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LTCC low-frequency dielectric ceramic capacitor material and preparation method thereof

A technology of dielectric ceramics and capacitors, which is applied in the field of low-temperature sintering and ultra-high temperature stable multilayer ceramic capacitor materials and its preparation. It can solve the problems of non-compliance with environmental protection ROHS requirements, low dielectric constant, high sintering temperature, etc., and achieve stability. and good reproducibility, high dielectric room temperature constant, uniform grain effect

Inactive Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this stage based on BaTiO 3 The X9R ceramic material of the system still has the problems of low dielectric constant, high sintering temperature, large loss, and does not meet the environmental protection ROHS requirements.

Method used

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  • LTCC low-frequency dielectric ceramic capacitor material and preparation method thereof
  • LTCC low-frequency dielectric ceramic capacitor material and preparation method thereof
  • LTCC low-frequency dielectric ceramic capacitor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Mix the raw materials evenly according to the raw material composition and mass percentage content of the sintering aid: 17% Bi 2 o 3 , 23%K 2 CO 3 , 20%TiO 2 , 20% LiF, 20% SiO 2 ;

[0046] Mix the raw materials evenly, add deionized water, ball mill for 12 hours, then dry at 80°C, then calcinate at 1000°C for 12 hours, with a heating rate of 5°C / min, and cool naturally to obtain a sintering aid;

[0047] (2) According to the raw material composition and mass percentage content of metal oxide, the raw materials are evenly mixed: 30% Nb 2 o 5 , 20%Co 3 o 4 , 20% WO 3 , 10% MnCO 3 , 10% Re 2 o 3 (Re is Sm), 10% CuO.

[0048] The mixed raw materials were added to deionized water, ball milled for 5 hours, and dried at 80°C to obtain ceramic powder of metal oxides;

[0049] (3) According to the BaTiO 3 On the basis of adding 3% mass percentage of sintering aid and 3% metal oxide stoichiometric ratio for secondary batching, uniform mixing, adding deionized...

Embodiment 2

[0056] (1) Mix the raw materials uniformly according to the raw material composition and mass percentage content of the sintering aid: 8% Bi 2 o 3 , 22%K 2 CO 3 , 20%TiO 2 , 29% LiF, 21% SiO 2 ;

[0057] Mix the raw materials evenly, add deionized water, ball mill for 13 hours, then dry at 80°C, then calcinate at 1000°C for 12 hours, with a heating rate of 5°C / min, and cool naturally to obtain a sintering aid;

[0058] (2) Mix the raw materials evenly according to the raw material composition and mass percentage content of the metal oxide: 10% Nb 2 o 5 , 10%Co 3 o 4 , 20% WO 3 , 30% MnCO 3 , 21%Re 2 o 3 (Re is Sm), 9% CuO.

[0059] The mixed raw materials were added to deionized water, ball milled for 5 hours, and dried at 80°C to obtain ceramic powder of metal oxides;

[0060] (3) According to the BaTiO 3 On the basis of adding 3% mass percentage of sintering aid and 3% metal oxide stoichiometric ratio for secondary batching, uniform mixing, adding deionized wa...

Embodiment 3

[0067] (1) Mix the raw materials evenly according to the raw material composition and mass percentage content of the sintering aid: 23% Bi 2 o 3 , 19%K 2 CO 3 , 22%TiO 2 , 17% LiF, 19% SiO 2 ;

[0068] Mix the raw materials evenly, add deionized water, ball mill for 12 hours, then dry at 80°C, then calcinate at 1000°C for 12 hours, with a heating rate of 5°C / min, and cool naturally to obtain a sintering aid;

[0069] (2) According to the raw material composition and mass percentage content of metal oxide, the raw materials are evenly mixed: 18%Nb 2 o 5 , 22%Co 3 o 4 , 20% WO 3 , 25% MnCO 3 , 11%Re 2 o 3 (Re is Nd), 4% CuO.

[0070] The mixed raw materials were added to deionized water, ball milled for 5 hours, and dried at 80°C to obtain ceramic powder of metal oxides;

[0071] (3) According to the BaTiO 3 On the basis of adding 3% mass percentage of sintering aid and 3% metal oxide stoichiometric ratio for secondary batching, uniform mixing, adding deionized wa...

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Abstract

The invention discloses an LTCC low-frequency dielectric ceramic capacitor material and a preparation method thereof. The material uses BaTiO3 as a main material with the addition of 0.5% to 6.8% of a sintering aid and 1% to 11% of a metal oxide in weight percentages on the basis of the BaTiO3. The sintering aid is prepared from the following raw materials in percentages by weight: 0.3% to 32% of Bi2O3, 1% to 28% of K2CO3, 1% to 22% of TiO2, 3% to 38% of LiF and 2% to 31% of SiO2; the metal oxide is prepared from the following raw materials in percentages by weight: 0.2% to 32% of Nb2O5, 0.5% to 28% of Co3O4, 0.9% to 22% of WO3, 0.4% to 37% of MnCO3, 0.6% to 33% of Re2O3 and 1.1% to 10% of CuO. The sintering temperature is high (800 DEG C to 900 DEG C) and accords with and exceeds the EIA X9R standard, the material has the advantages of being low in dielectric loss, high in dielectric constant, high in reliability, high in uniformity and environment-friendly, the working temperature range is between -55 DEG C and +230 DEG C, and the material adapts severe environment requirements.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a low-temperature sintered ultra-high temperature stable multilayer ceramic capacitor material and a preparation method thereof. Background technique [0002] Capacitors are an important class of passive electronic devices. They are indispensable devices in the electronics, communication and information industries. They can store charges, cut off DC, filter AC, and provide resonance and oscillation. Chip multilayer ceramic capacitors (MLCC or MCC, Surface Mount Multilayer Ceramic Capacitor), also known as monolithic capacitors, are new electronic components. Because of its superior performance, wide capacitance range, complete variety, miniaturization, and chip type, it has been widely used. With the rapid growth of the output of portable electronic products and the development of surface mount technology (SMT), MLCC applications have accounted for the first c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H01G4/12
CPCC04B35/468C04B2235/3224C04B2235/3251C04B2235/3258C04B2235/3262C04B2235/3277C04B2235/3281C04B2235/442H01G4/1227
Inventor 张宝林肖谧毛陆虹
Owner TIANJIN UNIV
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