Medium temperature sintered multilayer ceramic capacitor dielectric material

A capacitor dielectric and multilayer ceramic technology, which is applied in the field of X8R multilayer ceramic capacitor dielectric materials and its preparation, can solve the problems of high sintering temperature and inability to meet the use of Ag-Pd electrodes, and achieve lower sintering temperature and excellent dielectric Performance, the effect of promoting mass transfer

Inactive Publication Date: 2014-08-20
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the capacity change rate of the ceramic capacitor medium of the prior art though can reach the requirement of X8R, but its sintering temperature is too high, can not satisfy the deficiency that Ag-Pd electrode uses, provide a kind of middle temperature sintering (T s ≤1150°C) and X8R type multilayer ceramic capacitor dielectric material with excellent temperature stability and preparation method thereof

Method used

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  • Medium temperature sintered multilayer ceramic capacitor dielectric material
  • Medium temperature sintered multilayer ceramic capacitor dielectric material
  • Medium temperature sintered multilayer ceramic capacitor dielectric material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0031] First, weigh and analyze 2.6497g Na of pure grade (≥99%) with electronic balance 2 CO 3 , 11.6490g Bi 2 o 3 and 7.9898gTiO 2 Mix, use deionized water as the ball milling medium, dry and sieve after ball milling for 4 hours, calcined at 950°C, and keep warm for 4 hours to obtain Na 0.5 Bi 0.5 TiO 3 ;

[0032] 2.2410g NiO and 9.3033g Nb 2 o 5 , mixed, with deionized water as the ball milling medium, after ball milling for 4 hours, dried, sieved, calcined at 1000°C, and kept for 2 hours to obtain (NiO) 0.3 (NbO 2.5 ) 0.7 Compound, ball milled for the second time for 6 hours, dried, passed through 80 mesh sieve for subsequent use;

[0033] Then 22.3291g CaCO 3 and 27.5114 g ZrO 2 Mix, use deionized water as the ball milling medium, dry and sieve after ball milling for 4 hours, calcined at 1000°C, and keep warm for 2 hours to obtain CaZrO3 ;

[0034] 17g TiO 2 , 34g H 3 BO 3 , 26g ZnO and 23g Bi 2 o 3 Fully mixed, melted and quenched, ground and passed thr...

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Abstract

The invention discloses a medium temperature sintered multilayer ceramic capacitor dielectric material using BaTiO3 powder as a basic material, and on the basis of the BaTiO3 powder, the medium temperature sintered multilayer ceramic capacitor dielectric material also comprises 0.3-0.6% by mass of Na0.5Bi0.5TiO3; 0.6-1.5% by mass of (NiO) 1-x (NbO2.5) x (x =0.6-0.8); 1.0-3.0% by mass of CaZrO3 and 4-7% by mass of a glass fluxing agent; the Na0.5Bi0.5TiO3 is synthesized from Na2CO3, Bi2O3 and TiO2 in the molar ratio of 1:1:4; by addition of the sodium bismuth titanate and the glass fluxing agent, mass transfer in the sintering process can be effectively improved, the sintering temperature can be reduced, medium temperature sintering at the temperature lower 1150 DEG C can be realized, the medium temperature sintered multilayer ceramic capacitor dielectric material has excellent dielectric properties; in the temperature range of-55 to 150 DEG C, the rate of change of capacitance is within + / -12%, and the medium temperature sintered multilayer ceramic capacitor dielectric material has a high room temperature dielectric constant (-2700).

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a medium-temperature sintered X8R multilayer ceramic capacitor dielectric material with excellent temperature stability and a preparation method thereof Background technique [0002] Chip Multilayer Ceramic Capacitor (MLCC) is used as a basic electronic component, except for smart phones, tablet computers, radio and television, mobile communications, home computers, household appliances, measuring instruments, medical equipment and other civilian products and consumer products. In addition to being widely used in electronics, it has a wide range of applications in aerospace, tank electronics, military mobile communications, weapon warhead control, military signal monitoring and other military electronic equipment, as well as oil exploration and other industries. Barium titanate (BaTiO 3 )-based temperature-stable MLCC dielectric material has been a research ho...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 李玲霞柳亚然于经洋张宁陈俊晓
Owner TIANJIN UNIV
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