Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1983-06-29
1985-08-13
Lesmes, George F.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
156625, 156644, 156662, 350165, 427165, 4273722, 4273742, 427377, 427379, 4273977, 4283126, 428333, 428428, C03C 1500
Patent
active
045350264
ABSTRACT:
Antireflective silica coating for vitreous material is substantially non-reflecting over a wide band of radiations. This is achieved by providing the coating with a graded degree of porosity which grades the index of refraction between that of air and the vitreous material of the substrate. To prepare the coating, there is first prepared a silicon-alkoxide-based coating solution of particular polymer structure produced by a controlled proportion of water to alkoxide and a controlled concentration of alkoxide to solution, along with a small amount of catalyst. The primary solvent is alcohol and the solution is polymerized and hydrolized under controlled conditions prior to use. The prepared solution is applied as a film to the vitreous substrate and rapidly dried. It is thereafter heated under controlled conditions to volatilize the hydroxyl radicals and organics therefrom and then to produce a suitable pore morphology in the residual porous silica layer. The silica layer is then etched in order to enlarge the pores in a graded fashion, with the largest of the pores remaining being sufficiently small that radiations to be passed through the substrate are not significantly scattered. For use with quartz substrates, extremely durable coatings which display only 0.1% reflectivity have been prepared.
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Partlow Deborah P.
Yoldas Bulent E.
Lesmes George F.
Palmer W. D.
Schwartz P. R.
The United States of America as represented by the United States
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