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Invention Grant
US5045509A UV-transparent glass 失效
紫外线透明玻璃

UV-transparent glass
Abstract:
The invention relates to a glass which is transparent to UV radiation and which, for a thickness of 1 mm and the wavelength of 253.7 nm has a transmission of at least 75%, a linear coefficient of thermal expansion of 3.8.times.10.sup.-6 to 4.5.times.10.sup.-6 K.sup.-1 in the temperature range from 20.degree. to 300.degree. C. and a hydrolytic resistance of
Abstract(Chinese):

本发明涉及一种对UV辐射透明的玻璃，对于厚度为1mm，波长为253.7nm的玻璃具有至少75％的透射率，线性热膨胀系数为3.8×10 -6至4.5×10 6 -6K-1在20〜300℃的温度范围内，根据DIN 12 111的耐水解性<120μgNa2O / g。新玻璃的合成组成按氧化物计算为 -SiO2 64〜66.5重量％-B2O3 20〜22.5重量％-Al2O3 4〜6重量％-Li2O 0.4〜1重量％-Na2O 1.0〜3.5重量％K2O 1.0〜2.5重量％-CaO 0.35〜0.8重量％-BaO 0.5〜2.0重量％-F-0.5〜2.0重量％SIGMA Li2O + Na2O + K2O 3.8〜5.5重量％SIGMA CaO + BaO 1.0〜2.5重量％ - 酮或 更多0.2-2.0重量％ - 非氧化 - 精制剂 - 一个或多于0.05-0.3重量％。 减压剂 -

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