EP1785508A2 - Méthode de fabrication d'un couche photocatalyseure - Google Patents

Méthode de fabrication d'un couche photocatalyseure Download PDF

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Publication number
EP1785508A2
EP1785508A2 EP06022877A EP06022877A EP1785508A2 EP 1785508 A2 EP1785508 A2 EP 1785508A2 EP 06022877 A EP06022877 A EP 06022877A EP 06022877 A EP06022877 A EP 06022877A EP 1785508 A2 EP1785508 A2 EP 1785508A2
Authority
EP
European Patent Office
Prior art keywords
metal
cold gas
photocatalytically active
particles
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06022877A
Other languages
German (de)
English (en)
Other versions
EP1785508B1 (fr
EP1785508A3 (fr
Inventor
Peter Heinrich
Heinrich Prof. Dr. Kreye
Tobias Schmidt
Frank Dr. Gärtner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
Original Assignee
Linde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP1785508A2 publication Critical patent/EP1785508A2/fr
Publication of EP1785508A3 publication Critical patent/EP1785508A3/fr
Application granted granted Critical
Publication of EP1785508B1 publication Critical patent/EP1785508B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles

Definitions

  • the invention relates to a method for the production of metallic objects, such as films, sheets or moldings, with photocatalytically active surface according to the preamble of claim 1.
  • the peculiarity of the photocatalytically active components mainly titanium dioxide is to break the bonds in the molecules of pollutants and to decompose the substances in question into harmless, simply structured reaction products.
  • the object of the invention is to improve a corresponding process for the production of photocatalytically active layers on metals in such a way that more adhesive, long-term stable layers are produced.
  • This object is achieved in that instead of the pure oxide ceramic, a mixture of oxide ceramic and metallic powder is injected.
  • the injection of hard ceramic with a metal mixture has the advantage that there are always components that can deform when hitting. Especially the metal parts deform on impact, forming a new matter that penetrates into the existing layer, thus increasing the adhesion and the resistance.
  • the metal particles penetrate into the gaps, but also penetrates a metal impinging ceramic particles into the metal and is thereby enclosed by the metal and firmly connected to the metal.
  • metals and metal alloys in question are virtually all metals and metal alloys in question, which can be injected without ceramic additive.
  • Tuned to the application of the photocatalytic layer are e.g. Metals such as aluminum and copper or their alloys are interesting, which can be easily deformed (flexible tapes). Aluminum and copper are also interesting if the photocatalytically active layer should have good electrical conductivity and good thermal conductivity. In particularly aggressive environments, corrosion resistant nickel alloys or tantalum can be used.
  • the size of the particles can be in the range from 3 to 100 ⁇ m, both in the case of the metallic component and in the case of the ceramic component, and preferably in the range of 10 to 50 ⁇ m in the case of the metallic component.
  • spraying with a high-pressure system is usually carried out at pressures of 20 to 40 bar and gas temperatures of 100 to 600 ° C.
  • spraying with so-called portable devices is operated with pressures up to 10 bar and gas temperature of 300 to 600 ° C.
  • Titanium dioxide has proved to be particularly preferred as the ceramic material.
  • This powder occurs in different crystal structures, with the photocatalytically active phase anatase (anatase) being metastable. When heated to temperatures in the range 600 to 800 ° C, this phase converts to the thermodynamically more stable phase rutile, which, however, has a significantly lower efficiency than photocatalyst. Such a conversion and impairment of the photocatalytic properties can not be avoided in plasma spraying and HVOF spraying. In the case of the cold gas spraying according to the invention, by contrast, the photocatalytically active phase anatase remains fully preserved since the temperatures of the gas used for spraying are below 600 ° C.
  • anatase it is desirable to shift the photocatalytic effectiveness of the material from the UV range into the range of visible light by modifying or doping the titanium dioxide. This would significantly improve the effectiveness as a photocatalyst in daylight.
  • the photocatalytic effectiveness of anatase is greater when this material is in the nanocrystalline state, i. a powder or a layer of crystals whose dimensions are well below one micron or below 100 nm. Both developments are contrary to cold gas spraying, since the heating in this process is so low that the modified or doped state is retained and the extremely small crystals do not grow in the injection process.
  • an agglomerated (agglomerated) powder may also be used in which each particle consists of many small ceramic oxide and metal particles.
  • Small particles in the size of, for example, 0.5 to 2 ⁇ m are agglomerated by the spray-drying method known and practiced in the art into larger particles of 3 to 100 ⁇ m in diameter so that each individual particle then consists of smaller particles of both components. This happens, for example, in that the small particles are provided with an organic binder and the suspension is then dried in a stream of hot air or gas. The binder evaporates and the smaller particles are "glued together" or connected to one another by diffusion processes.
  • a powder in which the oxide-ceramic particles are each coated with a metal or a metal alloy. This coated powder is then applied to the metallic or ceramic substrates by cold gas spraying. In this case, the layer is abraded or ground in a second step by mechanical or chemical post-processing in order to expose the titanium dioxide, which is still encased in the shell after spraying, on the layer surface.
  • the metal content should be between 10% and 90%. Preferably between 30% and 60%.
  • the catalytic effect of the metallic surface is already present when the surface is occupied in a monolayer of titanium dioxide particles. This even if the monolayer is not nationwide. Surface coverage ranges from 5%, with 5-100% exhibiting a photocatalytic effect, wherein preferably a surface coverage of between 30 and 80% is set.
  • the inventive methods can be used to apply thicker layers, which are then much more loadable, since the metal components used serve as adhesives.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Catalysts (AREA)
EP06022877A 2005-11-08 2006-11-02 Méthode de fabrication d'une couche photocatalytique Not-in-force EP1785508B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005053263A DE102005053263A1 (de) 2005-11-08 2005-11-08 Verfahren zur Herstellung einer photokatalytisch aktiven Schicht

Publications (3)

Publication Number Publication Date
EP1785508A2 true EP1785508A2 (fr) 2007-05-16
EP1785508A3 EP1785508A3 (fr) 2007-08-22
EP1785508B1 EP1785508B1 (fr) 2009-04-08

Family

ID=37667250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06022877A Not-in-force EP1785508B1 (fr) 2005-11-08 2006-11-02 Méthode de fabrication d'une couche photocatalytique

Country Status (4)

Country Link
US (1) US20070148363A1 (fr)
EP (1) EP1785508B1 (fr)
AT (1) ATE428007T1 (fr)
DE (2) DE102005053263A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009118335A1 (fr) 2008-03-28 2009-10-01 Siemens Aktiengesellschaft Procédé pour former une couche par projection dynamique à froid
DE102012001361A1 (de) 2012-01-24 2013-07-25 Linde Aktiengesellschaft Verfahren zum Kaltgasspritzen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009043319A1 (de) 2009-09-28 2011-07-07 Helmut-Schmidt-Universität Universität der Bundeswehr Hamburg, 22043 Photokatalytisch aktive Beschichtungen aus Titandioxid
DE102011083054A1 (de) 2011-09-20 2013-03-21 Hamburg Innovation Gmbh Verfahren zur photokatalytisch aktiven Beschichtung von Oberflächen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176227A1 (fr) * 2000-07-26 2002-01-30 DaimlerChrysler AG Procédé pour la formation d'une couche superficielle
DE102004038795A1 (de) * 2004-08-09 2006-03-02 Ballhorn, Reinhard, Dr. Verfahren zur Herstellung photokatalytisch aktiver Polymere

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578114A (en) * 1984-04-05 1986-03-25 Metco Inc. Aluminum and yttrium oxide coated thermal spray powder
DE10224780A1 (de) * 2002-06-04 2003-12-18 Linde Ag Verfahren und Vorrichtung zum Kaltgasspritzen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176227A1 (fr) * 2000-07-26 2002-01-30 DaimlerChrysler AG Procédé pour la formation d'une couche superficielle
DE102004038795A1 (de) * 2004-08-09 2006-03-02 Ballhorn, Reinhard, Dr. Verfahren zur Herstellung photokatalytisch aktiver Polymere

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
C-J LI ET AL: "Formation of TiO2 photocatalyst through cold spraying" IEEE CONFERENCE ON INTELLIGENT TRANSPORTATION. ITSC PROCEEDINGS, XX, XX, 10. Mai 2004 (2004-05-10), Seiten 1-5, XP008081175 *
MORIMOTO J ET AL: "Improvement of solid cold sprayed TiO2-Zn coating with direct diode laser" VACUUM, PERGAMON PRESS, GB, Bd. 73, Nr. 3-4, 19. April 2004 (2004-04-19), Seiten 527-532, XP002373228 ISSN: 0042-207X *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009118335A1 (fr) 2008-03-28 2009-10-01 Siemens Aktiengesellschaft Procédé pour former une couche par projection dynamique à froid
US8241702B2 (en) 2008-03-28 2012-08-14 Siemens Aktiengesellschsft Method for producing a coating through cold gas spraying
CN101978098B (zh) * 2008-03-28 2013-02-13 西门子公司 通过冷气喷涂形成涂层的方法
DE102012001361A1 (de) 2012-01-24 2013-07-25 Linde Aktiengesellschaft Verfahren zum Kaltgasspritzen
EP2620525A1 (fr) 2012-01-24 2013-07-31 Linde Aktiengesellschaft Procédé de pulvérisation de gaz froid
WO2013110441A1 (fr) 2012-01-24 2013-08-01 Linde Aktiengesellschaft Procédé de pulvérisation à gaz froid

Also Published As

Publication number Publication date
US20070148363A1 (en) 2007-06-28
ATE428007T1 (de) 2009-04-15
EP1785508B1 (fr) 2009-04-08
DE502006003370D1 (de) 2009-05-20
DE102005053263A1 (de) 2007-05-10
EP1785508A3 (fr) 2007-08-22

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