Ceramic material for sintering multilayered ceramic capacitor at low temperature

Abstract

The invention discloses a ceramic material for sintering a multilayered ceramic capacitor at low temperature and relates to the technical field functional ceramic materials. The ceramic material is prepared from a main material with the weight percent content of 90 to 99 weight percent and an auxiliary material with the weight percent content of 1 to 10 weight percent: 1) the main material is a composition represented as aBaO-bLn2O3-cBi2O3-dTiO2, wherein a, b, c and d independently represent molar ratios respectively: the sum of the a, b, c and d is equal to 1, the a is greater than or equal to 0.13 and less than or equal to 0.17, the b is greater than or equal to 0.12 and less than or equal to 0.22, the c is greater than or equal to 0.01 and less than or equal to 0.1 and the d is greaterthan or equal to 0.4 and less than or equal to 0.74; 2) the auxiliary material is glass represented as eBi2O3-fB2O3-gZnO-hSiO2, wherein e, f, g and h independently represent weight percent respectively: the sum of e, f, g and h is equal to 100, the e is greater than or equal to 50 and less than or equal to 90, the f is greater than or equal to 5 and less than or equal to 30, the g is greater thanor equal to 4 and less than or equal to 30 and the h is greater than or equal to 1 and less than or equal to 20. The ceramic material disclosed by the invention can keep a very high dielectric constant under a low-temperature sintering condition and the NPO property is good.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to ceramic materials for low-temperature sintered multilayer ceramic capacitors and a preparation method thereof. Background technique [0002] Multilayer Ceramic Capacitors (Multilayer Ceramic Capacitors) referred to as MLCC, it is the electrode material and the ceramic green body alternately stacked in multiple layers and fired into a whole. In the digital flat panel TV, communication, network and other products, in the circuit design of flat panel display (FPD), power supply module, receiving / transmitting and digital audio module, etc., a large number of products need to have stable temperature coefficient, high cut-off frequency, and large wave resistance. NPO breakdown-resistant MLCC components with surge voltage and other characteristics. According to the International Electronic Industries Association EIA (Electronic Industries Association) standard: tem...

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-Nd2O3-TiO2-Bi2O3, and its material meets 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