Ceramic dielectric material, ceramic capacitor and preparation method thereof
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A technology of ceramic dielectric materials and ceramic capacitors, applied in the field of materials, can solve problems such as difficulty in forming a core-shell structure, difficulty in meeting X5R specifications, and reduction in the number of grain boundaries, achieving high dielectric constant, easy operation, and high density Effect
Pending Publication Date: 2022-06-03
GUANGDONG FENGHUA ADVANCED TECH HLDG +1
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In addition, when the thickness of the dielectric layer is constant, increasing the grain size will lead to a decrease in the number of grain boundaries, which may lead to a decrease in reliability, but reducing the grain size makes it difficult to form a stable core-shell structure, and it is difficult to achieve the X5R Specification
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Embodiment 1
[0052] A ceramic capacitor of this embodiment, wherein the raw material of the ceramic dielectric material includes the following components in molar percentage: BaTiO 3 95%, BaSiO 3 1.5%, MgO 0.8%, V 2 O 5 1%, Dy 2 O 3 0.6%, Y 2 O 3 0.6%, Tm 2 O 3 0.5%; BaTiO 3 The particle size is 180nm;
[0053] The specific preparation method is as follows:
[0054] (1) Preparation of ceramic dielectric material: weigh and mix the components according to the above molar percentages, use zirconia balls as the ball milling medium, place them in a ball mill, add ethanol solvent and carry out wet ball milling for 20 hours, and dry after ball milling to obtain Ceramic dielectric materials;
[0055] (2) Preparation of green body: The ceramic dielectric material in step (1) is made into a slurry, cast into a 0.9 μm film, and then a green body is formed by electrode printing, lamination, pressing and cutting; wherein, the electrode Nickel paste is used as the inner electrode during...
Embodiment 2
[0059] A ceramic capacitor of this embodiment, wherein the raw material of the ceramic dielectric material includes the following components in molar percentage: BaTiO 3 95%, BaSiO 3 2.3%, MgO 0.5%, V 2 O 5 1.5%, Dy 2 O 3 0.3%, Y 2 O 3 0.2%, Tm 2 O 3 0.2%; BaTiO 3 The particle size is 180nm; the preparation method is the same as that of Example 1.
Embodiment 3
[0061] A ceramic capacitor of this embodiment, wherein the raw material of the ceramic dielectric material includes the following components in molar percentage: BaTiO 3 96%, BaSiO 3 1.8%, MgO 0.5%, V 2 O 5 0.5%, Dy 2 O 3 0.4%, Y 2 O 3 0.2%, Tm 2 O 3 0.6%; BaTiO 3 The particle size is 180nm; the preparation method is the same as that of Example 1.
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Abstract
The invention discloses a ceramic dielectric material, a ceramic capacitor and a preparation method thereof, and belongs to the technical field of materials. The ceramic dielectric material comprises the following components in percentage by molar mass: 94.0-98.0% of barium titanate, 1.2-2.5% of a glass phase, 0.5-1.0% of an anti-reducing agent, 0.5-1.5% of an alkali metal compound and 0.5-3.0% of an oxide of a rare earth element, the oxides of the rare earth elements comprise Dy2O3, Y2O3 and Tm2O3, and the obtained ceramic dielectric material has stable capacitance characteristics, high dielectric constant and high temperature stability and is easier to laminate; the ceramic capacitor is formed by sintering a ceramic dielectric material serving as a raw material, the obtained ceramic capacitor meets the X5R standard, and the influence of sharp capacitance change caused by the temperature can be well stabilized within the normal temperature section; meanwhile, the preparation methods of the ceramic dielectric material and the ceramic capacitor provided by the invention are simple, simple and convenient to operate and free of toxic and harmful substances, and the prepared ceramic capacitor is high in density, small in crystal grain, few in defect and suitable for actual production and application.
Description
technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a ceramic dielectric material, a ceramic capacitor and a preparation method thereof. Background technique [0002] barium titanate (BaTiO) 3 ) is the base material of Class II capacitors in chip multilayer ceramic capacitors (MLCCs), with a high dielectric constant. In recent years, the miniaturization of mobile electronic devices makes MLCCs gradually develop in the direction of miniaturization and large capacity. Higher requirements are placed on various properties of barium titanate-based ceramic materials. The following formula is the calculation method of MLCC capacitance, where C is the capacitance, N is the number of dielectric layers, ε 0 is the vacuum dielectric constant, ε r is the dielectric constant of the material, S is the electrode area, and d is the thickness of the dielectric layer. [0003] [0004] Due to the fixed size of MLCCs of specifi...
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