Ceramic dielectric material and COG type multilayer ceramic capacitor

Abstract

The invention provides a ceramic dielectric material and a COG type multilayer ceramic capacitor, the ceramic dielectric material comprises a principal crystalline phase component, a modified additive and a sintering aid, the principal crystalline phase component is xCaZrO3 + ySrZrO3, and x/y is greater than or equal to 1 and less than or equal to 20; the modified additive comprises Re2O3 and one or more of MnCO3, Al2O3, SrCO3, MgTiO3 and CaTiO3, and Re is at least one rare earth element selected from Y, Ho, Yb, Gd, Dy, Sm, Nd and Er. Through selection of material components, it is guaranteed that the material has excellent dielectric property and reliability, the material can be matched with a nickel electrode, sintering is conducted in a reducing atmosphere and at a low temperature, grain growth is effectively restrained, grains are fine, uniform and compact, the reliability and thinning of a product are improved, and the product quality is improved. And finally obtaining the ceramic dielectric material which can be used for the COG type multilayer ceramic capacitor.

Description

technical field [0001] The invention relates to the technical field of multilayer ceramic capacitors, in particular to a ceramic dielectric material and a COG type multilayer ceramic capacitor. Background technique [0002] Capacitors are one of the electronic components widely used in electronic equipment. They are widely used, large in amount and irreplaceable. With the rapid development of electronic technology, the emergence and development of new electronic products represented by mobile phones, flat panel displays, and automotive electronics have brought good opportunities for the development of capacitors. As an important part of capacitors, multi-layer ceramic capacitors (Multi-layer Ceramic Capacitor, abbreviated as MLCC) have many advantages such as small size, high insulation resistance, and low inductance, and are very popular. They are especially suitable for increasing circuit assembly density and reducing the size of the whole machine. Volume, which makes MLC...

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Problems solved by technology

After firing, the crystal grains are large, and MLCCs below 3 μm cannot be prepared, and the dielectric layer cannot be thinned, and large capacity cannot be achieved

CN102964122A discloses a dielectric ceramic composition and a method for making electronic components thereof. The dielectric ceramic composition includes a main crystal phase, a modification additive and a sintering aid, and the structural formula of the main crystal phase is (Mg γ Sr α Ca (1-α-γ) ) m (Ti β Zr 1-β )O 3 , where 0≤α≤1, 0≤γ≤1, 0≤β≤0.1, 0.9≤m≤1.1, the modified additive is MnCO 3 , MgCO 3 , Re 2 o 3 One or more of them, where Re 2 o 3 For rare earth oxides, sintering aids include BaCO 3 , CaCO 3 , SiO 2 , Li 2 CO 3 , B 2 o 3 , Al 2 o 3 One or more of them, but its dielectric constant is only 20-30, which is too low to achieve large capacity

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