Ceramic dielectric capacitors use mainly ceramic as the insulator material, and their basic construction is to overlap ceramic and internal electrodes. There are several types of ceramic materials. Since the consideration of harmless electronic products, especially lead-free, PB (lead) with high dielectric coefficient has been withdrawn from the field of ceramic capacitors, and TiO2 (titanium dioxide), BaTiO3, CaZrO3 (calcium zirconate), etc. are mainly used now. Compared with other capacitors, they have the advantages of small size, large capacity, good heat resistance, suitable for mass production, low price, etc.
In 1900, L. Lombardi invented ceramic dielectric capacitors in Italy, and at the end of the 1930s, people found that adding titanate to ceramics could increase the dielectric constant exponentially, thus making cheaper porcelain dielectric capacitors.
After the discovery of the insulating properties of BaTiO3 (barium titanate), the main raw material of ceramic capacitors, around 1940, ceramic capacitors began to be used in military electronic equipment, which required high precision and small size. The development of ceramic stacked capacitors began around 1960 as a commercial product. By 1970, with the advancement of hybrid ICs, computers, and portable electronic devices, they also developed rapidly and became an indispensable component of electronic devices. Nowadays, ceramic dielectric capacitors account for about 70% of the total capacitor market.
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