CN113754434A - Strontium cerate-based microwave dielectric ceramic material with medium dielectric constant and preparation method thereof - Google Patents

Strontium cerate-based microwave dielectric ceramic material with medium dielectric constant and preparation method thereof Download PDF

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CN113754434A
CN113754434A CN202110940611.4A CN202110940611A CN113754434A CN 113754434 A CN113754434 A CN 113754434A CN 202110940611 A CN202110940611 A CN 202110940611A CN 113754434 A CN113754434 A CN 113754434A
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张启龙
王浩
杨辉
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Zhejiang University ZJU
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Abstract

The invention relates to the field of material science, and aims to provide a strontium cerate-based microwave dielectric ceramic material with a medium dielectric constant and a preparation method thereof. The chemical expression of the microwave dielectric ceramic material is as follows: (100-x) wt% Sr2CeO4+ x wt% M + y wt% N; wherein M is TiO2、CaTiO3Or Sr2TiO4One or more of them are mixed, N is Li2CO3、Bi2O3Or one or more of ZnO, y is N in Sr2CeO4And mass fraction of the total mass of M, wherein x is more than or equal to 10 and less than or equal to 20, and y is more than or equal to 1 and less than or equal to 5. Strontium cerate Sr2CeO4As for microwave dielectric ceramics, the invention greatly reduces the sintering temperature and keeps the temperature coefficient of the resonant frequency stable while keeping the performance of extremely high Q multiplied by f value and medium dielectric constant, thereby being capable of meeting the requirements of microwave components such as resonators, filters, GPS antennas and the likeThe requirement for microwave dielectric ceramic material with medium dielectric constant. The invention has simple preparation process, low sintering temperature and good repeatability.

Description

Strontium cerate-based microwave dielectric ceramic material with medium dielectric constant and preparation method thereof
Technical Field
The invention belongs to the field of material science, and particularly relates to a microwave dielectric ceramic material with a medium dielectric constant and a preparation method thereof.
Background
The microwave dielectric ceramic is a ceramic material which is applied to a microwave frequency band and plays the functions of dielectric isolation, dielectric waveguide, dielectric resonance and the like. In recent years, with the rapid development of 5G mobile communication, satellite communication, wireless network and other technologies, microwave devices are being miniaturized and high-frequency, and resonators, filters, dielectric antennas and the like made of microwave dielectric ceramic materials have become core components of communication equipment. This puts higher demands on microwave dielectric ceramic materials, such as the serialization of dielectric constants, high Q × f value, stable frequency temperature coefficient, and the like.
Strontium cerate Sr2CeO4The microwave dielectric ceramic has extremely high Q multiplied by f value and medium dielectric constant, shows great application prospect in the field of microwave dielectric ceramic, and draws wide attention. But its higher sintering temperature and poor temperature coefficient of resonant frequency limit its further applications.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the existing material system and technology and provides a medium-dielectric-constant microwave dielectric ceramic material with low sintering temperature and stable temperature coefficient of resonant frequency and a preparation method thereof.
In order to solve the technical problem, the solution provided by the invention is as follows:
provides a strontium cerate system microwave dielectric ceramic material with medium dielectric constant, the chemical expression of the microwave dielectric ceramic material is as follows: (100-x) wt% Sr2CeO4+ x wt% M + y wt% N; wherein M is TiO2、CaTiO3Or Sr2TiO4One or more of them are mixed, N is Li2CO3、Bi2O3Or one or more of ZnO, y is N in Sr2CeO4And mass fraction of the total mass of M, wherein x is more than or equal to 10 and less than or equal to 20, and y is more than or equal to 1 and less than or equal to 5.
The invention further provides a preparation method of the microwave dielectric ceramic material, which comprises the following steps:
(1) according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is subjected to ball milling and mixing for 4 hours; pre-burning for 4h at 1150 ℃, and performing secondary ball milling to obtain Sr2CeO4Ceramic powder;
(2) according to Sr2CeO4The mass ratio of M to M is (100-x), x is to weigh M which is TiO2、CaTiO3Or Sr2TiO4X is more than or equal to 10 and less than or equal to 20; according to N and Sr2CeO4And the ratio y of the total mass of M: 100 weighing N, N is Li2CO3、Bi2O3Or one or more of ZnO is mixed, and y is more than or equal to 1 and less than or equal to 5; sr is2CeO4Carrying out ball milling and mixing on the ceramic powder, the M powder and the N powder, and drying to obtain ceramic mixed powder;
(3) adding a polyvinyl alcohol solution into the ceramic mixed powder prepared in the step (2), and uniformly mixing; pressing under 150MPa to prepare a cylindrical blank; polyvinyl alcohol is added to maintain the strength of the ceramic body by making the ceramic particles cohered.
(4) And (4) sintering the blank obtained in the step (3) for 4 hours at the temperature of 800-950 ℃ to obtain the strontium cerate-based microwave dielectric ceramic material with medium dielectric constant.
Preferably, in the step (1), ethanol is used as a ball milling medium for ball milling mixing.
Preferably, in the step (2), the ball milling time is 4h, and the drying temperature is 80 ℃.
Preferably, in the step (3), the mass fraction of the polyvinyl alcohol solution is 10%, and the adding amount is controlled so that the polyvinyl alcohol accounts for 8% of the mass of the ceramic mixed powder.
Preferably, in the step (3), the diameter of the cylindrical billet is 12.4mm, and the height of the cylindrical billet is 6.2 mm.
Preferably, in the step (4), the temperature increase rate during sintering is controlled to be 5 ℃/min.
Description of the inventive principles:
Sr2CeO4has a negative temperature coefficient (-62 ppm/DEG C) of the resonance frequency, which can cause the problem that the carrier signal drifts along with the temperature in practical application, thereby influencing the use performance of the device. TiO with positive resonant frequency temperature coefficient2、CaTiO3Or Sr2TiO4The negative resonance frequency temperature coefficient of the ceramic can be adjusted; li2CO3、Bi2O3Or low melting point sintered body such as ZnOThe addition of the bonding assistant can reduce the sintering temperature of the composite microwave dielectric ceramic material. The invention adopts the compound addition of the two types of ceramics to successfully maintain the original ceramic system Sr2CeO4The dielectric constant and the Qxf value core performance are excellent, the sintering temperature and the temperature coefficient of the resonant frequency are effectively improved, and the adoption of the compound auxiliary agent has great application prospect in the field of microwave dielectric ceramics.
Compared with the prior art, the invention has the beneficial effects that:
1. the microwave dielectric ceramic with the medium dielectric constant obtained by the invention has the dielectric constant of 18-27, the Qxf value of 28000-58500 GHz and the temperature coefficient of resonance frequency of tau being more than or equal to minus 10fNot more than +5 ppm/DEG C, has the characteristics of medium dielectric constant, higher Q multiplied by f value, stable temperature coefficient of resonance frequency and the like;
strontium cerate Sr2CeO4As for the higher sintering temperature (about 1450 ℃) and the poorer temperature coefficient of the resonant frequency (about 62 ppm/DEG C) of the microwave dielectric ceramic, the invention greatly reduces the sintering temperature (from 1450 ℃ to 800-fNot more than +5 ppm/DEG C), thereby meeting the requirements of microwave components such as resonators, filters, GPS antennas and the like on medium dielectric constant microwave dielectric ceramic materials.
2. The invention has simple preparation process, low sintering temperature and good repeatability.
Detailed Description
The following examples are presented to enable those skilled in the art to more fully understand the present invention and are not intended to limit the invention in any way.
Example 1:
the preparation method of the microwave dielectric ceramic material with medium dielectric constant in this embodiment comprises the following steps:
step (1): according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is mixed by ball milling for 4 hours by taking ethanol as a medium; presintering at 1150 deg.C for 4 hr, and performing secondary sinteringObtaining Sr by secondary ball milling2CeO4Ceramic powder;
step (2): according to Sr2CeO4With CaTiO3Weighing CaTiO in a mass ratio of 90:103According to Li2CO3And Sr2CeO4And CaTiO3Ratio of total mass 1: 100 weigh Li2CO3(ii) a Sr is2CeO4Ceramic powder, CaTiO3And Li2CO3Ball milling and mixing the powder for 4 hours, and then drying at 80 ℃;
and (3): adding the mixed powder prepared in the step (2) into a polyvinyl alcohol solution with the mass fraction of 10% to be uniformly mixed, and controlling the mass percentage of polyvinyl alcohol in the ceramic powder to be 8%; pressing under 150MPa to prepare a cylindrical blank with the diameter of 12.4mm and the height of 6.2 mm;
and (4): and (4) sintering the blank obtained in the step (3) at 800 ℃ for 4h, and controlling the temperature rise rate in the sintering process to be 5 ℃/min to prepare the strontium cerate microwave dielectric ceramic material with the medium dielectric constant.
The medium-temperature sintered low-dielectric microwave dielectric ceramic material prepared according to the formula and the steps has the following performance indexes: dielectric constant εr18, quality factor Q × f 28000GHz, temperature coefficient of resonance frequency τf＝-10ppm/℃。
Example 2:
the preparation method of the microwave dielectric ceramic material with medium dielectric constant in this embodiment comprises the following steps:
step (1): according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is mixed by ball milling for 4 hours by taking ethanol as a medium; pre-burning for 4h at 1150 ℃, and performing secondary ball milling to obtain Sr2CeO4Ceramic powder;
step (2): according to Sr2CeO4With TiO2Weighing TiO with the mass ratio of 80:202According to Bi2O3And Sr2CeO4And TiO2The proportion of the total mass is 5: 100 weigh Bi2O3(ii) a Sr is2CeO4Ceramic powder, TiO2And Bi2O3Ball milling and mixing the powder for 4 hours, and then drying at 80 ℃;
and (3): adding the mixed powder prepared in the step (2) into a polyvinyl alcohol solution with the mass fraction of 10% to be uniformly mixed, and controlling the mass percentage of polyvinyl alcohol in the ceramic powder to be 8%; pressing under 150MPa to prepare a cylindrical blank with the diameter of 12.4mm and the height of 6.2 mm;
and (4): and (4) sintering the blank obtained in the step (3) at 950 ℃ for 4h, and controlling the temperature rise rate in the sintering process to be 5 ℃/min to prepare the strontium cerate microwave dielectric ceramic material with the medium dielectric constant.
The medium-temperature sintered low-dielectric microwave dielectric ceramic material prepared according to the formula and the steps has the following performance indexes: dielectric constant εr27, quality factor Q × f 58500GHz, temperature coefficient of resonance frequency τf＝+5ppm/℃。
Example 3:
the preparation method of the microwave dielectric ceramic material with medium dielectric constant in this embodiment comprises the following steps:
step (1): according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is mixed by ball milling for 4 hours by taking ethanol as a medium; pre-burning for 4h at 1150 ℃, and performing secondary ball milling to obtain Sr2CeO4Ceramic powder;
step (2): according to Sr2CeO4And Sr2TiO4The weight ratio of Sr is 85:152TiO4According to ZnO and Sr2CeO4And Sr2TiO4Ratio of total mass 3: 100 weighing ZnO; sr is2CeO4Ceramic powder material, Sr2TiO4Ball-milling and mixing the ZnO powder and the ZnO powder for 4 hours, and then drying at 80 ℃;
and (3): adding the mixed powder prepared in the step (2) into a polyvinyl alcohol solution with the mass fraction of 10% to be uniformly mixed, and controlling the mass percentage of polyvinyl alcohol in the ceramic powder to be 8%; pressing under 150MPa to prepare a cylindrical blank with the diameter of 12.4mm and the height of 6.2 mm;
and (4): and (4) sintering the blank obtained in the step (3) at 930 ℃ for 4h, and controlling the temperature rise rate in the sintering process to be 5 ℃/min to prepare the strontium cerate microwave dielectric ceramic material with the medium dielectric constant.
The medium-temperature sintered low-dielectric microwave dielectric ceramic material prepared according to the formula and the steps has the following performance indexes: dielectric constant εr25, quality factor Qxf 53000GHz, temperature coefficient of resonance frequency tauf＝+1.2ppm/℃。
Example 4:
the preparation method of the microwave dielectric ceramic material with medium dielectric constant in this embodiment comprises the following steps:
step (1): according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is mixed by ball milling for 4 hours by taking ethanol as a medium; pre-burning for 4h at 1150 ℃, and performing secondary ball milling to obtain Sr2CeO4Ceramic powder;
step (2): according to Sr2CeO4And Sr2TiO4-TiO2Weighing Sr at a mass ratio of 83:172TiO4And TiO2Wherein Sr is2TiO4And TiO2The mass ratio of (A) to (B) is 2: 1; according to Li2CO3-Bi2O3Ratio to the total mass of the aforementioned powders 4: 100 weigh Li2CO3And Bi2O3Wherein Li2CO3And Bi2O3The mass ratio of (A) to (B) is 4: 1; ball-milling and mixing all the powder for 4 hours, and then drying at 80 ℃;
and (3): adding the mixed powder prepared in the step (2) into a polyvinyl alcohol solution with the mass fraction of 10% to be uniformly mixed, and controlling the mass percentage of polyvinyl alcohol in the ceramic powder to be 8%; pressing under 150MPa to prepare a cylindrical blank with the diameter of 12.4mm and the height of 6.2 mm;
and (4): and (4) sintering the blank obtained in the step (3) at 920 ℃ for 4h, and controlling the temperature rise rate in the sintering process to be 5 ℃/min to prepare the strontium cerate microwave dielectric ceramic material with the medium dielectric constant.
The medium-temperature sintered low-dielectric microwave dielectric ceramic material prepared according to the formula and the steps has the following performance indexes: dielectric constant εr24.6, quality factor Qxf 46000GHz, temperature coefficient of resonance frequency tauf＝-3.6ppm/℃。
Example 5:
the preparation method of the microwave dielectric ceramic material with medium dielectric constant in this embodiment comprises the following steps:
step (1): according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is mixed by ball milling for 4 hours by taking ethanol as a medium; pre-burning for 4h at 1150 ℃, and performing secondary ball milling to obtain Sr2CeO4Ceramic powder;
step (2): according to Sr2CeO4And Sr2TiO4-CaTiO3The weight ratio of Sr is 80:202TiO4And CaTiO3Wherein Sr is2TiO4And CaTiO3The mass ratio of (1): 2; according to ZnO-Bi2O3Ratio to the total mass of the aforementioned powders 3: 100 portions of ZnO and Bi2O3Wherein ZnO and Bi2O3The mass ratio of (A) to (B) is 3: 2; ball-milling and mixing all the powder for 4 hours, and then drying at 80 ℃;
and (3): adding the mixed powder prepared in the step (2) into a polyvinyl alcohol solution with the mass fraction of 10% to be uniformly mixed, and controlling the mass percentage of polyvinyl alcohol in the ceramic powder to be 8%; pressing under 150MPa to prepare a cylindrical blank with the diameter of 12.4mm and the height of 6.2 mm;
and (4): and (4) sintering the green body obtained in the step (3) at 870 ℃ for 4h, and controlling the temperature rise rate in the sintering process to be 5 ℃/min to prepare the strontium cerate microwave dielectric ceramic material with the medium dielectric constant.
The medium-temperature sintered low-dielectric microwave dielectric ceramic material prepared according to the formula and the steps has the following performance indexes: dielectric constant εr21.5, quality factor Q × f 32000GHz, resonant frequency temperature coefficient τf＝+0.6ppm/℃。

Claims (7)

1. A strontium cerate-based microwave dielectric ceramic material with medium dielectric constant is characterized in that the chemical expression of the microwave dielectric ceramic material is as follows: (100-x) wt% Sr2CeO4+ x wt% M + y wt% N; wherein M is TiO2、CaTiO3Or Sr2TiO4One or more of them are mixed, N is Li2CO3、Bi2O3Or one or more of ZnO, y is N in Sr2CeO4And mass fraction of the total mass of M, wherein x is more than or equal to 10 and less than or equal to 20, and y is more than or equal to 1 and less than or equal to 5.
2. A method for preparing a microwave dielectric ceramic material as claimed in claim 1, characterized by comprising the steps of:
(1) according to Sr2CeO4The raw material SrCO is weighed according to the molar ratio of the elements3And CeO2Powder is subjected to ball milling and mixing for 4 hours; pre-burning for 4h at 1150 ℃, and performing secondary ball milling to obtain Sr2CeO4Ceramic powder;
(2) according to Sr2CeO4The mass ratio of M to M is (100-x), x is to weigh M which is TiO2、CaTiO3Or Sr2TiO4X is more than or equal to 10 and less than or equal to 20; according to N and Sr2CeO4And the ratio y of the total mass of M: 100 weighing N, N is Li2CO3、Bi2O3Or one or more of ZnO is mixed, and y is more than or equal to 1 and less than or equal to 5; sr is2CeO4Carrying out ball milling and mixing on the ceramic powder, the M powder and the N powder, and drying to obtain ceramic mixed powder;
(3) adding a polyvinyl alcohol solution into the ceramic mixed powder prepared in the step (2), and uniformly mixing; pressing under 150MPa to prepare a cylindrical blank;
(4) and (4) sintering the blank obtained in the step (3) for 4 hours at the temperature of 800-950 ℃ to obtain the strontium cerate-based microwave dielectric ceramic material with medium dielectric constant.
3. The method of claim 2, wherein in the step (1), the ball milling is performed by using ethanol as a ball milling medium.
4. The method according to claim 2, wherein in the step (2), the ball milling time is 4h, and the drying temperature is 80 ℃.
5. The method according to claim 2, wherein in the step (3), the polyvinyl alcohol solution is added in an amount of 10% by mass and the polyvinyl alcohol is added in an amount of 8% by mass based on the ceramic mixed powder.
6. The method according to claim 2, wherein in the step (3), the cylindrical billet has a diameter of 12.4mm and a height of 6.2 mm.
7. The method according to claim 2, wherein in the step (4), the temperature increase rate at the time of sintering is controlled to be 5 ℃/min.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116143514A (en) * 2023-02-22 2023-05-23 苏州博恩希普新材料科技有限公司 Microwave dielectric ceramic and preparation method thereof
CN116535212A (en) * 2023-05-15 2023-08-04 中国矿业大学 High-performance microwave dielectric ceramic material applied to LTCC (Low temperature Co-fired ceramic) and preparation method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458286A1 (en) * 1990-05-22 1991-11-27 Agency Of Industrial Science And Technology Method for preparing a sintered body of light-transmitting cordierite
CN102617127A (en) * 2012-03-23 2012-08-01 天津大学 Low-temperature sintered lithium-zinc-titanium series microwave dielectric ceramic and preparation method thereof
CN111470864A (en) * 2020-05-01 2020-07-31 桂林理工大学 Silicon-based temperature-stable microwave dielectric ceramic material and preparation method thereof
CN111635223A (en) * 2020-06-16 2020-09-08 广东国华新材料科技股份有限公司 Composite microwave dielectric ceramic and preparation method thereof
CN111635230A (en) * 2020-05-28 2020-09-08 浙江大学 High-quality-factor strontium cerate microwave dielectric ceramic material and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458286A1 (en) * 1990-05-22 1991-11-27 Agency Of Industrial Science And Technology Method for preparing a sintered body of light-transmitting cordierite
CN102617127A (en) * 2012-03-23 2012-08-01 天津大学 Low-temperature sintered lithium-zinc-titanium series microwave dielectric ceramic and preparation method thereof
CN111470864A (en) * 2020-05-01 2020-07-31 桂林理工大学 Silicon-based temperature-stable microwave dielectric ceramic material and preparation method thereof
CN111635230A (en) * 2020-05-28 2020-09-08 浙江大学 High-quality-factor strontium cerate microwave dielectric ceramic material and preparation method thereof
CN111635223A (en) * 2020-06-16 2020-09-08 广东国华新材料科技股份有限公司 Composite microwave dielectric ceramic and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116143514A (en) * 2023-02-22 2023-05-23 苏州博恩希普新材料科技有限公司 Microwave dielectric ceramic and preparation method thereof
CN116143514B (en) * 2023-02-22 2024-03-22 苏州博恩希普新材料科技有限公司 Microwave dielectric ceramic and preparation method thereof
CN116535212A (en) * 2023-05-15 2023-08-04 中国矿业大学 High-performance microwave dielectric ceramic material applied to LTCC (Low temperature Co-fired ceramic) and preparation method thereof
CN116535212B (en) * 2023-05-15 2023-12-26 中国矿业大学 High-performance microwave dielectric ceramic material applied to LTCC (Low temperature Co-fired ceramic) and preparation method thereof

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