摘要:
A process for stably producing a glass shaped material as a base material for a crystallized glass material, which includes casting a molten glass into a through hole of a mold, the through hole having a straight central axis, said central axis being vertical or slanted relative to a horizontal, and shaping the molten glass into a rod-like glass shaped material as a base material for a crystallized glass material.
摘要:
The optical glass has a refractive index of equal to or greater than 1.65 and an Abbé number ranging from 50 to 60. In the optical glass, as molar basis, a ratio of SiO2 content to B2O3 content is greater than 0.5 and equal to or less than 0.90; a total content of SiO2 and B2O3 ranges from 50 to 70 percent; Li2O content ranges from 5 to 20 percent; La2O3 content ranges from 0.5 to 22 percent; a ratio of ZnO content to RO (MgO, CaO, SrO and BaO) is equal to or greater than 0.5; a total content of Gd2O3, Y2O3 and Yb2O3 ranges from 1 to 15 percent; Sb2O3 content ranges from 0 to 1 percent; and no BaO is comprised, or a ratio of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the content of BaO is equal to or greater than 10.
摘要翻译:光学玻璃具有等于或大于1.65的折射率和从50至60的Abbé数。在光学玻璃中,以摩尔计,SiO 2含量与B 2 <3 O 3含量大于0.5且等于或小于0.90; SiO 2和B 2 O 3 3的总含量在50-70%的范围内; Li 2 O 2含量范围为5%至20%; La 2 O 3 3含量范围为0.5%至22%; ZnO含量与RO(MgO,CaO,SrO和BaO)的比例等于或大于0.5; Gd 2 N 3 O 3,Y 2 O 3和Y b 2的总含量 SUB > O 3范围为1至15%; Sb 2 O 3 3含量为0至1%; 并且不包含BaO,或者La 2 O 3 O 3的总含量,Gd 2 O 3 3 / >,Y 2 O 3 3和Y b 2 O 3 3相对于BaO的含量等于或大于 10。
摘要:
Disclosed are a glass substrate for an information recording medium, having excellent scratch resistance and a light weight and having high fracture toughness, the glass substrate having a fragility index value, measured in water, of 12 μm−1/2 or less or having a fragility index value, measured in an atmosphere having a dew point of −5° C. or lower, of 7 μm−1/2 or less, or the glass substrate comprising, by mol %, 40 to 75% of SiO2, 2 to 45% of B2O3 and/or Al2O3 and 0 to 40% of R′2O in which R′ is at least one member selected from the group consisting of Li, Na and K), wherein the total content of SiO2, B2O3, Al2O3 and R′2O is at least 90 mol %, and a magnetic information recording medium comprising a magnetic recording layer formed on the glass substrate.
摘要:
An optical glass having a refractive index (nd) of 1.57 to 1.67, an Abbe's number (νd) of 55 to 65 and a glass transition temperature (Tg) of 560° C. or lower and having a low-temperature softening property and excellent climate resistance or a haze value of 3% or less, or an optical glass comprising, by mol %, 22 to 40% of B2O3, 12 to 40% of SiO2, 2 to 20% of Li2O, 5 to 15% of CaO, 2 to 14% of ZnO, 0.5 to 4% of La2O3, 0 to 3% of Gd2O3, 0 to 3% of Y2O3, the total content of La2O3, Gd2O3 and Y2O3 being at least 1%, 0 to 5% of Al2O3, 0 to 3% of ZrO2 and 0 to 5% of BaO, the total content of the above components being more than 96%, and having a refractive index (nd) of 1.57 to 1.67 and an Abbe's number (νd) of 55 to 65.
摘要翻译:折射率(nd)为1.57〜1.67,阿贝数(nud)为55〜65,玻璃化转变温度(Tg)为560℃以下且具有低温软化性和优异的光学玻璃 耐气候性或雾度值为3%以下,或者含有摩尔%22〜40%的B 2 O 3 3的光学玻璃,12〜40% 的SiO 2,2〜20%的Li 2 O,5〜15%的CaO,2〜14%的ZnO,0.5〜4%的La 2 O 3, 2%O 3,0〜3%的Gd 2 O 3 3,0〜3%的Y 2 < 3 O 3,3 O 3,3 O 3,3 N 3 O 3的总含量 和/或Y 2 O 3 3以及至少1%,0至5%的Al 2 O 3 3 / 0〜3%的ZrO 2和0〜5%的BaO,上述成分的总含量大于96%,折射率(nd)为1.57〜1.67 阿贝数(nud)为55至65。
摘要:
An optical glass having high refractivity and a low sag temperature and having a low-temperature softening property that enables precision press-molding is provided, and the optical glass contains, by mol %, 5 to 50% of B2O3, 3 to 50% of SiO2, 5 to 40% of TiO2, 1 to 40% of ZnO, 5 to 20% of La2O3, 0 to 10% of Gd2O3, 0 to 15% of Nb2O5, 0 to 10% of ZrO2, 0 to 5% of Ta2O5, 0 to 10% of Bi2O3, 0 to 10% of MgO, 0 to 8% of CaO, 0 to 10% of SrO, 0 to 10% of BaO, provided that the total content of MgO, CaO, SrO and BaO is 15% or less, 0 to 20% of Li2O, and 0 to 5% of Na2O, optionally containing Sb2O3 as a refining agent, and having a refractive index (nd) of 1.8 or more and an Abbe's number (vd) of 35 or less.
摘要翻译:提供了具有高折射率和低下垂温度并具有能够进行精密加压成型的低温软化性能的光学玻璃,并且光学玻璃含有摩尔%为5〜50%的B 2, 3〜50%的SiO 2,5〜40%的TiO 2,1〜40%的ZnO,5 至20%的O 2 O 3,0至10%的Gd 2 O 3 3,0至15 Nb 2 O 5的%,ZrO 2的0〜10%,Ta 2 O 5的0〜5% O 5,0〜10%的Bi 2 O 3 3,0〜10%的MgO,0〜8%的CaO,0〜 10%的SrO,0〜10%的BaO,条件是MgO,CaO,SrO和BaO的总含量为15%以下,0〜20%的Li 2 O,0〜 5%的Na 2 O,任选地含有Sb 2 O 3 3 3,作为澄清剂,并且折射率(nd)为1.8或 阿贝数(vd)为35以下。
摘要:
An optical glass which has an Abbe's number (νd) of 50 to 59, has the property of not easily reacting with a press mold, a low-temperature softening property, excellent glass stability and high refractivity, and is suitable for precision press-molding. The optical glass comprising B2O3 and SiO2 as essential components and having a B2O3 and SiO2 total content (B2O3+SiO2) of 45 to 70 by mol % and an SiO2 content/B2O3 content molar ratio (SiO2/B2O3) of from 0.1 to 0.5, the optical glass further comprising, by mol %, 5 to 15% of La2O3, 0.1 to 8% of Gd2O3, provided that the total content of La2O3 and Gd2O3 is 8% or more, 0 to 10% of Y2O3, 3 to 18% of Li2O, provided that the molar ratio of the content of Li2O to the total content of B2O3 and SiO2 [Li2O/(B2O3+SiO2)] is over 0 but not more than 0.2, 0.1 to 15% of ZnO, 2 to 20% of CaO, 0 to 5% of BaO, provided that the content of BaO is smaller than the content of ZnO, 0 to 5% of SrO, 0 to 5% of MgO, provided that the molar ratio of the total content of MgO, CaO, SrO and BaO to the total content of B2O3 and SiO2 [(MgO+CaO+SrO+BaO)/(B2O3+SiO2) is from 0.1 to 0.4, and 0 to 5% of ZrO2, and having a refractive index (nd) and an Abbe's number (νd) which satisfy the equation (1), νd≧308.5−150×nd (in which 50≦νd≦59) (1)
摘要:
Provided is a substrate for information recording medium composed of such a crystallized glass as having high Young's modulus, strength and heat resistance, being excellent in surface smoothness, surface homogeneity and surface processability, as well as having a relatively low temperature of glass liquid phase and being capable of producing cheaply, and an information recording medium using this substrate.The crystallized glass substrate for information recording medium comprising 35–65 mol % of SiO2, 5–25 mol % of Al2O3, 10–40 mol % of MgO and 5–15 mol % of TiO2, in which the total amount of aforementioned composition is at least equal to or higher than 92 mol % and the main crystals are enstatite and/or its solid solution. The information recording medium having this substrate and a recording layer formed on said substrate.
摘要:
A glass substrate for an information recording medium, which has high heat resistance, has such high thermal shock resistance that it does not break when exposed to a sharp change in temperature and has high strength against scratching, and which is formed of a glass comprising SiO2, Al2O3, ZrO2, CaO, BaO, Li2O and Na2O as essential components and comprises, by mold %, 50 to 70% of SiO2, 1 to 10% of Al2O3, over 0% but not more than 12% of ZrO2, 2 to 24% of CaO, over 0% but not more than 15% of BaO, 0 to 10% of MgO, 0 to 15% of SrO, provided that the content of CaO+BaO+MgO+SrO is over 10% but less than 25%, over 0% but not more than 6% of Li2O, over 0% but not more than 10% of Na2O, 0 to 5% of K2O, and 0 to 10% of TiO2.
摘要:
A glass substrate having a high Young's modulus and high rigidity and being suitable particularly as a substrate that is required to have excellent surface smoothness, a high elastic modulus and a high expansion coefficient and which is for an information recording medium, the glass substrate having a surface having a center-line average roughness ratio, Rab/Raf, of 0.8 to 1, in which Raf is a center-line average roughness measured after the glass substrate is held in water having a temperature of 80° C. for 24 hours and Rab is a center-line average roughness Rab measured before the holding, and having a Young's modulus of 90 GPa or more, and an information recording medium having the glass substrate and having an information recording layer formed on the glass substrate.
摘要:
An optical glass taking account of meltability and the moldability of a preform, having optical constants including a refractive index (nd) of at least 1.57 but less than 1.67 and an Abbe's number (νd) of over 55 but not more than 65, having the property of softening at a low temperature and being suitable as a glass for precision press-molding, the optical glass including an optical glass containing B2O3, SiO2, La2O3, Gd2O3, an alkali metal oxide and an alkaline earth metal oxide as essential components, having a B2O3 and SiO2 total content of 52% by weight or more and having an SiO2/B2O3 content ratio of from 0.38 to 1.2, and an optical glass wherein the relationship of the refractive index (nd) and the Abbe's number (νd) satisfies the equation (1), νd>260−126×nd (1).
摘要翻译:考虑到熔融性和预型件的成型性的光学玻璃,其具有包括折射率(nd)至少为1.57但小于1.67的光学常数和超过55但不大于65的阿贝数(nud),其具有 在低温下软化的性质并且适合作为精密加压成型的玻璃,所述光学玻璃包括含有B 2 O 3 3,SiO 2的光学玻璃, 2 sub> 2,2 sub> 3,3 sub> 3,N 2 O 3,碱金属氧化物和 碱土金属氧化物作为必要组分,具有52重量%以上的B 2 N 3 O 3和SiO 2 2总含量,并具有 SiO 2含量比为0.38〜1.2的光学玻璃,其中折射率(nd)/ 并且阿贝数(nud)满足等式(1),<?in-line-formula description =“In-line Formulas”end =“lead”?> nud> 260-126xnd(1)。<?in-line -fo rmulae description =“在线公式”end =“tail”?>