High dielectric constant ag characteristic dielectric ceramic material and preparation method thereof

Abstract

The invention provides a high dielectric constant AG characteristic dielectric ceramic material and a preparation method thereof. This kind of dielectric ceramic material with high dielectric constant AG characteristics, its raw material components are: wBaO xNd2O3 yTiO2 zBi2O3 compound, Li1 / 2Re1 / 2O3, BaB2O4, ZnO; its production method is to use wBaO xNd2O3 yTiO2 zBi2O3 Main base material, Li1 / 2Re1 / 2O3, ZnO, BaB2O4 as additives, water as dispersion medium, ball milling, drying, crushing and granulation, and pressing the granulated powder into a green disc, and then Raise the temperature to 1100-1200°C in an air atmosphere, heat-preserve and sinter for 2-4 hours, and then a dielectric ceramic material with high dielectric constant and AG characteristics is produced. The dielectric ceramic material prepared above does not contain harmful metals such as Pb, has a dielectric constant of over 90, has AG characteristics (90±20ppm / K), ultra-low dielectric loss, high temperature stability, and can be used to manufacture high-frequency , Monolithic capacitors with excellent thermal stability.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a high dielectric constant AG characteristic dielectric ceramic material and a preparation method thereof. Background technique [0002] With the rapid development and increasing popularity of modern electronic communication technology and aerospace military technology, the requirements for electronic components are getting higher and higher. Multilayer ceramic fixed capacitors (hereinafter referred to as MLCC), as an extremely widely used electronic component, are constantly developing in terms of miniaturization, integration, high capacity, high frequency, and high reliability. [0003] In order to realize the development and application of MLCC miniaturization, integration, high capacity, high frequency, high reliability and other characteristics, BaO-Nd is more researched at home and abroad. 2 o 3 -TiO 2 The dielectric ceramic of the system (hereinafte...

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Problems solved by technology

It introduces Bi 2 o 3 Although the prepared microwave dielectric ceramics can make the dielectric constant as high as 87-106, which has low loss and low resonance frequency temperature coefficient, its sintering temperature is as high as 1300-1360 ° C, and pure Pd internal electrodes are required when making MLCC. It cannot match the internal electrode Pd30 / Ag70, the production cost is high, and it does not have AG characteristics (90±20ppm / K)

Another example is that Wakino K and others introduced PbO into the BNT system to form a quaternary system for research, pointing out that with the increase of PbO content, the dielectric constant gradually increases, and the dielectric constant of microwave dielectric ceramics obtained by using this quaternary system can be up to 88, the resonant frequency temperature coefficient can tend to 0, however, due to the introduction of a certain amount of lead into the system, this not only causes great harm to human health and the environment in the process of capacitor preparation, use, and scrapping, but also affects the performance of capacitors. Stability has some adverse effects

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