Temperature compensating capacitor dielectric with linear change rate of capacity and temperature and preparation method of temperature compensating capacitor dielectric

Abstract

A temperature compensating capacitor dielectric with linear change rate of capacity and temperature comprises 100 parts of barium titanate by weight as the base material and adds the following components: 1.45-12.5wt% of nickel niobium oxide (NiNb2O6), 5-20wt% of zirconia, 0-0.2wt% of manganese carbonate, 0.025-0.2 mol% of rare earth oxide and 3-10wt% of Zn-B-Ba-Si glass. According to the invention, the dielectric constant of the capacitor dielectric and the change relationship of capacity and temperature are regulated by mainly changing the volume of addition of NiNb2O6 and zirconia so as to be in linear relationship and to be used for the temperature compensating capacitor dielectric. The capacitor dielectric can be made into the MLCC (Multiplayer Ceramic Chip Capacitors) dielectric used under pulse power. In addition, the capacitor dielectric has the benefits of low loss, medium-temperature sintering and the like.

Description

technical field [0001] The invention relates to a temperature-compensated capacitor medium with a linear capacitance-temperature change rate and a preparation method thereof. Background technique [0002] Temperature-compensated capacitor dielectric, within the range of -55 to 125°C, its capacity-temperature variation relationship is linear, and has a very low dielectric loss. According to the EIA-98 standard, the quality factor Q of temperature-compensated capacitors or dielectrics ≥1000, that is, the dielectric loss is required to be ≤10 -4 . Therefore, in a high-frequency and high-voltage environment, it is not easy to generate heat and has high impact resistance. It can also be called a high-frequency ceramic capacitor, so it can be used as a pulse power MLCC. Development has far-reaching implications. [0003] At present, typical temperature compensation dielectric materials include magnesium zinc titanate-calcium titanate, magnesium zinc zirconate-calcium titanate, ...

AI Technical Summary

Problems solved by technology

However, in order to achieve higher volume density, quality factor Q and breakdown voltage, these materials often have higher sintering temperature, need to use more noble metal inner electrodes, or have low-temperature co-firing process, such as materials prepared by chemical methods need special sintering Equipment and large-scale costs are higher, so developing a material system that can meet the performance of temperature-compensated materials and realize medium-temperature sintering will have important economic and social benefits

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