Low temperature sintered microwave dielectric ceramic Bi3Ca9V11O41 and preparation method thereof
A microwave dielectric ceramic and low-temperature sintering technology, applied in the field of dielectric ceramic materials, can solve problems such as large loss of ceramics, and achieve the effect of small temperature coefficient of resonant frequency and large application value
Active Publication Date: 2014-01-08
苏州弘吴科技中介服务有限公司
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Problems solved by technology
Our pair becomes Bi 3 Ca 9 V 11 o 41 、 Bi 3 Ba 9 V 11 o 41 and Bi 3 Sr 9 V 11 o 41 The sintering characteristics and microwave dielectric properties of vanadate ceramics were studied, and it was found that Bi 3 Ba 9 V 11 o 41 and Bi 3 Sr 9 V 11 o 4 Ceramic loss is too large to be applied in the microwave frequency band, but Bi 3 Ca 9 V 11 o 41 Ceramics have excellent comprehensive microwave dielectric properties and the sintering temperature is lower than 880 ° C, can be widely used in the manufacture of microwave devices such as various resonators and filters, and can meet the needs of low-temperature co-firing technology and microwave multilayer devices
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[0019] Table 1 shows four specific examples of different sintering temperatures constituting the present invention and their microwave dielectric properties. The preparation method is as above, and the microwave dielectric performance is evaluated by the cylindrical dielectric resonator method. Bi 3 Ca 9 V 11 o 41 The powder was mixed with Ag powder accounting for 20% of the mass of the powder, pressed and molded, and then sintered at 880 °C for 4 hours; X-ray diffraction phase analysis and scanning electron microscope observation showed that Bi 3 Ca 9 V 11 o 41 There is no chemical reaction with Ag, that is, Bi 3 Ca 9 V 11 o 41 It can be co-fired with Ag electrodes at low temperature.
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Abstract
The invention discloses a low temperature sintered microwave dielectric ceramic Bi3Ca9V11O41 and a preparation method thereof. The chemical formula of the low temperature sintered microwave dielectric ceramic is Bi3Ca9V11O41. The preparation method comprises the following steps: (1) weighing and mixing original powder, with purity above 99.9%, of Bi2O3, CaCO3 and V2O5 according to the chemical formula Bi3Ca9V11O41; (2) carrying out wet ball milling on the raw material mixture obtained in the step (1) for 12 hours and presintering the powder in an atmosphere at 800 DEG C for 6 hours after drying the powder, wherein the solvent is distilled water; (3) adding a binder to the powder prepared in the step (2) and then granulating the mixture, then carrying out compression forming and finally sintering the product in an atmosphere at 850-880 DEG C for 4 hours, wherein a polyvinyl alcohol solution with mass concentration of 5% is adopted as the binder and the dosage of the binder is 3% of the total mass of the powder. The prepared ceramic is well sintered at 850-880 DEG C, has dielectric constant of 15-16 and quality factor (Qf) as high as 76000-91000GHz, has low temperature coefficient of resonance frequency, can be co-sintered with Ag electrodes at low temperature and has great application value in industry.
Description
technical field [0001] The invention relates to a dielectric ceramic material, in particular to a microwave dielectric ceramic material for microwave components used at microwave frequencies, such as a dielectric substrate, a resonator, and a filter, 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. ...
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IPC IPC(8): C04B35/495C04B35/622
Inventor 方亮蒋雪雯郭欢欢
Owner 苏州弘吴科技中介服务有限公司