EP0452189A1 - Lubrifiant pour surface en céramique et procédé de lubrification - Google Patents

Lubrifiant pour surface en céramique et procédé de lubrification Download PDF

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Publication number
EP0452189A1
EP0452189A1 EP91400876A EP91400876A EP0452189A1 EP 0452189 A1 EP0452189 A1 EP 0452189A1 EP 91400876 A EP91400876 A EP 91400876A EP 91400876 A EP91400876 A EP 91400876A EP 0452189 A1 EP0452189 A1 EP 0452189A1
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EP
European Patent Office
Prior art keywords
fluoride
binder
rare earth
ceramic
lubricating
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Withdrawn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
EP91400876A
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German (de)
English (en)
Inventor
Olivier Azema
Maurice Godet
Francis Platon
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.)
Rhodia Chimie SAS
Original Assignee
Rhone Poulenc Chimie SA
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Filing date
Publication date
Application filed by Rhone Poulenc Chimie SA filed Critical Rhone Poulenc Chimie SA
Publication of EP0452189A1 publication Critical patent/EP0452189A1/fr
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    • 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
    • C—CHEMISTRY; METALLURGY
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M3/00—Liquid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single liquid substances
    • C—CHEMISTRY; METALLURGY
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    • C10M103/06—Metal compounds
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    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/22—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehyde, ketonic, ether, ketal or acetal radical
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    • C10M107/22—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/28—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
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    • C10M2229/0545—Siloxanes with specific structure containing atoms other than silicon, hydrogen, oxygen or carbon containing phosphorus used as base material

Definitions

  • the present invention relates to a dry lubricant for ceramic / ceramic and metal / ceramic friction couple, and to a lubrication method.
  • the lubrication of moving parts is generally ensured by oils, greases loaded or not with particles.
  • the use of these lubricants is limited by the temperature of use.
  • lubrication of moving parts is generally ensured by inorganic temperature resistant materials such as graphite, calcium fluoride, molybdenum sulfide. This lubrication is dry lubrication of surfaces, as opposed to liquid lubrication used at low temperatures.
  • solid lubricants are introduced in the form of deposits of varying thickness on the surfaces subjected to friction. They are deposited either directly in the form of powder or in the form of a composition with an organic or inorganic binder.
  • the object of the invention is in particular to remedy these drawbacks by proposing a solid lubricant for surfaces, at least one of which in ceramic material which on the one hand forms a stable layer between the two surfaces to be lubricated and on the other hand provides a coefficient of very low friction especially in external conditions, in particular at very high temperature and under heavy load.
  • the invention provides a material for dry lubricating the contact between a first surface made of a first material and a second surface made of ceramic material.
  • This lubricant comprises as main component at least one rare earth fluoride.
  • rare earths is meant the elements of the lanthanide family having an atomic number ranging from 57 to 71, including the yttrium with atomic number 39.
  • cerium, lanthanum, neodymium and gadolinium fluorides mention may be made of cerium, lanthanum, neodymium and gadolinium fluorides.
  • the lubricant of the invention is arranged in the form of a layer or film on one of the surfaces to be lubricated.
  • the lubricant can be compacted.
  • the lubricant of the invention also comprises an inorganic or organic compound forming a binder in which the rare earth fluoride is dispersed.
  • organic binder resins such as polyquinoxileinic polymers, polybenzimidazoles, polyimides, acrylics, polyvinyls, acetates, phenolics, silicones, epoxides, polyamides, urethanes, polyvinyl butyrals or the like.
  • inorganic or inorganic binder suitable for the invention of compounds based on silicate or phosphate, such as sodium silicate, and sodium and / or potassium phosphate and / or aluminum.
  • the lubricant of the invention may also comprise various additives such as additives to improve the resistance to corrosion, to promote the application of the lubricant, dyes, wetting agents, fluxes or the like.
  • the contents of rare earth binder and fluoride are not critical. However, according to a preferred embodiment, the concentration by weight of rare earth fluoride in the lubricant is at least equal to 50%, preferably between 80% and 95%.
  • the first surface mentioned above may be of any material, however this material will advantageously be resistant to high temperatures such as a metallic material, of refractory type, for example an alloy based on nickel or cobalt, or ceramic such as ceramics. non-oxides (SiC, Si3N4, BN) and oxides (mullite, zirconia ).
  • the lubricant of the invention is particularly suitable for providing lubrication between two surfaces of ceramic material.
  • the nature of the ceramics is not critical and mention may be made, by way of example, of ceramics based on SiC, BN, Si3N4, zirconia, mullite or the like.
  • the lubricant placed between the surfaces of ceramic material ensures effective lubrication, in particular at high temperatures and under high load, the increase in temperature.
  • the lubricant is not removed and therefore allows suitable lubrication for a very long time (tens of hours).
  • the invention also relates to a method of lubricating the contact between two surfaces, at least one of which is made of ceramic material.
  • This method consists in interposing between the two surfaces to be lubricated a layer or a film of a lubricating material comprising at least one rare earth fluoride.
  • the rare earth has been defined previously as well as the preferred elements of the invention.
  • the lubricating material comprises an organic or inorganic binder in which the rare earth fluoride is dispersed.
  • organic or inorganic binders have been defined above, as have the preferred compositions for binding and rare earth fluoride.
  • the rare earth fluorides used are powders whose average particle diameter is preferably less than or equal to 50 ⁇ m.
  • the layer or film of lubricating material is deposited on one or both surfaces to be lubricated, before their installation.
  • the parts can be subjected to a heat treatment to evaporate any solvents contained in the binder.
  • a heat treatment can also be applied to the parts before their assembly to at least partially pyrolyze the binder of the lubricating material.
  • the lubricating material can be shaped to a desired shape, for example ring, washer, etc. by molding the composition, according to any usual method.
  • the lubricating material is applied to the surface of one of the materials, either by a plasma torch or by a flame torch.
  • the binder is not necessary.
  • Figures 4a and 4b respectively represent the variations of the applied load (F) and the coefficient of friction (K) as a function of time between a ceramic ring (SiC) and a metal ring with a lubricant CeF3 + binder 'Ex. 4) and,
  • FIGS. 5a and 5b respectively represent the variations of the applied load (F) and the coefficient of friction (K) as a function of time between ceramic rings (SiC) and a metal ring with a CeF3 lubricant + binder (Ex. 5) .
  • Lubrication tests of two ceramic parts 1, 2, one of which has a rotary movement in the defined direction, have been carried out by covering the face 3 of the part 1 with a lubricating material, for example by spreading the material over this area.
  • rings 4, 5 are placed in abutment on the surface of the ceramic part 1. They make it possible to define the filling volume and the compacting of the powders. These rings can be removed after depositing the lubricating material, advantageously after compacting this material.
  • the parts are then set in motion, for example by rotating part 2 at a speed of 0.1 m / s.
  • the drive torque is measured at different temperatures (20 ° C to 1000 ° C) necessary to drive part 2 in rotation. The measurement of this torque leads to the determination of the coefficient of friction (K). These measurements are performed for different loads applied to ceramic pieces 1 and 2.
  • Tests 1 and 2 clearly show that the materials introduced into the contact are not "trapped", since the value of the coefficient of friction is high after a short period of operation. This This phenomenon is highlighted on the curve of Figure 2, where the rapid increase in the value of the coefficient of friction (K) is to be linked to the start of the lubricant (examples 1 and 2).
  • the trapping of the lubricant in the contact can be improved by increasing the self-adhesion of the particles with each other and with the first bodies.
  • the CeF3 powder was treated with an organic binder (polyvinyl resin B74 from Monsanto) in a proportion of 5% by mass.

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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)

Abstract

La présente invention concerne un matériau pour lubrifier le contact entre une première surface 2 en céramique et une seconde surface 1 (céramique ou métal).
Ce matériau comprend un fluorure de terres rares et est déposé entre les surfaces à lubrifier, avantageusement par compactage.

Description

  • La présente invention concerne un lubrifiant à sec pour couple de frottement céramique/céramique et métal/céramique, et un procédé de lubrification.
  • La lubrification des pièces en mouvement est généralement assurée par des huiles, graisses chargées ou non en particules. Toutefois, l'utilisation de ces lubrifiants est limitée par la température d'utilisation.
  • Ainsi, pour les utilisations à haute température, lubrification des pièces en mouvement est généralement assurée par des matériaux inorganiques résistant à la température tels que le graphite, le fluorure de calcium, le sulfure de molybdène. Cette lubrification est une lubrification à sec des surfaces, par opposition à la lubrification liquide utilisée à basse température.
  • Ces lubrifiants solides sont introduits sous forme de dépôts d'épaisseur plus ou moins grande sur les surfaces soumises à des frottements. Ils sont déposés soit directement sous forme de poudre soit sous forme de composition avec un liant organique ou inorganique.
  • Toutefois, ces lubrifiants solides résistants aux températures élevées, introduits entre les surfaces frottantes ne permettent pas d'obtenir une lubrification convenable de cette surface. Ainsi, une couche de graphite déposée entre deux surfaces en céramique, mises en mouvement l'une par rapport à l'autre sera évacuée très rapidement. Ce phénomène a été vérifié avec de nombreux lubrifiants solides connus.
  • L'invention a notamment pour but de remédier à ces inconvénients en proposant un lubrifiant solide pour surfaces dont au moins une en matériau céramique qui d'une part forme une couche stable entre les deux surfaces à lubrifier et d'autre part procure un coefficient de frottement très bas notamment dans des conditions externes, en particulier à très haute température et sous forte charge.
  • A cet effet, l'invention propose un matériau pour lubrifier à sec le contact entre une première surface en un premier matériau et une seconde surface en matériau céramique. Ce lubrifiant comprend comme composant principal au moins un fluorure de terres rares.
  • Par terres rares, on entend les éléments de la famille des lanthanides ayant un numéro atomique allant de 57 à 71, y compris l'yttrium de numéro atomique 39.
  • Ainsi à titre d'exemple, on peut citer les fluorures de cérium, lanthane, néodyme, gadolinium.
  • Selon une caractéristique préférentielle de l'invention, le lubrifiant de l'invention est disposé sous forme de couche ou film sur une des surfaces à lubrifier. Avantageusement, le lubrifiant peut être compacté.
  • Selon une autre caractéristique de l'invention, le lubrifiant de l'invention comprend également un composé minéral ou organique formant un liant dans lequel est dispersé le fluorure de terres rares.
  • A titre d'exemple, on peut citer comme liant organique des résines telles que les polymères polyquinoxiléiniques, polybenzimidazoles, polyimides, acryliques, polyvinyliques, acétates, phénoliques, silicones, epoxydes, polyamides, uréthanes, polyvinyl butyrale ou analogues.
  • Egalement, à titre d'exemple on peut citer comme liant minéral ou inorganique convenable pour l'invention, des composés à base de silicate ou phosphate, tels que silicate de sodium, et phosphate de sodium et/ou de potassium et/ou aluminium.
  • Le lubrifiant de l'invention peut également comprendre différents additifs tels que des additifs pour améliorer la résistance à la corrosion, favoriser l'application du lubrifiant, colorants, agents mouillants, fondants ou analogues.
  • Les teneurs en liant et en fluorure de terres rares ne sont pas critiques. Toutefois, selon un mode de réalisation préféré, la concentration pondérale en fluorure de terres rares dans le lubrifiant est au moins égale à 50 %, de préférence entre 80 % et 95 %.
  • La première surface précitée ci-dessus peut être en un matériau quelconque, toutefois ce matériau sera avantageusement résistant aux températures élevées telles qu'un matériau métallique, de type réfractaire, par exemple un alliage à base de nickel ou cobalt, ou céramique comme les céramiques non oxydes (SiC, Si₃N₄, BN) et oxydes (mullite, zircone...).
  • Avantageusement, dans le mode de réalisation préféré de l'invention, le lubrifiant de l'invention est notamment convenable pour assurer la lubrification entre deux surfaces en matériau céramique.
  • La nature des céramiques n'est pas critique et on peut citer à titre d'exemple, les céramiques à base de SiC, BN, Si₃N₄, zircone, mullite ou analogues.
  • Ainsi, le lubrifiant disposé entre les surfaces en matériau en céramique assure une lubrification efficace notamment à des températures élevèes et sous forte charge l'augmentation de la température. De plus, le lubrifiant n'est pas évacué et donc permet une lubrification convenable pendant un temps très long (des dizaines d'heures).
  • En outre, comme les fluorures de terres rares sont stables à haute température, un bon niveau de lubrification est conservé même après une longue utilisation.
  • L'invention a également pour objet un procédé de lubrification du contact entre deux surfaces dont au moins l'une est en matériau céramique. Ce procédé consiste à interposer entre les deux surfaces à lubrifier une couche ou un film d'un matériau lubrifiant comprenant au moins un fluorure de terres rares.
  • La terre rare a été défini précédemment ainsi que les éléments préférés de l'invention.
  • Selon un mode de réalisation préféré de l'invention, le matériau lubrifiant comprend un liant organique ou inorganique dans lequel est dispersé le fluorure de terres rares.
  • Ces liants organiques ou inorganiques ont été définis ci-dessus, ainsi que les compositions préférées en liant et fluorure de terres rares.
  • Avantageusement, les fluorures de terres rares utilisés sont des poudres dont le diamètre moyen des particules est, de préférence inférieur, ou égal à 50 µm.
  • La couche ou le film de matériau lubrifiant est déposé sur une ou les deux surfaces à lubrifier, avant leur mise en place.
  • Les pièces peuvent être soumises à un traitement thermique pour évaporer les solvants éventuels contenus dans le liant.
  • Un traitement thermique peut être également appliqué aux pièces avant leur montage pour pyrolyser au moins partiellement le liant du matériau lubrifiant.
  • Il peut également être avantageux de compacter le film ou la couche de matériau lubrifiant avant la mise en mouvement des pièces.
  • Selon un autre mode de réalisation du procédé de l'invention, le matériau lubrifiant peut être conformé à une forme désirée, par exemple bague, rondelle, etc par moulage de la composition, selon tout procédé habituel.
  • Selon encore un autre mode de réalisation du procédé de l'invention, le matèriau lubrifiant est appliqué sur la surface de l'un des matériaux, soit par une torche plasma soit par un chalumeau à flamme. Ainsi, dans ce cas le liant n'est pas nécessaire.
  • D'autres buts, avantages et détails de l'invention apparaîtront plus clairement au vu de la description détaillée et dus exemples donnés ci-dessous uniquement à titre indicatif et au vu des figures annexées, dans lesquelles :
    • la figure 1 représente une vue schématique en coupe de deux pièces céramiques lubrifiées selon le procédé de l'invention
    • la figure 2 représente la variation du coefficient de frottement (K) en fonction du temps entre deux bagues en céramique SiC avec lubrifiant en graphite (Ex. 2).
    • la figure 3 représente la variation du coefficient de frottement (K) en fonction du temps entre deux bagues en céramique SiC avec lubrifiant CeF₃ + liant (Ex. 3).
  • Les figures 4a et 4b représentent respectivement les variations de la charge appliquée (F) et du coefficient de frottement (K) en fonction du temps entre une bague céramique (SiC) et une bague métallique avec un lubrifiant CeF₃ + liant 'Ex. 4) et,
  • les figures 5a et 5b représentent respectivement les variations de la charge appliquée (F) et du coefficient de frottement (K) en fonction du temps entre des bagues céramiques (SiC) et une bague métallique avec un lubrifiant CeF₃ + liant (Ex. 5).
  • Des essais de lubrification de deux pièces céramiques 1, 2 dont l'une est animée d'un mouvement rotatif selon le sens défini ont été réalisées en recouvrant la face 3 de la pièce 1 avec un matériau lubrifiant par exemple par étalement du matériau sur cette surface.
  • Dans le montage illustré, des bagues 4, 5 sont disposées en appui sur la surface de la pièce céramique 1. Elles permettent de délimiter le volume de remplissage et le compactage des poudres. Ces bagues peuvent être retirées après dépose du matériau lubrifiant, avantageusement après compactage de ce matériau.
  • Ainsi, avant la mise en mouvement des pièces, on applique une charge de 100 à 300 kg pour compacter le matériau lubrifiant étalé.
  • Les pièces sont ensuite mise en mouvement par exemple par mise en rotation de la pièce 2 selon une vitesse de 0,1 m / s.
  • Pour déterminer l'efficacité du matériau lubrifiant on mesure à différentes températures (20°C à 1000°C) le couple d'entraînement nécessaire pour entraîner en rotation la pièce 2. La mesure de ce couple conduit à la détermination du coefficient de frottement (K). Ces mesures sont effectuées pour différentes charges appliquées sur les pièces céramiques 1 et 2.
  • Les essais réalisés avec différents matériaux lubrifiants sont rassemblés dans le tableau I ci-dessous.
    Figure imgb0001
    • Conditions expérimentales :
    • Vitesse de glissement =
    0,1 m/s
    charge normale appliquée =
    1000 N
  • Les essais 1 et 2 montrent clairement que les matériaux introduits dans le contact ne sont pas "piégés", car la valeur du coefficient de frottement est élevée après une courte durée de fonctionnement. Ce phénomène est mis en évidence sur la courbe de la figure 2, où l'augmentation rapide de la valeur du coefficient de frottement (K) est à relier au départ du lubrifiant (exemples 1 et 2).
  • Au contraire, avec un matériau lubrifiant conforme à l'invention (exemples 3 et 4), le piégeage est permanent et conduit à une situation stable de fonctionnement (fig. 3) même lorsque la charge appliquée augmente (fig. 4) ou lorsque la température s'élève (fig. 5).
  • Le piégeage du lubrifiant dans le contact peut être amélioré en augmentant l'auto-adhérence des particules entre elles et avec les premiers corps. Pour les exemples 3 et 4, la poudre de CeF₃ a été traitée avec un liant organique (résine polyvinylique B74 de Monsanto) en proportion de 5 % en masse.
  • Des résultats similaires ont été observés avec des teneurs en liant de 10 % et 20 %, ainsi qu'avec une résine polyvinylique des poids moléculaire plus élevé.
  • Par ailleurs, un essai a été réalisé avec dépôt d'une couche de CeF₃ sur la surface d'une pièce métallique par projection par torche à plasma d'une poudre granulométrie 25-40 µm. Les coefficients de frottement entre cette pièce métallique et une piéce en céramique Sic ont été déterminés à différentes températures et sous des charges différentes.
  • Ainsi, il a été trouvé qu'à température ambiante le coefficient de frottement est élevé mais diminue rapidement quand la température s'élève et devient très faible à des températures supérieures à 500°C, même sous des charge élevées comprises par exemple entre 200 daN et 1000 daN, comme illustré à la figure 6a représentant la variation du coefficient de frottement K en fonction du temps et à la figure 6b représentant la variation de la charge appliquée F en daN en fonction du temps, la température de l'exprérience étant de 800°C.

Claims (19)

1/ Matériau solide pour lubrifier à sec le contact entre une première surface en un premier matériau et une seconde surface en céramique, caractérisé en ce qu'il comprend au moins un fluorure de terres rares.
2/ Matériau selon la revendication 1 caractérisé en ce qu'il comprend un fluorure de cérium, de lanthane, de néodyme, de gadolinium.
3/ Matériau selon la revendication 1 ou 2 caractérisé en ce que le fluorure de terre rare est compacté.
4/ Matériau selon la revendication 1 ou 2, caractérisé en ce que le fluorure de terre rare est appliqué sur une surface par torche à plasma ou chalumeau à flamme.
5/ Lubrifiant selon l'une des revendications 1 à 3 caractérisé en ce qu'il comprend un composé minéral ou organique formant liant.
6/ Matériau selon la revendication 5 caractérisé en ce que le composé formant liant est une résine organique choisie parmi le groupe comprenant des résines telles que les polymères polyquinoxiléiniques, polybenzimidazoles, polyimides, acryliques, polyvinyliques, acétates, phénoliques, silicones, epoxydes, polyamides, uréthanes.
7/ Matériau selon la revendication 5 carctérisé en ce que le composé formant liant est une résine minérale choisie parmi le groupe comprenant des composés à base de silicate ou phosphate.
8/ Matériau selon l'une des revendications précédentes caractérisé en ce que la première surface est dans un matériau choisi dans le groupe comprenant les matériaux métalliques de type réfractaire à base de nickel ou cobalt, les matériaux céramiques (choisi parmi des céramiques non oxydes (SiC, Si₃N₄, BN) et oxides (mullite, zircone).
9/ Matériau selon l'une des revendications précédentes caractérisé en ce que les deux surfaces sont en matériau céramique.
10/ Matériau selon l'une des revendications précédentes caractérisé en ce que le matériau céramique est choisi dans le groupe comprenant les céramiques à base de SiC, BN, Si₃ N₄, zircone, mullite.
11/ Procédé de lubrification à sec du contact entre deux surfaces dont l'une est en matériau céramique, caractérisé en ce qu'il consiste à interposer entre les deux surfaces à lubrifier une couche d'un matériau lubrifiant comprenant au moins un fluorure de terres rares.
12/ Procédé selon la revendication 11 caractérisé en ce que le matériau lubrifiant comprend un liant minéral ou organique dans lequel est dispersé au moins un fluorure de terre rare.
13/ Procédé selon la revendication 12, caractérisé eu ce que le fluorure de terres rares représente au moins 50 % en masse du matériau lubrifiant de préférence entre 80 % et 95 %.
14/ Procédé selon la revendication 12 ou 13 caractérisé en ce que le liant organique est choisi dans le groupe comprenant des résines telles que les polymères polyquinoxiléiniques, polybenzimidazoles, polyimides, acryliques, polyvinyliques, acétates phénoliques, silicones, epoxydes, polyamides, uréthanes.
15/ Procédé selon la revendication 12 caractérisé en ce que le liant minéral est une résine organique choisie dans le groupe comprenant des composés à base de silicate ou phosphate.
16/ Procédé selon la revendication 11, caractérisé en ce que le matériau lubrifiant est déposé sur une des surfaces à lubrifier par une torche plasma ou un chalumeau à flamme.
17/ Procédé selon l'une des revendications 11 à 16 caractérisé en ce que le fluorure de terres rares est un fluorure de cérium, fluorure de lanthane, fluorure de néodyme, fluorure de gadolinium.
18/ Procédé selon l'une des revendications 10 à 15 et 17 caractérisé en ce que la couche de matériau lubrifiant est compactée entre deux les surfaces à lubrifier.
19/ Procédé selon l'une des revendications 10 à 15 et 17 à 18 caractérisé en ce que la couche de matériau lubrifiant est compactée à une forme désirée, préalablement à sa disposition entre les surfaces à lubrifier.
EP91400876A 1990-04-13 1991-03-29 Lubrifiant pour surface en céramique et procédé de lubrification Withdrawn EP0452189A1 (fr)

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FR2684684A1 (fr) * 1991-12-06 1993-06-11 Rhone Poulenc Chimie Pieces denses autolubrifiantes en fluorures de terres rares frittes et leur procede d'obtention.
EP0882114A1 (fr) * 1995-09-28 1998-12-09 John Crane, Inc. Matiere composite carbonee pour applications tribologiques
NL1022223C2 (nl) * 2002-12-20 2004-06-22 Te Strake Surface Technology B Smeersysteem van het type vaste film dat geschikt is voor het bedekken van een metalen, keramisch of polymeer materiaal dat aan wrijving onderhevig is.
NL1022221C2 (nl) * 2002-12-20 2004-06-22 Te Strake Surface Technology B Smeersysteem van het type vaste film dat geschikt is voor het bedekken van een metalen, keramisch of polymeer materiaal dat aan wrijving onderhevig is.
NL1022222C2 (nl) * 2002-12-20 2004-06-22 Te Strake Surface Technology B Smeersysteem van het type vaste film dat geschikt is voor het bedekken van een metalen, keramisch of polymeer materiaal dat aan wrijving onderhevig is.
EP1431376A1 (fr) * 2002-12-20 2004-06-23 Te Strake Surface Technology B.V. Un lubrifiant sous forme de film solide utilisable comme couche sur un matériau metallique céramique ou polymérique à surface d usure
EP2127751A1 (fr) * 2008-05-19 2009-12-02 Roche Diagnostics GmbH Dispositif chauffant - refroidissant amélioré avec solide filme lubricante à sec

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2684684A1 (fr) * 1991-12-06 1993-06-11 Rhone Poulenc Chimie Pieces denses autolubrifiantes en fluorures de terres rares frittes et leur procede d'obtention.
EP0882114A1 (fr) * 1995-09-28 1998-12-09 John Crane, Inc. Matiere composite carbonee pour applications tribologiques
EP0882114A4 (fr) * 1995-09-28 1999-06-02 Crane John Inc Matiere composite carbonee pour applications tribologiques
NL1022223C2 (nl) * 2002-12-20 2004-06-22 Te Strake Surface Technology B Smeersysteem van het type vaste film dat geschikt is voor het bedekken van een metalen, keramisch of polymeer materiaal dat aan wrijving onderhevig is.
NL1022221C2 (nl) * 2002-12-20 2004-06-22 Te Strake Surface Technology B Smeersysteem van het type vaste film dat geschikt is voor het bedekken van een metalen, keramisch of polymeer materiaal dat aan wrijving onderhevig is.
NL1022222C2 (nl) * 2002-12-20 2004-06-22 Te Strake Surface Technology B Smeersysteem van het type vaste film dat geschikt is voor het bedekken van een metalen, keramisch of polymeer materiaal dat aan wrijving onderhevig is.
EP1431377A1 (fr) * 2002-12-20 2004-06-23 Te Strake Surface Technology B.V. Un lubrifiant sous forme de film solide utilisable comme couche sur un matériau métallique ou polymérique à surface d usure
EP1431376A1 (fr) * 2002-12-20 2004-06-23 Te Strake Surface Technology B.V. Un lubrifiant sous forme de film solide utilisable comme couche sur un matériau metallique céramique ou polymérique à surface d usure
EP1431378A1 (fr) * 2002-12-20 2004-06-23 Te Strake Surface Technology B.V. Un lubrifiant sous forme de film solide utilisable comme couche sur un matériau métallique, céramique ou polymérique à surface d'usure
EP2127751A1 (fr) * 2008-05-19 2009-12-02 Roche Diagnostics GmbH Dispositif chauffant - refroidissant amélioré avec solide filme lubricante à sec
US8438861B2 (en) 2008-05-19 2013-05-14 Herbert Harttig Cooler / heater arrangement

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KR910018524A (ko) 1991-11-30
CA2040356A1 (fr) 1991-10-14
IE911246A1 (en) 1991-10-23
PT97356A (pt) 1991-12-31
JPH04227688A (ja) 1992-08-17
FR2660930A1 (fr) 1991-10-18

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