DE10150738C1 - Process for producing a glass tube with a radiation-absorbing, aging-resistant coating and its use - Google Patents

Process for producing a glass tube with a radiation-absorbing, aging-resistant coating and its use

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Publication number
DE10150738C1
DE10150738C1 DE10150738A DE10150738A DE10150738C1 DE 10150738 C1 DE10150738 C1 DE 10150738C1 DE 10150738 A DE10150738 A DE 10150738A DE 10150738 A DE10150738 A DE 10150738A DE 10150738 C1 DE10150738 C1 DE 10150738C1
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layer
ncm
aging
radiation
glass tube
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DE10150738A
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German (de)
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Paul Richard Bahr
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Schott AG
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Schott Glaswerke AG
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Priority to DE10150738A priority Critical patent/DE10150738C1/en
Priority to AU2002347043A priority patent/AU2002347043A1/en
Priority to PCT/EP2002/011041 priority patent/WO2003033426A1/en
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
    • C03C17/3668—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating having electrical properties
    • C03C17/3678—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating having electrical properties specially adapted for use in solar cells
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/001—General methods for coating; Devices therefor
    • C03C17/003—General methods for coating; Devices therefor for hollow ware, e.g. containers
    • C03C17/005—Coating the outside
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
    • C03C17/3615—Coatings of the type glass/metal/other inorganic layers, at least one layer being non-metallic
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
    • C03C17/3626—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer one layer at least containing a nitride, oxynitride, boronitride or carbonitride
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
    • C03C17/3649—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer made of metals other than silver
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
    • C03C17/3657—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating having optical properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
    • F24S70/225—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption for spectrally selective absorption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S70/00—Details of absorbing elements
    • F24S70/30—Auxiliary coatings, e.g. anti-reflective coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Glasrohres mit strahlungsabsorbierender alterungsbeständiger Beschichtung, die eine erste IR-reflektierende Schicht auf dem Glas, eine zweite Schicht, die Aluminium und Aluminiumnitrid, eine dritte Schicht, die Aluminium und Aluminiumoxid enthält, wobei beim Auftragen der dritten Schicht O¶2¶ mit einem Volumenstrom von mit 40 Ncm·3·/min bis 60 Ncm·3·/min eingeleitet wird und eine vierte Schicht, die Aluminiumoxid enthält, umfasst.The present invention relates to a method for producing a glass tube with a radiation-absorbing, aging-resistant coating, which has a first IR-reflecting layer on the glass, a second layer which contains aluminum and aluminum nitride, a third layer which contains aluminum and aluminum oxide, the third being applied Layer O¶2¶ with a volume flow of 40 Ncm · 3 · / min to 60 Ncm · 3 · / min is introduced and comprises a fourth layer containing aluminum oxide.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Glasrohres mit strahlungsabsorbierender alterungsbeständiger Schicht sowie dessen Verwendung.The present invention relates to a method for producing a glass tube with radiation-absorbing aging-resistant layer and its use.

Aus "Neue Vakuumröhren für Sonnenkollektoren" von Martin Brunotte, Nor­ bert Dischinger, Gottfried Haas in Erneuerbare Energie, Neuentwicklungen, 1999, Heft 3" ist der Aufbau eines Absorberrohres für Vakuumröhren bekannt. Auf das Glas wird zunächst eine IR-reflektierende Schicht aus metallischem Aluminium gesput­ tert. Als nächste Schicht wird eine Aluminiumnitrid-Schicht mit Aluminium- Einlagerungen gesputtert, dann wird eine Aluminiumoxid-Schicht mit Alumini­ um-Einlagerungen gesputtert und schließlich wird eine Aluminiumoxid Deck­ schicht gesputtert. Die herkömmlich hergestellten Absorberrohren zeigen deutliche Farbveränderungen als Folge der schnellen Alterung. Die Alterung hat die Herabsetzung der Leistungsfähigkeit des Kollektors zur Folge.From "New vacuum tubes for solar collectors" by Martin Brunotte, Nor bert Dischinger, Gottfried Haas in Renewable Energy, New Developments, 1999, Issue 3 "is the Structure of an absorber tube for vacuum tubes known. On the glass first sputtered an IR reflecting layer made of metallic aluminum tert. The next layer is an aluminum nitride layer with aluminum Sputtered deposits, then an alumina layer with alumini sputtered around deposits and finally an alumina deck layer sputtered. The conventionally manufactured absorber tubes show significant color changes as a result of rapid aging. The aging causes the performance of the collector to decrease.

Aufgabe der vorliegenden Erfindung liegt darin beschichtete Rohre und ein Verfahren zu deren Herstellung bereitzustellen, wobei beschichtete Rohre er­ halten werden, die keine relevante Farbveränderungen und daher Alterung zeigen.The object of the present invention is coated tubes and a To provide processes for their preparation, wherein he coated tubes will keep that have no relevant color changes and therefore aging demonstrate.

Die Aufgabe der Erfindung wird durch ein Verfahren zur Herstellung eines Glasrohres mit strahlungsabsorbie­ render alterungsbeständiger Schicht gelöst, wobei
The object of the invention is achieved by a method for producing a glass tube with a radiation-absorbing, aging-resistant layer, wherein

  • a) eine erste IR-reflektierende Schicht auf dem Glas aufgebracht wird,a) a first IR-reflecting layer is applied to the glass,
  • b) eine zweite Schicht, die Aluminium und Aluminiumnitrid enthält, aufgebracht wird,b) a second layer containing aluminum and aluminum nitride is applied,
  • c) eine dritte Schicht, die Aluminium und Aluminiumoxid enthält, aufgebracht wird, wobei beim Auftragen der dritten Schicht O2 mit einem Volumenstrom von mit 40 Ncm3/min bis 60 Ncm3/min eingeleitet wird, und c) a third layer, which contains aluminum and aluminum oxide, is applied, O 3 being introduced at a volume flow of from 40 Ncm 3 / min to 60 Ncm 3 / min when the third layer is applied, and
  • d) eine vierte Schicht, die Aluminiumoxid enthält, aufgebracht wird.d) a fourth layer containing aluminum oxide is applied.

Bei dem erfindungsgemäßen Glasrohr wurde eine Beschichtung erhalten, die keine relevanten Farbveränderungen zeigt. Die ausbleibende Farbverände­ rung deutet auf äußerst geringe Alterung hin. Das wird erfindungsgemäß durch Einleiten eines Volumenstroms von 40 Ncm3/min bis 60 Ncm3 O2 beim Auftragen der dritten Schicht erreicht (Ncm3 = cm3 in Normzustand).In the glass tube according to the invention, a coating was obtained which showed no relevant color changes. The lack of color change indicates extremely low aging. This is achieved according to the invention by introducing a volume flow of 40 Ncm 3 / min to 60 Ncm 3 O 2 when applying the third layer (Ncm 3 = cm 3 in the normal state).

Nach einer bevorzugten Ausgestaltung der Erfindung wird beim Auftragen der dritten Schicht O2 mit einem Volumenstrom von mit 45 Ncm3/min bis 60 Ncm3/min eingeleitet. Mit diesem Volumenstrom werden sehr gute Ergeb­ nisse erzielt.According to a preferred embodiment of the invention, when the third layer is applied, O 2 is introduced at a volume flow of 45 Ncm 3 / min to 60 Ncm 3 / min. Very good results are achieved with this volume flow.

Nach einer bevorzugten Ausgestaltung der Erfindung wird beim Auftragen der dritten Schicht O2 mit einem Volumenstrom von mit 50 Ncm3/min bis 60 Ncm3/min eingeleitet. Mit diesem Volumenstrom werden sehr gute Ergeb­ nisse erzielt.According to a preferred embodiment of the invention, when the third layer is applied, O 2 is introduced at a volume flow of from 50 Ncm 3 / min to 60 Ncm 3 / min. Very good results are achieved with this volume flow.

Nach einer bevorzugten Ausgestaltung der Erfindung wird die vierte Schicht mit einer Schichtdicke von 80 nm bis 120 nm aufgebracht. According to a preferred embodiment of the invention the fourth shift with applied a layer thickness of 80 nm to 120 nm.  

Erfindungsgemäß ist die Verwendung des Glasrohres mit strahlungsabsor­ bierender alterungsbeständiger Beschichtung zur Herstellung von Vakkum- Röhrenkollektoren vorgesehen. Die äußerst geringe Alterung ergibt eine er­ höhte Leistungsfähigkeit für ein Absorberrohr in einem Kollektorrohr.According to the invention, the use of the glass tube with radiation absorber aging-resistant coating for the production of vacuum Tube collectors provided. The extremely low aging results in a he High performance for an absorber tube in a collector tube.

Die Erfindung wird anhand einer Zeichnung und Beispielen näher erläutert.The invention is explained in more detail with reference to a drawing and examples.

Zeichnungdrawing

Die Zeichnung enthält Fig. 1 und Fig. 2.The drawing comprises Figs. 1 and FIG. 2.

Fig. 1 zeigt das gemessene Verhalten von Reflexion (%) über die Wellen­ länge (nm) eines erfindungsgemäßen Schichtaufbaus vor und nach der be­ schleunigten Alterung. Die Kurve (a) steht für den Schichtaufbau vor und Kur­ ve (b) nach der Alterung. Ein Vergleich der Kurven (a) und (b) zeigt eine leichte Zunahme der Reflexion (%) im Bereich von 600 nm bis 800 nm. Das bedeutet eine sehr geringe unbedeutende Alterung des Schichtaufbaues. Fig. 1 shows the measured behavior of reflection (%) over the wavelength (nm) of a layer structure according to the invention before and after accelerated aging be. Curve (a) stands for the layer structure before and curve ve (b) after aging. A comparison of the curves (a) and (b) shows a slight increase in the reflection (%) in the range from 600 nm to 800 nm. This means a very slight insignificant aging of the layer structure.

Fig. 2 Fig. 2

Fig. 2 zeigt das gemessene Verhalten von Reflexion (%) über die Wellen­ länge (nm) eines Schichtaufbaus gemäß Vergleichsbeispiel vor und nach der beschleunigten Alterung. Die Kurve (c) steht für den Schichtaufbau vor und Kurve (d) nach der Alterung. Ein Vergleich der Kurven (c) und (d) zeigt eine starke Zunahme der Reflexion (%) im Bereich von 600 nm bis 800 nm. Das bedeutet eine sehr starke Farbveränderung, was eine schnelle Alterung des Schichtaufbaues bedeutet. Fig. 2 shows the measured behavior of reflection (%) over the wavelength (nm) of a layer structure according to the comparative example before and after the accelerated aging. Curve (c) represents the layer structure before and curve (d) after aging. A comparison of the curves (c) and (d) shows a strong increase in the reflection (%) in the range from 600 nm to 800 nm. This means a very strong color change, which means a rapid aging of the layer structure.

Beispielexample

Glasrohre (Fiolax®, 1 m lang, 16 mm Durchmesser) wurden in einen Drehkorb eines Sputters mit Aluminium als Target gegeben. Der Drehkorb wurde in eine Vakuumkammer eingesetzt. Die Vakuumkammer wurde auf einen Druck von 5-5 mbar bis 10-5 mbar evakuiert. Danach wurde Argon in die Vakuumkammer eingelassen, bis sich ein Druck von 2.10-3 bis 10.10*-3 bar einstellte. Der Drehkorb wurde in Rotationsbewegung versetzt. Die Glasrohre drehten sich um ihre eigene Rotationsachse. Nach 3 Minuten und vollständiger Bedeckung der Glasrohre mit einer Aluminiumschichtdicke von 100 nm, wurde die Span­ nung unterbrochen und 5 Sekunden N2 mit einem Volumenstrom von 35 Ncm3/min eingeleitet. Dabei wurde ein Gesamtdruck von 5.10-3 mbar bis 10.10-3 mbar eingestellt. Danach wurde die Kathode unter Spannung gesetzt. Nach 2 Minuten wurde die Spannung und N2-Zugabe unterbrochen. Danach wurde 5 Sekunden O2 mit einem Volumenstrom von 50 Ncm3/min eingeleitet. Dann wurde Kathode unter Spannung gesetzt. Danach wurde ein Gesamt­ druck von 5.10-3 mbar bis 10.10-3 mbar eingestellt. Nach 1,5 Minuten wurde die Spannung unterbrochen. Dann wurde O2 mit einem Volumenstrom von 75 Ncm3/min bis 210 Ncm3/min eingeleitet. Dabei wurde ein Gesamtdruck von 5.10-3 mbar eingestellt. Nach 5 Sekunden wurden die Kathoden unter Span­ nung gesetzt und 2,5 Minuten mit Al2O3 beschichtet.Glass tubes (Fiolax®, 1 m long, 16 mm diameter) were placed in a rotating basket of a sputter with aluminum as the target. The rotating basket was placed in a vacuum chamber. The vacuum chamber was evacuated to a pressure of 5 -5 mbar to 10 -5 mbar. Then argon was let into the vacuum chamber until a pressure of 2.10 -3 to 10.10 * -3 bar was reached. The rotating basket was rotated. The glass tubes rotated on their own axis of rotation. After 3 minutes and complete covering of the glass tubes with an aluminum layer thickness of 100 nm, the voltage was interrupted and N 2 was introduced for 5 seconds with a volume flow of 35 Ncm 3 / min. A total pressure of 5.10 -3 mbar to 10.10 -3 mbar was set. The cathode was then energized. After 2 minutes, the voltage and N 2 addition were interrupted. Then O 2 was introduced for 5 seconds with a volume flow of 50 Ncm 3 / min. Then the cathode was energized. A total pressure of 5.10 -3 mbar to 10.10 -3 mbar was then set. After 1.5 minutes the tension was interrupted. Then O 2 was introduced with a volume flow of 75 Ncm 3 / min to 210 Ncm 3 / min. A total pressure of 5.10 -3 mbar was set. After 5 seconds, the cathodes were energized and coated with Al 2 O 3 for 2.5 minutes.

Es wurde ein beschichtetes Glasrohr auf dem optischen Spektrometer auf seine Reflektionsverteilung vermessen (Kurve (a)). Dann wurde das Absorber­ rohr einer beschleunigten Alterung unterzogen. Die Beschleunigung wurde er­ reicht, indem sich das Absorberrohr im Kollektor befand und dabei auf 240°C 100 h beheizt wurde. Danach wurde erneut die Reflektionsverteilung gemes­ sen (Kurve (b)). Es wurden keine relevante Farbveränderungen beobachtet.A coated glass tube was placed on the optical spectrometer measure its reflection distribution (curve (a)). Then the absorber accelerated aging. He was accelerating is sufficient if the absorber tube was in the collector and at 240 ° C  Was heated for 100 hours. Then the reflection distribution was measured again sen (curve (b)). No relevant color changes were observed.

VergleichsbeispielComparative example

Das Vergleichsbeispiel wurde wie das Beispiel durchgeführt, jedoch mit dem Unterschied, dass 5 Sekunden O2 mit einem Volumenstrom von 70 Ncm3/min zur Herstellung der dritten Schicht eingeleitet wurde. Die gemessene Reflekti­ onsverteilung nach der beschleunigten Alterung ergab eine deutliche Farb­ veränderung. Die Farbveränderung ist eine Folge der Alterung (Kurve (d)). Die Alterung hat die Herabsetzung der Leistungsfähigkeit des Kollektors zur Folge.The comparative example was carried out as the example, with the difference that O 2 was introduced for 5 seconds at a volume flow of 70 Ncm 3 / min to produce the third layer. The measured reflection distribution after accelerated aging showed a clear color change. The color change is a result of aging (curve (d)). Aging reduces the performance of the collector.

Claims (5)

1. Verfahren zur Herstellung eines Glasrohres mit strahlungsabsorbierender alterungsbeständiger Beschichtung, wobei
  • a) eine erste IR-reflektierende Schicht auf dem Glas aufgebracht wird,
  • b) eine zweite Schicht, die Aluminium und Aluminiumnitrid enthält, aufgebracht wird,
  • c) eine dritte Schicht, die Aluminium und Aluminiumoxid enthält, aufgebracht wird, wobei beim Auftragen der dritten Schicht O2 mit einem Volumenstrom von mit 40 Ncm3/min bis 60 Ncm3/min eingeleitet wird, und
  • d) eine vierte Schicht, die Aluminiumoxid enthält, aufgebracht wird.
1. A method for producing a glass tube with a radiation-absorbing, aging-resistant coating, wherein
  • a) a first IR-reflecting layer is applied to the glass,
  • b) a second layer containing aluminum and aluminum nitride is applied,
  • c) a third layer, which contains aluminum and aluminum oxide, is applied, O 3 being introduced at a volume flow of from 40 Ncm 3 / min to 60 Ncm 3 / min when the third layer is applied, and
  • d) a fourth layer containing aluminum oxide is applied.
2. Verfahren nach Anspruch 1, wobei beim Auftragen der dritten Schicht O2 mit einem Volumen­ strom von mit 45 Ncm3/min bis 60 Ncm3/min eingeleitet wird.2. The method according to claim 1, wherein when the third layer O 2 is introduced with a volume flow of 45 Ncm 3 / min to 60 Ncm 3 / min. 3. Verfahren nach Anspruch 1 oder 2, wobei beim Auftragen der dritten Schicht O2 mit einem Vo­ lumenstrom von mit 50 Ncm3/min bis 60 Ncm3/min eingeleitet wird.3. The method according to claim 1 or 2, wherein when applying the third layer O 2 with a volume flow of 50 Ncm 3 / min to 60 Ncm 3 / min is initiated. 4. Verfahren nach mindestens einem der Ansprüche 1 bis 3, wobei die vierte Schicht mit einer Schichtdicke von 80 nm bis 120 nm aufgebracht wird.4. Procedure according to at least one of claims 1 to 3, wherein the fourth layer with a Layer thickness of 80 nm to 120 nm is applied. 5. Verwendung eines nach Anspruch 1 hergestellten Glasrohres mit strahlungsab­ sorbierender alterungsbeständiger Beschichtung zur Herstellung von Vakuum- Röhrenkollektoren.5. Use of a glass tube produced according to claim 1 with radiation sorbing, age-resistant coating for the production of vacuum Tube collectors.
DE10150738A 2001-10-13 2001-10-13 Process for producing a glass tube with a radiation-absorbing, aging-resistant coating and its use Expired - Fee Related DE10150738C1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10150738A DE10150738C1 (en) 2001-10-13 2001-10-13 Process for producing a glass tube with a radiation-absorbing, aging-resistant coating and its use
AU2002347043A AU2002347043A1 (en) 2001-10-13 2002-10-02 Glass tube with radiation-absorbing anti-aging coating
PCT/EP2002/011041 WO2003033426A1 (en) 2001-10-13 2002-10-02 Glass tube with radiation-absorbing anti-aging coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10150738A DE10150738C1 (en) 2001-10-13 2001-10-13 Process for producing a glass tube with a radiation-absorbing, aging-resistant coating and its use

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DE102006056536B3 (en) * 2006-11-27 2008-02-28 Schott Ag Radiation-selective absorber coating, particularly for absorber pipe of parabolic gutter-collector, has layer which reflects in infrared range, where reflecting layer is arranged on two barrier layers
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EP2093520A2 (en) 2008-02-20 2009-08-26 Schott AG Radiation-selective absorber coating, absorber tube and method for its manufacture
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US8555871B2 (en) 2009-10-15 2013-10-15 Schott Solar Ag Radiation-selective absorber coating and absorber tube with said radiation-selective absorber coating

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