Bfg Glassgroup

Rolf Groth

A heat-reflecting panel having a neutral-color outer appearance has a transparent film support, such as a glass pane, an interference film having a refractive index &gt;2 disposed on the support, a heat reflecting gold film of a thickness of 70-105 A disposed on the side of the interference film remote from the support, and neutralization film formed from chromium, iron, nickel, titanium or alloys thereof, or an alloy of chromium, aluminium and iron, the neutralization film disposed on the side of the gold film remote from the interference film.

Heat-reflecting panel having neutral-color outer appearance

A heat-reflecting pane consists of a substantially transparent glass substrate with two layers of titanium oxide, the outside layer being in the rutile form with the intermediate layer being in the anatase form. The pane is formed by double coating the glass substrate with layers of titanium applied by vacuum deposition. A weaker vacuum is used to obtain the anatase form with a stronger vacuum used to obtain the rutile form. Both layers are then oxidized at temperatures of at least 550.degree. C. to form TiO.sub.2. The intermediate layer of TiO.sub.2 in the anatase form prevents the rutile layer from becoming opaque when the pane is heated to the temperature necessary for heat treatment of the glass substrate. The treatment may be effected either during the heating step in which the titanium is oxidized or in a subsequent additional heating step.

Heat reflecting pane and a method of producing it

A heat reflecting pane comprises a substantially transparent glass substrate which has a layer of silicon oxide thereon and a layer of titanium dioxide in the rutile form on the side of the silicon oxide layer remote from the glass pane, the glass substrate having been toughened by heat treatment. The pane is formed by coating the glass substrate with a thin layer of silicon oxide, then applying a layer of titanium to the silicon oxide layer by vacuum deposition, the oxidizing the titanium at over 550.degree. C. to form titanium oxide in the rutile form. The silicon oxide layer prevents the rutile layer from becoming opaque when the pane is heated to the temperature necessary for heat treatment of the glass substrate, which may be during the heating step in which the titanium is oxidized or may be subsequently.

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Bochum-Wattenscheid, Germany

Rolf Groth