EP1997921A2 - Gasket - Google Patents

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Publication number
EP1997921A2
EP1997921A2 EP08156343A EP08156343A EP1997921A2 EP 1997921 A2 EP1997921 A2 EP 1997921A2 EP 08156343 A EP08156343 A EP 08156343A EP 08156343 A EP08156343 A EP 08156343A EP 1997921 A2 EP1997921 A2 EP 1997921A2
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EP
European Patent Office
Prior art keywords
weight
sealing ring
base material
elements
ring according
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.)
Withdrawn
Application number
EP08156343A
Other languages
German (de)
French (fr)
Other versions
EP1997921A3 (en
Inventor
Henry Bosch
Roland Ruch
Lutz Steinert
Klaus Wintrich
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP1997921A2 publication Critical patent/EP1997921A2/en
Publication of EP1997921A3 publication Critical patent/EP1997921A3/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a sealing ring, in particular a shaft seal for a turbocharger.
  • the material of the sealing ring in particular of a shaft sealing ring, must have different properties in order in particular to be able to guarantee a sealing function over the entire service life of the turbocharger.
  • the sealing function is influenced mainly by a wear resistance or a creep of the sealing rings, so that in addition to high wear resistance and a sufficiently high creep resistance is required especially for new and highly loaded turbochargers, for example for gasoline engines.
  • the materials used hitherto for such sealing rings, in particular tool steels, are not sufficient for their creep resistance, while austenitic materials or nickel-based alloys often do not have sufficient wear resistance.
  • the invention is concerned with the problem of providing an improved embodiment for a sealing ring, which in particular overcomes the disadvantages known from the prior art.
  • the invention is based on the general idea of using a base material based on iron or on a nickel-based alloy for a sealing ring, in particular for a shaft seal of a turbocharger, and boring the sealing ring.
  • Boriding is understood as meaning a thermochemical surface hardening process for producing a wear-resistant surface on a workpiece, wherein boron causes the chemical element boron to be introduced into the edge zone of a material, here into the edge zone of the sealing ring, at a temperature between 850 and 950 ° C. This forms a Borid harsh up to a depth of about 250 microns, which causes a surprisingly good anchoring to the base material of the sealing ring.
  • boriding on the one hand achieves high wear resistance and, on the other hand, high creep resistance of the material.
  • boriding makes it possible to use the sealing rings under high mechanical and tribological loads at temperatures of up to 850 ° C.
  • wear protection layers which are applied, for example, by a PVD process
  • the boriding effect significantly improves anchoring of the wear protection layer to the base material of the sealing ring.
  • This surprisingly good connection between the base material and the wear protection layer (Borid Anlagen) prevents a flaking of the same during assembly of the shaft seals on the associated shaft, in which the shaft seals must be bent usually.
  • the hardness and thus brittle fracture tendency can be reduced with the boriding invention, so that significantly less waste during assembly and thus a significantly improved efficiency are expected.
  • the borated shaft seals can also be hardened to limit the relaxation in the assembled state.
  • the hardness of borated rotary shaft seals may be, for example, less than 60 HRC, preferably about 45 HRC.
  • Such a surprisingly good connection between the wear protection layer and the base material can not be achieved with other surface hardening methods, for example nitriding.
  • nitriding cracks may occur along the diffusion boundary between the nitride layer and the base material due to the poorer toothing / connection between the nitride layer and the base material during the bending of the shaft sealing rings, which cause a break-off of the nitride layer and thus destruction of the wear protection layer.
  • the boride layer may crack.
  • the iron-based base material is at least partially austenitic.
  • Austenite refers to ⁇ mixed crystals of iron, with austenite usually having a cubic surface centered structure.
  • the structure itself has a low hardness, which, however, can be increased for example by cold deformation.
  • the iron-based base material is at least partially martensitic.
  • Martensite is a metastable structure of solids that is non-diffusion and athermal due to a cooperative shear motion arises from the initial structure.
  • the carbon dissolved in austenite can be forcibly dissolved by a very rapid cooling, for example during quenching, resulting in a very hard structure.
  • the cooling rate at which first fractions of martensite, next to ferrite, pearlite and bainite, is called the lower critical cooling rate.
  • martensite is used in steels to achieve a hardness increase. The higher the carbon content of martensite, the higher its hardness.
  • the iron-based base material is at least partially bainitic. Bainite forms at temperatures which are between those for the formation of pearlite and martensite. In contrast to the formation of pure martensite, folding processes in the crystal lattice and diffusion processes are coupled here, which makes various conversion mechanisms possible.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Gasket Seals (AREA)
  • Sealing Devices (AREA)
  • Supercharger (AREA)
  • Powder Metallurgy (AREA)

Abstract

The sealing ring has a base material based on iron or nickel based alloy and, which is treated with boron. The base material based on iron is partly austenitic, or partly ferritic, or partly pearlitic, bainitic or martensitic. An independent claim is also included for a method for manufacturing a sealing ring, which involves utilizing borating firm, liquid, particularly paste-like or gaseous boron donors, and sintering or casting of the base material.

Description

Die Erfindung betrifft einen Dichtring, insbesondere einen Wellendichtring für einen Turbolader.The invention relates to a sealing ring, in particular a shaft seal for a turbocharger.

Abhängig von der Position eines Dichtringes in einem Turbolader muss der Werkstoff des Dichtringes, insbesondere eines Wellendichtringes, verschiedene Eigenschaften aufweisen, um insbesondere eine Dichtfunktion über die gesamte Lebensdauer des Turboladers garantieren zu können. Die Dichtfunktion wird dabei hauptsächlich von einer Verschleißbeständigkeit beziehungsweise einer Kriechneigung der Dichtringe beeinflusst, so dass insbesondere bei neuen und hochbelasteten Turboladern, beispielsweise für Ottomotoren, neben einer hohen Verschleißbeständigkeit auch eine ausreichend hohe Kriechbeständigkeit gefordert wird. Die bisher für derartige Dichtringe verwendeten Werkstoffe, insbesondere Werkzeugstähle, sind von ihrer Kriechbeständigkeit nicht ausreichend, während austenitische Werkstoffe oder Nickelbasislegierungen oftmals keine ausreichende Verschleißbeständigkeit aufweisen.Depending on the position of a sealing ring in a turbocharger, the material of the sealing ring, in particular of a shaft sealing ring, must have different properties in order in particular to be able to guarantee a sealing function over the entire service life of the turbocharger. The sealing function is influenced mainly by a wear resistance or a creep of the sealing rings, so that in addition to high wear resistance and a sufficiently high creep resistance is required especially for new and highly loaded turbochargers, for example for gasoline engines. The materials used hitherto for such sealing rings, in particular tool steels, are not sufficient for their creep resistance, while austenitic materials or nickel-based alloys often do not have sufficient wear resistance.

Die Erfindung beschäftigt sich mit dem Problem, für einen Dichtring eine verbesserte Ausführungsform anzugeben, welche insbesondere die aus dem Stand der Technik bekannten Nachteile überwindet.The invention is concerned with the problem of providing an improved embodiment for a sealing ring, which in particular overcomes the disadvantages known from the prior art.

Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

Die Erfindung beruht auf dem allgemeinen Gedanken, für einen Dichtring, insbesondere für einen Wellendichtring eines Turboladers, ein Grundmaterial auf Eisenbasis oder auf einer Nickelbasislegierung zu verwenden und den Dichtring zu borieren. Unter Borieren versteht man ein thermochemisches Randschichthärteverfahren zur Erzeugung einer verschleißfesten Oberfläche auf einem Werkstück, wobei beim Borieren das chemische Element Bor in die Randzone eines Werkstoffes, hier in die Randzone des Dichtringes, bei einer Temperatur zwischen 850 und 950 °C eingebracht wird. Hierbei bildet sich bis in eine Tiefe von ca. 250 µm eine Boridschicht, welche eine überraschend gute Verankerung zum Grundmaterial des Dichtringes bewirkt. Prinzipiell wird durch das Borieren einerseits eine hohe Verschleißfestigkeit und andererseits eine hohe Kriechbeständigkeit des Materials erreicht. Darüber hinaus ermöglicht das Borieren einen Einsatz der Dichtringe bei hohen mechanischen und tribologischen Belastungen bei Temperaturen von bis zu 850 °C. Im Unterschied zu Verschleißschutzschichten, welche beispielsweise durch ein PVD-Verfahren aufgebracht werden, wird durch das Borieren eine deutlich verbesserte Verankerung der Verschleißschutzschicht mit dem Grundwerkstoff des Dichtringes bewirkt. Diese überraschend gute Verbindung zwischen dem Grundmaterial und der Verschleißschutzschicht (Boridschicht), verhindert insbesondere ein Abplatzen derselben bei der Montage der Wellendichtringe auf der zugehörigen Welle, bei welcher die Wellendichtringe üblicherweise aufgebogen werden müssen.The invention is based on the general idea of using a base material based on iron or on a nickel-based alloy for a sealing ring, in particular for a shaft seal of a turbocharger, and boring the sealing ring. Boriding is understood as meaning a thermochemical surface hardening process for producing a wear-resistant surface on a workpiece, wherein boron causes the chemical element boron to be introduced into the edge zone of a material, here into the edge zone of the sealing ring, at a temperature between 850 and 950 ° C. This forms a Boridschicht up to a depth of about 250 microns, which causes a surprisingly good anchoring to the base material of the sealing ring. In principle, boriding on the one hand achieves high wear resistance and, on the other hand, high creep resistance of the material. In addition, boriding makes it possible to use the sealing rings under high mechanical and tribological loads at temperatures of up to 850 ° C. In contrast to wear protection layers, which are applied, for example, by a PVD process, the boriding effect significantly improves anchoring of the wear protection layer to the base material of the sealing ring. This surprisingly good connection between the base material and the wear protection layer (Boridschicht), in particular prevents a flaking of the same during assembly of the shaft seals on the associated shaft, in which the shaft seals must be bent usually.

Im Vergleich zu ausschließlich gehärteten Wellendichtringen, welche üblicherweise sehr spröde sind und dadurch zu einem Brechen beim Montieren neigen, kann mit dem erfindungsgemäßen Borieren die Härte und damit die Sprödbruchneigung reduziert werden, so dass deutlich weniger Ausschuss bei der Montage und damit eine deutlich verbesserte Wirtschaftlichkeit zu erwarten sind. Selbstverständlich können/müssen auch die borierten Wellendichtringe gehärtet sein, um die Relaxation in montiertem Zustand zu begrenzen. Die Härte bei borierten Wellendichtringen kann aber beispielsweise kleiner als 60 HRC, vorzugsweise ca. 45 HRC betragen.Compared to exclusively hardened shaft seals, which are usually very brittle and thereby tend to break when mounting, the hardness and thus brittle fracture tendency can be reduced with the boriding invention, so that significantly less waste during assembly and thus a significantly improved efficiency are expected. Of course, the borated shaft seals can also be hardened to limit the relaxation in the assembled state. However, the hardness of borated rotary shaft seals may be, for example, less than 60 HRC, preferably about 45 HRC.

Eine derartig überraschend gute Verbindung zwischen der Verschleißschutzschicht und dem Grundmaterial, ist mit anderen Randschichthärteverfahren, beispielsweise dem Nitrieren, nicht zu erzielen. Beim Nitrieren kann es aufgrund der schlechteren Verzahnung/Verbindung zwischen der Nitridschicht und dem Grundmaterial beim Aufbiegen der Wellendichtringe zu entlang der Diffusionsgrenze zwischen der Nitridschicht und dem Grundmaterial verlaufenden Rissen kommen, die ein Abplatzen der Nitridschicht und damit eine Zerstörung der Verschleißschutzschicht bewirken. Selbstverständlich kann es auch beim Aufbiegen von borierten Wellendichtringen zu einem Reißen der Boridschicht kommen. Durch die gute Verzahnung zwischen der Boridschicht und dem Grundmaterial verlaufen die auftretenden Risse hierbei jedoch ohne Richtungsänderung über die Diffusionsgrenze hinweg, so dass insbesondere keine entlang der Diffusionsgrenze verlaufenden Risse auftreten, die ursächlich für das Abplatzen der Verschleißschutzschicht sind. Die beim Aufbiegen entstandenen Risse können sich nach der Montage der Wellendichtringe wieder schließen, ohne dass von diesen eine Gefahr für die Verschleißschutzschicht ausgeht.Such a surprisingly good connection between the wear protection layer and the base material can not be achieved with other surface hardening methods, for example nitriding. During nitriding, cracks may occur along the diffusion boundary between the nitride layer and the base material due to the poorer toothing / connection between the nitride layer and the base material during the bending of the shaft sealing rings, which cause a break-off of the nitride layer and thus destruction of the wear protection layer. Of course, even when bending borated shaft sealing rings, the boride layer may crack. Due to the good interlocking between the boride layer and the base material However, the cracks occurring in this case run without change of direction across the diffusion boundary, so that in particular no cracks running along the diffusion boundary occur, which are the cause of the chipping of the wear protection layer. The cracks produced during bending can close again after the shaft seal rings have been installed, without these posing any danger for the wear protection layer.

Mit den erfindungsgemäßen borierten Wellendichtringen, lassen sich somit mehrere wesentliche Vorteile realisieren:

  • verbesserte Verschleißbeständigkeit der Wellendichtringe und damit eine längere Lebensdauer,
  • reduzierte Sprödbruchneigung und dadurch einen geringeren Ausschussanteil bei der Montage,
  • verbesserte Wirtschaftlichkeit.
With the borated shaft sealing rings according to the invention, several important advantages can thus be realized:
  • improved wear resistance of the shaft seals and thus a longer life,
  • reduced brittle fracture tendency and thus a lower reject rate during assembly,
  • improved economy.

Zweckmäßig ist das Grundmaterial auf Eisenbasis zumindest teilweise austenitisch. Als Austenit werden γ-Mischkristalle des Eisens bezeichnet, wobei Austenit üblicherweise eine kubischflächen-zentrierte Struktur aufweist. Das Gefüge an sich besitzt eine geringe Härte, welche jedoch beispielsweise durch Kaltverformung gesteigert werden kann.Suitably, the iron-based base material is at least partially austenitic. Austenite refers to γ mixed crystals of iron, with austenite usually having a cubic surface centered structure. The structure itself has a low hardness, which, however, can be increased for example by cold deformation.

Alternativ dazu ist denkbar, dass das Grundmaterial auf Eisenbasis zumindest teilweise martensitisch ist. Martensit ist ein metastabiles Gefüge von Festkörpern, das die diffusionslos und athermische durch eine kooperative Scherbewegung aus dem Ausgangsgefüge entsteht. Beispielsweise kann der im Austenit gelöste Kohlenstoff durch eine sehr rasche Abkühlung, beispielsweise beim Abschrecken, zwangsgelöst werden, wodurch ein sehr hartes Gefüge entsteht. Die Abkühlgeschwindigkeit, bei welcher erste Anteile von Martensit, neben Ferrit, Perlit und Bainit entstehen, heißt dabei untere kritische Abkühlgeschwindigkeit. Generell wird Martensit bei Stählen verwendet, um einen Härteanstieg zu erzielen. Je höher dabei der Kohlenstoffgehalt des Martensits ist, desto höher ist auch dessen Härte.Alternatively, it is conceivable that the iron-based base material is at least partially martensitic. Martensite is a metastable structure of solids that is non-diffusion and athermal due to a cooperative shear motion arises from the initial structure. For example, the carbon dissolved in austenite can be forcibly dissolved by a very rapid cooling, for example during quenching, resulting in a very hard structure. The cooling rate at which first fractions of martensite, next to ferrite, pearlite and bainite, is called the lower critical cooling rate. In general, martensite is used in steels to achieve a hardness increase. The higher the carbon content of martensite, the higher its hardness.

Als weitere Alternative ist denkbar, dass das Grundmaterial auf Eisenbasis zumindest teilweise bainitisch ist. Bainit bildet sich dabei bei Temperaturen, welche zwischen den für die Perlit- bzw. Martensitbildung liegen. Anders als bei der Bildung von reinem Martensit sind hier Umklappvorgänge im Kristallgitter und Diffusionsvorgänge gekoppelt, wodurch verschiedene Umwandlungsmechanismen möglich werden.As a further alternative, it is conceivable that the iron-based base material is at least partially bainitic. Bainite forms at temperatures which are between those for the formation of pearlite and martensite. In contrast to the formation of pure martensite, folding processes in the crystal lattice and diffusion processes are coupled here, which makes various conversion mechanisms possible.

Alle in der Beschreibung und in den nachfolgenden Ansprüchen dargestellten Merkmale können dabei sowohl einzeln als auch in beliebiger Form miteinander kombiniert erfindungswesentlich sein.All features described in the description and in the following claims can be essential to the invention both individually and in any desired form.

Claims (11)

Dichtring, insbesondere ein Wellendichtring für einen Turbolader, der ein Grundmaterial auf Eisenbasis oder auf einer Nickelbasislegierung aufweist und boriert ist.Sealing ring, in particular a shaft seal for a turbocharger having an iron-based base material or on a nickel-based alloy and is borated. Dichtring nach Anspruch 1,
dadurch gekennzeichnet, - dass das Grundmaterial auf Eisenbasis zumindest teilweise austenitisch ist, oder - dass das Grundmaterial auf Eisenbasis zumindest teilweise ferritisch ist, oder - dass das Grundmaterial auf Eisenbasis zumindest teilweise perlitisch, bainitisch oder martensitisch ist. Sealing ring according to claim 1,
characterized, that the iron-based base material is at least partially austenitic, or that the iron-based base material is at least partially ferritic, or that the iron-based base material is at least partially pearlitic, bainitic or martensitic. Dichtring nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Grundmaterial zumindest eines der folgenden Elemente in der nachfolgend genannten Konzentration aufweist: - C:     0,0 - 0,9 9 Gew.-%, - Si     0,0 - 3,0 Gew.-%, - Mn     0,0 - 19,0 Gew.-%, - P, S, B     0,0 - 0,5 Gew.-%, - Cr     3,0 - 27,0 Gew.-%, - Mo     0,0 - 6,0 Gew.-%, - Ni     0,0 - 37,0 Gew.-%, - Al, Ti     0,0 - 6,0 Gew.-%, - N     0,0 - 0,5 Gew.-%, - Nb, V 0,0 - 2,5 Gew.-%, - W, Cu 0,0 - 3,0 Gew.-%, - Co     0,0 - 17,0 Gew.-%, - Fe     35,0 - 97,0 Gew.-, - sowie herstellungsbedingte Verunreinigungen anderer Elemente. Sealing ring according to claim 1 or 2,
characterized,
that the base material of at least one of the following elements has in of the following concentration: C: 0.0-0.9% by weight, Si 0.0-3.0% by weight, Mn 0.0-19.0% by weight, P, S, B 0.0-0.5% by weight, Cr 3.0-27.0% by weight, Mo 0.0-6.0 wt.%, Ni 0.0-37.0% by weight, Al, Ti 0.0-6.0 wt.%, N 0.0-0.5% by weight, Nb, V 0.0-2.5% by weight, W, Cu 0.0-3.0% by weight, Co 0.0-17.0% by weight, Fe 35.0-97.0 parts by weight, - as well as production-related contamination of other elements. Dichtring nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Grundmaterial zumindest eines der folgenden Elemente in der nachfolgend genannten Konzentration aufweist: - C     0,0 - 0,2 Gew.-%, - Si     0,0 - 2,0Gew.-%, - Mn 0,0 - 2,0 Gew.-%, - P, S, B     0,0 - 0,05 Gew.-%, - Al     0,0 - 0,4 Gew.-%, - Cr     13,0 - 17,0 Gew.-%, - Mo     1,0 - 2,0 Gew.-%, - Ni     23,5 - 27,5 Gew.-%, - Ti     1,0 - 3,0 Gew.-%, - V     0,0 - 1,0 Gew.-%, - Fe     45,0 - 62,5 Gew.-%, - sowie herstellungsbedingte Verunreinigungen anderer Elemente. Sealing ring according to claim 1 or 2,
characterized,
that the base material of at least one of the following elements has in of the following concentration: C 0.0-0.2% by weight, Si 0.0-2.0% by weight, Mn 0.0-2.0% by weight, P, S, B 0.0-0.05% by weight, Al 0.0-0.4% by weight, Cr 13.0-17.0% by weight, Mo 1.0-2.0% by weight, Ni 23.5-27.5% by weight, Ti 1.0-3.0% by weight, V 0.0-1.0% by weight, Fe 45.0-62.5% by weight, - as well as production-related contamination of other elements. Dichtring nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Grundmaterial zumindest eines der folgenden Elemente in der nachfolgend genannten Konzentration aufweist: - C     0,0 - 0,7 Gew.-%, - Si     0,0 - 1,0 Gew.-%, - Mn     5,0 - 10,0 Gew.-%, - P, S     0,0 - 0,5 Gew.-%, - Cr     14,0 - 23,0 Gew.-%, - Mo     0,0 - 5,0 Gew.-%, - Ni     0,0 - 15,0 Gew.-%, - Ti     0,0 - 0,5 Gew.-%, - N     0,0 - 0,5 Gew.-%, - Nb     0,0 - 1,3 Gew.-%, - V     0,0 - 1,2 Gew.-%, - W     0,0 - 1,0 Gew.-%, - B     0,0 - 0,1 Gew.-%, - Co     0,0 - 2,0 Gew.-%, - Cu     0,0 - 2,0 Gew.-%, - Fe     40,0 - 81,0 Gew.-%, - sowie herstellungsbedingte Verunreinigungen anderer Elemente. Sealing ring according to claim 1 or 2,
characterized,
that the base material of at least one of the following elements has in of the following concentration: C 0.0-0.7% by weight, Si 0.0-1.0% by weight, Mn 5.0-10.0% by weight, P, S 0.0-0.5% by weight, Cr 14.0-23.0 wt%, Mo 0.0-5.0% by weight, Ni 0.0-15.0% by weight, Ti 0.0-0.5% by weight, N 0.0-0.5% by weight, Nb 0.0-3.3% by weight, V 0.0-1.2% by weight, W 0.0-1.0% by weight, B 0.0-0.1% by weight, Co 0.0-2.0% by weight, Cu 0.0-2.0% by weight, Fe 40.0-81.0% by weight, - as well as production-related contamination of other elements. Dichtring nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Grundmaterial zumindest eines der folgenden Elemente in der nachfolgend genannten Konzentration aufweist: - C     0,5 - 1,8 Gew.-%, - Si     0,0 - 1,0 Gew.-%, - Mn     0,0 - 1,5 Gew.-%, - P, S     0,0 - 0,5 Gew.-%, - Cr, Mo     2,0 - 7,0 Gew.-%, - Ni, Co     0,0 - 15,0 Gew.-%, - Ti     0,0 - 0,5 Gew.-%, - Cu     0,0 - 2,0 Gew.-%, - N     0,0 - 0,3 Gew.-%, - Nb     0,0 - 1,5 Gew.-%, - V     0,5 - 3,0 Gew.-%, - W     2,0 - 9,0 Gew.-%, - B     0,0 - 0,1 Gew.-%, - Fe     40,0 - 93,5 Gew.-%, - sowie herstellungsbedingte Verunreinigungen anderer Elemente Sealing ring according to claim 1 or 2,
characterized,
that the base material of at least one of the following elements has in of the following concentration: C 0.5-1.8% by weight, Si 0.0-1.0% by weight, Mn 0.0-1.5% by weight, P, S 0.0-0.5% by weight, Cr, Mo 2.0-7.0 wt.%, Ni, Co 0.0-15.0% by weight, Ti 0.0-0.5% by weight, Cu 0.0-2.0% by weight, N 0.0-0.3% by weight, Nb 0.0-1.5% by weight, V 0.5-3.0% by weight, W 2.0 to 9.0% by weight, B 0.0-0.1% by weight, Fe 40.0-93.5% by weight, - as well as production-related contamination of other elements Dichtring nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass das Grundmaterial zumindest eines der folgenden Elemente in der nachfolgend genannten Konzentration aufweist: - C     0,0 - 2,7 Gew.-%, - Si     0,2 - 2,3 Gew.-%, - Mn     0,0 - 1,5 Gew.-%, - P, S     0,0 - 0,5 Gew.-%, - Cr     22,0 - 37,0 Gew.-%, - Mo, Cu     0,0 - 3,0 Gew.-%, - Ni     0,0 - 6,0 Gew.-%, - N, Ti     0,0 - 0,5 Gew.-%, - V, Nb     0,0 - 1,5 Gew.-%, - W, Co,     0,0 - 2,0 Gew.-%, - B     0,0 - 0,1 Gew.-%, - Fe     40,0 - 77,9 Gew.-%, - sowie herstellungsbedingte Verunreinigungen anderer Elemente Sealing ring according to claim 1 or 2,
characterized,
that the base material of at least one of the following elements has in of the following concentration: C 0.0-0.7% by weight, Si 0.2-2.3% by weight, Mn 0.0-1.5% by weight, P, S 0.0-0.5% by weight, Cr 22.0-37.0% by weight, Mo, Cu 0.0-3.0% by weight, Ni 0.0-6.0 wt.%, N, Ti 0.0-0.5% by weight, V, Nb 0.0-1.5% by weight, W, Co, 0.0-2.0% by weight, B 0.0-0.1% by weight, Fe 40.0-77.9% by weight, - as well as production-related contamination of other elements Dichtring nach Anspruch 1,
dadurch gekennzeichnet,
dass das Grundmaterial zumindest eines der folgenden Elemente in der nachfolgend genannten Konzentration aufweist: - C     0,0 - 0,2 Gew.-%, - Si     0,0 - 1,0 Gew.-%, - Mn     0,0 - 1,0 Gew.-%, - P, S, B     0, 0 - 0,5 Gew.-%, - Cr     8,0 - 31,0 Gew.-%, - Mo     0,0 - 15,0 Gew.-%, - Fe     0,0 - 36,0 Gew.-%, - Ti     0,0 - 5,0 Gew.-%, - N, La     0,0 - 0,5 Gew.-%, - Nb     0,0 - 5,5 Gew.-%, - V, Cu     0,0 - 2,0 Gew.-%, - Hf, Zr     0,0 - 2,0 Gew.-%, - W     0,0 - 14,0 Gew.-%, - Co     0,0 - 20,0 Gew.-%, - Ni     40,0 - 92,0 Gew.-%, - sowie herstellungsbedingte Verunreinigungen anderer Elemente Sealing ring according to claim 1,
characterized,
that the base material of at least one of the following elements has in of the following concentration: C 0.0-0.2% by weight, Si 0.0-1.0% by weight, Mn 0.0-1.0% by weight, P, S, B 0, 0-0.5% by weight, Cr 8.0-31.0% by weight, Mo 0.0-15.0% by weight, Fe 0.0-36.0% by weight, Ti 0.0-5.0% by weight, N, La 0.0-0.5% by weight, Nb 0.0-5.5% by weight, V, Cu 0.0-2.0% by weight, Hf, Zr 0.0-2.0% by weight, W 0.0-14.0% by weight, Co 0.0-20.0% by weight, Ni 40.0-92.0% by weight, - as well as production-related contamination of other elements Dichtring nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
dass eine Schichtdicke einer Borierschicht 1 bis 50µm beträgt.Sealing ring according to one of claims 1 to 8,
characterized,
that a layer thickness of 1 to 50 .mu.m is Borierschicht. Verfahren zum Herstellen eines Dichtrings nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, - dass zum Borieren feste, flüssige, insbesondere pastenartige, oder gasförmige Borspender verwendet werden, und/oder - dass das Grundmaterial des Dichtrings gesintert oder gegossen wird. Method for producing a sealing ring according to one of claims 1 to 9,
characterized, - That for Borieren solid, liquid, especially paste-like, or gaseous Borspender be used, and / or - That the base material of the sealing ring is sintered or cast. Verfahren nach Anspruch 10,
dadurch gekennzeichnet, - dass der Dichtring aus Stangenvollmaterial oder aus rohrförmigen Halbzeugen gedreht wird, oder - dass der Dichtring aus Draht gewickelt wird. Method according to claim 10,
characterized, - That the sealing ring is rotated from solid rod or tubular semi-finished, or - That the sealing ring is wound from wire.
EP08156343A 2007-06-01 2008-05-16 Gasket Withdrawn EP1997921A3 (en)

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