CN110451952B - Low-loss high-strength microwave dielectric ceramic and preparation method thereof - Google Patents
Low-loss high-strength microwave dielectric ceramic and preparation method thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 111
- 239000000126 substance Substances 0.000 claims abstract description 47
- 238000005245 sintering Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims description 93
- 229910052593 corundum Inorganic materials 0.000 claims description 78
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 68
- 238000000498 ball milling Methods 0.000 claims description 46
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 46
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 44
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 44
- 238000007873 sieving Methods 0.000 claims description 37
- 229910002971 CaTiO3 Inorganic materials 0.000 claims description 35
- 239000010431 corundum Substances 0.000 claims description 34
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 34
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims description 33
- 238000001354 calcination Methods 0.000 claims description 27
- 238000000643 oven drying Methods 0.000 claims description 26
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 7
- 238000006467 substitution reaction Methods 0.000 abstract description 4
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 12
- 238000011056 performance test Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention discloses a low-loss high-strength microwave dielectric ceramic, the composition expression of which is xCaTiO3‑ySmAlO3‑(1‑x‑y)CaSmAlTiO6Wherein x, y and (1-x-y) all represent molar ratios, x is 0.6, and y is more than or equal to 0 and less than 0.4. The invention also discloses a preparation method of the low-loss high-strength microwave dielectric ceramic. In the microwave dielectric ceramic provided by the invention, CaSmAlTiO is used6Partial or total substitution of SmAlO3Thereby improving the temperature stability while reducing the dielectric constant, and increasing the processing strength by increasing the sintering temperature; CaSmAlTiO6And SmAlO3The dielectric constants of the two substances are similar, and CaSmAlTiO6Has a resonance frequency temperature coefficient close to zero, and has a high dielectric constant6Is higher in hardness by CaSmAlTiO6Partial or total substitution of SmAlO3And the high-hardness ceramic material with the dielectric constant of about 35, low loss and the temperature coefficient of the resonant frequency close to zero can be obtained by adjusting the mixture ratio of the components.
Description
Technical Field
The invention belongs to the technical field of electronic ceramics and preparation thereof, and particularly relates to a low-loss high-strength microwave dielectric ceramic and a preparation method thereof.
Background
Microwave dielectric ceramics refer to ceramics which are applied to microwave frequency band circuits and used as dielectric materials to complete one or more functions, and are widely applied to modern communication, such as satellite communication, satellite remote sensing devices, near mobile communication, GPS navigation, television cable systems and the like, and become an indispensable part of modern people's lives. With the rapid development of microwave communication, especially in the face of the upcoming 5G era, the developed microwave dielectric material cannot meet the future application requirements in terms of loss, temperature stability and processing strength, so that it is necessary to develop a microwave dielectric material with appropriate dielectric constant, low loss and high processing strength.
From the viewpoint of microwave dielectric properties, the microwave dielectric ceramics for 5G requires materials having a medium dielectric constant, a high quality factor and a near-zero temperature coefficient of resonance frequency and a high processing strength. MTiO3-LnA1O3Has excellent microwave performance and the adjustability of a perovskite structure, so the research on the microwave dielectric ceramic of the system is increasingly carried out in recent years.
However, in the perovskite structure, when the temperature coefficient of the resonant frequency of the microwave dielectric ceramic is zero, the dielectric constant of the microwave dielectric ceramic is 50, and the quality factor is about 40000GHz, which is too high for the current 5G application, the quality factor is lower, and the processing strength of the microwave dielectric ceramic cannot reach the standard of the microwave dielectric ceramic for 5G.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a low-loss high-strength microwave dielectric ceramic and a preparation method thereof; the ceramic material has the advantages of medium dielectric constant, wide application range, low loss, adjustable temperature coefficient of resonant frequency and high processing strength.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
the microwave dielectric ceramic with low loss and high strength has the composition expression of xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Wherein x, y and (1-x-y) all represent molar ratios, x is 0.6, and y is more than or equal to 0 and less than 0.4.
Preferably, in the composition expression of the microwave dielectric ceramic, y is more than or equal to 0 and less than 0.35.
The invention also provides a preparation method of the low-loss high-strength microwave dielectric ceramic, which comprises the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, stoving, sieving, roasting in corundum crucible to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, calcining in corundum crucible to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, stoving, sieving, roasting in corundum crucible to obtain CaSmAlTiO powder6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the formula xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Mixing the materials according to the molar ratio, fully ball-milling after mixing, drying, granulating, sieving, pressing and molding the sieved particles, and then sintering to obtain the low-loss high-strength microwave dielectric ceramic, wherein the chemical formula is xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Wherein x, y and (1-x-y) all represent molar ratios, x is 0.6, and y is not less than 0 and is less than 0.4.
Preferably, the roasting process in the step (1) is roasting and heat preservation for 3-5 hours at the temperature of 1000-1100 ℃.
Preferably, the roasting process in the step (2) is roasting and heat preservation for 3-5 hours at the temperature of 1000-1100 ℃.
Preferably, the roasting process in the step (3) is roasting and heat preservation for 3-5 hours at the temperature of 1000-1100 ℃.
Preferably, in step (4), the sieved granules are compressed into a cylinder with a diameter of 10mm and a height of 6 mm.
Preferably, the sintering process in the step (4) is sintering at 1400-1500 ℃ for 4 hours.
Compared with the prior art, the invention has the following beneficial effects: in the microwave dielectric ceramic provided by the invention, CaSmAlTiO is used6Partial or total substitution of SmAlO3Thereby improving the temperature stability while reducing the dielectric constant, and increasing the processing strength by increasing the sintering temperature; CaSmAlTiO6And SmAlO3The dielectric constants of the two substances are similar, and CaSmAlTiO6Has a resonance frequency temperature coefficient close to zero, and has a high dielectric constant6Is higher in hardness by CaSmAlTiO6Partial or total substitution of SmAlO3And the high-hardness ceramic material with the dielectric constant of about 35, low loss and the temperature coefficient of the resonant frequency close to zero can be obtained by adjusting the mixture ratio of the components.
The microwave dielectric ceramic provided by the invention has the relative dielectric constant of 33-38, the microwave performance Qf of 44000-61000GHz, the temperature coefficient of the resonance frequency is adjustable, and the bending strength is more than or equal to 240 MPa.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
The microwave dielectric ceramic with low loss and high strength has the composition expression of xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Wherein x, y, (1-x-y) each represents a moleAnd x is 0.6, and y is more than or equal to 0 and less than 0.4.
Preferably, in the composition expression of the microwave dielectric ceramic, y is more than or equal to 0 and less than 0.35.
The invention also provides a preparation method of the low-loss high-strength microwave dielectric ceramic, which comprises the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, stoving, sieving, roasting in corundum crucible to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, calcining in corundum crucible to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, stoving, sieving, roasting in corundum crucible to obtain CaSmAlTiO powder6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the formula xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Mixing the materials according to the molar ratio, fully ball-milling after mixing, drying, granulating, sieving, pressing and molding the sieved particles, and then sintering to obtain the low-loss high-strength microwave dielectric ceramic, wherein the chemical formula is xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Wherein x, y and (1-x-y) all represent molar ratios, x is 0.6, and y is not less than 0 and is less than 0.4.
Wherein, the roasting process in the step (1) is roasting and heat preservation for 3-5 hours at 1000-1100 ℃.
Wherein, the roasting process in the step (2) is roasting and heat preservation for 3-5 hours at 1000-1100 ℃.
Wherein, the roasting process in the step (3) is roasting and heat preservation for 3-5 hours at 1000-1100 ℃.
Wherein, in the step (4), the sieved particles are pressed into cylinders with the diameter of 10mm and the height of 6 mm.
Wherein, the sintering process in the step (4) is sintering for 4 hours at 1400-1500 ℃.
The following examples further illustrate the invention but are not intended to limit the invention thereto.
Example 1
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 1 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.4CaSmAlTiO6The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1500 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in the example 1 is subjected to microwave dielectric property test by using a microwave network analyzer, and the performance test result is shown in table one.
Example 2
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 2 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.05SmAlO3-0.35CaSmAlTiO6The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1500 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in the example 2 is subjected to microwave dielectric property test by using a microwave network analyzer, and the performance test result is shown in table one.
Example 3
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 3 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.1SmAlO3-0.3CaSmAlTiO6The materials are mixed according to the mole ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1480 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in the example 3 is subjected to microwave dielectric property test by using a microwave network analyzer, and the performance test result is shown in table one.
Example 4
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 4 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.15SmAlO3-0.25CaSmAlTiO6The materials are mixed according to the mole ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1480 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in the example 4 is subjected to microwave dielectric property test by using a microwave network analyzer, and the performance test result is shown in table one.
Example 5
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 5 includes the following steps:
(1) firstly TiO is added2And CaCO3According toChemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.2SmAlO3-0.2CaSmAlTiO6The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1450 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in example 5 was subjected to microwave dielectric property test using a microwave network analyzer, and the results of the property test are shown in table one.
Example 6
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 6 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Fully mixing the mixtureGrinding, ball milling, drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.25SmAlO3-0.15CaSmAlTiO6The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1450 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in example 6 was subjected to a microwave dielectric property test using a microwave network analyzer, and the performance test results are shown in table one.
Example 7
The preparation method of the low-loss high-strength microwave dielectric ceramic in this embodiment 7 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3Combination ofAn agent;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.3SmAlO3-0.1CaSmAlTiO6The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1400 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in example 7 was subjected to a microwave dielectric property test using a microwave network analyzer, and the results of the property test are shown in table one.
Example 8
The preparation method of the low-loss high-strength microwave dielectric ceramic according to embodiment 8 includes the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3According to chemical formulaSmAlO3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaSmAlTiO6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the chemical formula 0.6CaTiO3-0.35SmAlO3-0.05CaSmAlTiO6The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1400 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
The microwave dielectric ceramic obtained in example 8 was subjected to microwave dielectric property test using a microwave network analyzer, and the results of the property test are shown in table one.
Comparative example
The preparation method of the microwave dielectric ceramic of the comparative example comprises the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, oven drying, sieving, placing into corundum crucible, and calcining at 1100 deg.C for 4 hr to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3After the mixture is fully ball-milled,ball-milling, drying, sieving, placing into a corundum crucible, and roasting at 1100 deg.C for 4 hr to obtain SmAlO3A composition;
(3 the CaTiO thus obtained3Composition, SmAlO3The composition is according to the chemical formula 0.6CaTiO3-0.4SmAlO3The materials are mixed according to the molar ratio, fully ball-milled after mixing, dried, granulated and sieved after ball-milling, the sieved particles are pressed and molded, and then sintered for 4 hours at 1400 ℃ to obtain the low-loss high-strength microwave dielectric ceramic.
And (3) testing the microwave dielectric property of the microwave dielectric ceramic obtained in the comparative example by using a microwave network analyzer, wherein the performance test result is shown in the table I.
TABLE A result of a performance test of the microwave dielectric ceramics obtained in examples 1 to 8 and comparative example
As can be seen from Table 1, the microwave dielectric ceramics obtained in the embodiments 1 to 8 of the present invention have a relative dielectric constant of 33 to 38, a microwave performance Qf of 44000-.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A low-loss high-strength microwave dielectric ceramic is characterized in that: the composition expression is xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Wherein x, y and (1-x-y) all represent molar ratios, x is 0.6, and y is more than or equal to 0 and less than 0.4.
2. The low loss high strength microwave dielectric ceramic of claim 1 wherein: in the composition expression of the microwave dielectric ceramic, y is more than or equal to 0 and less than 0.35.
3. A preparation method of a low-loss high-strength microwave dielectric ceramic is characterized by comprising the following steps:
(1) firstly TiO is added2And CaCO3According to the chemical formula CaTiO3Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2And CaCO3Mixing, ball milling, stoving, sieving, roasting in corundum crucible to obtain CaTiO3A composition;
(2) mixing Sm2O3And Al2O3SmAlO according to the chemical formula3Mixing Sm with the corresponding elements in the proportion by mol2O3And Al2O3Mixing, ball milling, oven drying, sieving, calcining in corundum crucible to obtain SmAlO3A composition;
(3) adding TiO into the mixture2、CaCO3、Sm2O3、Al2O3According to the chemical formula CaSmAlTiO6Mixing the corresponding elements in the mixture according to the molar ratio of the TiO2、CaCO3、Sm2O3、Al2O3Mixing, ball milling, stoving, sieving, roasting in corundum crucible to obtain CaSmAlTiO powder6The composition of (1);
(4) the obtained CaTiO3Composition, SmAlO3Composition and CaSmAlTiO6The composition is according to the formula xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Mixing the materials according to the molar ratio, fully ball-milling after mixing, drying, granulating, sieving, pressing and molding the sieved particles, and then sintering to obtain the low-loss high-strength microwave dielectric ceramic, wherein the chemical formula is xCaTiO3-ySmAlO3-(1-x-y)CaSmAlTiO6Wherein x, y and (1-x-y) all represent molar ratios, x is 0.6, and y is not less than 0 and is less than 0.4.
4. The method for preparing microwave dielectric ceramic with low loss and high strength as claimed in claim 3, wherein the roasting process in step (1) is roasting and heat preservation at 1000-1100 ℃ for 3-5 h.
5. The method for preparing microwave dielectric ceramic with low loss and high strength as claimed in claim 3, wherein the roasting process in step (2) is roasting and heat preservation at 1000-1100 ℃ for 3-5 h.
6. The method for preparing microwave dielectric ceramic with low loss and high strength as claimed in claim 3, wherein the roasting process in step (3) is roasting and heat preservation at 1000-1100 ℃ for 3-5 h.
7. The method for preparing microwave dielectric ceramic with low loss and high strength as claimed in claim 3, wherein in step (4), the sieved particles are pressed into cylinders with diameter of 10mm and height of 6 mm.
8. The method for preparing microwave dielectric ceramic with low loss and high strength as claimed in claim 3, wherein the sintering process in step (4) is sintering at 1400-1500 ℃ for 4 hours.
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