METHOD OF PREPARING CARRIER MATERIALS FOR OPTICAL SENSORS

Bodies of borosilicate glass with a B2O3 content of less than 13 percent by weight are provided with a microporous layer of a thickness of 5 to 20 mu m, and are thus turned into carriers for optical sensors. This process is characterized by the following steps. Thermal decomposition for 5 to 10 days...

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Bibliographische Detailangaben
Hauptverfasser:	OFFENBACHER, HELMUT, KRONEIS, HERBERT. DR
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES JOINING GLASS TO GLASS OR OTHER MATERIALS MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES MEASURING METALLURGY MINERAL OR SLAG WOOL PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TESTING
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Beschreibung
Zusammenfassung:	Bodies of borosilicate glass with a B2O3 content of less than 13 percent by weight are provided with a microporous layer of a thickness of 5 to 20 mu m, and are thus turned into carriers for optical sensors. This process is characterized by the following steps. Thermal decomposition for 5 to 10 days at 500 DEG to 560 DEG C.; removal of the topmost layer of glass to a depth of at least 10 mu m in the part of the surface to be rendered porous; leaching of the separated borate phase with diluted mineral acids for a minimum of 2 days at 70 DEG to 98 DEG C.; and after-treatment of the microporous layer, including (a) chemical treatment with concentrated sulphuric acid and concentrated nitric acid for 2 hours at 20 DEG C., and (b) heat-treatment for 10 minutes to 2 hours at 450 DEG to 700 DEG C.