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Low-temperature preparation method of low-dielectric microwave medium ceramic

A technology of microwave dielectric ceramics and low temperature, applied in the field of microwave dielectric ceramics, can solve the problems of high sintering temperature, inability to apply LTCC, and limit wide application, etc., to achieve the effects of promoting ceramic sintering, improving compactness, and low cost

Inactive Publication Date: 2017-11-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because its sintering temperature is as high as 1250°C, it cannot be applied to LTCC. Only by lowering its sintering temperature below 960°C can it exert its excellent performance advantages in LTCC.
At present, the method of adding glass as a sintering aid is usually used to reduce the sintering temperature. However, because the added glass is easy to chemically react with the glass contained in the conductive silver paste, it limits its wide application in LTCC.

Method used

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  • Low-temperature preparation method of low-dielectric microwave medium ceramic
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  • Low-temperature preparation method of low-dielectric microwave medium ceramic

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Embodiment 1

[0026] The invention discloses a low-temperature preparation method of low-medium microwave dielectric ceramics, which comprises the following steps:

[0027] Step A: ingredients; Li 2 CO 3 , ZnO, MgO, SiO 2 According to the general chemical formula Li 2 (Mg 0.8 Zn 0.2 ) SiO 4 Perform batching to form a mixture;

[0028] Step B: ball milling; put the mixture prepared in step A into a polytetrafluoroethylene ball milling tank, use absolute ethanol as a dispersant, and zirconia balls as a ball milling medium, wherein: the mass ratio of mixture: grinding balls: absolute ethanol 1: 5: 1.5, ball milled on a planetary ball mill for 12 hours; obtain the first ball mill that is uniformly mixed;

[0029] Step C: drying and sieving; putting the first ball abrasive obtained in step B into an oven at 80°C to dry to obtain the first dry powder;

[0030] Step D: pre-burning; place the dry powder obtained in step C on Al 2 o 3 In a crucible, pre-fired for 4 hours under an atmospher...

Embodiment 2

[0036] The invention discloses a low-temperature preparation method of low-medium microwave dielectric ceramics, which comprises the following steps:

[0037] Step A: ingredients; Li 2 CO 3 , ZnO, MgO, SiO 2 According to the general chemical formula Li 2 (Mg 0.8 Zn 0.2 ) SiO 4 Perform batching to form a mixture;

[0038] Step B: ball milling; put the mixture prepared in step A into a polytetrafluoroethylene ball milling tank, use absolute ethanol as a dispersant, and zirconia balls as a ball milling medium, wherein: the mass ratio of mixture: grinding balls: absolute ethanol 1: 5: 1.5, ball milled on a planetary ball mill for 12 hours; obtain the first ball mill that is uniformly mixed;

[0039] Step C: drying and sieving; putting the first ball abrasive obtained in step B into an oven at 80°C to dry to obtain the first dry powder;

[0040] Step D: pre-burning; place the dry powder obtained in step C on Al 2 o 3 In a crucible, pre-fired for 4 hours under an atmospher...

Embodiment 3

[0046] The invention discloses a low-temperature preparation method of low-medium microwave dielectric ceramics, which comprises the following steps:

[0047] Step A: ingredients; Li 2 CO 3 , ZnO, MgO, SiO 2 According to the general chemical formula Li 2 (Mg 0.8 Zn 0.2 ) SiO 4 Perform batching to form a mixture;

[0048] Step B: ball milling; put the mixture prepared in step A into a polytetrafluoroethylene ball milling tank, use absolute ethanol as a dispersant, and zirconia balls as a ball milling medium, wherein: the mass ratio of mixture: grinding balls: absolute ethanol 1: 3: 2, ball milled on a planetary ball mill for 6 hours; obtain the first ball mill that is uniformly mixed;

[0049] Step C: drying and sieving; putting the first ball abrasive obtained in step B into an oven at 80°C to dry to obtain the first dry powder;

[0050] Step D: pre-burning; place the dry powder obtained in step C on Al 2 o 3 In a crucible, pre-fired for 4 hours under an atmospheric ...

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Abstract

The invention discloses a low-temperature preparation method of low-dielectric microwave medium ceramic, and belongs to the technical field of microwave medium ceramic. According to a chemical formula Li2(Mg1-xZnx)SiO4, burdening, ball mixing, drying and presintering are carried out to form a crystal phase, and then, compound sintering aids are added into presintered powder to carry out secondary ball mixing, drying and low-temperature sintering, so as to finally obtain the microwave medium ceramic material. Zn<2+> is used for replacing Mg<2+> so as to preliminarily lower the densifying temperature of the microwave medium ceramic and improve the dielectric property of the microwave medium ceramic; the compound sintering aids form a liquid phase in a subsequent sintering process, so that the sintering temperature is further lowered to 900DEG C, and in addition, the compactness of a microwave medium ceramic material is improved. Preparation with the method provided by the invention is favorable for application of Li2MgSiO4-based microwave medium ceramic with a low dielectric constant and a high quality factor into LTCC (Low Temperature Co-Fired Ceramic), and the requirements of the microwave communication industry are met.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, in particular to a low-temperature preparation method of low-medium microwave dielectric ceramics. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency circuits and perform one or more functions. They are key basic materials in modern communication technology. The performance index of microwave dielectric ceramics largely determines the performance of microwave communication devices and systems. With the further expansion of the working frequency of modern communication technology to the high-frequency range, especially after entering the millimeter wave and submillimeter wave bands, the dielectric loss of the material increases significantly, the signal transmission delay time is longer, and the signal attenuation becomes more prominent. The appearance of this phenomenon is closely relate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/20C04B35/622C04B35/64
CPCC04B35/20C04B35/622C04B35/64C04B2235/3203C04B2235/3206C04B2235/445
Inventor 李元勋李亚菲苏桦郑阳管军张怀武韩莉坤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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