Microwave dielectric ceramic La7Nb3Mo4O30 capable of being sintered at low temperature and preparation method thereof
A technology of microwave dielectric ceramics and low-temperature sintering, which is applied in the field of dielectric ceramic materials, can solve the problems of limited and limited low-temperature co-firing technology and the development of microwave multilayer devices, and achieve the effect of small resonant frequency temperature coefficient and large application value
Active Publication Date: 2015-06-10
苏州弘吴科技中介服务有限公司
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Problems solved by technology
At present, the high-performance microwave dielectric ceramic system that can be fired at low temperature is still very limited, which largely limits the development of low-temperature co-firing technology and microwave multilayer devices.
Method used
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[0018] Table 1 shows four specific examples of different sintering temperatures and their microwave dielectric properties of the present invention. The preparation method is as described above, and the microwave dielectric properties are evaluated by the cylindrical dielectric resonator method. The present invention is by no means limited to the above embodiments. The upper and lower limits and interval values of the sintering temperature can realize the present invention, and the embodiments are not listed here.
[0019] This ceramic can be widely used in the manufacture of microwave devices such as various dielectric substrates, resonators and filters, and can meet the technical needs of mobile communications, satellite communications and other systems.
[0020] Table 1:
[0021]
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Abstract
The invention discloses a microwave dielectric ceramic La7Nb3Mo4O30 capable of being sintered at low temperature and a preparation method thereof. The chemical formula of the microwave dielectric ceramic capable of being sintered at low temperature is La7Nb3Mo4O30. The preparation method provided by the invention comprises the following steps: (1) weighing original powders of La2O3, Nb2O5 and MoO3, with the purity of over 99.9%, according to the chemical formula of La7Nb3Mo4O30; (2) mixing the raw materials in the step (1) and carrying out wet ball-milling for 12 hours by the use of distilled water used as a solvent, drying, and presintering in atmosphere at 900 DEG C for 6 hours; and (3) adding a binder into the powder prepared in the step (2) and granulating, carrying out compression moulding, and finally sintering in atmosphere at 950-980 DEG C for 4 hours. A polyvinyl alcohol solution at the mass concentration of 5% is used as the binder, and the binder accounts for 3% of the total weight of the powder. The ceramic prepared by the above method can be sintered well at 950-980 DEG C, and its dielectric constant reaches 21-22 and quality factor Qf reaches up to 86000-102000GHz. Temperature coefficient of resonance frequency is low. The ceramic has great application value in the industry.
Description
Technical field [0001] The invention relates to a dielectric ceramic material, in particular to a microwave dielectric ceramic material for microwave components such as dielectric substrates, resonators and filters used at microwave frequencies and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials and perform one or more functions in circuits in the microwave frequency band (mainly UHF and SHF frequency bands). They are widely used as resonators, filters, and dielectric bases in modern communications. Chips and dielectric guided wave 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. The process of miniaturization and integration is playing an increasingly important role. [0003] The dielectric ceramic...
Claims
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IPC IPC(8): C04B35/50C04B35/622
Inventor 方亮蒋雪雯郭欢欢
Owner 苏州弘吴科技中介服务有限公司