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    Opaque silica glass article having transparent portion and process for producing same
    3.
    发明公开
    Opaque silica glass article having transparent portion and process for producing same 有权
    不透明石英玻璃制品具有透明区域和过程及其制备

    公开(公告)号：EP0909743A1

    公开(公告)日：1999-04-21

    申请号：EP98119541.5

    申请日：1998-10-15

    申请人： Tosoh Corporation ,  NIPPON SILICA GLASS CO., LTD.,

    发明人： Nagata, Hiroya ,  Kudo, Masayuki, 206, Tosoh Corporation Machida-Ryo ,  Tsukuma, Koji ,  Kikuchi, Yoshikazu ,  Akiyama, Tomoyuki

    IPC分类号： C03C3/06 ,  C03C11/00

    CPC分类号： C03B19/09 ,  C03C3/06 ,  C03C11/007 ,  C03C2201/24 ,  C03C2201/80 ,  C03C2203/10 ,  Y10S65/08 ,  Y10T428/1317 ,  Y10T428/249969

    摘要： An opaque silica glass article comprising a transparent portion and an opaque portion, wherein the opaque portion has an apparent density of 1.70 - 2.15 g/cm 3 and contains 5 x 10 4 - 5 x 10 6 bubbles per cm 3 , said bubbles having an average diameter of 10 - 100 µm; and the transparent portion has an apparent density of 2.19 - 2.21 g/cm 3 and the amount of bubbles having a diameter of at least 100 µm in the transparent portion is not more than 1 x 10 3 per cm 3 .
    The opaque silica glass article is made by a process wherein a mold is charged with a raw material for forming the opaque portion, which is a mixture comprising a silica powder with a small amount of a silicon nitride powder, and a raw material for forming the transparent portion so that the two raw materials are located in the positions corresponding to the opaque and the transparent portions, respectively, of the silica glass article to be produced; and the raw materials are heated in vacuo to be thereby vitrified.

    摘要翻译： 不透明石英玻璃制品，其包括和不透明部分的透明部分，worin不透明部分具有在1.70表观密度 - 2.15克/厘米<3>和含有5×10 <4> - 每平方厘米5×10 <6>气泡 <3>，。所述气泡具有在10至100微米平均直径; 和透光部分具有至2:21的2:19表观密度克/厘米<3>和具有透明部分的直径的至少100微米的气泡的量不大于1×10 <3>每厘米多个<3 >。 不透明石英玻璃制品是由worin的模具中装入的原料用于形成遮光部的方法，所有这些是包括具有氮化硅粉末的少量的二氧化硅粉末的混合物，和一个原料用于形成由 透明部分，以便做了两种原料都位于位置分别对应于不透明和透明部分，该石英玻璃制品要生产的; 和原材料是在真空中加热从而被玻璃化。