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Low temperature sintering lithium-based microwave dielectric ceramics and preparation method thereof

A technology of dielectric ceramics and binders, which is applied in the field of low-temperature sintered lithium-based microwave dielectric ceramics and its preparation, can solve the problems of high frequency, high reliability, miniaturization, and incompatibility. Burning into multilayer ceramic capacitors and other issues

Active Publication Date: 2012-09-26
连云港市邦本科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] With the accelerated development of information technology, mobile communication systems are developing in the direction of high frequency, miniaturization, integration, and high reliability. The dielectric constant of the medium dielectric constant material system is low, and it is very easy to maintain the Q value without reducing the dielectric constant. It is difficult to meet the needs of further miniaturization
The high dielectric constant material system mainly has poor comprehensive performance and small Q f value, which makes it difficult to meet the development needs of high frequency and high reliability.
In addition, the sintering temperature of these material systems is generally higher than 1300 ° C, and cannot be directly co-fired with low melting point metals such as Ag and Cu to form multilayer ceramic capacitors.

Method used

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  • Low temperature sintering lithium-based microwave dielectric ceramics and preparation method thereof
  • Low temperature sintering lithium-based microwave dielectric ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical composition formula of the dielectric ceramic material is: Li 2 CoTi 3 o 8 .

[0018] Li with a purity of more than 99.9% 2 CO 3 、Co 2 o 3 、TiO 2 , SnO 2 and ZrO 2 The raw powder of Li 2 CoTi 3 o 8 Chemical formula weighing ingredients; wet ball milling and mixing for 12 hours, the solvent is distilled water, after drying, it is pre-fired in the atmosphere at 900°C for 4 hours, and then the pre-fired powder is added with a binder and granulated, and then pressed into shape. Sintering in an air atmosphere at 950° C. for 1 hour; the binder uses a polyvinyl alcohol solution with a mass concentration of 5%, and the dosage accounts for 3% of the total amount of the original powder.

Embodiment 2

[0020] The chemical composition formula of the dielectric ceramic material is: Li 2 CoTiZrSnO 8 .

[0021] Li with a purity of more than 99.9% 2 CO 3 、Co 2 o 3 、TiO 2 , SnO 2 and ZrO 2 The raw powder of Li 2 CoTiZrSnO 8 Chemical formula weighing ingredients; wet ball milling and mixing for 15 hours, the solvent is distilled water, after drying, it is pre-fired in the atmosphere at 900°C for 5 hours, and then the pre-fired powder is added with a binder and granulated, and then pressed into shape, and finally in Sintering in the air atmosphere at 1000°C for 2 hours; the binder is a polyvinyl alcohol solution with a mass concentration of 5%, and the dosage accounts for 5% of the total amount of the original powder.

Embodiment 3

[0023] The chemical composition formula of the dielectric ceramic material is: Li 2 CoZrSn 2 o 8 .

[0024] Li with a purity of more than 99.9% 2 CO 3 、Co 2 o 3 、TiO 2 , SnO 2 and ZrO 2 The raw powder of Li 2 CoZrSn 2 o 8 Chemical formula weighing ingredients; wet ball milling and mixing for 20 hours, the solvent is distilled water, after drying, it is pre-fired in the atmosphere at 900 ° C for 6 hours, and then the pre-fired powder is added with a binder and granulated, then pressed into shape, and finally in Sintering in the air atmosphere at 1080° C. for 2 hours; the binder uses a polyvinyl alcohol solution with a mass concentration of 5%, and the dosage accounts for 12% of the total amount of the original powder.

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Abstract

The invention discloses low temperature sintering lithium-based microwave dielectric ceramics and a preparation method thereof. A chemical composition formula of the dielectric ceramics is Li2CoTi3-x-yZrxSnyO8, wherein x is no less than 0.00 and no more than 1, and y is no less than 0.00 and no more than 2. The preparation method comprises the following steps of weighing and proportioning original powder of Li2CO3, Co2O3, TiO2, XnO2 and ZrO2 with the purity above 99.9 percent based on the chemical formula of Li2CoTi3-x-yZrxSnyO, wherein x is no less than 0.00 and no more than 1, and y is no less than 0.00 and no more than 2; and wet type ball milling and mixing for 12-24h, using distilled water as a solvent, preburning for 4-8h in the air atmosphere of 90 DEG C after drying, adding binderin preburning powder, pressing and forming after granulation, and sintering for 1-3h in the air atmosphere of 950-1100 DEG C. Polyvinyl alcohol solvent with the mass concentration of 5 percent is adopted as the binder, and the dosage of the binder accounts for 3-15 percent of the total quantity of the original powder. The sintering temperature of ceramic materials is lower than 1100 DEG C, the high frequency dielectric constant reaches 25-40, a Q*f value reaches 24000-53000GHz, and the resonant frequency temperature coefficiency (tau f) is small and favorable.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a low-temperature sintered lithium-based microwave dielectric ceramic and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency band (mainly UHF, SHF frequency band) circuits 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 been used in portable mobile phones, car phones, cordless phones, TV satellite receivers, military radars, etc. It is playing an increasingly important role in the process of miniaturization and integration. [0003] Dielectric ceramics used in the microwave frequency band should meet the following requirements for dielectric properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/01C04B35/46C04B35/457C04B35/48C04B35/622
Inventor 方亮褚冬进周焕福陈秀丽杨曌
Owner 连云港市邦本科技有限公司