Abstract:
The disclosed cover glass is produced by etching a glass substrate that has been formed by a down-drawing process, and chemically strengthening the glass substrate to provide the glass substrate with a compressive-stress layer on the principal surfaces thereof. The glass substrate contains, as components thereof, 50% to 70% by mass of SiO2, 5% to 20% by mass of Al2O3, 6% to 30% by mass of Na2O, and 0% to less than 8% by mass of Li2O. The glass substrate may also contain 0% to 2.6% by mass of CaO, if necessary. The glass substrate has an etching characteristic in which the etching rate is at least 3.7 μm/minute in an etching environment having a temperature of 22° C. and containing hydrogen fluoride with a concentration of 10% by mass.
Abstract:
A flat panel display glass substrate includes a glass comprising, in mol %, 55-80% SiO2, 3-20% Al2O3, 3-15% B2O3, and 3-25% RO (the total amount of MgO, CaO, SrO, and BaO). The contents in mol % of SiO2, Al2O3, and B2O3 satisfy a relationship (SiO2+Al2O3)/(B2O3)=7.5-17. The strain point of the glass is 665° C. or more. The devitrification temperature of the glass is 1250° C. or less. The substrate has a heat shrinkage rate of 75 ppm or less. The rate of heat shrinkage is calculated from the amount of shrinkage of the substrate measured after a heat treatment which is performed at a rising and falling temperature rate of 10° C./min and at 550° C. for 2 hours by the rate of heat shrinkage (ppm)={the amount of shrinkage of the substrate after the heat treatment/the length of the substrate before the heat treatment}×106.
Abstract translation:平板显示器玻璃基板包括以摩尔%计含有55-80%SiO 2,3-20%Al 2 O 3,3-15%B 2 O 3和3-25%RO(MgO,CaO,SrO, 和BaO)。 SiO 2,Al 2 O 3和B 2 O的摩尔%含量满足关系式(SiO2 + Al2O3)/(B2O3)= 7.5-17。 玻璃的应变点为665℃以上。 玻璃的失透温度为1250℃以下。 基板的热收缩率为75ppm以下。 热收缩率由热处理后测定的基板的收缩量算出,该热处理以10℃/分钟和550℃的上升和下降温度进行2小时,以 热收缩率(ppm)= {热处理后的基板的收缩量/热处理前的基板的长度}×106。
Abstract:
A flat panel display glass substrate according to the present invention includes a glass comprising, as expressed in mol %, 55-80% SiO2, 3-20% Al2O3, 3-15% B2O3, 3-25% RO (the total amount of MgO, CaO, SrO, and BaO), and substantially no As2O3, and Sb2O3. The devitrification temperature of the glass is 1250° C. or less. The glass substrate has a heat shrinkage rate of 75 ppm or less. The heat shrinkage rate is calculated from the amount of shrinkage of the glass substrate measured after a heat treatment which is performed at a temperature rising and falling rate of 10° C./min and at 550° C. for 2 hours by the heat shrinkage rate (ppm)={the amount of shrinkage of the glass substrate after the heat treatment/the length of the glass substrate before the heat treatment}×106.
Abstract translation:根据本发明的平板显示器玻璃基板包括玻璃,其以摩尔%表示,为55-80%SiO 2,3-20%Al 2 O 3,3-15%B 2 O 3,3-25%RO(总量 MgO,CaO,SrO和BaO),并且基本上不含As2O3和Sb2O3。 玻璃的失透温度为1250℃或更低。 玻璃基板的热收缩率为75ppm以下。 热收缩率由热处理后测定的玻璃基板的收缩量,以10℃/分钟和550℃的升温和降温率通过热收缩率进行2小时计算 速率(ppm)= {热处理后的玻璃基板的收缩量/热处理前的玻璃基板的长度}×106。
Abstract:
A substrate for p-Si TFT flat panel displays made of a glass having a high low-temperature-viscosity characteristic temperature and manufactured while avoiding erosion/wear of a melting tank during melting through direct electrical heating. The glass substrate comprises 52-78 mass % of SiO2, 3-25 mass % of Al2O3, 3-15 mass % of B2O3, 3-20 mass % of RO, wherein RO is total amount of MgO, CaO, SrO, and BaO, 0.01-0.8 mass % of R2O, wherein R2O is total amount of Li2O, Na2O, and K2O, and 0-0.3 mass % of Sb2O3, and substantially does not comprise As2O3, wherein the mass ratio CaO/RO is equal to or greater than 0.65, the mass ratio (SiO2+Al2O3)/B2O3 is in a range of 7-30, and the mass ratio (SiO2+Al2O3)/RO is equal to or greater than 5. A related method involves melting glass raw materials blended to provide the glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
Abstract translation:一种由具有高低温粘度特性温度的玻璃制成的p-Si TFT平板显示器基板,并且在通过直接电加热熔化期间避免熔化槽的侵蚀/磨损而制造。 所述玻璃基板包含52-78质量%的SiO 2,3-25质量%的Al 2 O 3,3-15质量%的B 2 O 3,3-20质量%的RO,其中RO是MgO,CaO,SrO和BaO的总量 ,0.01-0.8质量%的R 2 O,其中,R 2 O为Li 2 O,Na 2 O,K 2 O的总量,Sb 2 O 3为0〜0.3质量%,基本上不包含As 2 O 3,CaO / (SiO2 + Al2O3)/ B2O3的质量比(SiO 2 + Al 2 O 3)/ B 2 O 3在7〜30的范围内,质量比(SiO 2 + Al 2 O 3)/ RO等于或大于5.相关方法包括将玻璃原料混合 提供玻璃组成; 将熔融玻璃形成平板玻璃的成形工序; 以及退火平板玻璃的退火步骤。
Abstract:
A glass substrate for p-Si TFT flat panel displays that is composed of a glass comprising 52-78 mass % of SiO2, 3-25 mass % of Al2O3, 3-15 mass % of B2O3, 3-25 mass % of RO, wherein RO is total amount of MgO, CaO, SrO, and BaO, 0.01-1 mass % of Fe2O3, and 0-0.3 mass % of Sb2O3, and substantially not comprising As2O3, the glass having a mass ratio (SiO2+Al2O3)/B2O3 in a range of 7-30 and a mass ratio (SiO2+Al2O3)/RO equal to or greater than 6. A method for manufacturing a glass substrate involves: a melting step of obtaining a molten glass by melting, by employing at least direct electrical heating, glass raw materials blended so as to provide the aforementioned glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
Abstract translation:一种用于p-Si TFT平板显示器的玻璃基板,由玻璃构成,包括SiO 2为52-78质量%,Al 2 O 3为3〜25质量%,B 2为3〜15质量%,RO为3〜25质量% 其中RO为MgO,CaO,SrO和BaO的总量,Fe2O3为0.01-1质量%,Sb2O3为0-0.3质量%,并且实质上不包含As2O3,玻璃的质量比(SiO 2 + Al 2 O 3)/ B2O3的范围为7〜30,质量比(SiO 2 + Al 2 O 3)/ RO为6以上。玻璃基板的制造方法包括:熔融步骤,通过熔融获得熔融玻璃,至少使用 直接电加热,玻璃原料混合以提供上述玻璃组合物; 将熔融玻璃形成平板玻璃的成形工序; 以及退火平板玻璃的退火步骤。