CN101863655A - Microwave dielectric ceramic material and preparation method thereof - Google Patents
Microwave dielectric ceramic material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a microwave dielectric ceramic material and a preparation method thereof. At present, few microwave dielectric materials have low dielectric constant and high frequency stability. The phases of the microwave dielectric ceramic material comprise Mg2SiO4 phase and MgCaSiO4 phase, wherein the molar ratio of MgO:CaO:SiO2 is 2*(1-x):2x:1; x is more than and equal to 0.1 and less than or equal to 0.6; the dielectric constant is 6.81 to 9.10; the quality factor is 17,510 to 24,170GHz; and the temperature coefficient of resonance frequency is -14ppm/DEG C to +11ppm/DEG C. The preparation method comprises the following steps of: mixing and grinding MgO, CaO and SiO2 and drying the mixture; calcining the dried mixture for 2 to 4 hours, mixing and grinding for a second time to obtain slurry, adding PVA, and ageing and performing spray granulation to obtain powdery particles; and pressing the powdery particles into a cylinder, sintering the cylinder for 2 to 4 hours and cooling. The invention fills the blank of the dielectric material which has high temperature stability and dielectric constant of between 6 and 10 and is used for a microwave millimeter wave dielectric ceramic device; and the ceramic material has high microwave performance.
Description
Technical field
The invention belongs to electronic information function material and device technology field, be specifically related to a kind of under working temperature environment changes the microwave dielectric ceramic materials of the near-zero resonance frequency temperature coefficient that uses as functional device in microwave frequency of suiting of frequency-selecting good stability, and the preparation method of this microwave dielectric ceramic materials.
Background technology
In recent years along with the micro-wave communication technical development, be adapted at using under the microwave frequency band and as signal various device materials with function such as response (resonance and filtering, conduction with isolate) take place and also be widely used and pay close attention to.Particularly, develop to the space communtication direction in current micro-wave communication, the microwave and millimeter wave communication technology of high band obtains under the application background, and it is fast to develop various types of signal transmission and response speed, good and the operating ambient temperature lower frequency good stability of signal transmission quality high frequency selectivity be adapted at WLAN base station, the low-k multiplayer microwave dielectric resonator that uses in satellite communications and the radar system, vibrator, wave filter, microwave antenna, device material such as microwave wire and microwave base plate become a big gordian technique that influences the spatial microwave development communication technologies.At present, the low dielectric constant microwave dielectric material category that has been reported in operating ambient temperature lower frequency good stability is few, mainly is the magnesium titanate MgTiO of specific inductivity between 10～20
3-TiO
2With Al
2O
3-TiO
2Complex phase ceramic.
Summary of the invention
The object of the invention is to satisfy the needs of communications electronics Circuits System technical development for requirement on devices, provide a kind of low-k and microwave property good near-zero resonance frequency temperature coefficient silicate microwave dielectric ceramic materials, the method for this microwave dielectric ceramic materials of preparation is provided simultaneously.
The thing of microwave dielectric ceramic materials of the present invention comprises Mg mutually
2SiO
4And MgCaSiO
4, wherein composition MgO, CaO, SiO
2Mol ratio be MgO: CaO: SiO
2=2 * (1-x): 2x: 1,0.1≤x≤0.6; This microwave dielectric ceramic materials specific inductivity is 6.81～9.10, and quality factor (Q * f value) are 17,510～24,170GHz, temperature coefficient of resonance frequency be-14ppm/ ℃～+ 11ppm/ ℃.
The concrete steps that prepare this microwave dielectric ceramic materials method are as follows:
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: SiO in molar ratio
2=2 * (1-x): 2x: 1,0.1≤x≤0.6 weighing mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 12～24 hours, bake out temperature is 80～120 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 2～4 hours, and calcining temperature is 1000～1250 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 12～24 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 80～120 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA (polyvinyl alcohol) after the secondary powder is uniformly dispersed, the amount that adds polyvinyl alcohol is 4～8Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 98～100MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1375 ℃～1450 ℃ sintering temperatures 2～4 hours, then with the speed temperature control cooling of 2～5 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1175 ℃～1250 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
[concrete grammar is referring to document: B.W.Hakki for dielectric resonant chamber method test specific inductivity that employing Hakki and Coleman proposes and microwave property, and P.D.Coleman, " DielectricResonator Method of Measuring Inductive Capacities in the MillimeterRange; " IEEE Trans.Microw.Theory Technol., MTT-8,402-10 (1970)], this microwave dielectric ceramic materials is with respect to the specific inductivity of other materials lower (6.8～9.1), and comprehensive microwave property is good.
Silicate systems pottery provided by the invention has been filled up specific inductivity blank as the dielectric material of microwave and millimeter wave media ceramic device temperature good stability between 6～10.And this ceramic microwave is functional: quality factor are 17,510～24,170GHz, temperature coefficient of resonance frequency be-14ppm/ ℃～+ 11ppm/ ℃ scope in.This dielectric material its frequency stabilization under operating ambient temperature is good, is not easy to drift about; And the quality factor height, so its frequency-selecting is good and signal transmission quality is also high; Moreover the MgTiO of the current report of permittivity ratio
3-TiO
2With Al
2O
3-TiO
2The complex phase ceramic specific inductivity is lower, thereby the response of signal and transmission speed are also faster.
Microwave dielectric ceramic materials provided by the invention enriches the demand of current high-frequency communication electronic circuit technology to the good low-dielectric constant dielectric medium material of operating ambient temperature good stability and frequency selectivity well, is well suited for using as the material of multiplayer microwave resonator, oscillator filter, microwave antenna, microwave wire and microwave base plate in the electronic circuit system and electronic circuit board device.
Embodiment
A kind of thing of microwave dielectric ceramic materials comprises Mg mutually
2SiO
4And MgCaSiO
4, wherein composition MgO, CaO, SiO
2Mol ratio be MgO: CaO: TiO
2=2 * (1-x): 2x: 1,0.1≤x≤0.6; This microwave dielectric ceramic materials DIELECTRIC CONSTANT
rBe 6.81～9.10, quality factor (Q * f value) are 17,510～24,170GHz, temperature coefficient of resonance frequency τ
fFor-14ppm/ ℃～+ 11ppm/ ℃.The method such as the following specific embodiment that prepare this microwave dielectric ceramic materials.
Embodiment 1.
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: SiO in molar ratio
2=18: weighing in 2: 10 mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 24 hours, bake out temperature is 80 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 2 hours, and calcining temperature is 1250 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 24 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 80 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA after the secondary powder is uniformly dispersed, the amount that adds PVA is the 4Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 98MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1375 ℃ of sintering temperatures 4 hours, then with the speed temperature control cooling of 2 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1175 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
The thing of the microwave dielectric ceramic materials of making comprises Mg mutually
2SiO
4And MgCaSiO
4, content is respectively 98.3Wt% and 1.7Wt%, its microwave dielectric property: at resonant frequency f
0Be 15.196GHz test down, DIELECTRIC CONSTANT
rBe 6.90, quality factor q * f is 22,450GHz, temperature coefficient of resonance frequency τ
fBe-14ppm/ ℃.
Embodiment 2.
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: SiO in molar ratio
2=16: weighing in 4: 10 mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 20 hours, bake out temperature is 90 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 2.5 hours, and calcining temperature is 1200 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 20 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 90 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA after the secondary powder is uniformly dispersed, the amount that adds PVA is the 5Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 98MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1400 ℃ of sintering temperatures 3 hours, then with the speed temperature control cooling of 3 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1200 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
The thing of the microwave dielectric ceramic materials of making comprises Mg mutually
2SiO
4And MgCaSiO
4, content is respectively 94.8Wt% and 5.2Wt%, its microwave dielectric property: at resonant frequency f
0Be 15.664GHz test down, DIELECTRIC CONSTANT
rBe 6.81, quality factor q * f is 21,700GHz, temperature coefficient of resonance frequency τ
fBe-12ppm/ ℃.
Embodiment 3.
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: TiO in molar ratio
2=14: weighing in 6: 10 mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 18 hours, bake out temperature is 100 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 3 hours, and calcining temperature is 1150 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 18 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 100 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA after the secondary powder is uniformly dispersed, the amount that adds PVA is the 6Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 99MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1425 ℃ of sintering temperatures 2.5 hours, then with the speed temperature control cooling of 4 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1225 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
The thing of the microwave dielectric ceramic materials of making is Mg mutually
2SiO
4And MgCaSiO
4, content is respectively 68.9Wt% and 31.1Wt%, its microwave dielectric property: at resonant frequency f
0Be 14.422GHz test down, DIELECTRIC CONSTANT
rBe 7.55, quality factor q * f is 19,180GHz, temperature coefficient of resonance frequency τ
fBe-10ppm/ ℃.
Embodiment 4.
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: TiO in molar ratio
2=12: weighing in 8: 10 mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 16 hours, bake out temperature is 100 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 3 hours, and calcining temperature is 1100 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 16 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 100 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA after the secondary powder is uniformly dispersed, the amount that adds PVA is the 7Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 99MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1450 ℃ of sintering temperatures 2 hours, then with the speed temperature control cooling of 5 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1250 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
The thing of the microwave dielectric ceramic materials of making is Mg mutually
2SiO
4And MgCaSiO
4, content is respectively 26.1Wt% and 73.9Wt%, microwave dielectric property: at resonant frequency f
0Be 15.760GHz test down, DIELECTRIC CONSTANT
rBe 7.23, quality factor q * f is 24,170GHz, temperature coefficient of resonance frequency τ
fBe+5ppm/ ℃.
Embodiment 5.
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: TiO in molar ratio
2=1: weighing in 1: 1 mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 15 hours, bake out temperature is 110 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 3.5 hours, and calcining temperature is 1050 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 15 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 110 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA after the secondary powder is uniformly dispersed, the amount that adds PVA is the 8Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 100MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1400 ℃ of sintering temperatures 3 hours, then with the speed temperature control cooling of 3 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1200 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
The thing of the microwave dielectric ceramic materials of making is Mg mutually
2SiO
4And MgCaSiO
4, content is respectively 6.7Wt% and 93.3Wt%, at microwave dielectric property: at resonant frequency f
0For 15.724GHz detects down, DIELECTRIC CONSTANT
rBe 8.71, quality factor q * f is 18,010GHz, temperature coefficient of resonance frequency τ
fBe+3ppm/ ℃.
Embodiment 6.
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: TiO in molar ratio
2=8: weighing in 12: 10 mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 12 hours, bake out temperature is 120 ℃;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 4 hours, and calcining temperature is 1000 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 12 hours form slurry of wet grinding second time again in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 120 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added organic binder bond PVA after the secondary powder is uniformly dispersed, the amount that adds PVA is the 4Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 100MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1425 ℃ of sintering temperatures 2.5 hours, then with the speed temperature control cooling of 4 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1225 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
The thing of the microwave dielectric ceramic materials of making is Mg mutually
2SiO
4And MgCaSiO
4, content is respectively 1.7Wt% and 98.3Wt%, microwave dielectric property: at resonant frequency f
0For 15.676GHz detects down, DIELECTRIC CONSTANT
rBe 9.10, quality factor q * f is 17,510GHz, temperature coefficient of resonance frequency τ
fBe+11ppm/ ℃.
Claims (2)
1. microwave dielectric ceramic materials, it is characterized in that: the thing of this microwave dielectric ceramic materials comprises Mg mutually
2SiO
4And MgCaSiO
4, wherein composition MgO, CaO, SiO
2Mol ratio be MgO: CaO: SiO
2=2 * (1-x): 2x: 1,0.1≤x≤0.6; This microwave dielectric ceramic materials specific inductivity is 6.81～9.10, and quality factor are 17,510～24,170GHz, temperature coefficient of resonance frequency be-14ppm/ ℃～+ 11ppm/ ℃.
2. the preparation method of a microwave dielectric ceramic materials is characterized in that these method concrete steps are:
Step (1) raw material is chosen: choose purity greater than 99% MgO, CaO and SiO
2As raw material;
Step (2) batching and batch mixing: with raw material MgO: CaO: SiO in molar ratio
2=2 * (1-x): 2x: 1 weighing mix the back in ball mill with agate as abrading-ball, deionized water as grinding medium, oven dry in the drying baker is inserted in wet grinding after 12～24 hours, bake out temperature is 80～120 ℃, 0.1≤x≤0.6;
Step (3) calcining and granulation: the powder after will drying is crossed the accurate nylon mesh of 200 targets, and powder is uniformly dispersed, and calcines then 2～4 hours, and calcining temperature is 1000～1250 ℃, and powder fully reacts synthetic compound; To calcine the back powder then and add deionized water carry out 12～24 hours form slurry of wet grinding second time in ball mill, will insert in the drying baker through the slurry after the wet grinding for the second time and dry, bake out temperature is 80～120 ℃, formation secondary powder; The secondary powder is crossed the accurate nylon mesh of 200 targets again, added the organic binder bond polyvinyl alcohol after the secondary powder is uniformly dispersed, the amount that adds polyvinyl alcohol is 4～8Wt% of secondary powder total mass, through old, mist projection granulating powdered particulate material;
Step (4) compression moulding: the powder particle material is inserted in the powder pressure forming machine, under 98～100MPa pressure, be pressed into right cylinder;
Step (5) sinters porcelain into: the right cylinder that is pressed into 1375 ℃～1450 ℃ sintering temperatures 2～4 hours, then with the speed temperature control cooling of 2～5 ℃ of per minutes, is closed the temperature regulating device furnace cooling after arriving 1175 ℃～1250 ℃;
Step (6) later stage mechanical workout: the ceramic grinding that sinters is polished to finished product.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102617144A (en) * | 2012-04-05 | 2012-08-01 | 天津大学 | Novel temperature stable type tantalum niobate microwave dielectric ceramic |
| CN103601494A (en) * | 2013-10-22 | 2014-02-26 | 山东科技大学 | Tungstate low-temperature co-fired ceramic material and preparation method thereof |
| CN104926294A (en) * | 2015-06-02 | 2015-09-23 | 安徽省含山瓷业股份有限公司 | Desert sand ceramic bowl and preparation method thereof |
| CN106006926A (en) * | 2016-06-24 | 2016-10-12 | 国网山东省电力公司电力科学研究院 | Efficient catalytic ozone water treatment technology based on composite oxide |
| CN108439969A (en) * | 2018-06-29 | 2018-08-24 | 无锡鑫圣慧龙纳米陶瓷技术有限公司 | A kind of low-k temperature-stable microwave-medium and preparation method thereof |
| CN110739529A (en) * | 2019-09-30 | 2020-01-31 | 无锡惠虹电子有限公司 | novel ceramic antennas and preparation method thereof |
| CN113004028A (en) * | 2021-03-02 | 2021-06-22 | 华中科技大学温州先进制造技术研究院 | Silicon-based low-dielectric microwave dielectric ceramic and preparation method thereof |
| CN115536377A (en) * | 2022-11-29 | 2022-12-30 | 苏州中材非金属矿工业设计研究院有限公司 | Black talc mineral microwave medium ceramic material and preparation method thereof |
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| US5449652A (en) * | 1993-06-04 | 1995-09-12 | Battelle Memorial Institute | Ceramic compositions for BZN dielectric resonators |
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| 《中国博士学位论文全文数据库工程科技Ⅰ辑》 20070815 宋开新 低介电常数微波介质陶瓷 , 第02期 * |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102617144A (en) * | 2012-04-05 | 2012-08-01 | 天津大学 | Novel temperature stable type tantalum niobate microwave dielectric ceramic |
| CN102617144B (en) * | 2012-04-05 | 2013-07-10 | 天津大学 | Novel temperature stable type tantalum niobate microwave dielectric ceramic |
| CN103601494A (en) * | 2013-10-22 | 2014-02-26 | 山东科技大学 | Tungstate low-temperature co-fired ceramic material and preparation method thereof |
| CN104926294A (en) * | 2015-06-02 | 2015-09-23 | 安徽省含山瓷业股份有限公司 | Desert sand ceramic bowl and preparation method thereof |
| CN106006926A (en) * | 2016-06-24 | 2016-10-12 | 国网山东省电力公司电力科学研究院 | Efficient catalytic ozone water treatment technology based on composite oxide |
| CN106006926B (en) * | 2016-06-24 | 2019-07-12 | 国网山东省电力公司电力科学研究院 | Efficient catalytic ozone water treatment technology based on composite oxides |
| CN108439969A (en) * | 2018-06-29 | 2018-08-24 | 无锡鑫圣慧龙纳米陶瓷技术有限公司 | A kind of low-k temperature-stable microwave-medium and preparation method thereof |
| CN110739529A (en) * | 2019-09-30 | 2020-01-31 | 无锡惠虹电子有限公司 | novel ceramic antennas and preparation method thereof |
| CN113004028A (en) * | 2021-03-02 | 2021-06-22 | 华中科技大学温州先进制造技术研究院 | Silicon-based low-dielectric microwave dielectric ceramic and preparation method thereof |
| CN113004028B (en) * | 2021-03-02 | 2023-03-14 | 华中科技大学温州先进制造技术研究院 | Silicon-based low-dielectric microwave dielectric ceramic and preparation method thereof |
| CN115536377A (en) * | 2022-11-29 | 2022-12-30 | 苏州中材非金属矿工业设计研究院有限公司 | Black talc mineral microwave medium ceramic material and preparation method thereof |
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