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    • 85. 发明公开
    • ALKALI FREE GLASS AND METHOD FOR PRODUCING ALKALI FREE GLASS
    • ALKALIFREIES GLAS U​​ND VERFAHREN ZUR HERSTELLUNG VON ALKALIFREIEM GLAS
    • EP2650262A1
    • 2013-10-16
    • EP11847758.7
    • 2011-12-02
    • Asahi Glass Company, Limited
    • TSUJIMURA TomoyukiNISHIZAWA ManabuKOIKE Akio
    • C03C3/087C03C1/00C03C3/091C03C3/093
    • C03C3/091C03C3/087
    • The present invention relates to an alkali-free glass having a strain point of 725°C or higher, an average thermal expansion coefficient at from 50 to 300°C of from 30×10 -7 to 40×10 -7 /°C, a temperature T 2 at which a glass viscosity is 10 2 dPa·s of 1,710°C or lower, and a temperature T 4 at which a glass viscosity is 10 4 dPa·s of 1,320°C or lower, the alkali-free glass including, in terms of mol% on the basis of oxides, SiO 2 : 66 to 70, Al 2 O 3 : 12 to 15, B 2 O 3 : 0 to 1.5, MgO: more than 9.5 and 13 or less, CaO: 4 to 9, SrO: 0.5 to 4.5, BaO: 0 to 1, and ZrO 2 : 0 to 2, in which MgO+CaO+SrO+BaO is from 17 to 21, MgO/(MgO+CaO+SrO+BaO) is 0.4 or more, MgO/(MgO+CaO) is 0.4 or more, MgO/(MgO+SrO) is 0.6 or more, and the alkali-free glass does not substantially contain an alkali metal oxide.
    • 本发明涉及应变点为725℃以上,50〜300℃的平均热膨胀系数为30×10 -7〜40×10 -7 /℃的无碱玻璃, 玻璃粘度为10 2 dPa·s为1710℃以下的温度T 2,玻璃粘度为10 4 dPa·s的温度T 4为1320℃以下,无碱玻璃 包括以氧化物为基准的摩尔%,SiO 2:66〜70,Al 2 O 3:12〜15,B 2 O 3:0〜1.5,MgO:9.5以上13以下,CaO: 4〜9,SrO:0.5〜4.5,BaO:0〜1,ZrO 2:0〜2,MgO + CaO + SrO + BaO为17〜21,MgO /(MgO + CaO + SrO + BaO) 为0.4以上,MgO /(MgO + CaO)为0.4以上,MgO /(MgO + SrO)为0.6以上,无碱玻璃基本不含有碱金属氧化物。