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Microwave medium ceramic and preparing method thereof

A technology of microwave dielectric ceramics and ball milling method, which is applied to ceramics, inorganic insulators, etc., can solve the problems of high frequency, miniaturization and application range expansion of microwave devices, and achieve the effect of low loss

Inactive Publication Date: 2004-09-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

These greatly limit the further high frequency, miniaturization and expansion of application range of microwave devices.

Method used

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Examples

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Embodiment Construction

[0016] Table 1 shows several specific examples of the content of each component constituting the present invention and its microwave dielectric properties. The preparation method is as described above, and the raw material used therein has a purity of more than 99.9%. The microwave dielectric properties (ie dielectric constant ε, dielectric loss characteristic Qf value, resonant frequency temperature coefficient τf) were evaluated by the cylindrical dielectric resonator method.

[0017] Sample No. 1-4 were prepared as follows:

[0018] 1. Make CaC0 with a purity of more than 99.9% 3 , Nd 2 O 3 , MgCO 3 , TiO 2 According to the above m(aCaO.bNd 2 O 3 ).cMgO.TiO 2 The proportion of the powder is mixed evenly by ball milling method, the solvent is deionized water, after drying, it is pre-fired at 1050 ° C in the atmosphere for 4 hours, then mixed evenly by ball milling method, and then dried.

[0019] 2. Use Li with a purity of more than 99.9% 2 CO 3 , Sm 2 O 3 , TiO...

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Abstract

The invention disclose a microwave medium ceramic, including main component: p[m(aCaO.bNd2O3) .cMgO.TiO2].q[1 / 4Li2O.1 / 4Sm2O3.TiO2], where according to mol percent, p+q=100mol%, m+c=1, a+3b=1, q is not less than 30 mol% and not greater than 55 mol%, a not less than 0.3 mol and not greater than 0.75 mol, and m not less than 0.8 mol and not greater than 0.95 mol; auxiliary component ZnO, 0.5-20wt% of the main component. It also provides preparing method. Its dielectric constant is 90-120, and it has low-loss and adjustable harmonic frequency temperature coefficient, and can make microwave devices such as medium resonator and filter adaptive to higher frequency. It can be applied to high frequency ceramic capacitor or temperature compensating capacitor, and so on.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, in particular to a microwave dielectric ceramic and a preparation method thereof. The microwave dielectric ceramic can be used for microwave components such as dielectric resonators and filters in communication systems. Background technique [0002] In recent years, with the rapid development of mobile communication and satellite communication technology, the demand for microwave dielectric ceramics for microwave components such as dielectric resonators and filters is increasing. [0003] For high-performance microwave dielectric ceramics, it is first required to have low dielectric loss (high Q value, at the corresponding application frequency, Q>3000) and a temperature coefficient of resonant frequency close to zero (-20ppm / ℃<τ f <20ppm / ℃, for material series with lower dielectric constant, -10ppm / ℃<τ f <10ppm / ℃), at the same time, in order to meet the nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/465C04B35/622C04B35/64H01B3/12
Inventor 周东祥龚树萍黄国华徐建梅梁飞
Owner HUAZHONG UNIV OF SCI & TECH
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