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Strontium titanate lead-free ceramic capacitance material

A technology of strontium titanate and capacitors, which is applied in the direction of fixed capacitor dielectric and fixed capacitor parts, etc., can solve the problems of human body and environmental hazards, and the withstand voltage value of lead-free ceramic capacitors is not high enough, so as to achieve the effect of increasing the withstand voltage value

Inactive Publication Date: 2007-11-21
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the ceramic material used to produce high-voltage ceramic capacitors contains a large amount of lead (often added in the form of lead titanate), so the lead poisoning of chemical lead elements will cause certain harm to the human body and the environment in the process of production, use and scrapping
[0003] At the same time, the withstand voltage value of lead-free ceramic capacitors with general formulations is not high enough

Method used

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Examples

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Embodiment Construction

[0008] In actual production, we use strontium carbonate SrCO 3 And titanium dioxide TiO 2 , Calcium carbonate CaCO 3 And titanium dioxide TiO 2 According to a certain ratio, through ball milling, mixing, drying, and then synthesizing at 1000 to 1200 degrees Celsius to obtain strontium titanate SrTiO 3 And calcium titanate CaTiO 3 .

[0009] After the titanate is obtained, ZnO 0.5-2%, manganese dioxide MnO can also be added 2 0.1-1%, zirconium dioxide Dy 2 O 3 4-8%, 3-5% cerium oxide and other small materials are mixed with the above titanate by stirring, ball milling and mixing according to a certain ratio, adding 8% polyvinyl alcohol for spray granulation, and the lead-free of this formula can be obtained. Capacitor material.

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Abstract

A lead-free capacitance material consists of strontium titanate 75%, calcium titanate 20% and bismuth 5%. The process is carried out by mixing, adding into polyvinyl alcohol, press forming and sintering at 1300 degree to obtain final product. The capacitance temperature property reaches to Y5E type, voltage-resisting value is improved to 25KV / mm, dielectric constant epsilon is approximately equal to 800, medium loss approaches to 0.0006 at AC 100Hz-10KHz.

Description

Technical field [0001] The invention relates to a capacitor material, especially a lead-free capacitor material. Background technique [0002] At present, the porcelain used in the production of high-voltage ceramic capacitors contains a large amount of lead (usually added in the form of lead titanate), so the lead poison of the chemical lead element will cause certain harm to the human body and the environment during the production, use and scrapping process. . [0003] At the same time, the withstand voltage of lead-free ceramic capacitors with general formulations is not high enough. Summary of the invention [0004] The task of the present invention is to provide a high-voltage-resistant lead-free ceramic capacitor material. [0005] In order to achieve the above objectives, the technical solutions adopted are: [0006] A lead-free capacitor material, which is characterized by being composed of 75% strontium titanate, 20% calcium titanate, and 5% bismuth titanate. After mixi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622H01G4/12
Inventor 颜欢周翔
Owner 颜欢