Process for obtaining insulating ceramic inserts by multilayer stacking

A product produced by a process for manufacturing an insulating ceramic insert, said product comprising a ceramic body defined by two non-metallized end faces, an external lateral surface of any shape and at least one bore joining said two end faces, wherein said process comprises:

• casting at least two plane sheets from a lip of insulating ceramic powder to obtain at least two green sheets,
• printing ring-shaped patterns, by silk-screening, on at least one face of one of said green sheets with the aid of a conducting metallization ink or paste,
• performing a pressing operation on the silk-screen printed sheet,
• performing a punching operation on all said sheets to obtain a number of holes, each of said holes of said silk-screen printed sheet matching the interior of a ring of said ring-shaped patterns and having a diameter less than that of holes of the other sheets, stacking said sheets by bringing into coincidence the axes of the various holes, thereby obtaining said at least one bore,
• performing a pressing operation to agglomerate said sheets,
• performing a cutting-out operation around said at least one bore to obtain said external lateral surface and thereby fabricating at least one green insert,
• performing a heat treatment to fire and sinter said insert,
• metallizing said sintered insert over its external lateral surface, and
• performing a lapping operation to remove the metallization from the end faces.