METHOD OF AND DEVICE FOR COATING THE INSIDE OF TUBES

摘要

12 Method of and device for coating the inside of tubes. For coating the inside of a tube of an electrically insulating material with a second electrically insulating material by reactive deposition of the second electrically insulating material from a gas mixture which is passed through the tube, in which the tube is heated and the deposition is activated by a plasma produced by microwaves and reciprocating in the tube, a low energy consumption is achieved in that the tube is heated and kept at the reaction temperature at least partly by the energy supplied by the plasma to the tube wall, in that the thermal losses of the tube to the ambient are reflected back to the tube wall by a heat reflecting element. Fig. 1.