DE10139930B4 - Process for the production of electrically conductive nitride layers on chromium-containing metal alloys - Google Patents
Process for the production of electrically conductive nitride layers on chromium-containing metal alloys Download PDFInfo
- Publication number
- DE10139930B4 DE10139930B4 DE2001139930 DE10139930A DE10139930B4 DE 10139930 B4 DE10139930 B4 DE 10139930B4 DE 2001139930 DE2001139930 DE 2001139930 DE 10139930 A DE10139930 A DE 10139930A DE 10139930 B4 DE10139930 B4 DE 10139930B4
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- DE
- Germany
- Prior art keywords
- chromium
- containing metal
- electrically conductive
- nitrogen
- plasma
- 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.)
- Expired - Fee Related
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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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
Abstract
Verfahren zur Herstellung von elektrisch leitfähigen Nitridschichten auf chromhaltigen Metalllegierungen, dadurch gekennzeichnet, dass in einer plasmachemischen Reaktion die natürliche, elektrisch nichtleitende Cr2O3-Passivierungsschicht der chromhaltigen Metalllegierung mittels der in stickstoffhaltigen Hochdruckplasmen erzeugten Radikale in eine elektrisch leitende CrN-Schicht überführt wird.Process for the preparation of electrically conductive nitride layers on chromium-containing metal alloys, characterized in that the natural, electrically non-conductive Cr 2 O 3 passivation layer of the chromium-containing metal alloy is converted into an electrically conductive CrN layer by means of the radicals generated in nitrogen-containing high-pressure plasmas in a plasma-chemical reaction.
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von elektrisch leitfähigen Nitridschichten auf chromhaltigen Metalllegierungen.The The invention relates to a process for the production of electrical conductive Nitride layers on chromium-containing metal alloys.
Es ist bekannt, dass chromhaltige Metallegierungen, insbesondere Edelstähle wie V2A oder V4A, einen metallisch leitfähigen Kern mit einer natürlichen elektrisch nichtleitende Passivierungsschicht aufweisen. Diese Passivierungsschicht ist über eine Chromoxidphase (Cr2O3) definiert.It is known that chromium-containing metal alloys, in particular stainless steels such as V2A or V4A, have a metallically conductive core with a natural electrically non-conductive passivation layer. This passivation layer is defined by a chromium oxide phase (Cr 2 O 3 ).
Chromhaltige
Metalllegierungen kommen als verbindendes Element für Brennstoffzellen,
als sogenannte Bipolarplatten zum Einsatz. In
Die Beschichtung der Metalllegierung mit den nichtmetallischen Schichten erfolgt mittels konventioneller Beschichtungstechnologien, z.B. Sputtern, plasmagestützter PVD-(physical vapor deposition), CVD-(chemical vapor deposition) Verfahren, thermischer Zersetzung von organischen Verbindungen, lasergestützte Verfahren oder geeignete Hybridverfahren.The Coating of the metal alloy with the non-metallic layers takes place by means of conventional coating technologies, e.g. Sputtering, plasma assisted PVD (physical vapor deposition), CVD (chemical vapor deposition) Process, thermal decomposition of organic compounds, laser-assisted Method or suitable hybrid method.
Diese Verfahren sind zeit- und kostenintensiv. Außerdem sind diese bekannten Verfahren spezifische Vakuumprozesse, die nicht in einer Fertigungslinie integrierbar sind.These Procedures are time consuming and costly. In addition, these are known Process specific vacuum processes that are not in a production line can be integrated.
Aufgabe der Erfindung ist es, ein neues Verfahren zur Herstellung von Nitridschich ten auf chromhaltigen Metalllegierungen anzugeben, welches unter Normal- und Hochdruckprozessen einsetzbar ist.task It is the object of the invention to provide a novel process for producing nitride film specify on chromium-containing metal alloys, which under Normal and high pressure processes can be used.
Diese Aufgabe wird mit das Verfahren nach Anspruch 1 gelöst. Weiter vorteilhafte Ausführungen des erfindungsgemäßen Verfahrens sind Gegenstand von Unteransprüchen.These The object is achieved by the method according to claim 1. Further advantageous embodiments of inventive method are the subject of dependent claims.
Erfindungsgemäß wird in einer plasmachemischen Reaktion die natürliche, elektrisch nichtleitende Cr2O3-Passivierungsschicht der chromhaltigen Metalllegierung mittels der in stickstoffhaltigen Hochdruckplasmen erzeugten Radikale in eine elektrisch leitende CrN-Schicht überführt. Insbesondere werden die Plasmen bei einem Druck p > 1 atm erzeugt.According to the invention, the natural, electrically non-conductive Cr 2 O 3 passivation layer of the chromium-containing metal alloy is converted by means of the radicals generated in nitrogen-containing high-pressure plasmas into an electrically conductive CrN layer in a plasma-chemical reaction. In particular, the plasmas are generated at a pressure p> 1 atm.
Der Vorteil hierbei ist, dass die CrN-Schichten wesentlich kostengünstiger und schneller als mit den im Stand der Technik bekannten Nitrierungsverfahren herzustellen sind. Weitere Vorteile ergeben sich aus der Integration des erfindungsgemäßen Verfahrens in eine Fertigungslinie. Außerdem sind die mittels des erfindungsgemäßen Verfahrens erzeugten CrN-Schichten kompakter und haftfähiger als die mit bekannten Verfahren hergestellten Schichten. Ein weiterer Vorteil ist, dass das erfindungsgemäße Verfahre auf keine bestimmte Basislegierung beschränkt ist. So kann die chromhaltige Metallegierung vorteilhaft eine Eisen- oder Nickel- oder Kobalt-Basislegierung sein.Of the The advantage here is that the CrN layers are much cheaper and faster than with the nitration methods known in the art are to produce. Further advantages result from the integration the method according to the invention in a production line. Furthermore are the CrN layers produced by the method according to the invention more compact and more adhesive as the layers produced by known methods. Another The advantage is that the method according to the invention is not specific Base alloy is limited. Thus, the chromium-containing metal alloy can advantageously be an iron or nickel or cobalt base alloy be.
In einer bevorzugten Ausführung der Erfindung wird das stickstoffhaltige Hochdruckplasma mittels Plasmagase, die Stickstoff-Wasserstoff-Gemischen, Ammoniak, Hydrazin, Aminoverbindungen oder Gemischen daraus enthalten, erzeugt. Das Hochdruckplasma wird dabei in einer weiteren vorteilhaften Ausführung des erfindungsgemäßen Verfahrens in einer heißen Gleichgewichtsentladung oder einer kalten Nichtgleichgewichtsentladung erzeugt. Der Vorteil hierbei ist, dass sich mit diesen Entladungen die Prozeßführung derart einstellen läßt, dass die thermische Belastung der zu beschichtenden Werkstücke während des Nitrierprozesses gering gehalten werden kann, insbesondere unterhalb 200°C.In a preferred embodiment the invention, the nitrogen-containing high-pressure plasma by means Plasma gases, the nitrogen-hydrogen mixtures, ammonia, hydrazine, Amino compounds or mixtures thereof. The high pressure plasma is doing in a further advantageous embodiment of the method according to the invention in a hot Equilibrium discharge or a cold non-equilibrium discharge generated. The advantage here is that with these discharges the process management in such a way lets set that the thermal load of the workpieces to be coated during the Nitriding process can be kept low, especially below 200 ° C.
Zur Verstärkung der mit dem erfindungsgemäßen Verfahren erzeugten CrN-Schicht ist es vorteilhaft weitere Schichten mittels Hochdruck-Plasmabeschichtungsprozesse auf die CrN-Schicht aufzubringen.to reinforcement with the inventive method produced CrN layer, it is advantageous to further layers by means Apply high-pressure plasma coating processes to the CrN layer.
Das
erfindungsgemäße Verfahren
läuft bevorzugt
mit atomaren Stickstoff N oder Aminoradikalen ab. Die einzige Figur
zeigt den Verlauf der Gleichgewichtskonstanten KP der
Reaktion
In der Figur ist Log KP über 1/T aufgetragen, wobei T die Temperatur bedeutet. Der Verlauf von Log KP zeigt, dass das Gleichgewicht der obigen Reaktion auf der rechten Seite liegt.In the figure Log K P is plotted against 1 / T, where T is the temperature. The course of Log K P shows that the equilibrium of the above reaction is on the right.
Eine
thermodynamische Analyse der systemrelevanten Partikulärreaktionen
Bei der Erzeugung eines Hochdruckplasmas mittels Gasen, die Aminoverbindungen enthalten, kann die Bildung der CrN-Schicht auch mittels des Aminoradikals NH2 erfolgen.When generating a high-pressure plasma by means of gases which contain amino compounds, the formation of the CrN layer can also take place by means of the amino radical NH 2 .
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE2001139930 DE10139930B4 (en) | 2001-08-14 | 2001-08-14 | Process for the production of electrically conductive nitride layers on chromium-containing metal alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE2001139930 DE10139930B4 (en) | 2001-08-14 | 2001-08-14 | Process for the production of electrically conductive nitride layers on chromium-containing metal alloys |
Publications (2)
Publication Number | Publication Date |
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DE10139930A1 DE10139930A1 (en) | 2003-04-30 |
DE10139930B4 true DE10139930B4 (en) | 2005-09-15 |
Family
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DE2001139930 Expired - Fee Related DE10139930B4 (en) | 2001-08-14 | 2001-08-14 | Process for the production of electrically conductive nitride layers on chromium-containing metal alloys |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102586772B (en) * | 2012-02-24 | 2013-08-21 | 济宁新格瑞水处理有限公司 | Passivation process after chemical cleaning of boiler |
-
2001
- 2001-08-14 DE DE2001139930 patent/DE10139930B4/en not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
---|
Surface and Coatings Technology 132(2000) S. 270-274 * |
Surface and Coatings Technology 145(2001) S. 31-37 * |
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DE10139930A1 (en) | 2003-04-30 |
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8339 | Ceased/non-payment of the annual fee |