CN105294104A - Low-loss dielectric adjustable mediation microwave dielectric ceramic material and preparation method thereof - Google Patents
Low-loss dielectric adjustable mediation microwave dielectric ceramic material and preparation method thereof Download PDFInfo
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- CN105294104A CN105294104A CN201510867200.1A CN201510867200A CN105294104A CN 105294104 A CN105294104 A CN 105294104A CN 201510867200 A CN201510867200 A CN 201510867200A CN 105294104 A CN105294104 A CN 105294104A
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Abstract
The invention particularly relates to a low-loss dielectric-adjustable mediation microwave dielectric ceramic material and a preparation method thereof. The chemical composition of the ceramic material is aCa(ZrxTi1-x)O3 plus (1-a)La1 plus yAlO3 plus z wt percent of Al2O3, wherein a is greater than or equal to 0.30 and less than or equal to 0.35, x is greater than or equal to 0 and less than or equal to 0.1, y is greater than or equal to 0 and less than or equal to 0.01 and z is greater than or equal to 0 and less than or equal to 1. The ceramic material is low-cost CaTiO3-LaAlO3 system microwave dielectric ceramic capable of replacing CaTiO3-NdAlO3 system ceramic, greatly reduces the production cost, is a low-cost microwave dielectric ceramic material having low loss and dielectric-adjustable characteristic and being applicable to the microwave devices such as a dielectric resonator, a filter and a duplexer, a dielectric constant is adjustable, Q multiplied by f is high, and a temperature coefficient of resonance frequency tao f is excellent. The invention also provides the preparation method of the ceramic material with the advantages of low material price and simple and practicable process route.
Description
Technical field
The present invention is specifically related to a kind of low-loss dielectric adjustable intermediary microwave dielectric ceramic materials and preparation method thereof.
Background technology
Along with developing rapidly of modern communication technology, the especially rapid propelling of 4G, 5G network, miniaturization, integrated and cost degradation become the developing direction of mobile communication and mobile terminal.Realize the miniaturization of signal equipment, the approach of high stability and cheapness is the integrated of microwave circuit.Traditional Metal cavity and metal wave-guide volume and weight excessive, limit the development of microwave integrated circuit, need for this reason develop a series of electronically materials and component being suitable for having in microwave range high-performance, highly reliable performance characteristics.The best dielectric substance being applicable to this requirement that Medium dielectric constant, high-quality factor microwave medium ceramic develop rapidly just in this context, it has the Comprehensive Characteristics such as low lossy microwave, higher specific inductivity and frequency-temperature coefficient be little, having the advantages such as volume is little, lightweight, message transmission rate is high with the wave filter that it makes, is solve the critical material that current LTE network builds frequency spectrum resource bottleneck problem.
At present, the microwave-medium ceramics of Medium dielectric constant, high quality factor is mainly with BaTi
4o
9, Ba
2ti
9o
20(Zr, Sn) TiO
4and MTiO
3-LnAlO
3(M:Sr, Ca; Ln:La, Nd, Sm) etc. for the microwave dielectric material of base be main.BaTi
4o
9, Ba
2ti
9o
20(Zr, Sn) TiO
4research comparatively early, and studies to obtain unusual system, but the specific inductivity of these potteries (usual ε on the low side
r≤ 40) trend of microwave circuit miniaturization, is unfavorable for.At MTiO
3-LnAlO
3in system, CaTiO
3-NdAlO
3microwave-medium ceramics gets most of the attention owing to having the adjustability of excellent microwave dielectric property and perovskite structure.The scholar of Britain, Russia, Japan and other countries in succession researchs and develops performance and reaches ε
rbe 43 ~ 48, Q × f>=40000GHz, τ
fthe CaTiO of ≈ 0ppm/ DEG C
3-NdAlO
3system microwave-medium ceramics, but the performance index that there is not yet that this based material reaches external product in application aspect at home, Q × f value of home products far below external product, only at about 35000GHz.The CaTiO of domestic industry production and application
3-NdAlO
3series ceramic mainly buys synthetic ceramic powder from Japan, has not only spent a large amount of foreign exchange, but also has been unfavorable for proprietary technology progress.In addition, rare earth oxide Nd
2o
3the costliness of raw material, price is for CaTiO
3-NdAlO
3it is a very large limiting factor that the commercial applications of microwave-medium ceramics is promoted.Therefore, a kind of alternative CaTiO is obtained
3-NdAlO
3pottery and be easy to the low cost microwave-medium ceramics of mass production, not only has important social benefit but also has significant economic interests.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of low-loss dielectric adjustable intermediary microwave dielectric ceramic materials, is a kind of alternative CaTiO
3-NdAlO
3the low cost CaTiO of system's pottery
3-LaAlO
3series microwave dielectric ceramic, significantly reduces production cost, and have low-loss dielectric tunable characteristic, specific inductivity is adjustable, the high and temperature coefficient of resonance frequency τ of Q × f
fexcellence, the present invention also provides its preparation method.
Low-loss dielectric of the present invention is adjustable intermediary's microwave dielectric ceramic materials, chemical constitution is: aCa (Zr
xti
1-x) O
3+ (1-a) La
1+yalO
3+ zwt%Al
2o
3, wherein 0.30≤a≤0.35,0≤x≤0.1,0≤y≤0.01,0≤z≤1.
Wherein:
Zwt% in chemical constitution is Al
2o
3account for (aCa (Zr
xti
1-x) O
3+ (1-a) La
1+yalO
3) massfraction.
Preferred as one, 0.30≤a≤0.35,0<x≤0.1,0<y≤0.01,0<z≤1, the microwave dielectric ceramic materials ε of this kind of chemical constitution
r=43 ~ 48, Q × f>=38500GHz, temperature coefficient of resonance frequency τ
fexcellence is a kind of low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
Preferred as one, a=0.31,0≤x≤0.06,0≤y≤0.005,0≤z≤0.6.
Preferred as one, a=0.31,0<x≤0.06,0<y≤0.005,0<z≤0.6, the microwave dielectric ceramic materials ε of this kind of chemical constitution
r=45 ~ 46, Q × f>=43500GHz, temperature coefficient of resonance frequency τ
fexcellent.
Preferred as one, a=0.31, x=0.02, y=0.03,0.15<z≤0.5, the microwave dielectric ceramic materials ε of this kind of chemical constitution
r=45 ~ 46, Q × f>=45000GHz, temperature coefficient of resonance frequency τ
fexcellent.
The preparation method of low-loss dielectric of the present invention is adjustable intermediary's microwave dielectric ceramic materials, comprises the following steps:
(1) with CaCO
3, ZrO
2, TiO
2, La
2o
3, Al
2o
3for raw material, all raw materials are put into ball mill ball milling, obtain the slurry of particle diameter 1.5 ~ 2.8 μm;
(2), after the slurry crossed by ball milling is dried, tabletted, through 1240 ~ 1280 DEG C of pre-burnings 2 ~ 6 hours, obtains burning block;
(3) block after pre-burning is pulverized, add the Al of powder quality mark 0 ~ 1%
2o
3, PVA, PVB or CMC of 0.3% ~ 1%, the sodium polyacrylate of 0.05% ~ 1% and the tbp of 0.01% ~ 0.2% are ball-milling medium ball milling with deionized water, obtain the slurry of particle diameter 0.6 ~ 1.4 μm;
(4) slurry is after mist projection granulating, is pressed into cylinder;
(5) then carry out binder removal process, then intensification sinters, and can obtain low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
Wherein: in step (1), ball mill is the horizontal ceramic ball mill of 50Kg, and Ball-milling Time is 12 ~ 18 hours.
Being pressed into cylinder in step (4) is: under the pressure of 160MPa, be pressed into diameter be 15mm, be highly the cylinder of 6mm.
Step (5) is: sample is incubated binder removal process in 2 hours at 650 DEG C, then be warming up to 1450 DEG C ~ 1520 DEG C to sinter, temperature rise rate is 120-180 DEG C/h, and soaking time is 4 ~ 6h, can obtain low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
As a kind of optimal technical scheme, the preparation method of low-loss dielectric of the present invention is adjustable intermediary's microwave dielectric ceramic materials, comprises the following steps:
(1) with CaCO
3, ZrO
2, TiO
2, La
2o
3, Al
2o
3for raw material, all raw materials are put into the horizontal ceramic ball mill ball milling of 50KG 12 ~ 18 hours, obtain the slurry of particle diameter 1.5 ~ 2.8 μm;
(2) slurry crossed by ball milling is pressed into the sheet of diameter 50mm after drying under the pressure of 30MPa, through rising to 1240 ~ 1280 DEG C of pre-burnings 2 ~ 6 hours with the temperature rise rate of 4 DEG C/min, obtains burning block;
(3) cross 30 ~ 80 mesh sieves after being pulverized by the block after pre-burning, add the Al of powder quality mark 0 ~ 1%
2o
3, PVA, PVB or CMC of 0.3% ~ 1%, the sodium polyacrylate of 0.05% ~ 1% and the tbp of 0.01% ~ 0.2% take deionized water as ball-milling medium, with 120L Ball-stirring mill ball milling 2 ~ 4 hours, obtain the slurry of particle diameter 0.6 ~ 1.4 μm;
(4) slurry is after mist projection granulating, is pressed into diameter and is 15mm, is highly the cylinder of 6mm under the pressure of 160MPa;
(5) sample is incubated binder removal process in 2 hours at 650 DEG C, be then warming up to 1450 DEG C ~ 1520 DEG C and sinter, temperature rise rate is 120-180 DEG C/h, and soaking time is 4 ~ 6h, can obtain low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
The present invention selects the CaTiO of high-k, positive temperature coefficient of resonance frequency
3with the low cost LaAlO of low-k, negative temperature coefficient of resonance frequency
3compound, and by adulterating ZrO in pottery
2, suitably regulate La
2o
3content, add Al after secondary ball milling
2o
3mode regulate and control the microstructure of pottery, and then provide a kind of low-loss dielectric adjustable aCa (Zr
xti
1-x) O
3+ (1-a) La
1+yalO
3+ zwt%Al
2o
3microwave dielectric ceramic materials.This is pottery is a kind of microwave dielectric ceramic materials having the high-performance and low-cost of using value.
In sum, the present invention has the following advantages:
(1) the present invention selects high-k ε
r≈ 170, positive temperature coefficient of resonance frequency τ
fthe CaTiO of ≈ 800ppm/ DEG C
3with low-k ε
r≈ 23.4, negative temperature coefficient of resonance frequency τ
fthe low cost LaAlO of ≈-44ppm/ DEG C
3compound, and by adulterating ZrO in pottery
2, suitably regulate La
2o
3content, add Al after secondary ball milling
2o
3mode regulate and control the microstructure of pottery, and then obtain and a kind ofly there is low-loss dielectric tunable characteristic and be applicable to the low cost microwave dielectric ceramic materials of the microwave devices such as dielectric resonator, wave filter and duplexer.
(2) the present invention is a kind of CaTiO of low cost microwave dielectric property excellence
3-LaAlO
3series ceramic material, specific inductivity, the temperature coefficient of resonance frequency of this microwave dielectric material can compare continuously adjustabe in wider scope with chemical composition, can according to the requirement adjust structure of designed device and performance.
(3) the present invention adopts cheap raw material, simple operational path, prepares alternative CaTiO
3-NdAlO
3the low cost CaTiO of system's pottery
3-LaAlO
3series microwave dielectric ceramic, filled up the vacancy of current this material independent research domestic, significantly reduce production cost, raw materials cost compares CaTiO
3-NbAlO
3series microwave dielectric ceramic reduces 1/3rd.
Accompanying drawing explanation
Fig. 1 is 0.31Ca (Zr prepared by embodiment 13
0.02ti
0.98) O
3+ 0.69La
1.003alO
3+ 0.4wt%Al
2o
3xRD figure spectrum during pottery room temperature.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1-5
By general formula 0.31Ca (Zr
xti
1-x) O
3+ 0.69LaAlO
3batching prepares pottery of the present invention through following steps:
(1) analytical pure chemical reagent CaCO is adopted
3, ZrO
2, TiO
2, La
2o
3, Al
2o
3for raw material, by 0.31Ca (Zr
xti
1-x) O
3+ 0.69LaAlO
3chemical general formula mol ratio, wherein 0≤x≤0.06.The raw material prepared is put into the horizontal ceramic ball mill ball milling of 50KG 16 hours, obtain the slurry of particle diameter 2.3 μm;
(2) slurry crossed by ball milling is pressed into the sheet of diameter 50mm after drying under the pressure of 30MPa, through rising to 1260 DEG C of pre-burnings 4 hours with the temperature rise rate of 4 DEG C/min, obtains burning block;
(3) 50 mesh sieves are crossed after being pulverized by the block after pre-burning, add PVA (PVB, CMC), the sodium polyacrylate of 0.1%, the tbp of 0.05% of powder quality 0.5%, take deionized water as ball-milling medium, with 120L Ball-stirring mill ball milling 3 hours, obtain the slurry of particle diameter 1.1 μm;
(4) slurry is after mist projection granulating, is pressed into diameter and is 15mm, is highly the cylinder of 6mm under the pressure of 160MPa;
(5) sample is incubated binder removal process in 2 hours at 650 DEG C, be then warming up to 1470 DEG C ~ 1520 DEG C and sinter, temperature rise rate is 180 DEG C/h, and soaking time is 6h, can obtain 031Ca (Zr
xti
1-x) O
3+ 0.69LaAlO
3microwave dielectric ceramic materials.
The chemical formula of the microwave dielectric ceramic materials that embodiment 1-5 prepares is 0.31Ca (Zr
xti
1-x) O
3+ 0.69LaAlO
3wherein x is respectively 0, and 0.01,0.02,0.04,0.06, corresponding embodiment 1-5, carries out performance test to the microwave dielectric ceramic materials that embodiment 1-5 prepares respectively, adopt relative permittivity and the quality factor of Agilent8722ET network analyzer (open type cell method) analysis of material, with Agilent8722ET network analyzer and exact constant temperature case, measure the temperature coefficient of resonance frequency of material, Range of measuring temp is-40 DEG C ~ 80 DEG C.Test result is in table 1.
Table 10.31Ca (Zr
xti
1-x) O
3+ 0.69LaAlO
3ceramic microwave dielectric properties
| x | Sintering temperature (DEG C) | ε r | Q×f(GHz) | τ f(ppm/℃) | |
| Embodiment 1 | 0 | 1470 | 48.1 | 34172 | 7.4 |
| Embodiment 2 | 0.01 | 1480 | 46.6 | 39290 | 4.5 |
| Embodiment 3 | 0.02 | 1490 | 45.3 | 42516 | 2.3 |
| Embodiment 4 | 0.04 | 1500 | 44.1 | 41675 | -2.1 |
| Embodiment 5 | 0.06 | 1520 | 43.1 | 38682 | -4.7 |
Embodiment 6-9
By general formula 0.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1+yalO
3batching, adopt the preparation method identical with embodiment 1 to prepare microwave dielectric ceramic materials, the chemical formula of the microwave dielectric ceramic materials prepared is 0.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1+yalO
3wherein y is respectively 0,0.01,0.03,0.05, corresponding embodiment 6-9 respectively, performance test is carried out to the microwave dielectric ceramic materials that embodiment 6-9 prepares, adopts relative permittivity and the quality factor of Agilent8722ET network analyzer (open type cell method) analysis of material, with Agilent8722ET network analyzer and exact constant temperature case, measure the temperature coefficient of resonance frequency of material, Range of measuring temp is-40 DEG C ~ 80 DEG C.Test result is in table 2.
Table 20.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1+yalO
3ceramic microwave dielectric properties
| y | Sintering temperature (DEG C) | ε r | Q×f(GHz) | τ f(ppm/℃) | |
| Embodiment 6 | 0 | 1490 | 45.3 | 42516 | 2.3 |
| Embodiment 7 | 0.001 | 1490 | 45.4 | 42832 | 2.5 |
| Embodiment 8 | 0.003 | 1480 | 45.5 | 43938 | 2.6 |
| Embodiment 9 | 0.005 | 1480 | 45.1 | 43156 | 3.2 |
Embodiment 10-14
By general formula 0.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1.003alO
3+ zwt%Al
2o
3pottery of the present invention is prepared through following steps:
(1) analytical pure chemical reagent CaCO is adopted
3, ZrO
2, TiO
2, La
2o
3, Al
2o
3for raw material, by 0.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1.003alO
3chemical general formula mol ratio, the raw material prepared is put into the horizontal ceramic ball mill ball milling of 50KG 16 hours, obtains the slurry of particle diameter 2.3 μm;
(2) slurry crossed by ball milling is pressed into the sheet of diameter 50mm after drying under the pressure of 30MPa, through rising to 1260 DEG C of pre-burnings 4 hours with the temperature rise rate of 4 DEG C/min, obtains burning block;
(3) cross 50 mesh sieves after being pulverized by the block after pre-burning, add the Al of powder quality 0 ~ 0.6%
2o
3, 0.5% PVA (PVB, CMC), the sodium polyacrylate of 0.1%, the tbp of 0.05%, take deionized water as ball-milling medium, with 120L Ball-stirring mill ball milling 2 hours, obtain the slurry of particle diameter 1.1 μm;
(4) slurry is after mist projection granulating, is pressed into diameter and is 15mm, is highly the cylinder of 6mm under the pressure of 160MPa;
(5) sample is incubated binder removal process in 2 hours at 650 DEG C, is then warming up to 1480 DEG C and sinters, temperature rise rate is 180 DEG C/h, and soaking time is 6h, can obtain 0.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1.003alO
3+ zwt%Al
2o
3microwave dielectric ceramic materials.
The chemical formula of the microwave dielectric ceramic materials that embodiment 10-14 prepares is 0.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1.003alO
3+ zwt%Al
2o
3wherein z is respectively 0, and 0.1,0.2,0.4,0.6, corresponding embodiment 10-14, carries out performance test to the microwave dielectric ceramic materials that embodiment 10-14 prepares respectively, adopt relative permittivity and the quality factor of Agilent8722ET network analyzer (open type cell method) analysis of material, with Agilent8722ET network analyzer and exact constant temperature case, measure the temperature coefficient of resonance frequency of material, Range of measuring temp is-40 DEG C ~ 80 DEG C.Test result is in table 3.
Table 30.31Ca (Zr
0.02ti
0.98) O
3+ 0.69La
1.003alO
3+ zwt%Al
2o
3ceramic microwave dielectric properties
| z | Sintering temperature (DEG C) | ε r | Q×f(GHz) | τ f(ppm/℃) | |
| Embodiment 10 | 0 | 1480 | 45.5 | 43938 | 2.6 |
| Embodiment 11 | 0.1 | 1480 | 45.6 | 44752 | 1.5 |
| Embodiment 12 | 0.2 | 1480 | 45.5 | 45362 | -0.4 |
| Embodiment 13 | 0.4 | 1480 | 45.3 | 46136 | -1.7 |
| Embodiment 14 | 0.6 | 1480 | 45.1 | 43854 | -3.2 |
Claims (10)
1. a low-loss dielectric adjustable intermediary microwave dielectric ceramic materials, is characterized in that: chemical constitution is: aCa (Zr
xti
1-x) O
3+ (1-a) La
1+yalO
3+ zwt%Al
2o
3, wherein 0.30≤a≤0.35,0≤x≤0.1,0≤y≤0.01,0≤z≤1.
2. low-loss dielectric according to claim 1 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: 0.30≤a≤0.35,0<x≤0.1,0<y≤0.01,0<z≤1.
3. low-loss dielectric according to claim 1 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: a=0.31,0≤x≤0.06,0≤y≤0.005,0≤z≤0.6.
4. low-loss dielectric according to claim 1 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: a=0.31,0<x≤0.06,0<y≤0.005,0<z≤0.6.
5. low-loss dielectric according to claim 1 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: a=0.31, x=0.02, y=0.03,0.15<z≤0.5.
6., according to the preparation method of the arbitrary described low-loss dielectric adjustable intermediary microwave dielectric ceramic materials of claim 1-5, it is characterized in that: comprise the following steps:
(1) with CaCO
3, ZrO
2, TiO
2, La
2o
3, Al
2o
3for raw material, all raw materials are put into ball mill ball milling, obtain the slurry of particle diameter 1.5 ~ 2.8 μm;
(2), after the slurry crossed by ball milling is dried, tabletted, through 1240 ~ 1280 DEG C of pre-burnings 2 ~ 6 hours, obtains burning block;
(3) block after pre-burning is pulverized, add the Al of powder quality mark 0 ~ 1%
2o
3, PVA, PVB or CMC of 0.3% ~ 1%, the sodium polyacrylate of 0.05% ~ 1% and the tbp of 0.01% ~ 0.2% are ball-milling medium ball milling with deionized water, obtain the slurry of particle diameter 0.6 ~ 1.4 μm;
(4) slurry is after mist projection granulating, is pressed into cylinder;
(5) then carry out binder removal process, then intensification sinters, and can obtain low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
7. the preparation method of low-loss dielectric according to claim 6 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: in step (1), ball mill is the horizontal ceramic ball mill of 50Kg, and Ball-milling Time is 12 ~ 18 hours.
8. the preparation method of low-loss dielectric according to claim 6 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: being pressed into cylinder in step (4) is: under the pressure of 160MPa, be pressed into diameter be 15mm, be highly the cylinder of 6mm.
9. the preparation method of low-loss dielectric according to claim 6 adjustable intermediary microwave dielectric ceramic materials, it is characterized in that: step (5) is: sample is incubated binder removal process in 2 hours at 650 DEG C, then be warming up to 1450 DEG C ~ 1520 DEG C to sinter, temperature rise rate is 120-180 DEG C/h, soaking time is 4 ~ 6h, can obtain low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
10. the preparation method of low-loss dielectric according to claim 6 adjustable intermediary microwave dielectric ceramic materials, is characterized in that: comprise the following steps:
(1) with CaCO
3, ZrO
2, TiO
2, La
2o
3, Al
2o
3for raw material, all raw materials are put into the horizontal ceramic ball mill ball milling of 50KG 12 ~ 18 hours, obtain the slurry of particle diameter 1.5 ~ 2.8 μm;
(2) slurry crossed by ball milling is pressed into the sheet of diameter 50mm after drying under the pressure of 30MPa, through rising to 1240 ~ 1280 DEG C of pre-burnings 2 ~ 6 hours with the temperature rise rate of 4 DEG C/min, obtains burning block;
(3) cross 30 ~ 80 mesh sieves after being pulverized by the block after pre-burning, add the Al of powder quality mark 0 ~ 1%
2o
3, PVA, PVB or CMC of 0.3% ~ 1%, the sodium polyacrylate of 0.05% ~ 1% and the tbp of 0.01% ~ 0.2% take deionized water as ball-milling medium, with 120L Ball-stirring mill ball milling 2 ~ 4 hours, obtain the slurry of particle diameter 0.6 ~ 1.4 μm;
(4) slurry is after mist projection granulating, is pressed into diameter and is 15mm, is highly the cylinder of 6mm under the pressure of 160MPa;
(5) sample is incubated binder removal process in 2 hours at 650 DEG C, be then warming up to 1450 DEG C ~ 1520 DEG C and sinter, temperature rise rate is 120-180 DEG C/h, and soaking time is 4 ~ 6h, can obtain low-loss dielectric adjustable intermediary microwave dielectric ceramic materials.
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| CN110734284A (en) * | 2019-11-11 | 2020-01-31 | 深圳顺络电子股份有限公司 | medium high Q microwave medium ceramic material and preparation method thereof |
| CN112851344A (en) * | 2021-01-26 | 2021-05-28 | 山东丁鼎科技发展有限公司 | Microwave dielectric ceramic with medium dielectric constant and preparation method thereof |
| CN112898010A (en) * | 2021-03-10 | 2021-06-04 | 苏州瑞玛精密工业股份有限公司 | Microwave dielectric ceramic material for 5G communication base station and preparation method and application thereof |
| CN113480303A (en) * | 2021-07-27 | 2021-10-08 | 华中科技大学温州先进制造技术研究院 | Aluminate-based low-dielectric microwave dielectric ceramic and preparation method thereof |
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| CN105837213A (en) * | 2016-03-29 | 2016-08-10 | 电子科技大学 | Microwave dielectric ceramic material doped with ReAlO3 and preparation method thereof. |
| CN105837213B (en) * | 2016-03-29 | 2019-03-29 | 电子科技大学 | Add ReAlO3Microwave dielectric ceramic materials and preparation method thereof |
| CN110734284A (en) * | 2019-11-11 | 2020-01-31 | 深圳顺络电子股份有限公司 | medium high Q microwave medium ceramic material and preparation method thereof |
| CN112851344A (en) * | 2021-01-26 | 2021-05-28 | 山东丁鼎科技发展有限公司 | Microwave dielectric ceramic with medium dielectric constant and preparation method thereof |
| CN112851344B (en) * | 2021-01-26 | 2023-03-10 | 山东丁鼎科技发展有限公司 | Microwave dielectric ceramic with medium dielectric constant and preparation method thereof |
| CN112898010A (en) * | 2021-03-10 | 2021-06-04 | 苏州瑞玛精密工业股份有限公司 | Microwave dielectric ceramic material for 5G communication base station and preparation method and application thereof |
| CN112898010B (en) * | 2021-03-10 | 2022-08-12 | 苏州瑞玛精密工业股份有限公司 | Microwave dielectric ceramic material for 5G communication base station and preparation method and application thereof |
| CN113480303A (en) * | 2021-07-27 | 2021-10-08 | 华中科技大学温州先进制造技术研究院 | Aluminate-based low-dielectric microwave dielectric ceramic and preparation method thereof |
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