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Ternary microwave medium material of Li2O-CoO2-TiO2 and low temperature sintering method

A microwave dielectric material, V2O5 technology, applied in the field of microwave dielectric ceramics, can solve problems such as Ag melting, and achieve the effect of simple chemical composition and preparation process

Inactive Publication Date: 2010-11-24
QIDONG CHUANGLU NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If Ag is combined with a dielectric ceramic whose sintering temperature is higher than 960°C to form a multilayer ceramic capacitor, there will be a problem that Ag is melted out during the sintering of the dielectric ceramic material

Method used

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  • Ternary microwave medium material of Li2O-CoO2-TiO2 and low temperature sintering method
  • Ternary microwave medium material of Li2O-CoO2-TiO2 and low temperature sintering method
  • Ternary microwave medium material of Li2O-CoO2-TiO2 and low temperature sintering method

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Experimental program
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Effect test

Embodiment 1

[0022] 1) First, more than 99.9% of the analytically pure raw material Li 2 CO 3 、Co 2 o 3 and TiO 2 Moore Billy 2 CO 3 :Co 2 o 3 :TiO 2 = 2:1:6 to prepare the main powder;

[0023] 2) Prepare the obtained powder from step (1) by wet ball milling 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 crushed, and 1% by weight % low melting point substance H 3 BO 3 .

[0024] 3) Mix the product obtained in step (2) by wet ball milling for 12 hours. The solvent is distilled water. After drying, add a binder and granulate it, then press and shape it, remove the glue at 550°C, and finally dry it in the atmosphere at 850°C Sintering for 2 hours; the binder uses a polyvinyl alcohol aqueous solution with a mass concentration of 5%, and its dose accounts for 6% of the total mass of the main powder obtained in step (1), so that a low-temperature sintered LTCC microwave dielectric cer...

Embodiment 2

[0026] 1) First, more than 99.9% of the analytically pure raw material Li 2 CO 3 、Co 2 o 3 and TiO 2 Moore Billy 2 CO 3 :Co 2 o 3 :TiO 2 = 2:1:6 to prepare the main powder;

[0027] 2) Prepare the obtained powder from step (1) by wet ball milling 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 crushed, and 1% by weight % low melting point substance H 3 BO 3 .

[0028] 3) Mix the product obtained in step (2) by wet ball milling for 12 hours. The solvent is distilled water. After drying, add a binder and granulate, then press and shape, debinding at 550°C, and finally in an atmosphere at 875°C Sintering for 2 hours; the binder uses a polyvinyl alcohol aqueous solution with a mass concentration of 5%, and its dose accounts for 6% of the total mass of the main powder obtained in step (1), so that a low-temperature sintered LTCC microwave dielectric ceramic material can ...

Embodiment 3

[0030] 1) First, more than 99.9% of the analytically pure raw material Li 2 CO 3 、Co 2 o 3 and TiO 2 Moore Billy 2 CO 3 :Co 2 o 3 :TiO 2 = 2:1:6 to prepare the main powder;

[0031] 2) Prepare the obtained powder from step (1) by wet ball milling 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 crushed, and 4% by weight % low melting point substance H 3 BO 3 .

[0032] 3) Mix the product obtained in step (2) by wet ball milling for 12 hours. The solvent is distilled water. After drying, add a binder and granulate, then press and shape, debinding at 550°C, and finally in an atmosphere at 875°C Sintering for 2 hours; the binder uses a polyvinyl alcohol aqueous solution with a mass concentration of 5%, and its dose accounts for 6% of the total mass of the main powder obtained in step (1), so that a low-temperature sintered LTCC microwave dielectric ceramic material can ...

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Abstract

The invention discloses a ternary microwave medium material of Li2O-CoO2-TiO2 and a low temperature sintering method. The microwave medium material consists of 96-99.5wt% of Li2CoTi3O8 and 0.5-4wt% of low melting point substance M, wherein the M is one of the H3BO3, the BaCu(B2O5) and the V2O5. The low temperature sintering method comprises the following steps of: mixing for 12 hours by wet ball mill, wherein the solvent is distilled water; presintering for 4 hours in atmosphere at 900 DEG C after drying; adding a bonder in the presintered powder and prilling; compressing and molding; and finally sintering for 2 hours in atmosphere at 850-950 DEG C. The bonder is a 5% polyving akohol solution by mass concentration and accounts for 6% of the total weight of the original powder. The ceramic material has low sintering temperature, high frequency dielectric constant (epsilon r) of 20-30, Q*f value of 8000-30000GHz and lower temperature coefficient of resonance frequency (tau f) and can not react with silver (Ag), thereby the co-sintering requirement with low cost silver electrode can be satisfied and the manufacturing cost of the apparatus can be greatly reduced.

Description

technical field [0001] The invention relates to a low-temperature sintered lithium-based microwave dielectric ceramic material and a preparation method thereof, belonging to the field of microwave dielectric ceramics. 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, and have very important applications in portable mobile phones, car phones, cordless phones, TV satellite receivers, military radars, etc. [0003] Dielectric ceramics used in the microwave frequency band should meet the following requirements for dielectric properties: (1) High relative permittivity ε r In order to facilitate t...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 褚冬进方亮周焕福陈秀丽杨曌
Owner QIDONG CHUANGLU NEW MATERIAL CO LTD
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