EP2257656A1 - Verfahren zum erzeugen einer schicht durch kaltgasspritzen - Google Patents
Verfahren zum erzeugen einer schicht durch kaltgasspritzenInfo
- Publication number
- EP2257656A1 EP2257656A1 EP09725646A EP09725646A EP2257656A1 EP 2257656 A1 EP2257656 A1 EP 2257656A1 EP 09725646 A EP09725646 A EP 09725646A EP 09725646 A EP09725646 A EP 09725646A EP 2257656 A1 EP2257656 A1 EP 2257656A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cold gas
- layer
- particles
- photocatalytic
- photocatalytic material
- 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
Links
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 producing a
- Layer on a workpiece by cold gas spraying in which a cold gas jet with particles of a layer material is directed onto the workpiece and at the same time the workpiece is irradiated with electromagnetic radiation.
- a method of the type described above is known for example from DE 10 2005 005 359 Al.
- the particles are accelerated with the cold gas jet to the surface to be coated of a workpiece toward be acted upon by an amount of energy (kinetic Ener ⁇ energy) which is not sufficient in itself to cause a permanent adhesion of the particles on the surface. Rather, this requires an additional input of energy into the layer being formed on the workpiece.
- This energy input takes place via a laser whose radiation is focused precisely on the point of impact of the cold gas jet on the workpiece.
- catalytic layers can also be produced by the method described.
- particles are selected whose surface causes the desired catalytic effect.
- layers may be made of a photocatalytic material such as titanium dioxide produced ⁇ the.
- nitrogen-doped titanium dioxide also (or titanium oxynitride) can USAGE ⁇ be det.
- ⁇ NEN may also be a sol-gel method can be applied, wherein a blend of titanium dioxide powder at high temperature in ammonia gas are particles of a nitrogen-doped titanium dioxide. Also by an oxidation of titanium nitride production is possible. Another option is ion implantation, magnetron sputtering or PVD.
- the titanium dioxide layers can be doped with the stated processes with a nitrogen content of 2 to 4.4%. The production of photocatalytic materials such as nitrogen-doped titanium dioxide thus requires a certain effort.
- Process the ⁇ ser type for example, in Nitrogen-Doped Titanium Dioxide: described An Overview of Function and Introduction to Applications, Matthew Hennek, 20 January 2007, University of Alabama. Therefore, the object of the invention is to provide a method for producing a layer on a workpiece by cold gas spraying, with which catalytic layers can be produced comparatively inexpensively with a comparatively high efficiency.
- the cold gas jet contains a reactive gas
- the particles contain a photocatalytic material
- the electromagnetic radiation contains at least one wavelength with which the photocatalytic mate ⁇ rial is activated.
- the invention furthermore vorgese ⁇ hen that the intensity of the electromagnetic radiation is set so that the photocatalytic material is activated in the already formed layer and atoms of the
- the photocatalytic material is titanium dioxide and nitrogen is used as the reactive gas.
- the stick ⁇ material which thus is also at the location of film formation is available, thus encounter and photocatalytic titanium dioxide ⁇ that is already photoactivated by introduction of UV radiation of a wavelength geeigne- th.
- nitrogen molecules can be split at the layer surface and stored in the layer surface. This process is carried out by the mechanism of chemisorption, whereby the nitrogen can displace oxygen atoms from the crystal lattice of the titanium dioxide (formation of titanium oxynitride).
- the titanium dioxide or the photocatalytic material is present in the layer material in the form of nanoparticles.
- the fact is taken into account that nanoparticles have a pronounced photocatalytic effect.
- the size of the nanoparticles before the ferred ⁇ wavelength of a photocatalyst excitation can be influenced in other respects.
- nanoparticles can not be readily separated by cold gas spraying because of their extremely low mass because of the necessary kinetic energy input, it is necessary to clump the nanoparticles into agglomerates of larger dimensions. These clusters with dimensions in the
- Micrometer range can be easily processed with the cold gas spraying process. However, the resulting microparticles have a nanostructure, which is determined by the nanoparticles used. This nanostructure is also retained after the agglomerates have been deposited on the component to be coated.
- the layer material also contains a matrix material. points, in which the photocatalytic material is incorporated during the film formation.
- This matrix material can be supplied to the cold gas jet, for example in the form of a second type of particle. It is advantageous, however, also possible to use a type of particle which already contains the components of the matrix material and of the photocatalytic material. It is particularly advantageous that the matrix material is in the form of micropatterns. These ensure namely the above-mentioned processability of the particles by cold gas spraying.
- the nanoparticles of the photocatalytic material such as, for example, titanium dioxide, can then be applied to the surface of the microparticles. This also ensures a high degree of efficiency of the photocatalytic material used, since this is present exclusively on the surface of the microparticles and can thus develop the effect as a catalyst.
- the energy input into the cold gas jet is dimensioned such that pores are formed in the layer between the particles. This can be achieved by the fact that the energy input into the cold gas jet is sufficient for the coating particles to adhere to the component to be coated, but the energy input is too low to ensure a significant compression of the material during the layer ⁇ construction. In other words, the coating particles deform only slightly so that cavities remain between them. The deformation is just sufficient to ensure adhesion of the particles on the surface or with each other. The remaining cavities then form pores or channels, which lead to an increase in surface area of the layer. This surface is then also available for use the catalytic effect of the processed material.
- the workpiece is heated during the coating.
- the photocatalytic action for incorporation of the reactive gas can be assisted in addition to the electromagnetic excitation of the photocatalytic effect.
- the thermal energy is also available for the desired reaction.
- reactive gas radicals are generated from the reactive gas by an additional energy input into the cold gas jet. This can be achieved for example by impressing an electromagnetic high-frequency or microwave radiation. Also conceivable is an excitation by UV light or laser light. The energy source must be selected depending on the reactive gas ⁇ which is to be excited. The excitation causes the choice of the correct energy source, the formation of reactive gas radicals, which have a significantly increased reactivity compared to the reactive gas molecule.
- these reactive gas radicals just ⁇ if already meet activated photocatalytic material in the layer formation on the, the doping of the photocatalytic material with the reactive gas radicals is particularly relieved. This increases the rate of incorporation of the dopant can be advantageously raised stabili ⁇ hen.
- FIG. 1 is a schematic illustration of a cold gas spraying installation, which is suitable for imple ⁇ tion of an embodiment of the inventive method
- FIGS. 2 and 3 schematically show particles and the layers formed therefrom for various exemplary embodiments of the method according to the invention
- FIG. 6 shows absorption spectra of titanium dioxide of different particle sizes for UV light.
- FIG. 1 shows a cold gas injection system.
- This has a vacuum container 11, in which on the one hand a cold gas spray nozzle 12 and on the other hand a workpiece 13 are arranged ⁇ (fastening not shown in detail).
- a first line 14 a process gas of the cold gas spray nozzle 12 can be supplied, which is not shown in detail
- Reactive gas contains (for example, nitrogen).
- the cold gas injection nozzle 12 is, as indicated by the contour, designed as a valved nozzle, through which the process gas is expanded and accelerated in the form of a cold gas jet (arrow 15) to a surface 16 of the workpiece 13.
- the process gas is heated in a manner not shown in order to provide the required process temperature in a stagnation chamber 12a upstream of the Laval nozzle 12.
- particles 19 are supplied, which are accelerated in the cold gas jet 15 and impinge on the surface 16.
- the kinetic energy of the particles 19 causes them to adhere to the surface 16, with the reactive gas being incorporated into the forming layer 20.
- the substrate in the direction of the double arrow 21 in front of the 12 Kaltgassprit nozzle 12 are reciprocated.
- the vacuum container in the vacuum 11 constantly maintains preserver ⁇ th by a vacuum pump 22, wherein the process gas is passed through a filter 23 by the vacuum pump 22 before passing to particles from ⁇ zuscheiden that upon impact with the surface 16 were not tied to this.
- different particles are used for the coating, ie particles of a matrix material and particles of a photocatalytic material, they can be introduced at different locations of the stagnation chamber 12a using a third line 18b.
- the particles of the metal matrix material may be introduced through line 18a, the particles such as the titanium dioxide of ⁇ as catalytic material through the third conduit 18b.
- This has the advantage that the residence time of the photo- tokatalytica material is longer in the stagnation chamber so that this heated more by the process gas who can ⁇ .
- the particles of catalytic material have a hö ⁇ heren melting point than that of the matrix material, so that a reliable separation can be ensured by previously heating said particles.
- the particles within the cold gas spray nozzle 12 can be heated. It is thus an additional energy input possible, which can be supplied directly to the particles 19 as thermal energy or by a relaxation in the Laval nozzle in the form of kinetic energy.
- a UV lamp 24 is installed in the vacuum ⁇ chamber 11, which is directed to the surface 16 of the workpiece 13 ⁇ piece.
- the electromagnetic energy ensures during formation of the layer 20 that the reactive gas included in the photocatalytic material who can ⁇ .
- the reactive gas included in the photocatalytic material who can ⁇ .
- an energy input into the cold gas jet 15 can be accomplished by means of a microwave generator 26.
- the reactive gas can be split into reactive gas radicals (not shown in detail).
- the reactive gas radicals support their incorporation into the photocatalytic layer.
- FIG. 2 shows a particle 19, which consists of an agglomerate of nanoparticles of a photocatalytic material 27. If this is accelerated in the cold gas jet 15 onto the surface 16 of the workpiece 13, then the nanoparticles of the photocatalytic material 27 adhere to the surface, the layer 20 forming. Is erken ⁇ nen that the kinetic energy of the cold gas stream 15 is sufficient due to the selected coating parameters not for densification of the nanoparticles of the photocatalytic material 27, so that form pores 28 between the nanoparticles. These are available as a surface for the be ⁇ ,te photocatalysis available. First, in a manner not shown, the reactive gas can also be applied in the pores.
- the finished layer 20 can then be supplied to its intended use, the pores and the layer surface being available for catalysis. For example, these could be be a self-cleaning effect of the nitrogen-doped Ti ⁇ tandioxides, which prevents contamination of surfaces.
- the coating particle 19 consists of the matrix material 29, on the surface of which nanoparticles of the photocatalytic material 27 are applied.
- the particle of the matrix material 29, for example a metal, has dimensions in the micrometer range.
- the particles 19 in turn form the layer 20, wherein pores 28 are formed between the particles 19.
- the walls of these pores are covered with the catalytic material 27, so that it can be used effectively.
- Inside the particles 19 is no photocatalytic material.
- the figure 3 can be further deduced that by means of Kaltgassprit zens and multilayer coatings can be generated.
- a base layer 30 of the matrix material has been produced on the workpiece 13, in which case the coating parameters were set in such a way that a compression of the particles took place, resulting in a massive layer.
- particles were ver ⁇ applies that contained no photocatalytic material.
- the layer 20 is positioned ⁇ builds in the manner already described, wherein the thickness of which is chosen such that out via the Overall thickness accessibility of the photocatalytic Mate ⁇ material 27 is ensured by the pore formation.
- Layer 20 can be designed in a manner not shown as Gra ⁇ serves layer.
- FIG. 5 shows schematically, using the photocatalytic material titanium dioxide as an example, that oxygen atoms (O) can be displaced by the chemisorption of nitrogen atoms (N). This produces titanium oxynitride (TiO 2 - ⁇ N x ). This process can be assisted by the reactive gas containing radicals 31.
- the choice of diameter classes of the photocatalytic titanium dioxide nanoparticles can influence the absorption spectrum of UV light.
- the preferred wavelength of excitation is a tendency for the preferred wavelength of excitation to increase with the mean diameter of the particles.
- the preferred excitation wavelengths for nanoparticles with a diameter of 40 to 60 nanometers in the UVB range and for nanoparticles with diameters up to 100 nanometers in the UVA range is achieved with the reactive gas when the emission spectrum of the UV lamp 24 is set to the maximum in the respective absorption ⁇ spectrum.
- the choice of the diameter of the nanoparticles of the catalytic ⁇ is pending from terials also the intended application of the layer. This will be the decisive criterion in the interpretation.
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)
- Laminated Bodies (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008016969A DE102008016969B3 (de) | 2008-03-28 | 2008-03-28 | Verfahren zum Erzeugen einer Schicht durch Kaltgasspritzen |
PCT/EP2009/053504 WO2009118335A1 (de) | 2008-03-28 | 2009-03-25 | Verfahren zum erzeugen einer schicht durch kaltgasspritzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2257656A1 true EP2257656A1 (de) | 2010-12-08 |
EP2257656B1 EP2257656B1 (de) | 2011-08-24 |
Family
ID=40719629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09725646A Not-in-force EP2257656B1 (de) | 2008-03-28 | 2009-03-25 | Verfahren zum erzeugen einer schicht durch kaltgasspritzen |
Country Status (8)
Country | Link |
---|---|
US (1) | US8241702B2 (de) |
EP (1) | EP2257656B1 (de) |
CN (1) | CN101978098B (de) |
AT (1) | ATE521731T1 (de) |
CA (1) | CA2719545C (de) |
DE (1) | DE102008016969B3 (de) |
DK (1) | DK2257656T3 (de) |
WO (1) | WO2009118335A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012001361A1 (de) | 2012-01-24 | 2013-07-25 | Linde Aktiengesellschaft | Verfahren zum Kaltgasspritzen |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009033620A1 (de) * | 2009-07-17 | 2011-01-20 | Mtu Aero Engines Gmbh | Kaltgasspritzen von oxydhaltigen Schutzschichten |
DE102009043319A1 (de) * | 2009-09-28 | 2011-07-07 | Helmut-Schmidt-Universität Universität der Bundeswehr Hamburg, 22043 | Photokatalytisch aktive Beschichtungen aus Titandioxid |
KR101380836B1 (ko) * | 2011-01-18 | 2014-04-09 | 한국기계연구원 | 상온진공과립분사 공정을 위한 취성재료 과립 및 이를 이용한 코팅층의 형성방법 |
US20170355018A1 (en) * | 2016-06-09 | 2017-12-14 | Hamilton Sundstrand Corporation | Powder deposition for additive manufacturing |
WO2021080694A2 (en) * | 2019-09-03 | 2021-04-29 | Georgia Tech Research Corporation | Deeply rechargeable battery systems and methods |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6364932B1 (en) * | 2000-05-02 | 2002-04-02 | The Boc Group, Inc. | Cold gas-dynamic spraying process |
US8679580B2 (en) * | 2003-07-18 | 2014-03-25 | Ppg Industries Ohio, Inc. | Nanostructured coatings and related methods |
DE102004038795B4 (de) * | 2004-08-09 | 2007-07-19 | Atg- Advanced Technology Group S.R.O. | Verfahren zur Herstellung photokatalytisch aktiver Polymere |
DE102005005359B4 (de) | 2005-02-02 | 2009-05-07 | Siemens Ag | Verfahren zum Kaltgasspritzen |
US7438948B2 (en) * | 2005-03-21 | 2008-10-21 | Ppg Industries Ohio, Inc. | Method for coating a substrate with an undercoating and a functional coating |
DE102005031101B3 (de) * | 2005-06-28 | 2006-08-10 | Siemens Ag | Verfahren zum Herstellen von keramischen Schichten |
DE102005053263A1 (de) * | 2005-11-08 | 2007-05-10 | Linde Ag | Verfahren zur Herstellung einer photokatalytisch aktiven Schicht |
US8114382B2 (en) * | 2006-12-11 | 2012-02-14 | General Electric Company | Myelin detection using benzofuran derivatives |
-
2008
- 2008-03-28 DE DE102008016969A patent/DE102008016969B3/de not_active Expired - Fee Related
-
2009
- 2009-03-25 US US12/934,902 patent/US8241702B2/en active Active
- 2009-03-25 CA CA2719545A patent/CA2719545C/en not_active Expired - Fee Related
- 2009-03-25 DK DK09725646.5T patent/DK2257656T3/da active
- 2009-03-25 WO PCT/EP2009/053504 patent/WO2009118335A1/de active Application Filing
- 2009-03-25 AT AT09725646T patent/ATE521731T1/de active
- 2009-03-25 EP EP09725646A patent/EP2257656B1/de not_active Not-in-force
- 2009-03-25 CN CN200980110034.3A patent/CN101978098B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2009118335A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012001361A1 (de) | 2012-01-24 | 2013-07-25 | Linde Aktiengesellschaft | Verfahren zum Kaltgasspritzen |
EP2620525A1 (de) | 2012-01-24 | 2013-07-31 | Linde Aktiengesellschaft | Verfahren zum Kaltgasspritzen |
WO2013110441A1 (de) | 2012-01-24 | 2013-08-01 | Linde Aktiengesellschaft | Verfahren zum kaltgasspritzen |
Also Published As
Publication number | Publication date |
---|---|
CN101978098A (zh) | 2011-02-16 |
CA2719545C (en) | 2016-03-22 |
US8241702B2 (en) | 2012-08-14 |
ATE521731T1 (de) | 2011-09-15 |
CA2719545A1 (en) | 2009-10-01 |
DE102008016969B3 (de) | 2009-07-09 |
EP2257656B1 (de) | 2011-08-24 |
DK2257656T3 (da) | 2011-12-05 |
WO2009118335A1 (de) | 2009-10-01 |
CN101978098B (zh) | 2013-02-13 |
US20110027496A1 (en) | 2011-02-03 |
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