Method for the production of coated glass with a high transmissivity in the visible spectral range and with a high reflectivity for thermal radiation

DETAILED DESCRIPTION This object is achieved according to the invention by the fact that, for the second and fourth layer, an alloy of about 80 weight-percent of nickel and about 20 weight-percent of chromium is used, the substrate with the entire series of coatings being heated at least to the softening temperature of the glass, being plastically deformed in the heated state, and cooled in the deformed state.
Preferably the second and fourth layer are applied in a thickness which results in a greater absorption in the visible range than is desired in the final state, the heat treatment being performed in an oxidizing atmosphere until the average transmission in the visible range has increased above the transmission prior to the heat treatment by at least 5%, preferably by at least 8%.
By selecting the thickness of layers two, three and four it is desirable to set the maximum transmissivity in the visible range before the heat treatment at 70 to 80% and to raise it by the heat treatment to 80-87%.
Advantageously, the thickness of the third layer (silver) is established such that, after the heat treatment, a surface resistance between 2 and 10 ohms per square will result.