A kind of nano ceramic material composition and standard capacitor and preparation method thereof

Abstract

The invention provides a nano ceramic material composition, and a preparation method thereof. The nano ceramic material composition comprises a nano ceramic material, a nanometer substance additive, and a glass frit sintering aid; the nanometer substance additive comprises at least one ingredient selected from Sm2O3, CeO2, Nd2O3, BiO2, SiO2, MnCO3, and MnO2. The invention also provides a standard capacitor, and a preparation method thereof. The nano ceramic material composition is taken as a medium of the standard capacitor. The standard capacitor prepared by taking the nano ceramic material composition as the medium is high in accurate, low in loss factor, wide in capacity range, and high in stability and reliability.

Description

technical field [0001] The invention relates to the technical field of precision electromagnetic measurement, more specifically, to a nano ceramic material composition, a standard capacitor and their preparation methods. Background technique [0002] The standard capacitors currently used in the market mainly include: quartz standard capacitors, air standard capacitors, mica standard capacitors, etc. [0003] Quartz standard capacitors have the advantages of high stability and small thermal expansion coefficient; however, the dielectric constant of quartz is small, and the capacity of standard devices made of it is generally less than 100pF. Therefore, quartz capacitors cannot meet the use requirements of a wide capacity range. The standard capacitor with air or nitrogen as the medium has the advantages of small loss factor and good stability; but its effective electrode area and the distance between electrodes are connected and supported by metal parts, the mechanical struc...

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Problems solved by technology

[0003] Quartz standard capacitors have the advantages of high stability and small thermal expansion coefficient; however, the dielectric constant of quartz is small, and the capacity of standard devices made of it is generally less than 100pF. Therefore, quartz capacitors cannot meet the use requirements of a wide capacity range.

The standard capacitor with air or nitrogen as the medium has the advantages of small loss factor and good stability; but its effective electrode area and the distance between electrodes are connected and supported by metal parts, the mechanical structure is more complicated, and the air or nitrogen The dielectric constant is small, and the capacity range is relatively narrow, generally 1pF ~ 1000pF

Mica is used as a standard capacitor as a dielectric material, with excellent mechanical and electrical properties, and a loss factor of 10 -4 Order of magnitude, capacity range 10nF~1μF; However, due to the high impurity content of natural mica, when the electrode is sintered after silver plating, the process is not easy to control, and its accuracy level is low

[0004] At present, in the precision measurement of impedance and the transfer of capacitance value in our country, many scientific research institutes and testing institutions purchase standard capacitors produced at home and abroad, all of which have problems such as low accuracy level, large loss factor, and narrow capacity range, which cannot meet my country's requirements. Demand for High Accuracy, High Quality Standard Capacitors

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