Low-loss high-voltage ceramic capacitor dielectric

Abstract

The invention relates to the technical field of inorganic nonmetallic materials, in particular to a low-loss high-voltage ceramic capacitor dielectric. By adopting a conventional ceramic capacitor dielectric preparation method and using common chemical raw materials for capacitor ceramic, a lead-free and cadmium-free low-loss high-voltage ceramic capacitor dielectric is prepared and the sintering temperature of the capacitor ceramic can be reduced. The dielectric is suitable for preparing monolithic ceramic capacitors or chip multi-layer ceramic capacitors, the cost of the ceramic capacitors can be greatly reduced, the withstand voltage can be improved and the losses can be reduced to expand the application scope of the ceramic capacitors, the safety of the ceramic capacitors can be greatly improved and the environment is not polluted during preparation and use at the same time.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a low-loss high-voltage ceramic capacitor medium; it adopts a conventional ceramic capacitor medium preparation method and utilizes common chemical raw materials of capacitor ceramics to prepare lead-free and cadmium-free low-loss high-voltage ceramics Capacitor medium can also reduce the sintering temperature of capacitor ceramics. This medium is suitable for the preparation of monolithic ceramic capacitors and multilayer ceramic capacitors. It can greatly reduce the cost of ceramic capacitors, and at the same time can increase the withstand voltage and reduce losses to expand ceramic capacitors. The application range, and can greatly improve the safety of ceramic capacitors, while not polluting the environment in the process of preparation and use. Background technique [0002] Color TVs, computers, communications, aerospace, missiles, navigation and ot...

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Problems solved by technology

[0008] Another patent is "high dielectric high performance medium temperature sintered chip multilayer ceramic capacitor ceramic material" (patent application number: 97117286.2), which is synthesized by solid phase method and simultaneously replaced by equivalent and heterovalent ions (Sr 2+ ,Zr 4+ ,Sn 4+ ,Nb 5+ ) BaTiO 3 Solid solution, add an appropriate amount of boron-lead-zinc-copper glass sintering agent to sinter the ceramic material at medium temperature. Its properties are: dielectric constant greater than or equal to 16000, and withstand voltage of 700V / mm. Although the patent has a high dielectric constant, the reported The withstand voltage of the material is too poor, only 700V / mm, and its components contain a certain amount of lead

[0009] There is another patent "Manufacturing Method of High Voltage Ceramic Capacitor Dielectric" (Patent No. 91101958.8), which uses an unconventional process to prepare the dielectric, that is, a tape-cast film, and then laminates the dielectric body. The disadvantage of this patent is that the preparation process is complicated, which leads to an increase in product manufacturing cost

[0010] There is also the Chinese patent "High-performance Medium-temperature Sintered Chip Multilayer Ceramic Capacitor Porcelain Material" (patent application number: 97117287.0), which uses a unique formula (weight percentage) (BaTiO 3 93~96%+Nb 2 o 5 0.8~1.5%+Bi 2 o 3 1.0~2.2%+fluxing agent 1.8~3.5%+modifier 0.25~1.0%) to obtain capacitor ceramics sintered at medium temperature that meet the following properties: dielectric constant is 3000, dielectric loss is less than 1.5%, and withstand voltage is 860V / mm; The flux of this patent contains a certain amount of lead, the withstand voltage of this patent is too poor, and the dielectric loss is too large at the same time, which is much greater than that of this patent

[0011] There is also a Chinese patent "a medium-low temperature sintered high-voltage ceramic capacitor dielectric" (patent application number: 200410041863.x), which uses a unique formula (weight percentage) (BaTiO 3 60-90%, SrTiO 3 1-20% CaZrO 3 0.1-10%,Nb 2 o 5 0.01-1%, MgO0.01-1%, CeO 2 0.01-0.8%, ZnO0.01-0.6%, Co 2 o 3 0.03-1%, bismuth-lithium solid solution 0.05-10%) to obtain capacitor ceramics that meet the following properties after medium-temperature sintering: the dielectric constant is 2000~3000, the withstand voltage is above 6kV / mm, and the additive to reduce the sintering temperature is bismuth-lithium solid solution , the dielectric loss of the patent is too high

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