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

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...

AI Technical Summary

Problems solved by technology

[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.