EP0237376A1 - Wolframkarbid-Kobalt-Verbundwerkstoff mit verbesserten Reibungseigenschaften - Google Patents

Wolframkarbid-Kobalt-Verbundwerkstoff mit verbesserten Reibungseigenschaften Download PDF

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Publication number
EP0237376A1
EP0237376A1 EP87400255A EP87400255A EP0237376A1 EP 0237376 A1 EP0237376 A1 EP 0237376A1 EP 87400255 A EP87400255 A EP 87400255A EP 87400255 A EP87400255 A EP 87400255A EP 0237376 A1 EP0237376 A1 EP 0237376A1
Authority
EP
European Patent Office
Prior art keywords
tungsten carbide
cobalt
layers
atoms
friction
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.)
Granted
Application number
EP87400255A
Other languages
English (en)
French (fr)
Other versions
EP0237376B1 (de
Inventor
Michel Cartier
Bertrand Loichon
Jean-Paul Farjaudon
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.)
Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
Original Assignee
Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
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 Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA filed Critical Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
Publication of EP0237376A1 publication Critical patent/EP0237376A1/de
Application granted granted Critical
Publication of EP0237376B1 publication Critical patent/EP0237376B1/de
Expired 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
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides

Definitions

  • the invention relates to a ceramic metal composite layer with improved friction properties comprising tungsten carbide and cobalt.
  • Ceramics and ceramic / metal composites or cermets have intrinsic properties of hardness, resistance to high temperatures, chemical inertness, which make them desirable for certain mechanical fields (bearings, stops, packing) and especially when the temperatures of use provided (thermal engine cylinders for example) or the environment (abrasive atmospheres) discard conventional solutions such as the use of corrosion-resistant and suitably lubricated metals.
  • Ceramics and cermets generally have under the intended conditions of use (dry friction or under random lubrication) friction coefficients much greater than 0.1, maximum value acceptable for a number of applications, higher values resulting in overheating excessive due to the energy density involved, or more simply by high losses, which cancel out the advantages expected from working at high temperature for example.
  • the invention provides a ceramic metal composite layer with improved friction properties, comprising tungsten carbide and cobalt, characterized in that it comprises free carbon, its relative composition being from 30 to 50 free carbon atoms, from 3 to 12 cobalt atoms, and tungsten carbide molecules to complete a hundred.
  • the cobalt content is between 3 and 7 atoms per hundred particles, atoms or molecules.
  • the layers were obtained by a process derived from the conventional preparation of the layers of tungsten carbide / cobalt composite by spraying in an arc plasma, and that the carbon present in the free state in the layers comes at least mostly from thermal decomposition of tungsten carbide.
  • the friction tests were carried out on a tribometer machine, where a rotating ring is applied to an opposing plate under a determined load, the speed of rotation of the ring being adjusted so that the linear sliding speed is 0.5 m / s.
  • the cobalt content expressed in number of atoms per 100 particles, is plotted on the abscissa and a tribological performance value, expressed in arbitrary units, proportional to the rubbing contact pressure threshold which produces irreparable degradations of the layer is plotted on the ordinate. .
  • Optimal performance occurs for a cobalt content of approximately 4 to 5 cobalt atoms per cent, i.e. for a content where, in the absence of carbon, the layers are clearly affected by wear. mechanical (due to sensitivity to mechanical and thermal stresses).
  • composition of the sample of invention I was Co 4 atoms per cent, C 50 atoms per cent. Comparative tests were carried out with coatings of compositions situated outside the scope of the invention.
  • Sample I has a coefficient of friction of approximately 0.1 for a load of 100 newtons to drop to 0.07 under 400 N and 0.06 under 1000 N.
  • sample II presents under 100 N a coefficient of friction of 0.15, which increases more than linearly with the load to reach 0.18 under 500 N.
  • Sample III has, under 100 N a coefficient of friction of 0.2 which increases very quickly with the load, exceeding 0.4 under 200 N.
  • the rotating ring was, in all cases, of the same composition as sample I.
  • Test IV focused on a wafer provided with a coating of the same composition as the ring.
  • Test V focused on a steel plate covered with a coating of titanium nitride.
  • Test VII on a sintered alumina plate.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Sliding-Contact Bearings (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Lubricants (AREA)
  • Laminated Bodies (AREA)
EP19870400255 1986-02-07 1987-02-04 Wolframkarbid-Kobalt-Verbundwerkstoff mit verbesserten Reibungseigenschaften Expired EP0237376B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8601676A FR2594143B1 (fr) 1986-02-07 1986-02-07 Composite carbure de tungstene/cobalt a proprietes frottantes ameliorees
FR8601676 1986-02-07

Publications (2)

Publication Number Publication Date
EP0237376A1 true EP0237376A1 (de) 1987-09-16
EP0237376B1 EP0237376B1 (de) 1989-12-13

Family

ID=9331896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870400255 Expired EP0237376B1 (de) 1986-02-07 1987-02-04 Wolframkarbid-Kobalt-Verbundwerkstoff mit verbesserten Reibungseigenschaften

Country Status (5)

Country Link
EP (1) EP0237376B1 (de)
DE (1) DE3761149D1 (de)
ES (1) ES2011803B3 (de)
FR (1) FR2594143B1 (de)
IE (1) IE59541B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003098042A1 (en) * 2002-05-15 2003-11-27 Kennametal Inc. Waer ring for a concrete pump
US7841811B2 (en) 2003-02-19 2010-11-30 Kennametal Inc. Indexable cutting tool
CN110062861A (zh) * 2016-12-07 2019-07-26 H.E.F.公司 摩擦片、包括这种摩擦片的机械系统和实施方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671382B1 (fr) * 1991-01-07 1994-12-23 Jaeger Garniture mecanique d'etancheite pour arbre tournant de pompe a eau pour automobile.
US7070363B2 (en) 2004-07-15 2006-07-04 Kennametal Inc. Cutting insert for high-speed milling cutter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2117731A2 (de) * 1967-10-11 1972-07-28 Anvar

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2117731A2 (de) * 1967-10-11 1972-07-28 Anvar

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 79, no. 10, 19 novembre 1973, page 149, résumé no. 117819w, Columbus, Ohio, US; & JP-A-72 40 613 (SUWA SEIKOSHA CO. LTD) 14-10-1972 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003098042A1 (en) * 2002-05-15 2003-11-27 Kennametal Inc. Waer ring for a concrete pump
US6857861B2 (en) 2002-05-15 2005-02-22 Kennametal Inc. Ring for concrete pump
US7841811B2 (en) 2003-02-19 2010-11-30 Kennametal Inc. Indexable cutting tool
CN110062861A (zh) * 2016-12-07 2019-07-26 H.E.F.公司 摩擦片、包括这种摩擦片的机械系统和实施方法

Also Published As

Publication number Publication date
IE870314L (en) 1987-08-07
FR2594143B1 (fr) 1988-05-27
FR2594143A1 (fr) 1987-08-14
EP0237376B1 (de) 1989-12-13
ES2011803B3 (es) 1990-02-16
DE3761149D1 (de) 1990-01-18
IE59541B1 (en) 1994-03-09

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