A medium dielectric constant ceramic for dielectric resonator and preparation method thereof
A dielectric resonator and electric constant technology, applied in resonators, ceramics, circuits, etc., can solve the problems of high quality factor, low sintering temperature, and near-zero temperature coefficient of resonant frequency, achieving high quality factor and simple preparation process. , the effect of high Q value
Active Publication Date: 2022-07-22
GUANGDONG KANGRONG HIGH TECH NEW MATERIAL CO LTD
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Problems solved by technology
The intermediate dielectric constant ceramics in the prior art have Al 2 o 3 system, MgTiO 3 -CaTiO 3 System, AB 2 o 6 system, etc., under the mutual constraints of the three main factors of dielectric constant, quality factor, and resonance frequency temperature coefficient, it is difficult for the existing medium dielectric constant ceramics to simultaneously achieve adjustable dielectric constant, high quality factor, and resonance frequency temperature coefficient. Near zero, low firing temperature
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[0058] The preparation method of the intermediate dielectric constant of the present embodiment comprises the following steps:
[0059] (1) Use B 2 O 3 , SiO 2 , Al 2 O 3 , CaO and Li 2 O is a raw material, after fully mixing, calcining at a high temperature at 4°C / min to 1350-1450°C to form a molten liquid, and quenching the molten liquid with cold water to obtain the glass composite with a particle size of 1-8 mm ;
[0060] (2) Weigh ZnO and V according to the stoichiometric ratio of 3:1 2 O 5 , deionized water is used as a medium for wet ball milling to obtain a slurry. After drying, the slurry is placed in a high-temperature furnace and heated to 900 °C at 4 °C / min for 5-7 hours to obtain a low melting point oxide ZnO-V 2 O 5 ;
[0061] (3) In moles, will (1-x) CaCO 3 , (1-x) parts of TiO 2 , x / 2 copies of Sm 2 O 3 , x / 2 parts of Al 2 O 3 , y / 100 parts of low melting point oxide ZnO-V 2 O 5 A mixture is obtained by mixing, by weight, 90-110 parts of the i...
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Abstract
The invention relates to the technical field of electronic ceramics. The invention discloses a medium dielectric constant ceramic used for a dielectric resonator and a preparation method thereof. The chemical expression of the medium dielectric constant ceramic is: (1-x) CaTiO 3 ‑xSmAlO 3 ‑z% (SiO 2 ‑B 2 O 3 ‑CaO‑Al 2 O 3 ‑Li 2 O)‑y% (ZnO‑V 2 O 5 ), where x=0.25~0.5, z=1~2, y=0.5~1.1. The method comprises the steps of: preparing a glass composite and a low melting point oxide ZnO‑V by calcination 2 O 5 ; the CaCO 3 , TiO 2 , Sm 2 O 3 , Al 2 O 3 , low melting point oxide ZnO‑V 2 O 5 , making synthetic powder by calcination; slurrying and granulating the synthetic powder and glass composite; green body sintering to obtain the medium dielectric constant ceramic, and the sintering temperature is 1330-1350°C. The medium dielectric constant ceramic of the present invention contains two main crystal phases (CaTiO 3 and SmAlO 3 ), which has the advantages of adjustable dielectric constant, high quality factor, and near-zero temperature coefficient of resonant frequency. The preparation process is relatively simple, it is easy to realize large-scale continuous production, and automatic production can be realized.
Description
technical field [0001] The invention relates to the technical field of electronic ceramics, in particular to a medium dielectric constant ceramic used for a dielectric resonator and a preparation method. Background technique [0002] Microwave dielectric ceramics are a class of ceramics that are used in the microwave frequency band (300MHz to 300GHz) and play a series of circuit functions such as dielectric isolation, dielectric waveguide and dielectric resonance in circuit systems. Resonators, filters, antennas, duplexers and other frequency devices made of microwave dielectric ceramics can be widely used in wireless communications, satellite signal reception, various radar systems, global satellite signal navigation systems and many other fields. [0003] The trend of device miniaturization makes people more inclined to use medium dielectric constant ceramics for dielectric resonators. Intermediate dielectric constant ceramics usually refer to dielectric ceramic materials...
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IPC IPC(8): C04B35/465C04B35/622H01B3/12H01P7/10
CPCC04B35/465C04B35/622H01B3/12H01P7/10C04B2235/3222C04B2235/608C04B2235/3418C04B2235/3409C04B2235/3208C04B2235/3217C04B2235/3203C04B2235/3284C04B2235/3239C04B2235/36C04B2235/442C04B2235/3224C04B2235/6562C04B2235/6567C04B2235/96
Inventor 林小冬谢义鹏薛伟志符仁敏
Owner GUANGDONG KANGRONG HIGH TECH NEW MATERIAL CO LTD