摘要:
The invention concerns glasses characterized by the fact that they have a refractive index higher than 1.740; a dilatation coefficient .alpha., between 25 and 300.degree. C., between 65 and 70.times.10.sup.-7 /.degree.C.; and a Littleton point not exceeding 635.degree. C. but higher than 600.degree. C.; they have the following composition, expressed in weight percent of oxides:______________________________________ SiO.sub.2 23-32.0 Al.sub.2 O.sub.3 1.5-5.0 B.sub.2 O.sub.3 5-9.0 PbO 43-54.0 Li.sub.2 O 0-0.5 Na.sub.2 O 0-1.0 K.sub.2 O 0-1.0 with Li.sub.2 O + Na.sub.2 O + K.sub.2 O
摘要:
The principal object of the present invention is organic lens molds, constituted wholly or in part of at least one specific inorganic glass, advantageously strengthened by a chemical tempering or a thermal tempering. Said glass has the following composition, expressed in percentages by weight: SiO2 56-66, Al2O3 2.5-10, B2O3 0.5-7, Li2O 0-3, Na2O 8-15, K2O 3-12, with Li2O+Na2O+K2O 12-20, ZnO 2-12, MgO 0-3, TiO2 0-0.5, ZrO2 1-9, CaO 0-1, BaO 0-2, SrO 0-2, with MgO+CaO+SrO+BaO 0-5, Cl 0-0.5, As2O3+sb2O3 0-1. The invention also deals with novel inorganic glasses which have the above composition with a single exception relative to the Al2O3 content: Al2O3 2.5-4.
摘要翻译:本发明的主要目的是有机透镜模具,全部或部分由至少一种特定的无机玻璃构成,有利于通过化学回火或热回火加强。 所述玻璃具有以重量百分数表示的以下组成:SiO 2 56-66,Al 2 O 3 2.5-10,B 2 O 3 0.5-7,Li 2 O 0-3,Na 2 O 8-15,K 2 O 3-12,Li 2 O + Na 2 O + K 2 O 12 -20,ZnO 2-12,MgO 0-3,TiO 2 0-0.5,ZrO 2 1-9,CaO 0-1,BaO 0-2,SrO 0-2,MgO + CaO + SrO + BaO 0-5, Cl 0-0.5,As2O3 + sb2O3 0-1。 本发明还涉及具有上述组成的新型无机玻璃,相对于Al 2 O 3含量为单一例外:Al 2 O 3 2.5-4。
摘要:
This invention is directed to the production of lead-free enamels containing finely-divided glass particles, finely-divided pigment particles, and an organic binder wherein the glass particles consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 35-50 Li.sub.2 O + Na.sub.2 O + K.sub.2 O
摘要:
This invention is principally directed to the preparation of transparent glass-ceramic articles which, when very rapidly crystallized in situ from precursor glass articles in plate form, exhibit very minimal distortion. The glass-ceramic articles contain .beta.-quartz solid solution as the predominant crystal phase and consist essentially, in weight percent, of______________________________________ SiO.sub.2 65-70 MgO + BaO + SrO 1.1-2.3 Al.sub.2 O.sub.3 18-19.8 ZrO.sub.2 1.0-2.5 Li.sub.2 O 2.5-3.8 As.sub.2 O.sub.3 0-1.5 MgO 0.55-1.5 Sb.sub.2 O.sub.3 0-1.5 ZnO 1.2-2.8 As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0.5-1.5 TiO.sub.2 1.8-3.2 Na.sub.2 O 0- 1.8 5.2MgO ______________________________________ The preferred glass-ceramics contain 0.1-1.0% V.sub.2 O.sub.5.
摘要:
A method of determining the magnitude of an exceptionally large current which comprises measuring the angle of rotation of polarized light in a magnetic field created by the current with a glass fiber sensor composed of a fluoride glass having a low Verdet constant and a photoelastic coefficient not over about 0.25 (nm/cm)/(kg/cm2).
摘要翻译:一种确定特大电流的大小的方法,其特征在于,测量由电流产生的磁场中的偏振光的旋转角度,该玻璃光纤传感器由玻璃纤维传感器构成,该玻璃纤维传感器由具有低维尔德常数和光弹性系数的氟玻璃组成 约0.25(nm / cm)/(kg / cm 2)。
摘要:
This invention is directed to the production of glasses useful for ophthalmic applications which exhibit excellent resistance to the development of coloration upon being exposed to x-radiation and excellent resistance to the development of solarization. The glass compositions are essentially free of lead and consist essentially, in weight percent, of______________________________________ SiO.sub.2 60-70 ZrO.sub.2 0.5-2 TiO.sub.2 0-1.5 B.sub.2 O.sub.3 0.5-5 CeO.sub.2 0.1-0.3 Sb.sub.2 O.sub.3 0-0.5 Al.sub.2 O.sub.3 2-6 Li.sub.2 O 0-2 SO.sub.3 0-0.3 Na.sub.2 O 9-14 MgO 0-5 Br 0-0.5 K.sub.2 O 3-10 SrO 0-5 Cl 0-0.5 CaO 0.5-4 BaO 0-5 F 0-0.5. ZnO 3-9 ______________________________________
摘要翻译:本发明涉及可用于眼科应用的玻璃的制备,其在暴露于x辐射时表现出优异的耐着色性的发展,并且具有优异的耐晒性发展。 玻璃组合物基本上不含铅,并且基本上以重量百分比计的-SiO 2 60-70 ZrO 2 0.5-2 TiO 2 0-1.5 -B 2 O 3 0.5-5 CeO 2 0.1-0.3 Sb 2 O 3 0-0.5 -Al 2 O 3 2-6 Li 2 O 0 -2 SO3 0-0.3 -Na2O 9-14 MgO 0-5 Br 0-0.5 -K2O 3-10 SrO 0-5 Cl 0-0.5 -CaO 0.5-4 BaO 0-5 F 0-0.5。 -ZnO 3-9 -