Modified silicon oxide barrier coatings produced by microwave CV

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427237, 427238, 427534, 427536, 427563, 427575, 427579, 428 348, 428 352, 428 353, 428 355, 428 357, 428 3692, 428336, 428446, 428451, B32B 108

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056702248

ABSTRACT:
A method of depositing, by microwave plasma enhanced chemical vapor deposition, a modified, silicon oxide, barrier coating atop a temperature sensitive substrate; said barrier coating having barrier properties to at least gaseous oxygen and water vapor. The precursor gaseous mixture includes at least a silicon-hydrogen containing gas, an oxygen containing gas and a gas containing at least one element selected from the group consisting of germanium, tin, phosphorus, and boron. The method requires introducing a sufficient flow rate of oxygen-containing gas into the precursor gaseous mixture to eliminate the inclusion of silicon-hydrogen bonds into the deposited coating. The preferred modifier is germanium. Also, a composite material having a microwave-plasma-enhanced-chemical-vapor-deposited silicon oxide (modified or non-modified) barrier coating. The barrier coating has barrier properties to at least gaseous oxygen and water vapor and is substantially free of Si--H bonds. The barrier coating is deposited by the instant method on a temperature sensitive substrate.

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