Selective Optical Coatings on Plastic Sheet
Transparent conducting oxide films have been produced by the vacuum process of reactive ion plating onto glass and plastic substrates at room temperature. These films have properties suited for the production of visibly transmitting, infra-red reflecting surfaces needed for a heat mirror which suppresses the radiative loss of heat in a window system. Optimum properties were achieved with careful control of the gas mixture and amount of substrate bias acquired by the substrate from the radio frequency used for the discharge. The oxides giving satisfactory properties include those of indium, indium doped with tin, indium doped with fluorine and cadmium/tin.
Heat mirrors have also been made from very thin film sandwiches of metals in various dielectrics.
Tests of the thermal performance of one square meter windows with simulated heat mirror systems have shown that an improvement in the performance of a double glazed unit can be obtained so that it is close to that of a cavity brick wall.
An economic assessment of the potentialities of a roll coating method of producing heat mirrors on the oxide system which has been created, suggests that a payback period of about three average months could be obtained in terms of manufacturing costs.
KeywordsTitanium Europe Argon Cadmium Fluorine
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