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Microwave dielectric ceramic and preparation method thereof

A technology of microwave dielectric ceramics and preparation steps, which is applied in the field of ultra-low temperature sintered microwave dielectric ceramics and its preparation, and can solve problems such as high sintering temperature, high absolute value of the temperature coefficient of resonance frequency, and inability to co-fire low-melting point electrode materials.

Active Publication Date: 2013-06-19
南京攀思特电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above studies have shown that Zn 3 Nb 2 o 8 -ZnNb 2 o 6 The microwave dielectric properties of the system are good, but the absolute value of the resonant frequency temperature coefficient is very high, and the sintering temperature is also high, so it cannot be co-fired with low melting point electrode materials, which limits the application of the material

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  • Microwave dielectric ceramic and preparation method thereof
  • Microwave dielectric ceramic and preparation method thereof

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Embodiment 1

[0018] This embodiment is a microwave dielectric ceramic. The microwave dielectric ceramic is based on analytically pure ZnNb 2 o 6 , 99.9% ZnO and Nb 2 o 5 and TiO with a purity of 99.8% and 99.9% respectively 2 and TeO 2 As the starting material, according to (1-x)(0.7ZnNb 2 o 6 -0.3Zn 3 Nb 2 o 8 )-xTiTe 3 o 8 (where x = 0.3) stoichiometric formulation.

[0019] This embodiment also proposes a method for preparing the microwave dielectric ceramic, and its specific preparation steps are:

[0020] Step 1, prepare Zn 3 Nb 2 o 8 Burnt powder. ZnO and Nb 2 o 5 , Weighed in a molar ratio of 3:1. The weighed ZnO powder and Nb 2 o 5 The powder is placed in a polyethylene ball mill jar. Add absolute ethanol according to the mass ratio of powder and ethanol in the range of 1:1 to 2:1, and ball mill on a ball mill for 12 hours. The ball-milled wet material was placed in an oven, and dried at 100° C. for 6 hours to obtain a dry powder. Grind the dry powder into a...

Embodiment 2

[0028] This embodiment is a microwave dielectric ceramic. The microwave dielectric ceramic is based on analytically pure ZnNb 2 o 6 , 99.9% ZnO and Nb 2 o 5 and TiO with a purity of 99.8% and 99.9% respectively 2 and TeO 2 As the starting material, according to (1-x)(0.7ZnNb 2 o 6 -0.3Zn 3 Nb 2 o 8 )-xTiTe 3 o 8 (where x = 0.4) stoichiometric formulation.

[0029] This embodiment also proposes a method for preparing the microwave dielectric ceramic, and its specific preparation steps are:

[0030] Step 1, prepare Zn 3 Nb 2 o 8 Burnt powder. ZnO and Nb 2 o 5 , Weighed in a molar ratio of 3:1. The weighed ZnO and Nb 2 o 5Put it in a polyethylene ball mill jar, add absolute ethanol according to the mass ratio of powder to ethanol in the range of 1:1 to 2:1, and mill on a ball mill for 16 hours. The ball-milled wet material was placed in an oven, and dried at 80° C. for 8 hours to obtain a dry powder. Grind the dry powder into a powder in an agate mortar. T...

Embodiment 3

[0038] This embodiment is a microwave dielectric ceramic. The microwave dielectric ceramic is based on analytically pure ZnNb 2 o 6 , 99.9% ZnO and Nb 2 o 5 and TiO with a purity of 99.8% and 99.9% respectively 2 and TeO 2 As the starting material, according to (1-x)(0.7ZnNb 2 o 6 -0.3Zn 3 Nb 2 o 8 )-x(TiO 2 -3TeO 2 ) (wherein x=0.3) stoichiometric dosage ratio batching.

[0039] This embodiment also proposes a method for preparing the microwave dielectric ceramic, and its specific preparation steps are:

[0040] Step 1, prepare Zn 3 Nb 2 o 8 Burnt powder. ZnO and Nb 2 o 5 , Weighed in a molar ratio of 3:1. The weighed ZnO and Nb 2 o 5 Put it in a polyethylene ball mill jar, add absolute ethanol according to the mass ratio of powder to ethanol in the range of 1:1 to 2:1, and mill on a ball mill for 20 hours. The ball-milled wet material was placed in an oven, and dried at 60°C for 10 hours to obtain a dry powder. Grind the dry powder into a powder in an ...

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Abstract

The invention relates to ultralow-temperature sintering microwave dielectric ceramic with a near-zero temperature coefficient of resonant frequency. A method for preparing the ultralow-temperature sintering microwave dielectric ceramic comprises the following steps of: preparing Zn3Nb2O8 presintering powder by analytically pure ZnO and Nb2O5, and preparing TiTe3O8 presintering powder by analytically pure TiO2 and TeO2; and adding 0.3 to 0.5 mol of TiO2 and TeO2 oxides or TiTe3O8 compound into 0.7ZnNb2O6-0.3Zn3Nb2O8 serving as a matrix material by two different processes respectively, ball-milling, drying, adding 5 to 10 weight percent of polyvinyl acetate (PVA), granulating, compressing for forming, and sintering at the temperature of between 650 and 700 DEG C to obtain the ceramic material of which the temperature coefficient of resonant frequency is close to zero and which is high in microwave dielectric property. The low-temperature sintering performance of the microwave dielectricceramic is improved greatly, the defect of a large temperature coefficient of resonant frequency of the ceramic is overcome, the temperature stability of the material is ensured, the cost is reduced,and the requirement of a low temperature co-fired ceramics (LTCC) process is met, so the ultralow-temperature sintering microwave dielectric ceramic has a great significance for the miniaturization, light weight, integration and the like of microwave components.

Description

technical field [0001] The invention relates to the technical field of microwave dielectric ceramic materials, in particular to an ultra-low temperature sintered microwave dielectric ceramic with a near-zero resonance frequency temperature coefficient and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used in microwave frequency bands, mainly UHF and SHF frequency bands, as dielectric materials and to complete one or more functions. They are resonators, filters, and dielectric substrates widely used in the modern communication field Key materials for microwave components such as chips and dielectric waveguide circuits. [0003] With the continuous development of modern communication technology, mobile communication equipment and portable terminals are tending towards miniaturization, portability, multi-function, high reliability and low cost, which requires microwave dielectric ceramics to have the followi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/64
Inventor 高峰曹宵胡国辛许贝刘亮亮李志强
Owner 南京攀思特电子科技有限公司
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