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发明授权
US06451720B1 Glass composition, and information recording medium substrate, information recording medium, and information recording device each comprising the composition 有权
玻璃组合物，信息记录介质基材，信息记录介质和信息记录装置，各自包含该组合物

  • 专利标题： Glass composition, and information recording medium substrate, information recording medium, and information recording device each comprising the composition
  • 专利标题（中）： 玻璃组合物，信息记录介质基材，信息记录介质和信息记录装置，各自包含该组合物
  • 申请号： US09690756
    申请日： 2000-10-18
  • 公开(公告)号： US06451720B1
    公开(公告)日： 2002-09-17
  • 发明人: Shoichi Kishimoto , Akihiro Koyama , Hiroyuki Tanaka
  • 申请人： Shoichi Kishimoto , Akihiro Koyama , Hiroyuki Tanaka
  • 优先权： JP11-296448 19991019
  • 主分类号： C03C3062
  • IPC分类号： C03C3062
Glass composition, and information recording medium substrate, information recording medium, and information recording device each comprising the composition
摘要：
A glass composition is disclosed which has a high modulus of elasticity and a low density, i.e., has a high specific modulus. Also disclosed is an inexpensive glass composition which is suitable for use as an information recording medium substrate, for example, because it can be formed easily, is less apt to suffer devitrification, is suitable for mass production, and can be easily made to have high surface smoothness by polishing. The glass compositions comprise, in terms of mol %, 35 to 45% silicon dioxide (SiO2), 15 to 20% aluminum oxide (Al2O3), 3 to 10% lithium oxide (Li2O), 0.1 to 5% sodium oxide (Na2O), 15 to 30% magnesium oxide (MgO), 0 to 10% calcium oxide (CaO), 0 to 4% strontium oxide (SrO), 25 to 35% RO (MgO+CaO+SrO), 2 to 10% titanium dioxide (TiO2), 0.5 to 4% zirconium oxide (ZrO2), 4 to 12% TiO2+ZrO2, and 0 to 4% yttrium oxide (Y2O3).
摘要（中）：

公开了具有高弹性模量和低密度，即具有高比模量的玻璃组合物。 还公开了一种廉价的玻璃组合物，其适合用作信息记录介质基材，例如由于可以容易地形成，不易发生失透，适合于批量生产，并且可以容易地制成具有高的 表面平滑度通过抛光。 玻璃组合物以摩尔％计含有35〜45％的二氧化硅（SiO 2），15〜20％的氧化铝（Al 2 O 3），3〜10％的氧化锂（Li 2 O），0.1〜5％的氧化钠（Na 2 O） ，氧化镁（MgO）15〜30％，氧化钙（CaO）0〜10％，氧化锶（SrO）0〜4％，氧化物25〜35％（MgO + CaO + SrO）2〜10％ （TiO 2），0.5〜4％的氧化锆（ZrO 2），4〜12％的TiO 2 + ZrO 2和0〜4％的氧化钇（Y 2 O 3）。

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