Medium-high voltage ceramic dielectric capacitor material with bias characteristic for medium temperature sintering

Abstract

The invention relates to a medium-high voltage ceramic dielectric capacitor material with a bias characteristic for medium temperature sintering. A formula of the medium-high voltage ceramic dielectric capacitor material is prepared from the following components in parts by mass: 100 parts of main material BaTiO3, 2.5 to 4.5 parts of modifying agent CaTiO3, 1.0 to 1.8 parts of Nb2O5, 0.05 to 0.35 part of MnCO3, 0 to 0.15 part of CeO2, 0.05 to 0.35 part of SrCO3, 0.05 to 0.30 part of Co2O3, 0 to 0.08 part of MgO, 0 to 0.20 part of Sm2O3, 0 to 0.10 part of Y2O3 and 2.5 to 4.0 percent of sintering aid, wherein the sintering aid contains three or four of ZnO, CaCO3, Li2CO3, H3BO3 and SiO2. The material disclosed by the invention has high breakdown voltage and the bias characteristic under the condition of keeping a high dielectric constant, and is suitable for preparing single-layer and multilayer ceramic dielectric capacitors.

Description

technical field

[0001] The invention belongs to the technical field of electronic information materials and components, and in particular relates to a medium-high voltage ceramic capacitor material with bias characteristics for medium-temperature sintering. Background technique

[0002] With the urgent demand for capacitors with high breakdown voltage, good temperature stability, and high reliability in the fields of computers, communications, aerospace, and missiles, ordinary X7R ceramics have been difficult to meet the needs of such capacitors. Stable production of ceramic materials with high breakdown voltage and high reliability has become an urgent problem to be solved at present, which is also the problem solved by this patent.

[0003] According to the EIA standard of the American Electronics Industry Association, the X7R capacitor ceramic material is based on the capacitance value at 25°C, and within the temperature range of -55 to +125°C, -15%≤ΔC / C 0 ≤+15%, dielect...

Examples

Embodiment 1

[0041] It is a medium and high voltage ceramic capacitor material with bias characteristics for medium temperature sintering. It is composed of main materials, modifiers and sintering aids. Among them, the main material is BaTiO with tetragonal crystal structure. 3 , granularity D 50 =0.65 μm, purity ≥99.8wt%.

[0042] CaTiO 3 Preparation: Weigh CaCO according to the molar ratio of 1:1 3 and TiO 2 , using deionized water as the medium, ball milling for 8 hours; drying at 120°C, grinding with an agate mortar, passing through a 100-mesh sieve; calcining at 1060°C for 3 hours to obtain the CaTiO 3 , sealed and stored in a ziplock bag for later use.

[0043] Preparation of sintering aid GF-1: Weigh the raw materials according to the formula, and its mass ratio is 22.7wt%H 3 BO 3 , 68.2wt% ZnO and 9.1wt% SiO 2 ;Choose deionized water as the ball milling medium, the ball milling time is 6 hours; dry at 80°C, the time is 12 hours; after grinding with agate mortar, pass throug...

Embodiment 2

[0057] It is a medium and high voltage ceramic capacitor material with bias characteristics for medium temperature sintering. It is composed of main materials, modifiers and sintering aids. Among them, the main material is BaTiO with tetragonal crystal structure. 3 , granularity D 50 =0.75 μm, purity ≥99.8wt%.

[0058] CaTiO 3 Preparation: Weigh CaCO according to the molar ratio of 1:1 3 and TiO 2 , using deionized water as the medium, ball milling for 8 hours; drying at 120°C, passing through a 100-mesh sieve; calcining at 1060°C for 3 hours to obtain the CaTiO 3 .

[0059] Preparation of sintering aid GF-2: Weigh the raw materials according to the formula, and its mass ratio is 25.6wt%H 3 BO 3 , 2.6wt% CaCO 3 , 64.1wt% ZnO and 7.7wt% SiO 2 ; choose deionized water as the ball milling medium, the ball milling time is 6 hours; dry at 80°C, the time is 12 hours; after grinding with agate mortar, pass through a 100 mesh sieve; calcined at 850°C, the time is 5 hours, Th...

technical field

[0001] The invention belongs to the technical field of electronic information materials and components, and in particular relates to a medium-high voltage ceramic capacitor material with bias characteristics for medium-temperature sintering. Background technique

[0002] With the urgent demand for capacitors with high breakdown voltage, good temperature stability, and high reliability in the fields of computers, communications, aerospace, and missiles, ordinary X7R ceramics have been difficult to meet the needs of such capacitors. Stable production of ceramic materials with high breakdown voltage and high reliability has become an urgent problem to be solved at present, which is also the problem solved by this patent.

[0003] According to the EIA standard of the American Electronics Industry Association, the X7R capacitor ceramic material is based on the capacitance value at 25°C, and within the temperature range of -55 to +125°C, -15%≤ΔC / C 0 ≤+15%, dielect...

Examples

Embodiment 1

[0041] It is a medium and high voltage ceramic capacitor material with bias characteristics for medium temperature sintering. It is composed of main materials, modifiers and sintering aids. Among them, the main material is BaTiO with tetragonal crystal structure. 3 , granularity D 50 =0.65 μm, purity ≥99.8wt%.

[0042] CaTiO 3 Preparation: Weigh CaCO according to the molar ratio of 1:1 3 and TiO 2 , using deionized water as the medium, ball milling for 8 hours; drying at 120°C, grinding with an agate mortar, passing through a 100-mesh sieve; calcining at 1060°C for 3 hours to obtain the CaTiO 3 , sealed and stored in a ziplock bag for later use.

[0043] Preparation of sintering aid GF-1: Weigh the raw materials according to the formula, and its mass ratio is 22.7wt%H 3 BO 3 , 68.2wt% ZnO and 9.1wt% SiO 2 ;Choose deionized water as the ball milling medium, the ball milling time is 6 hours; dry at 80°C, the time is 12 hours; after grinding with agate mortar, pass throug...

Embodiment 2

[0057] It is a medium and high voltage ceramic capacitor material with bias characteristics for medium temperature sintering. It is composed of main materials, modifiers and sintering aids. Among them, the main material is BaTiO with tetragonal crystal structure. 3 , granularity D 50 =0.75 μm, purity ≥99.8wt%.

[0058] CaTiO 3 Preparation: Weigh CaCO according to the molar ratio of 1:1 3 and TiO 2 , using deionized water as the medium, ball milling for 8 hours; drying at 120°C, passing through a 100-mesh sieve; calcining at 1060°C for 3 hours to obtain the CaTiO 3 .

[0059] Preparation of sintering aid GF-2: Weigh the raw materials according to the formula, and its mass ratio is 25.6wt%H 3 BO 3 , 2.6wt% CaCO 3 , 64.1wt% ZnO and 7.7wt% SiO 2 ; choose deionized water as the ball milling medium, the ball milling time is 6 hours; dry at 80°C, the time is 12 hours; after grinding with agate mortar, pass through a 100 mesh sieve; calcined at 850°C, the time is 5 hours, Th...

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