Quartz glass with reduced ultraviolet radiation transmissivity, and
electrical discharge lamp using such glass
    78.
    发明授权
    Quartz glass with reduced ultraviolet radiation transmissivity, and electrical discharge lamp using such glass 失效
    具有降低的紫外线透射率的石英玻璃和使用这种玻璃的放电灯

    公开(公告)号:US5572091A

    公开(公告)日:1996-11-05

    申请号:US442831

    申请日:1995-05-17

    Abstract: Ultraviolet (UV) radiation in the UV-C and UV-B bands, which is particularly dangerous, is absorbed and filtered by quartz glass doped with between 0.065% and 3.25%, and preferably between 0.065% and 1.3% by weight, of cerium metal, or cerium as such. Preferably, the cerium is added to quartz sand and/or rock crystal, in form of a fine-grained powder of up to 2 0 .mu.m grain size, in form of cerium aluminate (CeAlO.sub.3), present in up to about 5% by weight, and preferably up to about 2%, and melted together in a single step. The quartz glass so obtained is particularly suitable for a metal halide discharge lamp, e.g. as an outer envelope (1), or as the discharge vessel (27) itself, or for halogen incandescent lamps, to form the quartz-glass light bulb or an envelope therefor. A small quantity of titanium oxide, up to about 0.05%, may be added as a further doping agent to the melt to further improve the UV absorption in the B and C bands.

    Abstract translation: 特别危险的UV-C和UV-B带中的紫外线(UV)辐射被掺入0.065%至3.25%,优选0.065%至1.3%重量的铈的石英玻璃吸收和过滤 金属或铈。 优选地,将铈以石灰砂和/或岩石晶体的形式加入石英砂和/或岩石晶体,其形式为以铝酸铈(CeAlO 3)的形式存在的至多约0%的晶粒尺寸的细粒粉末,其以至多约5%的比例存在, 重量,优选高达约2%,并在一个步骤中熔融在一起。 如此获得的石英玻璃特别适用于金属卤化物放电灯,例如, 作为外封套(1),或作为放电容器(27)本身,或用于卤素白炽灯,以形成石英玻璃灯泡或其封套。 可以将少量至多约0.05%的氧化钛作为另外的掺杂剂加入到熔体中以进一步提高B和C带中的UV吸收。

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