A process for the preparation of a strongly adhering, electrically conductive and solderable metallic coating on non-metallic solid traeger bodies, such as, for example, glass or ceramic, by vapor deposition

摘要

Firmly adhering electrically conductive solderable metallic coatings are produced on non-metals by vapour deposition. On a solid non-metallic carrier body (such as glass, ceramics, porcelain or an oxidic sintered body) heated to at least 200 DEG C a first layer of one or more of the metals Fe, Cr. Sn and In is deposited in an oxidising atmosphere from the vapour phase at a vacuum of 10-3 mm. Hg or less (e.g. 10-4 mm. Hg), whereafter a second layer of Ag or Cu and a third layer of solder are deposited in succession from the vapour phase (e.g. at 10-6 mm. Hg). The solder may be of Sn or Ag. The first layer may be so thin as to be permeable to light and the second and third layers may each be of 1 micron. In one example, glass is coated with 1) Fe, 2) Cu and 3) Sn and Cu wires are subsequently soldered to it. In another example, a porcelain tube is coated by the method of the invention and soldered to a metal flange to provide a vacuum tight connection.