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Microwave dielectric ceramic material for LTCC (low temperature co-fired ceramic) and preparation method thereof

A technology of microwave dielectric ceramics and dielectric ceramics, which is applied in the field of microwave dielectric ceramics, can solve the problems of selection limitations, restrictions, and inability to achieve balance at the same time, such as the type, quantity, position, and method of substitution ions, and achieve reduction in production costs. Lower sintering temperature and lower cost

Inactive Publication Date: 2018-04-20
HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the current literature data, in ceramic sintering temperature, dielectric constant, quality factor and temperature coefficient four Li 2 ZnTi 3 o 8 In terms of key parameters, the existing ion substitution technology is still unable to achieve balance at the same time, and the selection of the type, quantity, substitution position, and substitution method of the substitution ion is too limited, thus limiting the ion substitution of Li 2 ZnTi 3 o 8 Performance Development of Ceramics

Method used

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preparation example Construction

[0032] The preparation method of multi-ion substitution composite microwave dielectric ceramics suitable for LTCC technology provided by the present invention specifically includes the following steps:

[0033] (1) The main crystal phase ceramic powder can be prepared by traditional electronic ceramic powder preparation method and solid state reaction method: Li2CO3 (99wt%), ZnO (99wt%), TiO 2 (99wt%), CoO (99.5wt%), Nb 2 o 5 (99.5wt%) (its raw materials are all provided by Sinopharm Chemical Reagent Co., Ltd.) as the main raw material, according to the molar ratio in the molecular formula, the prepared raw materials are placed in the resin ball mill tank, and zirconia balls and absolute ethanol are added Or deionized water, wherein the mass ratio of zirconia ball: ball grinding material: anhydrous ethanol or deionized water is 1.0-1.5:1:0.5-2.0, ball milled for 20-24 hours, and baked at 1050°C for 2 hour, get Li 2 (Zn 0.92 co 0.08 )(Ti 0.95 Nb 0.05 ) 3 o 8 solid solu...

Embodiment 1

[0040] Select the molar ratio (1-x): x, x=0.1, prepare the composite ceramic powder according to the above process steps, use 8wt% PVA as the binder to granulate, and dry press it into a diameter green body under a pressure of 10MPa Sheets and cylinders with h=5mm, h=7mm, h=9mm, h=12mm, after the debonding treatment at 550°C, the samples were sintered at 950°C in air atmosphere, and after holding for 4 hours, composite ceramics were obtained sample. Both sides of the ceramic sample prepared above were polished, and the dielectric properties were tested. The test results were: εr=25.3, Q×f=112000GHz, τf=-7.2ppm / ℃.

Embodiment 2

[0042] Select the molar ratio (1-x): x, x=0.7, prepare composite ceramic powder according to the above process steps, use 10wt% PVA as the binder to granulate, and dry press it into a diameter green body under 10MPa pressure Sheets and cylinders with h=5mm, h=7mm, h=9mm, and h=12mm, after debonding treatment at 550°C, the samples were sintered at 855°C in an air atmosphere, and after holding for 4 hours, composite ceramics were obtained sample. Both sides of the ceramic sample prepared above were polished, and the dielectric properties were tested. The test results were: εr=13.7, Q×f=90500GHz, τf=8.1ppm / ℃.

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Abstract

The invention discloses a microwave dielectric ceramic material for LTCC (low temperature co-fired ceramic) and a preparation method thereof. The microwave dielectric ceramic material has a structureexpressed by (1-x)Li2(Zn0.92Co0.08)(Ti0.95Nb0.05)3O8.xBaV2O6, in the formula, x is 0.1 to 0.7. According to the preparation method, Li2(Zn0.92Co0.08)(Ti0.95Nb0.05)3O8 ceramic main crystal phases withthe simultaneously substituted A and B site ions are firstly prepared; then, a BaV2O6 ceramic composite phase is prepared; next, the compounding is performed according to the mole ratio of (1-x):x (xis 0.1 to 0.7); sintering is performed at 825 to 950 DEG C. The ceramic material has the advantages that the inherent sintering temperature is low; the quality is high; the Qxf value *f reaches 90000GHZ or higher; the temperature coefficient Tau f is in a range of + / -10ppm; the LTCC low-temperature co-firing technical requirements can be met; the material can be widely applied to the manufacturingof microwave devices such as resonators, filters, oscillators, amplifiers and media antennas; important application values are realized.

Description

technical field [0001] The invention relates to the field of microwave dielectric ceramics, in particular to a microwave dielectric ceramic material used in LTCC and a preparation method thereof. Background technique [0002] LTCC (Low Temperature Co-Firing) technology is a highly integrated and high-performance electronic packaging technology developed by Hughes in 1982. It has shown great promise in promoting the development of electronic components towards miniaturization, integration and multi-function. Huge advantage. LTCC technology requires microwave dielectric materials to be co-fired with electrodes such as Ag with high conductivity. The melting point of Ag is 961°C, which requires the sintering temperature of microwave dielectric ceramics to be below 900°C. At present, only a few microwave dielectric ceramics can be sintered at low temperature, such as ZnNb2O6 series, Ca[(Li1 / 3Nb2 / 3)1-xTix]O3-δ series, Li2O-Nb2O5-TiO2 series, BiNbO4 series, ZnO-TiO2 series, etc. ...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/622C04B35/638
CPCC04B35/453C04B35/622C04B35/638C04B2235/3203C04B2235/3215C04B2235/3232C04B2235/3239C04B2235/3251C04B2235/3275C04B2235/6567C04B2235/96
Inventor 彭建国彭铁缆汤育才张学华
Owner HUNAN SEEDER ELECTRONICS CERAMIC TECH IND PARK DEV CO LTD
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