A temperature-stable ultra-low dielectric constant microwave dielectric ceramic and its preparation method
A technology of microwave dielectric ceramics and ultra-low dielectric constant, applied in the field of dielectric ceramic materials, can solve the problems of microwave dielectric ceramics, large dielectric loss, and inability to be used as microwave dielectric ceramics, etc., to meet the requirements of low-temperature co-firing technology, The effect of small temperature coefficient and large application value
Active Publication Date: 2016-01-13
江苏开创检测技术有限公司
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Problems solved by technology
LiFe 3 B 4 o 11 Ceramic resonant frequency temperature coefficient τ ? Too large (respectively +64ppm / ℃) and cannot be used as a practical microwave dielectric ceramic; while LiGa 3 B 4 o 11 with LiBi 3 B 4 o 11 As a semiconductor, its dielectric loss is too large to be used as a microwave dielectric ceramic
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[0018] Table 1 shows three 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.
[0019] The ceramics 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 communication and satellite communication systems.
[0020] Table 1:
[0021]
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Abstract
The invention discloses temperature-stable microwave dielectric ceramics LiAl3B4O11 with ultralow dielectric constant and a preparation method thereof. The preparation method comprises the steps: (1) weighing and dosing the raw material powder of Li2CO3, Al2O3 and H3BO3 with purity of more than 99.9% (weight percentage) according to the composition of the LiAl3B4O11; (2) ball-milling and mixing the raw materials in the step (1) for 12 hours in a wet method, utilizing absolute ethyl alcohol as the ball-milling medium, drying and then pre-burning for 6 hours in the air atmosphere of 700 degrees centigrade; (3) adding an adhesive to the powder prepared in the step (2), granulating, pressing and molding, and finally burning for 4 hours in the air atmosphere of 820 degrees centigrade, wherein the mass concentration of the adhesive is polyving akohol solution of 5% and the dosage of the polyving akohol accounts for 4% that of the total mass of the poweder. The prepared ceramics are sintered well and the dielectric constant is up to 7.3-7.8; the quality factor Qf value is up to 142,000-181,000GHz; the temperature coefficient of resonance frequency is small and the ceramics have great application value in industry.
Description
technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric ceramic material for manufacturing microwave components such as ceramic substrates, resonators and filters used in microwave frequencies 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. [00...
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IPC IPC(8): C04B35/01C04B35/10C04B35/622
Inventor 陈进武唐莹苏和平
Owner 江苏开创检测技术有限公司
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