摘要:
The regionally coated noble metal element used in glass production has an uncoated region for contacting a glass melt and an H2-impervious layer or an H2-impervious and O2-impervious layer on a side opposite from the uncoated region, which has a layer thickness ≧1 mm, is heat-resistant, and is either liquid or solid. This layer is made from at least one glass or glass mixture, an at least partly crystallized glass or a ceramic material. The coated noble metal element can be a Danner channel, a Vello draw head, an A-draw head, a Vello needle, a drawdown needle, a discharge ring or a Danner blowpipe. A process for coating a noble metal element to produce the regionally coated noble metal element is also described.
摘要:
The glass for a fluorescent light with a high hydrolytic resistance, which has composition, in % by weight based on oxide content of: SiO2, 63-75; B2O3, 15-18; Al2O3, 3.2-4.5; Na2O, 1-2; K2O, 2-6; ΣNa2O+K2O, 3-8; MgO, 0-8; CaO, 0-10; SrO, 0-10; BaO, 0-10; ZnO, 0-5; ΣMgO+CaO+SrO+BaO+ZnO, 0-10; ZrO2, 0-3; CeO2, 0-10; Fe2O3, 0-1; WO3, 0-3; Bi2O3, 0-5; MoO3, 0-3; TiO2, 0-10; ΣHf+Ta+W+Re+Os+Ir+Pt+La+Pr+Nd+Sm+Eu+Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu in oxidic form, 0 to 5% by weight, as well as one or more conventional refining agents. The glass is characterized in that it contains no lithium and has a weight ratio of Na2O to K2O of less than one.
摘要翻译:用于具有高耐水解性的荧光的玻璃,其具有以SiO 2,63-75的氧化物含量为基准的重量%的组成; B2O3,15-18; Al2O3,3.2-4.5; Na2O,1-2; K2O,2-6; SigmaNa2O + K2O,3-8; MgO,0-8; CaO,0-10; SrO,0-10; 宝,0-10; ZnO,0-5; SigmaMgO + CaO + SrO + BaO + ZnO,0-10; ZrO2,0-3; CeO2,0-10; Fe2O3,0-1; WO3,0-3; Bi2O3,0-5; MoO3,0-3; TiO2,0-10; 0-5重量%的SigmaHf + Ta + W + Re + Os + Ir + Pt + La + Pr + Nd + Sm + Eu + Gd + Tb + Dy + Ho + Er + Tm + Yb + 以及一种或多种常规的澄清剂。 该玻璃的特征在于它不含锂,并且Na 2 O与K 2 O的重量比小于1。
摘要:
The borosilicate glass for pharmaceutical packaging has a transmission τ in the visible range of more than 80% at a wavelength of 400 nm, a transmission τ in the UV range of at most 0.1% at wavelengths under 260 nm (each at a sample thickness of 1 mm), a transformation temperature Tg of 550° C. to 590° C. and a processing temperature VA of 1100° C. to 1200° C. The glass has a composition, in wt. % on an oxide basis, of SiO2, 60-80; B2O3, 5-15; Al2O3, 2-10; TiO2, 0.5-7; Σ Li2O+K2O+Na2O, 3-10; Σ alkaline earth oxides, 0.5-10; ZrO2, 0-3; and Fe2O3, 0-0.2. The glass is suitable for packaging UV-sensitive substances but nevertheless permits optical quality control.
摘要:
The apparatus for continuously manufacturing a calibrated round or profiled glass tube with a predetermined inner profile has a melt feed with an outlet opening for molten glass, a shaping body for forming a hollow drawing bulb from the molten glass, a profile forming body positioned downstream of the shaping body, and a device for changing a distance between the shaping body and the profile forming body to vary a wall thickness of the glass tube. The molten glass from the outlet opening is drawn over the shaping body to form the drawing bulb and the drawing bulb is drawn over the profile forming body so that inner circumferential surfaces of the drawing bulb are deformed while bearing on outer surfaces of the profile forming body to form the predetermined inner profile of the glass tube.
摘要:
The chemically resistant borosilicate glass has the following composition (in % by weight): SiO2, 67-74; B2O3, 5-10; Al2O3, 3-10; Li2O, 0-4; Na2O, 0-10; K2O, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO2, 0-3; CeO2, 0-1; with ΣLi2O+Na2O+K2O=0.5 to 10.5 and ΣMgO+CaO+SrO+BaO+ZnO=0-6. The borosilicate glass is characterized by a composition including 0 to 10% of at least one of TiO2, Bi2O3 and MoO3 and a sum total of TiO2+Bi2O3+MoO3 of 0.1 to 10%. This glass is obtained from the melt under oxidative conditions. The glass is useful in gas discharge lamps, such as Xenon lamps and fluorescent lamps, and display devices, flat structured backlighting devices, and glass-to-metal seals with Mo, Wo and Ni—Fe—Co alloys.
摘要翻译:耐化学腐蚀性硼硅酸盐玻璃具有以下组成(重量%):SiO 2,67-74; B2O3,5-10; Al2O3,3-10; Li2O,0-4; Na2O,0-10; K2O,0-10; MgO,0-2; CaO,0-3; SrO,0-3; 宝,0-3; ZnO,0-3; ZrO2,0-3; CeO2,0-1; SigmaLi2O + Na2O + K2O = 0.5〜10.5,SigmaMgO + CaO + SrO + BaO + ZnO = 0-6。 硼硅酸盐玻璃的特征在于包含0〜10%的TiO 2,Bi 2 O 3和MoO 3中的至少一种,TiO 2 + Bi 2 O 3 + MoO 3的总和为0.1〜10%的组成。 这种玻璃是在氧化条件下从熔体中获得的。 该玻璃可用于气体放电灯,例如氙气灯和荧光灯,以及显示装置,平面结构的背光装置以及具有Mo,Wo和Ni-Fe-Co合金的玻璃 - 金属密封。
摘要:
The invention relates to a system for background lighting of displays or screens, including at least one lighting device including a glass envelope and a transparent element provided thereabove, at least one surface of the element being provided with a fluorescent layer on at least a portion of its surface.
摘要:
The invention relates to a heat exchanger, in particular a flat pipe evaporator (1) for a motor vehicle air conditioning system, comprising at least one collecting tank (2) made of sheet steel which is divided in the longitudinal direction into at least two chambers and the ends of the pipe, in particular, flat pipes, are introduced in the base thereof. Said collecting tank (2) comprises a tunnel-shaped part (5), an essentially flat part (4) which forms the base, and covers (6) which are arranged on the front side thereof. At least one cover (6) is embodied in a flat manner in at least the outer edge area thereof and is positioned in a positive fit in the collecting tank.
摘要:
A device is provided for heat transfer and in particular an evaporator for an air conditioning system of motor vehicles having at least one header tank including at least two header chambers which are substantially defined by a base device and a top device. The top device includes middle side walls which are arranged adjacent to one another at least over a portion. The distance between the two side walls increases with the height above the base device.
摘要:
The PbO-free UV-absorbing glass is made under oxidative conditions and has a composition, in % by weight, of: SiO2, 55-79; B2O3, 3-25; Al2O3, 0-10; Li2O, 0-10; Na2O, 0-10; K2O, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO2, 0-3; CeO2, 0-1; Fe2O3, 0-1; WO3, 0-3; Bi2O3, 0-3; MoO3, 0-3; ΣLi2O+Na2O+K2O=0.5 to 16 and ΣMgO+CaO+SrO+BaO+ZnO=0-10. It also contains from 0.1 to 10% TiO2 with at least 95% of the titanium as Ti+4 so that it has a high visible transmission, reduced color centers, and a sharp UV absorption edge. It is especially useful in lamps, display devices and glass-to-metal seals