Why can't ceramic capacitors be used in AC?

Some users have suggested that the withstand voltage marked by ceramic capacitors refers to DC withstand voltage. Is capacitance useful for DC? Are ceramic capacitors not components that work in AC circuits? This article is to explain the reasons for this issue, I hope that the content of this article can help everyone!

The ceramic capacitors are high-k capacitor ceramics (Barium Titanate - Titanium Dioxide) extruded into a circular tube, a disk or a disk as a medium, and plated with silver on the ceramic as an electrode by infiltration. It is divided into high frequency porcelain and low frequency porcelain. A capacitor with a positive temperature coefficient of capacitance is used in a high-stability oscillator circuit as a loop capacitor and a pad capacitor.

1) The capacitor withstand voltage parameter generally refers to the large voltage that can be allowed under the limited leakage current parameter. In actual test, it is easier to measure with DC voltage. Because the capacitor itself can pass the alternating current, it will drown the leakage current;

2) The dielectric in the capacitor is generally able to withstand a lower voltage than the AC voltage under DC voltage. This involves the material characteristics, and it is reasonable to use the DC withstand voltage as the rated parameter.