Doped modified SrTiO3-based high-pressure ceramic capacitor material with negative temperature coefficient

A technology of high-voltage ceramics and ceramic capacitors, which is applied in the direction of fixed capacitor dielectric and fixed capacitor components, and can solve the problems of large temperature changes in capacity

Inactive Publication Date: 2011-07-06
费金华
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Problems solved by technology

[0002] Most of the current high-voltage capacitors have an operating temperature range of -30°C to 65°C, but

Method used

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Embodiment Construction

[0006] In specific implementation, we use strontium titanate SrTiO 3 , copper oxide CuO, zinc dioxide ZnO 2 , manganese dioxide MnO 2 , Niobium pentoxide Nb 2 o 5 , Magnesium titanate MgTiO 3 After mixing according to the formula ratio, polyvinyl alcohol is added to press molding, and then sintered in the range of 1250 to 1400 degrees Celsius to obtain a ceramic capacitor.

[0007] When proportioning, we first mix strontium carbonate SrCO 3 and titanium dioxide TiO 2 , magnesium carbonate MgCO 3 and titanium dioxide TiO 2 According to a certain ratio, it is mixed by ball milling, dried, and then synthesized at 1000 to 1200 degrees Celsius to obtain strontium titanate SrTiO 3 , Magnesium titanate MgTiO 3 ; In obtaining strontium titanate SrTiO 3 , Magnesium titanate MgTiO 3 Finally, the rest of the above materials are stirred and ball milled according to the ratio, diluted with a small amount of acetone, stirred at a high speed (7000r / min) for 20min, to fully dispers...

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Abstract

The invention provides a doped modified ceramic capacitor material for equalizing the voltages of a zinc oxide arrester, in particular to a high-pressure ceramic capacitor material prepared from 80-84 percent of SrTiO3, 8-10 percent of BiO8, 0.5-2 percent of TiO2, 0.1-1 percent of MnO2, 4-8 percent of YO4 and 3-5 percent of MgTiO3. By adopting the formula, solid volume limit in SrTiO3 crystal lattices can be increased, a strong peak shifting and broadening action is generated, and the capacitor temperature characteristics are improved. Meanwhile, the electric constant is increased to 2500, the dielectric loss is smaller than 0.0001, the change rate of the high-temperature stability capacity along with temperature is smaller than 10 percent, and the lightning-protection and voltage-equalizing actions are excellent.

Description

technical field [0001] The invention relates to a capacitor material, especially a high-voltage ceramic capacitor material. Background technique [0002] Most of the current high-voltage capacitors have an operating temperature range of -30°C to 65°C, but they cannot be used in polar or space environments, and the capacity will increase with temperature changes. Contents of the invention [0003] The object of the present invention is to provide a high-voltage ceramic capacitor material with strong stability. [0004] A doping-modified negative temperature coefficient strontium titanate-based high-voltage ceramic capacitor material, characterized in that it is made of strontium titanate SrTiO 3 80~84%, copper oxide CuO8-10%, zinc dioxide ZnO 2 0.5-2%, manganese dioxide MnO 2 0.1-1%, niobium pentoxide Nb 2 o 5 4-8%, magnesium titanate MgTiO 3 3-5% composition of high voltage ceramic capacitor materials. [0005] By adopting the formula, the dielectric constant of the...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/622H01G4/12
Inventor 费金华
Owner 费金华
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