Inner electrode of glass-ceramic stacked capacitor and preparation method of the inner electrode

Abstract

The invention discloses an inner electrode of a glass-ceramic stacked capacitor and a preparation method of the inner electrode in the technical field of functional materials. The inner electrode structurally comprises glass-ceramic dielectric layers and silver paste electrode layers which are stacked, wherein an inner electrode transition layer is arranged between one glass-ceramic dielectric layer and one silver paste electrode layer which are adjacent to each other. The preparation process of the inner electrode comprises the steps of: firstly plating a metal film on each of the two surfaces of each glass-ceramic dielectric single sheet to serve as the inner electrode transition layer; and then coating a low-temperature silver paste electrode on the surface of each of the plated metal film layers, stacking multiple layers and later, conducting sintering. According to the invention, the structure and the preparation method of the inner electrode which is used for the glass-ceramic stacked capacitor and can be sintered at low temperature are found out, so that the sintering temperature is lowered by over 300 DEG C, the self-owned electrical property of a glass-ceramic dielectric material is maintained, the dielectric constant is kept at 176 approximately and the direct-current breakdown field strength is increased to about 33kV/mm. The preparation method is very suitable for preparing the high-voltage-resistant inner electrode of the glass-ceramic stacked capacitor.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and particularly relates to an internal electrode of a glass-ceramic laminated capacitor and a preparation method thereof, especially a high-strength electrode with lead niobate and sodium niobate as the ceramic phase and silicon dioxide as the glass phase. The invention discloses an internal electrode material for a multilayer capacitor based on a glass-ceramic material with high wear strength and high dielectric constant, and a preparation method thereof. Background technique [0002] Glass-ceramic materials have excellent ferroelectric and insulating properties due to their low-defect and void-free characteristics, and are widely used in small and large-capacity micro-multilayer ceramic capacitors, ultra-large-scale energy storage, and tuned microwave devices. One of the most widely used materials in ceramics. The internal electrode structure and material properties of the lamina...

AI Technical Summary

Problems solved by technology

Under normal technology, the internal electrodes between insulating dielectric materials in laminated capacitors are made by printing a single layer of metal paste (silver paste, silver-palladium mixed paste, nickel paste, etc.) at high temperature (≥600°C) and sintered. However, the preparation cost is expensive, and the internal electrode obtained from it is not dense. During the high-temperature sintering process, the internal electrode components are easy to penetrate into the dielectric, and the pores formed by the volatilization of the organic slurry are inevitable. A local electric field concentration is formed at the hole, resulting in an increase in the leakage current of the capacitor, a decrease in the insulation resistance, a decrease in the effective area of ​​the inner electrode, and a decrease in the field strength of the breakdown resistance. The actual application environment of the capacitor is severely restricted accordingly.

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