CH509542A - Friction material - Google Patents

Friction material

Info

Publication number
CH509542A
CH509542A CH982469A CH982469A CH509542A CH 509542 A CH509542 A CH 509542A CH 982469 A CH982469 A CH 982469A CH 982469 A CH982469 A CH 982469A CH 509542 A CH509542 A CH 509542A
Authority
CH
Switzerland
Prior art keywords
sep
oxide
friction material
friction
mixture
Prior art date
Application number
CH982469A
Other languages
French (fr)
Inventor
Blouet Jean
Courcier Francois
Courtel Robert
Gras Rene
Risler Francis
Original Assignee
Commissariat Energie Atomique
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Commissariat Energie Atomique filed Critical Commissariat Energie Atomique
Publication of CH509542A publication Critical patent/CH509542A/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/12—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on chromium oxide
    • 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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/002—Traction fluids
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating 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
    • 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
    • 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
    • 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
    • C10M2201/042—Carbon; Graphite; Carbon black halogenated, i.e. graphite fluoride
    • 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
    • C10M2201/06—Metal compounds
    • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
    • 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
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
    • 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
    • C10M2201/08—Inorganic acids or salts thereof
    • 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
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/081—Inorganic acids or salts thereof containing halogen
    • 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
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/082—Inorganic acids or salts thereof containing nitrogen
    • 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
    • C10M2201/08—Inorganic acids or salts thereof
    • C10M2201/084—Inorganic acids or salts thereof containing sulfur, selenium or tellurium
    • 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
    • C10N2030/32—Light or X-ray resistance
    • 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
    • C10N2050/08—Solids
    • 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
    • C10N2050/10—Semi-solids; greasy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Metallurgy (AREA)
  • Lubricants (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Physical Vapour Deposition (AREA)
  • Sliding-Contact Bearings (AREA)
  • Braking Arrangements (AREA)

Description

  

  
 



  Matériau de frottement
 La présente invention est relative à un matériau de frottement, notamment à sec, plus spécialement adapté à constituer un revêtement de surface de pièces en mouvement relatif.



   On sait que certaines   ambiances    particulières, telles que des ambiances à haute température, en milieu nucléaire, en atmosphère corrosive, sous vide, etc., peuvent nécessiter l'utilisation d'appareillages ou de mécanismes réalisés avec des pièces en matériaux spéciaux.



  On sait également que les   ambiances    dans lesquelles sont amenés à travailler ces appareils ne permettent pas, dans la plupart des cas, l'utilisation de lubrifiants classiques.



   La présente invention a pour objet un matériau répondant aux Impératifs ci-dessus, en permettant le frottement à sec de pièces avec une réduction notable de leur usure et une diminution importante des risques de grippage.



   A cet effet, ce matériau se caractérise en ce qu'il est constitué par un mélange contenant au moins de l'oxyde de chrome et de l'oxyde de zirconium. De préférence, le pourcentage d'oxyde de zirconium dans le mélange initial est compris entre 5 et 25    /o .   



   Une diminution du pourcentage pondéral de l'oxyde de zirconium conduit à une augmentation de l'usure et du coefficient de frottement. De même, une augmentation trop importante du pourcentage pondéral de l'oxyde de zirconium conduit aussi aux mêmes inconvénients.



  Toutefois, dans les   limites    pondérales ci-dessus mentionnées, l'expérience montre que   l'on    obtient de plus grandes stabilité et régularité du coefficient de   frotte-    ment avec les plus forts pourcentages en oxyde de zirconium. Ce matériau se prête fort bien à l'adjonction de composants supplémentaires ayant des effets connus en matière de lubrification tels que le   graphi,te,    le bisulfure de molybdène, le fluorure de calcium ou de baryum, in   corporés    ultérieurement au matériau. Par ailleurs, il a été constaté expérimentalement qu'une amélioration des qualités du matériau de frottement pourrait être réalisée par l'adjonction d'au moins un troisième oxyde au mélange d'oxyde de chrome et de zirconium. Avantageusement, ce troisième oxyde est de l'oxyde de néodyme.



   La mise en oeuvre du matériau de frottement considéré peut se faire sous deux formes, soit sous forme de pièce massive, soit sous forme de revêtement. Dans le premier cas, on peut faire appel à toutes les techniques de la métallurgie des poudres pour réaliser de telles pièces massives. Dans le second cas, il est possible de faire appel aux techniques de revêtement d'oxyde ou aux techniques de revêtements métalliques ensuite oxydés.



  En particulier, il est intéressant d'utiliser les techniques de projection au chalumeau ordinaire ou au chalumeau à plasma. On peut se servir de chalumeaux alimentés en poudre et en baguettes, les oxydes étant préalablement mélangés ou étant coprojetés. On peut également alimenter le chalumeau à plasma par des oxydes purs ou en mélange. Ainsi, notamment, on peut effectuer le dépôt d'une couche mince du mélange d'oxyde sur la pièce à revêtir par projection au chalumeau à plasma d'une poudre fine dont la granulométrie est comprise entre 10 et 40 microns avec un débit de 50 I/mn d'argon et une puissance de 21 kW (700 à 30V).



   On donne ci-après à titre indicatif un tableau récapitulant quelques essais effectués sur des pièces et notamment sur un tourillon monté à l'intérieur d'un corps de palier, le matériau constituant ces pièces étant ou non muni d'un revêtement de surface selon l'invention.



   A titre d'illustration, la figure unique du dessin annexé se rapporte à des essais de revêtements continus de mélanges d'oxyde de chrome et de zirconium, en proportions variables. Les courbes tracées sont relatives à l'usure et au coefficient de frottement à l'air ambiant d'un tourillon en acier nitruré, revêtu d'un mélange d'oxyde de chrome et de zirconium d'une épaisseur de     Résultats d'essais effectués dans les conditions suivantes:

  : - Frottement sec, charge de 30 decanewtons, vitesse linéare 0, 14 m/s   
EMI2.1     


Nature <SEP> du <SEP> matériau <SEP> Nature <SEP> du <SEP> maté <SEP> - <SEP> Coefficient <SEP> de <SEP> Durée <SEP> de <SEP> Perte <SEP> de <SEP> poids <SEP> Perte <SEP> de <SEP> poids <SEP> Observa
 <SEP> constituant <SEP> le <SEP> riau <SEP> constituant <SEP> frottement <SEP> l'essai <SEP> totale <SEP> durant <SEP> totale <SEP> durant <SEP> tions
<tb>  <SEP> tourillon <SEP> le <SEP> corps <SEP> de <SEP> en <SEP> heures <SEP> l'essai <SEP> du <SEP> tou- <SEP> lessai <SEP> du
<tb>  <SEP> palier <SEP> rillon,

   <SEP> en <SEP> corps <SEP> de <SEP> palier
<tb>  <SEP> gramme <SEP> en <SEP> gramme
<tb> Acier <SEP> inox <SEP> Acier <SEP> inox <SEP> 0,9 <SEP> 0 <SEP> h <SEP> 32 <SEP> mn <SEP> 1,45 <SEP> 0,13 <SEP> Grippage
<tb>  <SEP> violent
<tb> Acier <SEP> inox <SEP> Acier <SEP> inox <SEP> 0,85 <SEP> 0 <SEP> h <SEP> 45 <SEP> mn <SEP> 1,52 <SEP> 0,011 <SEP> Usure
<tb> chromé <SEP> chromé <SEP> très
<tb>  <SEP> rapide <SEP> du
<tb>  <SEP> tourillon
<tb>  <SEP> 0,3 <SEP> 46 <SEP> h <SEP> 0,06 <SEP> 0,07 <SEP> Usure <SEP> et
<tb> Cr2O3 <SEP> Cr2O3 <SEP> grippage
<tb>  <SEP> rapide
<tb> ZrO2 <SEP> ZrO2 <SEP> 1 <SEP> 0 <SEP> h <SEP> 1mn <SEP> 0,30 <SEP> 0,07 <SEP> Grippage
<tb> Mélange
<tb> Cr203-Zr02 <SEP> (15 <SEP> %) <SEP> Cr23 <SEP> 0,25 <SEP> 400 <SEP> h <SEP> 0,04 <SEP> 0,04 <SEP> Usure
<tb>  <SEP> très
<tb>  <SEP> faible
<tb>      En outre,

   on a obtenu sur un frictiographe à haute température sous vide les résultats suivants:   
EMI3.1     


Couple <SEP> de <SEP> matériaux <SEP> Charge <SEP> Vitesse <SEP> m/sec <SEP> Ambiance <SEP> Durée <SEP> de <SEP> l'essai <SEP> Coef. <SEP> de <SEP> Observations
<tb>  <SEP> frottement
<tb> Cr203 <SEP> + <SEP> Zr <SEP> 02/Cr203 <SEP> 500 <SEP> Newtons <SEP> 0,14 <SEP> 3.10-5torr
<tb>  <SEP> à <SEP> 500 C <SEP> 1h. <SEP> 0,8 <SEP> Coefficient
<tb>  <SEP> de <SEP> frotts
 <SEP> ment <SEP> très
<tb>  <SEP> stable <SEP> - <SEP> peu
<tb>  <SEP> d'usure <SEP> 
 <SEP> grippage <SEP> nul
<tb>    2/10 mm,    sur un corps de palier en même acier, revêtu d'oxyde de chrome pur.

 

   Les pièces sont mises en contact et chargées avant le démarrage de la machine. La machine est arrêtée 3 heures après sa mise en route. Le tourillon et le corps de palier restent en contact et en charge pendant 1 heure.



  A l'issue de ce délai, la machine est remise en route pour un nouveau cycle de 4 heures 30. 



  
 



  Friction material
 The present invention relates to a friction material, in particular dry, more especially suitable for forming a surface coating of parts in relative movement.



   It is known that certain particular environments, such as high temperature environments, in a nuclear environment, in a corrosive atmosphere, under vacuum, etc., may require the use of equipment or mechanisms made with parts made of special materials.



  It is also known that the environments in which these devices are required to work do not, in most cases, allow the use of conventional lubricants.



   The present invention relates to a material meeting the above requirements, by allowing the parts to be rubbed dry with a significant reduction in their wear and a significant reduction in the risks of seizing.



   To this end, this material is characterized in that it consists of a mixture containing at least chromium oxide and zirconium oxide. Preferably, the percentage of zirconium oxide in the initial mixture is between 5 and 25%.



   A decrease in the weight percentage of zirconium oxide leads to an increase in wear and in the coefficient of friction. Likewise, an excessively large increase in the weight percentage of zirconium oxide also leads to the same drawbacks.



  However, within the weight limits mentioned above, experience shows that greater stability and regularity of the coefficient of friction are obtained with the highest percentages of zirconium oxide. This material lends itself very well to the addition of additional components having known effects in terms of lubrication, such as graphite, molybdenum disulphide, calcium or barium fluoride, subsequently incorporated into the material. Furthermore, it has been observed experimentally that an improvement in the qualities of the friction material could be achieved by adding at least a third oxide to the mixture of chromium oxide and zirconium. Advantageously, this third oxide is neodymium oxide.



   The implementation of the friction material considered can be done in two forms, either in the form of a solid part, or in the form of a coating. In the first case, we can use all the techniques of powder metallurgy to produce such massive parts. In the second case, it is possible to use the techniques of oxide coating or the techniques of metallic coatings then oxidized.



  In particular, it is advantageous to use the techniques of spraying with an ordinary torch or with a plasma torch. It is possible to use torches supplied with powder and rods, the oxides being previously mixed or being co-projected. It is also possible to supply the plasma torch with pure oxides or as a mixture. Thus, in particular, it is possible to deposit a thin layer of the oxide mixture on the part to be coated by spraying with a plasma torch of a fine powder whose particle size is between 10 and 40 microns with a flow rate of 50. I / min of argon and a power of 21 kW (700 to 30V).



   A table summarizing some tests carried out on parts and in particular on a journal mounted inside a bearing body, the material constituting these parts being or not provided with a surface coating according to invention.



   By way of illustration, the single figure of the appended drawing relates to tests of continuous coatings of mixtures of chromium and zirconium oxide, in variable proportions. The plotted curves relate to the wear and to the coefficient of friction in ambient air of a nitrided steel journal, coated with a mixture of chromium oxide and zirconium with a thickness of under the following conditions:

  : - Dry friction, load of 30 decanewtons, linear speed 0.14 m / s
EMI2.1


Nature <SEP> of <SEP> material <SEP> Nature <SEP> of <SEP> maté <SEP> - <SEP> Coefficient <SEP> of <SEP> Duration <SEP> of <SEP> Loss <SEP> of < SEP> weight <SEP> Loss <SEP> of <SEP> weight <SEP> Observa
 <SEP> constituting <SEP> the <SEP> line <SEP> constituting <SEP> friction <SEP> the test <SEP> total <SEP> during <SEP> total <SEP> during <SEP>
<tb> <SEP> journal <SEP> the <SEP> body <SEP> of <SEP> in <SEP> hours <SEP> test <SEP> of <SEP> all <SEP> test <SEP> of
<tb> <SEP> level <SEP> rillon,

   <SEP> in <SEP> body <SEP> of <SEP> bearing
<tb> <SEP> gram <SEP> in <SEP> gram
<tb> Stainless steel <SEP> <SEP> Stainless steel <SEP> <SEP> 0.9 <SEP> 0 <SEP> h <SEP> 32 <SEP> mn <SEP> 1.45 <SEP> 0.13 <SEP> Seizure
violent <tb> <SEP>
<tb> Stainless steel <SEP> <SEP> Stainless steel <SEP> <SEP> 0.85 <SEP> 0 <SEP> h <SEP> 45 <SEP> mn <SEP> 1.52 <SEP> 0.011 <SEP > Wear
<tb> chrome <SEP> chrome <SEP> very
<tb> <SEP> fast <SEP> from
<tb> <SEP> journal
<tb> <SEP> 0.3 <SEP> 46 <SEP> h <SEP> 0.06 <SEP> 0.07 <SEP> Wear <SEP> and
<tb> Cr2O3 <SEP> Cr2O3 <SEP> seizure
<tb> <SEP> fast
<tb> ZrO2 <SEP> ZrO2 <SEP> 1 <SEP> 0 <SEP> h <SEP> 1mn <SEP> 0.30 <SEP> 0.07 <SEP> Seizure
<tb> Mixture
<tb> Cr203-Zr02 <SEP> (15 <SEP>%) <SEP> Cr23 <SEP> 0.25 <SEP> 400 <SEP> h <SEP> 0.04 <SEP> 0.04 <SEP> Wear
<tb> <SEP> very
<tb> <SEP> low
<tb> In addition,

   the following results were obtained on a high temperature vacuum frictiograph:
EMI3.1


Torque <SEP> of <SEP> materials <SEP> Load <SEP> Speed <SEP> m / sec <SEP> Ambience <SEP> Duration <SEP> of <SEP> test <SEP> Coef. <SEP> of <SEP> Observations
<tb> <SEP> friction
<tb> Cr203 <SEP> + <SEP> Zr <SEP> 02 / Cr203 <SEP> 500 <SEP> Newtons <SEP> 0.14 <SEP> 3.10-5torr
<tb> <SEP> to <SEP> 500 C <SEP> 1h. <SEP> 0.8 <SEP> Coefficient
<tb> <SEP> from <SEP> frotts
 <SEP> ment <SEP> very
<tb> <SEP> stable <SEP> - <SEP> little
<tb> <SEP> wear <SEP>
 <SEP> seizure null <SEP>
<tb> 2/10 mm, on a bearing body in the same steel, coated with pure chromium oxide.

 

   The parts are contacted and loaded before the machine is started. The machine is stopped 3 hours after it is started. The journal and the bearing housing remain in contact and under load for 1 hour.



  At the end of this period, the machine is restarted for a new cycle of 4.5 hours.

Claims (1)

REVENDICATION CLAIM Matériau de frottement, caractérisé en ce qu'il est constitué par un mélange contenant au moins de l'oxyde de chrome et de l'oxyde de zirconium. Friction material, characterized in that it consists of a mixture containing at least chromium oxide and zirconium oxide. SOUS-REVENDICATIONS 1. Matériau de frottement selon la revendication, caractérisé en ce que le pourcentage d'oxyde de zirconium dans le mélange est compris entre 5 et 25 % 2. Matériau de frottement selon la revendication, caractérisé en ce qu'il comporte au moins un troisième oxyde. SUB-CLAIMS 1. Friction material according to claim, characterized in that the percentage of zirconium oxide in the mixture is between 5 and 25% 2. Friction material according to claim, characterized in that it comprises at least a third oxide. 3. Matériau de frottement selon la sous-revendication 2, caractérisé en ce que le troisième oxyde est de l'oxyde de néodyme. 3. A friction material according to sub-claim 2, characterized in that the third oxide is neodymium oxide. 4. Matériau de frottement selon la revendication, caractérisé en ce qu'il comporte en outre au moins un des composants additionnels suivants: le graphite, le bisulfure de molybdène, le fluorure de calcium ou de baryum. 4. Friction material according to claim, characterized in that it further comprises at least one of the following additional components: graphite, molybdenum disulphide, calcium fluoride or barium.
CH982469A 1968-06-27 1969-06-26 Friction material CH509542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR156772 1968-06-27

Publications (1)

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CH509542A true CH509542A (en) 1971-06-30

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ID=8651713

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CH982469A CH509542A (en) 1968-06-27 1969-06-26 Friction material

Country Status (10)

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JP (1) JPS4833308B1 (en)
BE (1) BE732720A (en)
CH (1) CH509542A (en)
DE (1) DE1932676A1 (en)
ES (1) ES368832A1 (en)
FR (1) FR1587621A (en)
GB (1) GB1218906A (en)
LU (1) LU58903A1 (en)
NL (1) NL6909510A (en)
SE (1) SE340727B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340407A2 (en) * 1988-05-04 1989-11-08 HERMANN BERSTORFF Maschinenbau GmbH Planetary roller extruder for compounding and extruding plastic masses

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307726C2 (en) * 1983-03-04 1986-04-24 Franz Klaus Union Armaturen, Pumpen Gmbh & Co, 4630 Bochum Runner and bearing of a pump
FR2651248B1 (en) * 1989-08-31 1993-07-16 Renault
DE4427264C2 (en) * 1994-07-30 1996-09-26 Mtu Muenchen Gmbh Brushing surface for engine components and method for its production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340407A2 (en) * 1988-05-04 1989-11-08 HERMANN BERSTORFF Maschinenbau GmbH Planetary roller extruder for compounding and extruding plastic masses
EP0340407A3 (en) * 1988-05-04 1990-10-24 Hermann Berstorff Maschinenbau Gmbh Planetary roller extruder for compounding and extruding plastic masses

Also Published As

Publication number Publication date
JPS4833308B1 (en) 1973-10-13
GB1218906A (en) 1971-01-13
LU58903A1 (en) 1969-11-12
FR1587621A (en) 1970-03-27
SE340727B (en) 1971-11-29
DE1932676A1 (en) 1970-02-12
ES368832A1 (en) 1971-05-16
BE732720A (en) 1969-10-16
NL6909510A (en) 1969-12-30

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