Ceramic material for sintering multi-layer ceramic capacitor at low temperature and preparation method thereof

Abstract

The ceramic material for sintering a multi-layer ceramic capacitor at a low temperature and a preparation method thereof and relates to the technical field of functional ceramic materials. The ceramic material of the invention consists of 90 to 99 weight percent of major ingredients and 1 to 10 weight percent of minor ingredients, wherein 1) the major ingredient is a composite which is expressed by aBaO-bLn2O3-cBi2O3-dTiO2, wherein a, b, c and d represent a mole ratio respectively and a+b+c+d=1, a is more than or equal to 0.13 and less than or equal to 0.17, b is more than or equal to 0.12 and less than or equal to 0.22, c is more than or equal to 0.01 and less than or equal to 0.1, and d is more than or equal to 0.4 and less than or equal to 0.74; and 2) the minor ingredient is glass which is expressed by eBi2O3-Fb2O3-gZnO-hSiO2, wherein e, f, g and h represent weight percentages respectively and e+f+g+h=100, e is more than or equal to 50 and less than or equal to 90, f more than or equal to 5 and less than or equal to 30, g is more than or equal to 4 and less than or equal to 30, and h is more than or equal to 1 and less than or equal to 20. The ceramic material for sintering the multi-layer ceramic capacitor at the low temperature not only can keep a high dielectric constant under the condition of low-temperature sintering, but also has excellent NPO characteristics.

Description

Technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a ceramic material for low-temperature sintering of multilayer ceramic capacitors and a preparation method thereof. Background technique [0002] Multilayer Ceramic Capacitors (Multilayer Ceramic Capacitors) are abbreviated as MLCC, which is to alternate, stack and fire the electrode material and ceramic body into a whole in multiple layers. In the digital flat-panel TV, communication, network and other products, the circuit design of flat panel display (FPD), power supply module, receiving / transmitting and digital audio module, etc. requires a large number of stable temperature coefficients, high cut-off frequency, and resistance to large waves. NPO-type breakdown resistant MLCC components with characteristics such as surge voltage. According to EIA (Electronic Industries Association) standard: temperature stable NPO type MLCC refers to the capacitance value of ...

AI Technical Summary

Problems solved by technology

For example, in the "dielectric material and its manufacturing method" disclosed in Chinese patent 200410085174, the basic composition of the ceramic material is BaO-Nd 2 o 3 -TiO 2 -Bi 2 o 3 , its material conforms to the NPO standard, but its dielectric constant is low, only 40-60

Low dielectric constant will lead to low volume ratio of MLCC, which limits the miniaturization of MLCC components

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