MANUFACTURED ARTICLES IN SILICON OXIDE AND/OR OTHER MIXED METALLIC OXIDES AND PROCESS FOR THEIR PREPARATION IN FINAL OR ALMOST FINALDIMENSIONS

摘要

Optical components are described, in silicon oxide and/or other mixed metallic oxides having dimensional precision which has a tolerance of surface roughness and profilometric accuracy within the specifications described for visible and ultraviolet spectrum ranges. The above manufactured articles have "final" or "almost final" dimensions as they are obtained by the isotropic dimensional reduction (miniaturization) of amorphous monolithic materials, called aerogels, which are in turn prepared by cold moulding techniques based on sol-gel processes. These objects are particularly used as accessories for thermal treatment in the electronic or ceramic industries and/or as optical components and devices.