Low-temperature sintered giant dielectric constant fine-grained ceramic material and its preparation method and application

Abstract

The invention discloses a low-temperature-sintered giant-dielectric constant fine-grained ceramic material and a preparation method and the application thereof. The dielectric ceramic comprises a mainmaterial and a modifier, wherein the main material is Ba0.98Ca0.02Zr0.12Ti0.88O3, and the modifier comprises two or more of MnCO3, Nb2O5, Y2O3, MgO and SiO2. The dielectric ceramic is prepared from the main material and the modifier by performing ball milling, drying, grinding and sieving; the fine-grained ceramic with high density can be obtained by performing spark plasma sintering (SPS) on thedielectric ceramic. Low-temperature sintering of the giant-dielectric constant ceramic is achieved, and the ceramic with high density and fine grain size is obtained; the dielectric ceramic materialhas high dielectric constant, low loss, a good capacity temperature characteristic and excellent comprehensive electrical properties; in addition, raw materials of the dielectric ceramic material arelow in cost, and do not contain toxic elements such as lead, cadmium, mercury and hexavalent chromium, so that the dielectric ceramic material is an environment-friendly high-dielectric constant ceramic material.

Description

technical field [0001] The invention belongs to the technical field of functional ceramic materials, and relates to a dielectric ceramic material and a preparation method, in particular to a low-temperature sintered fine-grained ceramic material with a large dielectric constant and a preparation method. Background technique [0002] At present, the rapid development of electronic complete machines puts forward strict requirements on the miniaturization, high specific capacity, low cost and high reliability of electronic components such as ceramic capacitors, and puts forward higher requirements on the performance of corresponding dielectric ceramic materials. When the capacitor structure and process conditions are determined, the capacitance of the capacitor is mainly determined by the dielectric constant of the dielectric ceramic material, so improving the dielectric constant of the material is the key to miniaturization of the capacitor. The room temperature dielectric con...

AI Technical Summary

Problems solved by technology

In the field of material research and development, such as CCTO, Nb-Ln-Ti system (Ln is Bi, Al, Y and other positive trivalent elements) has a huge dielectric constant, but usually has high loss or low insulation resistance, and is very sensitive to the process, which is still under research stage, there is still some distance from practical application

Images