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Barium titanate-based lead-free high-voltage ceramic capacitor material

A technology of ceramic capacitors and barium titanate, which is applied in the field of lead-free capacitor materials, can solve the problems of small dielectric constant, insufficient withstand voltage value, and inability to meet the miniaturization of electronic circuits.

Inactive Publication Date: 2010-06-30
钱云春
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] At present, the widely used high-voltage ceramic capacitor materials often contain a large amount of lead. Lead is an element in the scope of strong pollutants. It is non-degradable and will cause long-term and lasting damage to the human body and the environment.
[0003] And at the same time, the dielectric constant of the lead-free ceramic capacitor material of the general formula is small, which cannot meet the needs of miniaturization of electronic circuits, and the withstand voltage value is not high enough

Method used

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Examples

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Embodiment Construction

[0008] In actual preparation, the barium carbonate BaCO 3 , Bismuth oxide Bi 2 O 3 , Strontium carbonate, calcium carbonate and titanium dioxide TiO 2 Weigh according to a certain proportion, mix by ball milling, and then dry, produce barium titanate BaTiO at 800 to 1200 degrees Celsius 3 , Bismuth titanate Bi 2 O 3 ·3TiO 2 , Strontium Titanate SrTiO 3 And calcium titanate CaTiO 3 .

[0009] Then according to a certain molar ratio: 43 to 44% barium titanate, 2 to 4% bismuth titanate, 38 to 39% strontium titanate and 14 to 15% calcium titanate. Ball mill drying, adding 8wt% polyvinyl alcohol for granulation, and sintering at 1220 degrees Celsius to obtain the lead-free high voltage capacitor material of the ceramic formulation.

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Abstract

The invention provides a barium titanate-based lead-free high-voltage ceramic capacitor material, which takes barium titanate, bismuth titanate, strontium titanate and calcium titanate as raw materials. After the materials are mixed, polyvinyl alcohol is added, the obtained mixture is pressed and formed, and the obtained product is sintered under about 1220 DEG C to obtain the high-pressure lead-free ceramic capacitor material. The voltage resistance of the capacitor material sintered by using the ceramic material formula is improved to 16.9kv / mm, the dielectric constant (Xir) is equal to 2089, and the dielectric loss (tan Delta) is equal to 0.0006 under 1MHz AC working current.

Description

Technical field [0001] The invention relates to a lead-free capacitor material, especially a high-voltage ceramic capacitor material. Background technique [0002] At present, the high-voltage ceramic capacitor materials widely used in production often contain a large amount of lead. Lead is a strong pollutant range element. It is non-degradable and can cause long-term and lasting damage to the human body and the environment. [0003] At the same time, the dielectric constant of lead-free ceramic capacitor materials of general formulations is small, which cannot meet the needs of miniaturization of electronic circuits, and the withstand voltage value is not high enough. Summary of the invention [0004] The invention provides a lead-free ceramic capacitor material with high voltage resistance and high dielectric constant. [0005] The technical solutions are as follows: [0006] A barium titanate-based lead-free high-voltage ceramic capacitor material is characterized by using barium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468
Inventor 钱云春
Owner 钱云春
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