DE102012215668A1 - Sliding coating, useful in a functional part e.g. rolling bearing, comprises a fiber-reinforced matrix, and a filler whose particles are added in the matrix and comprises friction reducing properties, where filler comprises graphene - Google Patents

Sliding coating, useful in a functional part e.g. rolling bearing, comprises a fiber-reinforced matrix, and a filler whose particles are added in the matrix and comprises friction reducing properties, where filler comprises graphene Download PDF

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DE102012215668A1
DE102012215668A1 DE201210215668 DE102012215668A DE102012215668A1 DE 102012215668 A1 DE102012215668 A1 DE 102012215668A1 DE 201210215668 DE201210215668 DE 201210215668 DE 102012215668 A DE102012215668 A DE 102012215668A DE 102012215668 A1 DE102012215668 A1 DE 102012215668A1
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matrix
graphene
sliding
filler
fiber
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DE102012215668B4 (en
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Wolfgang Braun
Felix Hofbauer
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Schaeffler Technologies AG and Co KG
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M103/00—Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/02—Carbon; Graphite
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/128—Porous bearings, e.g. bushes of sintered alloy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • F16C33/145—Special methods of manufacture; Running-in of sintered porous bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
    • C10M2201/0413—Carbon; Graphite; Carbon black used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C10M2213/062—Polytetrafluoroethylene [PTFE]
    • C10M2213/0623—Polytetrafluoroethylene [PTFE] used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/077—Ionic Liquids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/14—Composite materials or sliding materials in which lubricants are integrally molded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/50—Lubricating properties
    • F16C2202/52—Graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
    • F16C2206/02—Carbon based material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/30—Fluoropolymers
    • F16C2208/32—Polytetrafluorethylene [PTFE]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/80—Thermosetting resins

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Ceramic Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sliding-Contact Bearings (AREA)
  • Lubricants (AREA)

Abstract

Sliding coating comprises a possibly fiber-reinforced matrix (1) made from a plastic such as thermosetting plastic and thermoplastic resin, or from a fiber-reinforced ceramic, and a filler whose particles are added in the matrix and comprises friction reducing properties. The filler comprises graphene.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft einen Gleitbelag nach dem Oberbegriff des Anspruchs 1 für ein Funktionsteil, insbesondere für ein Lagerteil eines Lagers. The invention relates to a sliding coating according to the preamble of claim 1 for a functional part, in particular for a bearing part of a bearing.

Aus der Praxis sind Lagerteile insbesondere von Wälzlagern oder Gleitlagern bekannt, bei denen an mindestens einem der beiden Lagerteile ein Gleitbelag vorgesehen ist, wobei der Gleitbelag, eine ggf. faserverstärkte Matrix aus insbesondere einem Kunststoff umfasst, speziell einen Duroplasten, einem Thermoplasten oder einem Harz, bzw. aus einer ggf. faserverstärkten Keramik, und einen Füllstoff, dessen Partikel in der Matrix aufgenommen sind, der reibungsreduzierende Eigenschaften aufweist. Als reibungsreduzierender Füllstoff für einen Gleitbelag ist beispielsweise Graphit bekannt, der selbstschmierende Eigenschaften aufweist, sobald der Graphit abgetragen wird, wodurch der Gleitbelag einen Verschleiß erleidet. Ebenso ist als reibungsreduzierender Füllstoff PTFE bekannt, der aber ein nur weicher Füllstoff ist und ebenfalls abgetragen wird, so dass ein Verschleiß des Gleitbelages auftritt. Der Verschleiß des Gleitbelages geht mit einem Materialabtrag einher, der die Funktionsdauer des Gleitbelages und damit des Funktionsteils, speziell des Lagerteils, das den Gleitbelag umfasst, begrenzt. From practice, bearing parts are known in particular of rolling bearings or plain bearings, in which a sliding coating is provided on at least one of the two bearing parts, wherein the sliding coating, optionally a fiber-reinforced matrix comprises in particular a plastic, especially a thermoset, a thermoplastic or a resin, or of a possibly fiber-reinforced ceramic, and a filler whose particles are received in the matrix having friction-reducing properties. As a friction-reducing filler for a sliding coating, for example, graphite is known, which has self-lubricating properties as soon as the graphite is removed, whereby the sliding coating suffers a wear. Also known as friction-reducing filler PTFE, but which is only a soft filler and is also removed, so that a wear of the sliding coating occurs. The wear of the sliding coating is accompanied by a material removal, which limits the functional life of the sliding coating and thus the functional part, especially the bearing part, which includes the sliding coating.

Aufgabe der ErfindungObject of the invention

Es ist die Aufgabe der Erfindung, einen Gleitbelag anzugeben, der eine möglichst geringe Reibung sowie einen möglichst geringen Verschleiß aufweist. It is the object of the invention to provide a sliding coating which has the lowest possible friction and the lowest possible wear.

Zusammenfassung der ErfindungSummary of the invention

Diese Aufgabe wird erfindungsgemäß für den eingangs genannten Gleitbelag dadurch gelöst, dass der Füllstoff Graphen umfasst. Graphen kann als einziger Füllstoff oder zusammen mit anderen Füllstoffen, wie Graphit oder PTFE, vorgesehen sein. This object is achieved according to the invention for the sliding coating mentioned above in that the filler comprises graphene. Graphene may be provided as a sole filler or together with other fillers, such as graphite or PTFE.

Graphen ist eine Kohlenstoffmodifikation, bei der eine ebene, zweidimensionale Struktur aus einem Gitter ausgebildet ist, bei der jedes Kohlenstoffatom mit genau drei Nachbarn kovalent verbunden ist, wobei zweidimensionale, ebene, sechseckige Waben ausgebildet sind. Graphen weist gegenüber Graphit einen deutlich höheren Elastizitätsmodul auf und eine sehr hohe Zugfestigkeit. Graphen-Lagen gleiten aufeinander nur mit sehr geringer Reibung, so dass der Graphen-Anteil in der Matrix des Gleitbelags die Reibung des Gleitbelags gegenüber einer Gegengleitfläche insgesamt herabsetzt und auch einen Materialabtrag durch Verschleiß deutlich reduziert. Graphene is a carbon modification in which a planar, two-dimensional structure is formed of a lattice in which each carbon atom is covalently linked to exactly three neighbors, forming two-dimensional, planar, hexagonal honeycombs. Graphene has a significantly higher modulus of elasticity than graphite and a very high tensile strength. Graphene layers slide on each other only with very little friction, so that the proportion of graphene in the matrix of the sliding lining reduces the friction of the sliding lining compared with a counter sliding surface as a whole and also significantly reduces material removal due to wear.

Vorzugsweise ist vorgesehen, dass Graphen in einer Suspension eines ionischen Fluids dem Gleitbelag beigemischt ist. Hinsichtlich der Zusammensetzung der Suspension ist vorzugsweise vorgesehen, dass das Mischungsverhältnis von dem ionischen Fluid zu dem Graphen in der Suspension ca. 10 zu 1 beträgt.Preferably, it is provided that graphene in a suspension of an ionic fluid is mixed with the sliding coating. With regard to the composition of the suspension, it is preferably provided that the mixing ratio of the ionic fluid to the graphene in the suspension is about 10 to 1.

Vorzugsweise ist vorgesehen, dass die Volumenkonzentration von Graphen zu der Gleitfläche hin zunimmt.It is preferably provided that the volume concentration of graphene increases towards the sliding surface.

Vorzugsweise ist vorgesehen, dass Graphen in einem Volumenanteil von ca. 0,1 Prozent bis ca. 10 Prozent in der Matrix vorliegt.Preferably, it is provided that graphene is present in a volume fraction of about 0.1 percent to about 10 percent in the matrix.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den abhängigen Ansprüchen sowie aus der Beschreibung eines Ausführungsbeispiels. Further advantages and features of the invention will become apparent from the dependent claims and from the description of an embodiment.

Die Erfindung wird im Folgenden unter Bezugnahme auf die anliegenden Zeichnungen näher beschrieben und erläutert. The invention will be described and explained in more detail below with reference to the accompanying drawings.

Kurze Beschreibung der Figuren Brief description of the figures

1 zeigt ausschnittsweise eine schematische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Gleitbelags für ein Ausführungsbeispiel eines als Lagerteil ausgebildeten erfindungsgemäßen Funktionsteils. 1 shows a detail of a schematic view of an embodiment of a sliding lining according to the invention for an embodiment of a part of the invention designed as a functional part.

Detaillierte Beschreibung der Figuren Detailed description of the figures

1 zeigt einen Gleitbelag, umfassend eine faserverstärkte Matrix 1 aus einem Kunststoff, insbesondere einem Thermoplasten, sowie einem Füllstoff, dessen Partikel in der Matrix 1 aufgenommen sind. 1 shows a sliding coating comprising a fiber reinforced matrix 1 from a plastic, in particular a thermoplastic, and a filler whose particles in the matrix 1 are included.

Als Füllstoff ist Graphen vorgesehen; wobei einer der oberflächennahen Partikel mit dem Bezugszeichen ‚2’ ausgewiesen ist. As a filler graphene is provided; wherein one of the near-surface particles is denoted by the reference numeral, 2 'is shown.

Die Graphen-Partikel 2 sind in einer Suspension in einem ionischen Fluid der Matrix 1 des Gleitbelags beigemischt, wobei diese Suspension auch in dem ausgehärteten Gleitbelag noch vorliegt, und wobei vorgesehen ist, dass das Mischungsverhältnis von dem ionischen Fluid zu dem Graphen in der Suspension ca. 10 zu 1 beträgt. The graphene particles 2 are in suspension in an ionic fluid of the matrix 1 of the sliding coating, wherein this suspension is still present in the cured sliding coating, and wherein it is provided that the mixing ratio of the ionic fluid to the graphene in the suspension is about 10 to 1.

Die Graphen-Partikel 2 liegen mit einem Volumenanteil von ca. 5 Volumen-Prozent, insbesondere von ca. 0,1 Prozent bis ca. 10 Prozent, in der Matrix 1 vor. The graphene particles 2 are in the matrix with a volume fraction of about 5 percent by volume, in particular from about 0.1 percent to about 10 percent 1 in front.

Graphen liegt insbesondere als im wesentlichen scheibenförmige Partikel 2 in der Matrix 1 vor, wobei die scheibenförmigen Partikel 2 im wesentlichen parallel zu einer Gleitfläche 3 des Gleitbelags ausgerichtet sind, und wobei die Gleitfläche 3 durch die Oberfläche des Gleitbelags gebildet ist. Innerhalb jedes scheibenförmigen Partikels 2 sind die einzelnen, zweidimensionalen Graphen-Lagen gestapelt, wobei die Lagen untereinander chemisch gebunden sind. Die Graphen-Partikel 2 bilden dabei flache Flocken aus, die im wesentlichen parallel zu der Gleitfläche 3 ausgerichtet sind, und zwar nicht nur, wie dargestellt, an der Gleitfläche 3, sondern auch in einem größeren Abstand von der Gleitfläche 3, also in die Tiefe der Matrix 1 des Gleitbelages. Bei der Herstellung des Gleitbelags wurde sichergestellt, dass die Volumenkonzentration von Graphen, speziell der scheibenförmigen Graphen-Partikel 2, zu der Gleitfläche 3 hin zunimmt.Graphene is in particular as substantially disc-shaped particles 2 in the matrix 1 before, the disc-shaped particles 2 substantially parallel to a sliding surface 3 the sliding lining are aligned, and wherein the sliding surface 3 is formed by the surface of the sliding coating. Within each disk-shaped particle 2 the individual, two-dimensional graphene layers are stacked, the layers being chemically bound together. The graphene particles 2 form flat flakes, which are substantially parallel to the sliding surface 3 aligned, not only, as shown, on the sliding surface 3 but also at a greater distance from the sliding surface 3 that is, into the depth of the matrix 1 of the sliding coating. In the production of the sliding coating, it was ensured that the volume concentration of graphene, especially the disk-shaped graphene particles 2 , to the sliding surface 3 increases.

Die im wesentlichen parallele Ausrichtung des Graphen, speziell der scheibenförmigen Graphen-Partikel 2, zu der Gleitfläche 3 der Matrix 1 des Gleitbelages lässt sich beispielsweise durch eine elektrostatische Aufladung bei der Eintragung der Graphen-Partikel in den Kunststoff erzielen. Auch kann vorgesehen sein, dass bei einem Aushärten der dünnen, der Gleitfläche 3 nahen Bereiche der Matrix 1 des Gleitbelags mechanische Spannungen auftreten, die eine bevorzugte Ausrichtung der oberflächennahen Graphen-Partikel 2 im wesentlichen parallel zu der Oberfläche der sich bildenden, erhärtenden Gleitbelag-Matrix bewirken.The substantially parallel alignment of the graphene, especially the disc-shaped graphene particles 2 , to the sliding surface 3 the matrix 1 The sliding coating can be achieved, for example, by electrostatic charging when the graphene particles are introduced into the plastic. It can also be provided that when curing the thin, the sliding surface 3 near areas of the matrix 1 of the sliding coating mechanical stresses occur, which is a preferred orientation of the near-surface graphene particles 2 cause substantially parallel to the surface of the forming, hardening sliding coating matrix.

Der dargestellte Gleitbelag ist als Komponente eines Funktionsteils, nämlich eines Lagerteils, speziell eines Gleitlagers bzw. eines Wälzlagers, vorgesehen. The sliding lining shown is provided as a component of a functional part, namely a bearing part, especially a plain bearing or a rolling bearing.

Im Betrieb wirkt die Gleitfläche 3 des Gleitbelags mit einer nicht dargestellten Gegengleitfläche zusammen, wobei die Gleiteigenschaften des Gleitbelages wesentlich durch die obersten, freigelegte zweidimensionalen Lagen der Graphen-Partikel 2 an der Gleitfläche bestimmt sind, wobei die zweidimensionale Graphen-Lage im wesentlichen mit vernachlässigbarer Reibung an der Gegengleitfläche gleitet. During operation, the sliding surface acts 3 the Gleitbelags with a Gegengleitfläche not shown together, wherein the sliding properties of the sliding coating substantially by the top, exposed two-dimensional layers of graphene particles 2 are determined on the sliding surface, wherein the two-dimensional graphene layer slides with substantially negligible friction on the mating sliding surface.

Die Erfindung wurde vorstehend anhand eines Ausführungsbeispiels näher beschrieben und erläutert, bei dem die Matrix des Gleitbelags ein Kunststoff, speziell ein mit nicht näher dargestellten Fasern verstärkter Thermoplast, war, in dem die Graphen-Partikel 2 als einziger Füllstoff, der reibungsreduzierende Eigenschaften aufweist, aufgenommen war. Es versteht sich, dass die ggf. faserverstärkte Matrix auch durch einen anderen Kunststoff, z. B. durch einen Duroplasten oder ein ausgehärtetes Harz wie ein ggf. faserverstärktes Phenol- oder Epoxidharz, ausgebildet sein kann. Es versteht sich weiter, dass anstelle eines Kunststoffs die den Gleitbelag bildende Matrix auch durch ein anorganisches Material, beispielsweise eine oxidische oder nicht-oxidische, in letzterem Fall speziell nitridische Keramik, ausgebildet sein kann, wobei die Keramik ggf. faserverstärkt vorliegt. Es versteht sich ebenfalls weiter, dass zusätzlich zu dem Graphen mindestens ein weiterer Füllstoff in der Matrix 1 aufgenommen sein kann, der ebenfalls reibungsreduzierende, ggf. selbstschmierende Eigenschaften aufweist. The invention has been described and explained in more detail above with reference to an embodiment in which the matrix of the sliding coating was a plastic, especially a thermoplastic reinforced with non-illustrated fibers, in which the graphene particles 2 was included as the only filler having friction reducing properties. It is understood that the optionally fiber-reinforced matrix by another plastic, eg. B. by a thermosetting resin or a cured resin such as an optionally fiber-reinforced phenolic or epoxy resin may be formed. It is further understood that instead of a plastic, the matrix forming the sliding coating can also be formed by an inorganic material, for example an oxidic or non-oxidic ceramic, in the latter case especially nitridic ceramic, the ceramic optionally being reinforced with fiber. It is also understood that in addition to the graphene, at least one further filler in the matrix 1 may be included, which also has friction-reducing, possibly self-lubricating properties.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Matrix matrix
22
Graphen-Partikel Graphene particles
33
Gleitfläche sliding surface

Claims (7)

Gleitbelag, umfassend eine ggf. faserverstärkte Matrix (1) aus insbesondere einem Kunststoff, speziell einen Duroplasten, einem Thermoplasten oder einem Harz, bzw. aus einer ggf. faserverstärkten Keramik, und einen Füllstoff, dessen Partikel (2) in der Matrix (1) aufgenommen sind, der reibungsreduzierende Eigenschaften aufweist, dadurch gekennzeichnet, dass der Füllstoff Graphen umfasst. Sliding layer comprising an optionally fiber-reinforced matrix ( 1 ) of in particular a plastic, especially a thermosetting plastic, a thermoplastic or a resin, or of a possibly fiber-reinforced ceramic, and a filler whose particles ( 2 ) in the matrix ( 1 ) having friction-reducing properties, characterized in that the filler comprises graphene. Gleitbelag nach Anspruch 1, dadurch gekennzeichnet, dass Graphen in einer Suspension eines ionischen Fluids dem Gleitbelag beigemischt ist. Slide lining according to claim 1, characterized in that graphene in a suspension of an ionic fluid is mixed with the sliding coating. Gleitbelag nach Anspruch 2, dadurch gekennzeichnet, dass das Mischungsverhältnis von dem ionischen Fluid zu dem Graphen in der Suspension ca. 10 zu 1 beträgt. Slide lining according to claim 2, characterized in that the mixing ratio of the ionic fluid to the graphene in the suspension is about 10 to 1. Gleitbelag nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Graphen als im wesentlichen scheibenförmige Partikel (2) in der Matrix (1) vorliegt, wobei die scheibenförmigen Partikel (2) im wesentlichen parallel zu einer Gleitfläche (3) des Gleitbelags ausgerichtet sind. Sliding lining according to one of claims 1 to 3, characterized in that the graphene as substantially disc-shaped particles ( 2 ) in the matrix ( 1 ), the disk-shaped particles ( 2 ) substantially parallel to a sliding surface ( 3 ) of the sliding lining are aligned. Gleitbelag nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass Graphen in einem Volumenanteil von ca. 0,1 Prozent bis ca. 10 Prozent in der Matrix (1) vorliegt. Slide lining according to one of claims 1 to 4, characterized in that graphene in a volume fraction of about 0.1 percent to about 10 percent in the matrix ( 1 ) is present. Gleitbelag nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Volumenkonzentration von Graphen zu der Gleitfläche (3) hin zunimmt. Slide lining according to one of claims 1 to 5, characterized in that the volume concentration of graphene to the sliding surface ( 3 ) increases. Funktionsteil, insbesondere Lagerteil eines Lagers, speziell eines Wälzlagers oder eines Gleitlagers, gekennzeichnet durch einen mindestens abschnittsweise vorgesehenen Gleitbelag nach einem der Ansprüche 1 bis 6.  Functional part, in particular bearing part of a bearing, especially a roller bearing or a plain bearing, characterized by an at least partially provided sliding lining according to one of claims 1 to 6.
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