Preparation method of X8R-property slice type multilayer ceramic capacitor

Abstract

The invention discloses a preparation method of an X8R-property slice type multilayer ceramic capacitor, comprising the following steps of: preparing ceramic slurry, making a dielectric membrane, alternately overprinting inner electrodes and dielectric layers, cutting, discharging glue, sintering, sealing ends and burning ends, wherein the used ceramic slurry in a barium titanate structure also comprises 0.1-5wt% of auxiliary components apart from BaTiO3 as a main component; the inner electrodes are made of nickel inner electrode materials; end electrodes are made of copper end electrode materials; and the sintering temperature is 1220 DEG C-1300 DEG C, and the sintering process comprises a temperature rise section, a high-temperature burning section, a temperature reducing section and a tempering section. As the X8R-property slice type multilayer ceramic capacitor is prepared by using materials of a base metal system for replacing expensive materials of a palladium silver system, theperformance reaches the level of X8R products of the palladium silver system, the upper-limit use temperature of the product reaches +150 DEG C, the change rate of the inner capacity in the temperature range of -55 DEG C-+150 DEG C is not greater than + / -15%, and the ceramic capacitor has high reliability and can effectively replace the X8R products of the palladium silver system; the method greatly reduces the production cost and saves scarce noble metal resources, and the producible capacity range of the product is wider than that of the materials of the palladium silver system.

Description

technical field [0001] The invention relates to chip electronic components, in particular to a method for preparing a chip multilayer ceramic capacitor with X8R characteristics. Background technique [0002] A capacitor is a component that can store electrical energy. It is one of the electronic components widely used in electronic equipment. It is widely used in DC blocking, coupling, bypass, filtering, tuning loops, control circuits, etc. Large and irreplaceable, its output accounts for more than 40% of the output of electronic components, and its output value accounts for more than 10% of the output value of electronic components. With the rapid development of electronic technology, especially the development of the whole machine industry, such as the continuous emergence of new electronic products represented by mobile phones, flat panel displays, automotive electronics, and lighting electronics, it has brought good development opportunities for the development of capaci...

AI Technical Summary

Problems solved by technology

There are already a few manufacturers in China that can produce them, but they all use the palladium-silver system as the raw material. The high price makes it unacceptable for most domestic automotive electronics and lighting electronics manufacturers, which leads to a decrease in product competitiveness and a small market share, which cannot change the domestic X8R products. The situation of demand dependence on imports

[0005] Therefore, some manufacturers try to reduce the palladium content in the internal electrode material to reduce product costs. However, as the sintering temperature of the low palladium content X8R-MLCC decreases, the density of the dielectric ceramic body decreases, resulting in a serious decline in the reliability of the final product.

Images