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Microwave dielectric ceramic Li3Nb3B2O12 sintered at ultralow temperature and preparation method thereof

A technology of microwave dielectric ceramics and ultra-low temperature, applied in the field of dielectric ceramics, can solve the problems of application limitations, toxicity, etc., and achieve the effect of large application value and small temperature coefficient of resonance frequency

Active Publication Date: 2014-06-25
苏州弘吴科技中介服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Because compounds containing Bi, Te, Mo, etc. are easy to react with the Ag electrode at the interface and the raw material TeO 2 Toxicity limits the application of these Bi, Te, Mo-based materials

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  • Microwave dielectric ceramic Li3Nb3B2O12 sintered at ultralow temperature and preparation method thereof

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Embodiment

[0019] Table 1 shows four specific examples of different sintering temperatures constituting the present invention and their microwave dielectric properties. Its preparation method is as described above, carries out the evaluation of microwave dielectric property with cylindrical dielectric resonator method; Li 3 Nb 3 B 2 o 12 The powder was mixed with Ag powder accounting for 20% of the powder mass, pressed and molded, and then sintered at 680 °C for 4 hours; X-ray diffraction phase analysis and scanning electron microscope observation showed that Li 3 Nb 3 B 2 o 12 There is no chemical reaction with Ag, that is, Li 3 Nb 3 B 2 o 12It can be co-fired with Ag electrodes at low temperature.

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Abstract

The invention discloses a microwave dielectric ceramic Li3Nb3B2O12 sintered at an ultralow temperature and a preparation method thereof. The chemical constitution of the microwave dielectric ceramic sintered at an ultralow temperature is Li3Nb3B2O12. The preparation method includes the following steps: (1) weighing and matching original powder of pure Li2CO3, Nb2O5 and B2O3 according to the chemical formula of Li3Nb3B2O12; (2) adding distilled water in the raw materials in the step (1), performing mixed wet ball milling for 12 hours, and pre-sintering for 6 hours in an atmosphere of 600 DEG C after drying; and (3) adding an adhesive in the powder prepared in the step (2) and pelleting, press forming, and finally sintering the powder for 4 hours in an atmosphere of 650-680 DEG C, wherein the adhesive is a polyvinyl alcohol solution with mass concentration of 5%, and the adhesive accounts for 3% of the total mass of the powder. The ceramic prepared by the preparation method provided by the invention has good sintering property at 650-680 DEG C, the dielectric constant of the ceramic reaches 9-10, the quality factor Qf value is up to 110000-138000GHz, the temperature coefficient of resonant frequency is small, the ceramic can be sintered together with Ag at a low temperature and has a large application value in industry.

Description

technical field [0001] The present invention relates to dielectric ceramics, in particular to microwave dielectric ceramics for microwave components used at microwave frequencies, such as dielectric substrates, resonators and filters, and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important role in the process of miniaturization and integration. [0003] Dielect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 方亮郭欢欢唐莹
Owner 苏州弘吴科技中介服务有限公司
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