Reducing melt borosilicate glass having improved UV transmission properties and water resistance and methods of use
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/091
C03C-004/08
출원번호
US-0319969
(1994-10-07)
우선권정보
DE-4335204 (1993-10-15)
발명자
/ 주소
Watzke Eckhart (Jena DEX) Kloss Thomas (Jena DEX) Brix Peter (Mainz DEX) Ott Franz (Mitterteich DEX)
출원인 / 주소
Schott Glaswerke (Mainz DEX 03)
인용정보
피인용 횟수 :
12인용 특허 :
6
초록▼
Reducing melt borosilicate glass having a UV transmittance of at least 85% for ultraviolet radiation having a wavelength of 254 nm for a sample thickness of 1 mm and a water-resistance of less than 100 micrograms, advantageously less than 62 micrograms, Na2O per gram of glass powder according to ISO
Reducing melt borosilicate glass having a UV transmittance of at least 85% for ultraviolet radiation having a wavelength of 254 nm for a sample thickness of 1 mm and a water-resistance of less than 100 micrograms, advantageously less than 62 micrograms, Na2O per gram of glass powder according to ISO 719 and a thermal expansion coefficient a20/300 of from 5 to 6×10-6K-1 and comprising from 58 to 65% by weight SiO2, from 18 to 20.5% by weight B2O3, from 8.1 to 10.4% by weight Al2O3, from 0 to 1% by weight CaO, from 0 to 2% by weight BaO, from 0 to 2% by weight SrO, from 0 to 1.5% by weight Li2O, from 5.5 to 8.5% by weight Na2O, from 0 to 3% by weight K2O and from 0 to 2% by weight fluorine. The sum total content of all of the alkali metal oxides present in the glass is not greater than 10% and the sum total content of the CaO, BaO and SrO is not greater than 3% and the molar ratio of Al2O3: Na2O is from 0.6 to 1. The glass is particularly suitable for EPROM windows, UV lamps, photomultipliers, spectrophotometers under difficult climatic conditions and protective tubes for UV lamps immersed in water in waste water treatment operations.
대표청구항▼
A borosilicate glass made by melting under reducing conditions and having a UV transmittance of at least 85% for ultraviolet radiation having a wavelength of 254 nm for a layer thickness of 1 mm of said glass, a water-resistance of less than 100 micrograms Na2O per gram of glass powder according to
A borosilicate glass made by melting under reducing conditions and having a UV transmittance of at least 85% for ultraviolet radiation having a wavelength of 254 nm for a layer thickness of 1 mm of said glass, a water-resistance of less than 100 micrograms Na2O per gram of glass powder according to ISO 719 and a thermal expansion coefficient a20/300 of from 5 to 6×10-6K-1 and comprising from 58 to 65% by weight SiO2, from 18 to 20.5% by weight B2O3, from 8.1 to 10.4% by weight Al2O3, from 0 to 1% by weight CaO, from 0 to 2% by weight BaO, from 0 to 2% by weight SrO, from 0 to 1.5% by weight Li2O, from 5.5 to 8.5% by weight Na2O, from 0 to 3% by weight K2O, from 0 to 2% by weight fluorine, up to 10 ppm of iron oxides including iron (III) oxide and a sufficient amount of a reducing agent to maintain the iron (III) oxide concentration less than 2 ppm, and wherein a sum total content of all of alkali metal oxides present including said Li2O, said Na2O and said K2O is not-greater than 10%, a sum total content of said CaO, said BaO and said SrO is not greater than 3% all values of said % by weight are on an oxide basis and a molar ratio of Al2O3:Na2O is from 0.6 to 1.
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이 특허에 인용된 특허 (6)
Nagai Hiroki (Osaka JPX) Yamamoto Shigeru (Kyoto JPX), Alumina package for hermetically containing an electronic device therein.
Watzke Eckhart,DEX ; Kampfer Andrea,DEX ; Brix Peter,DEX ; Ott Franz,DEX, Borosilicate glass of high chemical resistance and low viscosity which contains zirconium oxide and lithium oxide.
Fechner, Joerg Hinrich; Ott, Franz, Solarization-resistant glass composition having a UV-cutoff with a definite transmittance gradient and radiating device for a weathering apparatus containing a glass of said composition.
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