Ceramic dielectric material and COG type multilayer ceramic capacitor

A ceramic dielectric and modification technology, which is applied in the direction of laminated capacitors, capacitors, fixed capacitors, etc., can solve the problems that the dielectric layer cannot be thinned, cannot achieve large capacity, and cannot achieve large capacity, etc., to achieve excellent dielectric properties, Improve the dielectric performance and reliability, and the effect of uniform cross-section of the porcelain body

CN114188156APending Publication Date: 2022-03-15SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-03-15

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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.
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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...

Examples

Embodiment 1～32

[0029] This embodiment provides a kind of ceramic dielectric material, by the main crystal phase (xCaZrO 3 +ySrZrO 3 , x / y=10), modifying additives and sintering aids, the specific formula is shown in Table 1.

[0030] Table 1 Formulation composition of main crystal phase, modifying additives and sintering aids

[0031]

[0032]

[0033] The preparation method of the ceramic dielectric material of above-mentioned each embodiment is as follows:

[0034] (1) Preparation of main crystal phase components: CaCO with a purity of more than 99.5% is selected 3 , SrCO 3 , ZrO 2 Raw materials, according to CaZrO 3 , SrZrO 3 The composition ratios were weighed separately and calcined separately to obtain CaZrO 3 , SrZrO 3 , then the CaZrO 3 , SrZrO 3 Weigh and reserve according to the molar ratio of x / y.

[0035] (2) Preparation of ceramic dielectric material: The main crystal phase, modification additives, and sintering aids obtained in the previous step were wet-mixed,...

Embodiment 33

[0037] This embodiment provides a ceramic dielectric material whose main crystal phase is xCaZrO 3 +ySrZrO 3 , x / y=1, its formula is 100mol of main crystal phase, MnCO 3 2mol, Al 2 o 3 0.7mol, SrCO 3 0.8mol, MgTiO 3 0.2mol, CaTiO 3 2.0mol, Y 2 o 3 0.66mol, sintering aid ZnO0.8mol, H 3 BO 3 0.6mol, SiO 2 1.7mol.

Embodiment 34

[0039] This embodiment provides a ceramic dielectric material whose main crystal phase is xCaZrO 3 +ySrZrO 3 , x / y=5, its formula is 100mol of main crystal phase, MnCO 3 2mol, Al 2 o 3 0.7mol, SrCO 3 0.8mol, MgTiO 3 0.2mol, CaTiO 3 2mol, Y 2 o 3 0.66mol, sintering aid ZnO0.8mol, H 3 BO 3 0.6mol, SiO 2 1.7mol. .