Medium material for high-reliability X8R-type multilayer ceramic capacitor and preparation method thereof

Abstract

The invention discloses a constitution of a medium material for a high-reliability X8R-type multilayer ceramic capacitor and a preparation method thereof. The medium material comprises the following main components: 100 mol of barium calcium titanate Ba1-XCaXTiO3 (x is more than 0.005 and less than or equal to 0.05), 0.1 to 0.6 mol of MnCO3, 0.2 to 2.0 mol of MgO, 1.5 to 5.5 mol of SiO2, 0.1 to 0.5 mol of Al2O3, 1.0 to 4.0 mol of ZrO2, 0.5 to 3.5 mol of at least one or more of Y2O3, Ho2O3, Er2O3, Yb2O3 and Gd2O3, and 0.01 to 0.5 mol of at least one or more of WO3, MoO3 and V2O5. According to the multilayer ceramic capacitor manufactured by the medium material, an inner electrode adopts nickel or nickel alloy, the multilayer ceramic capacitor satisfies the X8R characteristics of American ELA standard; moreover, the average service life under the high temperature load is 48 hours or more, and the reliability of the multilayer ceramic capacitor is excellent.

Description

technical field [0001] The invention relates to a dielectric material for a multilayer chip ceramic capacitor, in particular to a dielectric material for a multilayer ceramic capacitor with high reliability and conforms to X8R characteristics using nickel electrodes. Background technique [0002] At present, Multilayer Ceramic Capacitors (Multilayer Ceramic Capacitors) referred to as MLCC are widely used in DC blocking, coupling, bypass, frequency discrimination, etc.; It is formed by firing a whole body and then firing the external electrodes at the end; MLCC is favored for its small size, high insulation resistance, low inductance and many other advantages, especially suitable for chip surface mount technology, which can greatly increase the circuit assembly density , Reduce the size of the whole machine, this outstanding feature makes MLCC the largest and fastest growing chip component in the world. [0003] According to the EIA (Electronic Industries Association) standa...

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Problems solved by technology

[0004] Although the MLCC dielectric materials proposed in many patent documents can meet the requirements of X8R characteristics, the life time under high temperature load is short; in order to improve the high temperature load life of the dielectric material, this paper synthesizes barium calcium titanate by hydrothermal synthesis method, and titanate Barium-calcium is the main component, and part of Ca is replaced by Ti to produce lattice defects, so barium-calcium titanate has high antigenicity; in order to meet the X8R characteristics, barium-calcium titanate is doped and modified to make the Curie point to Move in the direction of high temperature and widen the Curie peak at the same time to obtain a capacity temperature change rate within ±15% at a temperature of -55 to 150 ° C, which meets the X8R characteristic requirements

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