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A low-temperature sintered composite microwave dielectric ceramic material and its preparation method

A technology of microwave dielectric ceramics and low-temperature sintering, which is applied in the field of dielectric ceramics, which can solve the problems of high slurry viscosity, increased material dielectric loss, and inability to co-fire, and achieve high quality factor Qf, lower sintering temperature, and small temperature coefficient of resonance frequency Effect

Inactive Publication Date: 2014-10-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the sintering temperature of undoped LNT ceramics is relatively high (1150°C), and it cannot be directly co-fired with low melting point metals such as Ag and Cu.
In order to reduce the sintering temperature, one of the traditional methods is to add low melting point oxides, such as B 2 o 3 and V 2 o 5 , while the free B 2 o 3 and V 2 o 5 In the late casting process, the viscosity of the slurry is too high and unstable, which limits its practical application; another method is to add low-melting glass, but the existence of the glass phase greatly increases the dielectric loss of the material, and the glass is in Unstable performance and high cost during the smelting process greatly limit the development of LNT materials and microwave multilayer devices

Method used

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  • A low-temperature sintered composite microwave dielectric ceramic material and its preparation method
  • A low-temperature sintered composite microwave dielectric ceramic material and its preparation method
  • A low-temperature sintered composite microwave dielectric ceramic material and its preparation method

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Embodiment

[0028] The material of the present invention consists of Li 2 O-Nb 2 o 5 -TiO 2 It is composed of a series material and a composite fever reducer accounting for 1-10% by weight of the main crystal phase, and the material of the invention can be obtained through solid-state reaction. Li 2 O-Nb 2 o 5 -TiO 2 The composition of the system material is Li a Nb b Ti c o 3 Among them: a=2.081, b=0.243, c=0.676. The raw materials for the manufacture of composite fever reducers include: lithium carbonate (Li 2 CO 3 ), zinc oxide (ZnO), aluminum oxide (Al 2 o 3 ), calcium oxide (CaO), silicon dioxide (SiO 2 ), boron trioxide (B 2 o 3 ) and trace additive components. Table 1 shows the data of several specific examples of the composition content of the present invention, and Table 2 shows the microwave dielectric properties of each example. The preparation method is as above, and the microwave dielectric performance is evaluated by the cylindrical dielectric resonator me...

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Abstract

The invention discloses a low-temperature sintered microwave dielectric ceramic material with medium dielectric constant and high quality factor and a preparation method thereof. The material is composed of Li2O-Nb2O5-TiO2 series material and a composite fever reducer accounting for 1-10% by weight of the main crystal phase, and the material of the invention can be obtained through solid state reaction. The composition of Li2O-Nb2O5-TiO2 series material is LiaNbbTicO3, in which: 2

Description

technical field [0001] The invention belongs to the field of dielectric ceramics, in particular to composite microwave dielectric ceramic materials. 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. Chips, dielectric waveguide circuits and other components are the key basic materials of modern communication technology. They have very important applications in portable mobile phones, TV satellite receivers, and military radars. In the process of miniaturization and integration of modern communication tools Zhongzheng is playing an increasingly important role. [0003] Dielectric ceramics used in the microwave frequency band should meet the requirements: (1) appropriate dielectric constant to facilitate the mini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 李恩竹余韶阳周晓华钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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