Graded index antireflective coatings for glass : final report, September 1978 - February 1982
Author(s)
Haggerty, John Scarseth
DownloadEL_TR_1982_016.pdf (11.02Mb)
Alternative title
Antireflective coatings for glass , Graded index.
Metadata
Show full item recordAbstract
Glass compositions and process conditions by which broad band gradedindex antreflective films can be produced on glass surfaces have been developed. The end use for the treated glass sheet is as cover plates for flat plate solar-thermal collectors; thus, cost issues dictated that the process conditions fall within constraints imposed by the float glass process. To accomplish this objective, both the film formation process and the characteristics of the graded-index films were investigated in detail. A model, borosilicate glass was used for initial work that served to verify experimental procedures, to confirm essential features of the film forming process and to determine whether the porous surface film and the phase separated structure of the host glass had an adverse effect on mechanical properties. Glasses and film surfaces were characterized chemically (atomic absorption, Auger and SIMS), microstructurally (SEM, TEM and replica microscopy), by weight loss, by specific surface area (BET), by small angle X-ray scattering (SAXS) and optically. Based on the results with the borosilicate glass, a candidate soda-limesilica glass composition was defined that satisfied the phase separation and float glass process criteria. Heat treatments were defined for the glass that produced appropriate microstructures and selective etchants were defined that produced porous films by selective dissolution.
Date issued
1983Publisher
Cambridge, Mass. : Massachusetts Institute of Technology, Energy Laboratory, 1983
Series/Report no.
Energy Laboratory report (Massachusetts Institute of Technology. Energy Laboratory) no. MIT-EL 82-016.