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Low-dielectric-constant ceramic dielectric material for low-temperature sintered MLCC and preparation method thereof

A technology of low dielectric constant and ceramic medium, which is applied in the field of low-permittivity ceramic dielectric material and its preparation for low-temperature sintered MLCC. Poor performance and other problems, to achieve the effect of low cost of raw materials and processes, stable dielectric properties, and low dielectric loss

Inactive Publication Date: 2021-03-19
无锡鑫圣慧龙纳米陶瓷技术有限公司
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  • Application Information

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Problems solved by technology

[0003] At present, low-temperature sintered radio-frequency low-dielectric constant MLCC materials in the MLCC ceramic industry have an important application shortcoming, that is, the stability of product batches is poor. The reason is that the low-temperature sintered state of the dielectric material used is not stable enough. In particular, the sintering temperature range of materials within the temperature range of 900°C attached to the pure silver inner electrode is relatively narrow, resulting in a small change in the sintering environment that can affect the sintering density and consistency of the material
The dielectric properties of existing MLCC ceramic dielectric materials are unstable, the dielectric loss is large, and the absolute value of the frequency temperature coefficient is large, which cannot meet the NP0 / C0G standard

Method used

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  • Low-dielectric-constant ceramic dielectric material for low-temperature sintered MLCC and preparation method thereof
  • Low-dielectric-constant ceramic dielectric material for low-temperature sintered MLCC and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a method for preparing the above-mentioned low-dielectric constant ceramic dielectric material for MLCC sintered at low temperature, comprising the following steps:

[0029] (1) According to the chemical composition aMgO-bCaO-cTiO 2 -dBaO-eB 2 o 3 -fSiO 2 -gLi 2O carry out batching to each starting raw material, mix raw material with deionized water as dispersion medium; Wherein, a, b, c, d, e, f, g represent molar percentage independently respectively, and satisfy following condition: 45% mol≤a≤55%mol, 2%mol≤b≤5%mol, 20%mol≤c≤30%mol, 5%mol≤d≤15%mol, 5%mol≤e≤15%mol, 5% mol≤f≤15%mol, 5%mol≤g≤15%mol, a+b+c+d+e+f+g=100mol%;

[0030] The starting raw materials for preparing the ceramic dielectric material are not limited to the oxides of each element, and can be replaced by carbonates, nitrates, organic metal salts, etc. of each constituent element, and the purity of each starting material is greater than 99%, but also No special re...

Embodiment 1-6

[0042] The preparation method of low dielectric constant ceramic dielectric material for MLCC sintered at low temperature comprises the following steps:

[0043] (1) According to the chemical composition aMgO-bCaO-cTiO 2 -dBaO-eB 2 o 3 -fSiO 2 -gLi 2 O to MgO, CaO, TiO 2 , BaO, B 2 o 3 , SiO 2 , Li 2 O is used for batching, and the raw materials are mixed with deionized water as the dispersion medium; wherein, a, b, c, d, e, f, and g respectively independently represent molar percentages, and the specific values ​​are as shown in Table 1;

[0044] (2) Disperse and pulverize the mixed powder by ball milling process to make a slurry;

[0045] (3) After drying the slurry, calcining at 750°C for 5 hours to synthesize matrix powder;

[0046] (4) Disperse, pulverize and dry the above-mentioned matrix powder by ball milling process;

[0047] (5) Add polyvinyl alcohol solution to the base powder after step (4) and mix and then granulate, and press into a cylindrical ceramic...

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Abstract

The invention discloses a low-dielectric-constant ceramic dielectric material for a low-temperature sintered MLCC. The phase of the ceramic dielectric material comprises Mg2TiO3, CaTiO3, Ba3B6SiO14 and LiBSiO4, the chemical composition of the ceramic dielectric material is aMgO-bCaO-cTiO2-dBaO-eB2O3-fSiO2-gLi2O, and a, b, c, d, e, f and g independently represent mole percentages. The ceramic dielectric material has a low dielectric constant and low dielectric loss, the frequency temperature coefficient of the ceramic dielectric material meets the NP0 / C0G standard, the sintering temperature ofthe ceramic dielectric material has wide adaptability, the ceramic dielectric material has stable dielectric properties the production cost is low, and the ceramic dielectric material can be widely used for manufacturing radio frequency MLCC devices.

Description

technical field [0001] The invention belongs to the technical field of electronic information materials, and in particular relates to a low-permittivity ceramic dielectric material for MLCC sintered at low temperature and a preparation method thereof. Background technique [0002] In order to meet the high-frequency and high-power requirements of electronic components such as communication equipment, military industry, and medical equipment, RF high-Q chip multilayer ceramic capacitors (MLCC) with high current carrying capacity have been developed rapidly. RF high Q value MLCC has the characteristics of high current carrying capacity, low equivalent series resistance, low equivalent series inductance, high Q value, high series resonance frequency, etc. It is widely used in communications, WLAN, satellite broadcasting equipment, medical electronics, missile systems In the radio frequency circuits of , aircraft radar and navigation systems, etc., it plays the role of coupling,...

Claims

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Application Information

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IPC IPC(8): C04B35/04C04B35/622
CPCC04B35/04C04B35/622C04B2235/3208C04B2235/3232C04B2235/3215C04B2235/3409C04B2235/3418C04B2235/3203C04B2235/602C04B2235/6567
Inventor 吉岸王晓慧金镇龙
Owner 无锡鑫圣慧龙纳米陶瓷技术有限公司
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