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    • 1. 发明公开
    • GLASS COMPOSITION FOR SUBSTRATE AND METHOD FOR PRODUCING THE SAME
    • 格拉斯哥美术馆
    • EP2202207A1
    • 2010-06-30
    • EP08842802.4
    • 2008-10-22
    • Asahi Glass Company, Limited
    • NAGAI, KensukeNAKASHIMA, TetsuyaMAEDA, Kei
    • C03C3/087H01J11/02
    • H01J5/04C03C3/087H01J2217/49264
    • A glass composition for substrates excellent in productivity is provided by lowering the high temperature viscosity while securing characteristics and quality required for FPD substrates, particularly for PDP substrates.
      A glass composition for substrates, which is characterized by comprising, as represented by mass% based on oxides, from 55 to 75% of SiO 2 , from 5 to 15% of Al 2 O 3 , from 4 to 18% of MgO, from 3 to 12% of CaO, from 4 to 18% of SrO, from 0 to 20% of BaO, from 6 to 20% of Na 2 O+K 2 O, from 0.5 to 6% of ZrO 2 and from 18 to 25% of MgO+CaO+SrO+BaO, as a glass matrix composition, and containing from 0.001 to 0.6% of SO 3 , and which is further characterized in that when the viscosity is represented by η, the temperature satisfying logη=2 is at most 1,545°C and the devitrification temperature is at most the temperature satisfying logη=4, the thermal expansion coefficient is from 75×10 -7 to 90×10 -7 /°C, the specific gravity is at most 2.8, and the glass transition point is at least 600°C.
    • 通过在确保FPD基板特别是PDP基板所需的特性和质量的同时降低高温粘度来提供生产率优异的基板用玻璃组合物。 一种基材用玻璃组合物,其特征在于,以氧化物的质量%表示,以SiO 2的55〜75%,Al 2 O 3的5〜15%,MgO的4〜18% 3〜12%的CaO,4〜18%的SrO,0〜20%的BaO,6〜20%的Na 2 O + K 2 O,0.5〜6%的ZrO 2和18〜25 作为玻璃基体组合物的MgO + CaO + SrO + BaO的%,并且含有0.001〜0.6%的SO 3,其特征还在于当粘度由·表示时,满足log·= 2的温度为 最高为1545℃,失透温度为loglog = 4左右的最高温度,热膨胀系数为75×10 -7〜90×10 -7 /℃,比重为2.8以下, 玻璃化转变点至少为600℃。
    • 9. 发明公开
    • High transmittance alumina for ceramic metal halide lamps
    • 铝氧化物薄膜
    • EP1243570A2
    • 2002-09-25
    • EP02251950.8
    • 2002-03-19
    • GENERAL ELECTRIC COMPANY
    • Scott, Curtis EdwardKaliszewski, Mary SueGreskovich, Charles DavidLaska, Harry Michael
    • C04B41/91C04B35/115H01J61/30
    • C04B41/009C04B35/115C04B41/5361C04B41/91C04B2111/805H01J5/04H01J9/247H01J61/302H01J61/827
    • A high transmittance polycrystalline alumina arc tube for a metal halide discharge lamp is formed by treating an alumina arc tube material having a few percent of closed porosity in a two step process, which provides a high-transmittance arc tube. An initially porous arc tube is formed by extruding or die pressing individual components of the tube from a mixture which includes powdered alumina, assembling the components into an arc tube body, and then partially sintering the components to seal them together. The two step process includes hot isostatic pressing of the partially sintered arc tube and then chemically polishing the surface of the tube. The first, pressing step involves heating the alumina arc tube in an inert atmosphere, such as argon, at a temperature of 1600 to 1900°C and a pressure of about 700 to 2100 kg/sq.cm. for from about one to three hours. This reduces porosity in the crystalline structure. In the second step, the surface of the tube is immersed in a flux comprising a molten alkali metal borate at moderately elevated temperatures, or coated with a flux material which is heated to form the flux, to remove surface imperfections. The finished arc tube has transmittance values which approach those of single crystal sapphire arc tubes.
    • 用于金属卤化物放电灯的高透光率多晶氧化铝电弧管通过在两步法中处理具有少百分比的闭孔率的氧化铝弧管材料形成,其提供高透光率的电弧管。 通过从包括粉末状氧化铝的混合物挤出或模压管子的各个部件形成最初多孔的电弧管,将组件组装成电弧管体,然后部分烧结组件以将它们密封在一起。 两步法包括热等静压部分烧结的电弧管,然后化学抛光管的表面。 第一个压制步骤包括在惰性气氛如氩气中,在1600至1900℃的温度和约700至2100kg / sq.cm的压力下加热氧化铝弧光管。 约一到三个小时。 这降低了晶体结构中的孔隙率。 在第二步骤中,将管的表面在适度升高的温度下浸入包含熔融碱金属硼酸盐的焊剂中,或者涂覆有加热以形成焊剂的焊剂材料,以去除表面缺陷。 完成的电弧管具有接近单晶蓝宝石电弧管的透射率值。