Heat reflecting pane and a method of producing it
First Claim
1. A heat-reflecting pane comprising:
- a substantially transparent glass substrate; and
two adjacent layers of TiO2 on said glass substrate comprising;
an intermediate layer of TiO2 on said glass substrate;
said intermediate layer of TiO2 being in the anatase form; and
an outside layer of TiO2 on said glass substrate;
said outside layer of TiO2 being in the rutile form;
said adjacent layers having been formed by first depositing an intermediate Ti layer to said glass substrate by vapor deposition in vacuo followed by depositing an outside Ti layer to said intermediate layer of Ti by vapor deposition in vacuo and subsequently oxidizing said intermediate and outside Ti layers at a temperature of at least 400°
C.
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Abstract
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° C. to form TiO2. The intermediate layer of TiO2 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.
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Citations
13 Claims
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1. A heat-reflecting pane comprising:
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a substantially transparent glass substrate; and two adjacent layers of TiO2 on said glass substrate comprising; an intermediate layer of TiO2 on said glass substrate; said intermediate layer of TiO2 being in the anatase form; and an outside layer of TiO2 on said glass substrate; said outside layer of TiO2 being in the rutile form; said adjacent layers having been formed by first depositing an intermediate Ti layer to said glass substrate by vapor deposition in vacuo followed by depositing an outside Ti layer to said intermediate layer of Ti by vapor deposition in vacuo and subsequently oxidizing said intermediate and outside Ti layers at a temperature of at least 400°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing a heat-reflecting pane comprising:
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providing a substantially transparent glass substrate; applying an intermediate Ti layer to the side of said glass substrate by vapor deposition in vacuo, using a pressure of approximately 10-4 Torr in order to obtain the anatase form of TiO2 ; applying an outside Ti layer to the previously formed Ti layer by vapor deposition in vacuo, using a pressure of at least 10-5 Torr in order to obtain the rutile form of TiO2 ; subsequently heating the pane in air to a temperature of at least 550°
C. in order to oxidize both Ti layers to form two layers of TiO2, the outside Ti layer being in the rutile form with the intermediate layer being in the anatese form; andsubsequently cooling the pane. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification