPa.
The above content is combine it is specific/further detailed description of the invention for preferred embodiment, cannot recognize
Fixed specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, some replacements or modifications can also be made to the embodiment that these have been described,
And these substitutions or variant all shall be regarded as belonging to protection scope of the present invention.
Claims (10)
1. a kind of dielectric high-Q microwave dielectric ceramic material, which is characterized in that including ceramic major ingredient and additive, the ceramics
The component of major ingredient and its weight percent for accounting for ceramic material total amount are as follows:
The Ln is one of La, Sm.
2. dielectric high-Q microwave dielectric ceramic material as described in claim 1, which is characterized in that the additive includes R's
Oxide；The R is Nb, Sr, Zr, Y, Nd, Sc, and the weight percent that the oxide of each R accounts for ceramic material total amount is respectively 1-
5%.
3. a kind of preparation method of dielectric high-Q microwave dielectric ceramic material, which comprises the steps of:
S1. ceramic major ingredient successively passed through into mixed once, grinding, calcining, grind preparation mixed once powder again；
S2. the mixed once powder and additive are mixed, successively after secondary mixing, grinding, calcining, grinding again to obtain the final product
Medium dielectric constant microwave medium high-Q microwave dielectric ceramic material；
The component of the ceramics major ingredient and its weight percent for accounting for ceramic material total amount are as follows:
The Ln is one of La, Sm；
The additive includes the oxide of R；The R is Nb, Sr, Zr, Y, Nd, Sc, and the oxide of each R accounts for ceramic material total amount
Weight percent be respectively 1-5%.
4. preparation method as claimed in claim 3, which is characterized in that in the step S1,
The grinding includes: that ethyl alcohol or water are added in ceramic major ingredient after mixed once, dries after grinding, then grinds again
At powder, it is sieved and the ground and mixed powder of ceramic major ingredient is made；
The calcining include: be 1100~1300 DEG C in temperature at calcine ground and mixed 1~5h of powder of the ceramic major ingredient, system
Obtain ceramic major ingredient calcining material；
It is described grind again include: by the ceramic major ingredient calcine abrasive lapping to average particle size D50 be 0.3~1.2 μm.
5. preparation method as claimed in claim 4, which is characterized in that described grind again includes: in sand mill with revolving speed 10
~15m/s is sanded 2~12 hours.
6. preparation method as claimed in claim 3, which is characterized in that in the step S2,
The grinding includes: to dry after grinding, then by ethyl alcohol or water are added in secondary mixed ceramic material mixture
Again it is milled into powder, is sieved and the ground and mixed powder of ceramic material is made；
The calcining include: be 800~1200 DEG C in temperature at calcine the ground and mixed powder of the ceramic material, ceramics are made
Calcined material material；
It is described grind again include: by the ceramic material calcine abrasive lapping to average particle size D50 be 0.5~2.0 μm.
7. the preparation method as described in claim 4 or 6, which is characterized in that the dosage of the ethyl alcohol or water is mixture weight
1.5~2.0 times.
8. a kind of ceramic body, which is characterized in that including the described in any item dielectric high-Q microwave dielectric potteries of such as claim 1-2
Ceramic material.
9. a kind of preparation method of ceramic body characterized by comprising
Through dry-pressing after addition binder in the described in any item dielectric high-Q microwave dielectric ceramic materials of such as claim 1-2
Or blank or device is made in cold isostatic compaction, is burnt under 1300~1500 DEG C of oxidizing atmosphere, heat preservation is made pottery for 2~6 hours
Porcelain body.
10. a kind of preparation method of ceramic body characterized by comprising will be such as the described in any item dielectrics of claim 1-2
High-Q microwave dielectric ceramic material is prepared into slurry, by spray drying, is prepared into pelletizing, then dry-pressing or cold isostatic compaction
Blank or device is made, is burnt under 1300~1500 DEG C of oxidizing atmosphere, heat preservation obtains ceramic body in 2~6 hours.
Priority Applications (1)
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