The invention relates to a dual-concave high-
voltage ceramic capacitor and a manufacturing process thereof. A
ceramic dielectric substrate of the
capacitor is shaped like a cylinder, two truncated cone-shaped gaps are formed in the cylinder, and then two concave portions are formed, that is to say, the thickness of the edge of the
ceramic substrate is greater than that of the center. A transition surface with an arc line being the cross section is arranged between a round surface in the center of the
ceramic substrate and a concave inclined surface of a truncated cone-shaped side surface. The
ceramic substrate is provided with an
electrode. The
electrode is divided into three
layers, wherein the top layer is
tin alloy. The
electrode is welded to a lead wire.
Epoxy resin wraps the substrate, the electrode and part of the lead wire. The manufacturing process of the
capacitor includes
ceramic substrate manufacturing, electric polarization, lead wire
welding,
coating, printing, and testing. The electrode of the capacitor is manufactured through magnetron
sputtering, and can be freely controlled in size. Through the design of the transition surface in the substrate concave parts, point
discharge risks of the electrode are reduced, the over-
voltage resistance of the capacitor is further improved, and the capacitor can become miniature. Through the design of a
copper-
tin alloy layer, the electrode can still be welded if part of the electrode is oxidized.