EP0590107A1 - Materiau de friction fritte pour elements a liaison par friction, et procede pour leur fabrication - Google Patents

Materiau de friction fritte pour elements a liaison par friction, et procede pour leur fabrication

Info

Publication number
EP0590107A1
EP0590107A1 EP93903892A EP93903892A EP0590107A1 EP 0590107 A1 EP0590107 A1 EP 0590107A1 EP 93903892 A EP93903892 A EP 93903892A EP 93903892 A EP93903892 A EP 93903892A EP 0590107 A1 EP0590107 A1 EP 0590107A1
Authority
EP
European Patent Office
Prior art keywords
sintered
material according
friction
friction material
graphite
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Withdrawn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
EP93903892A
Other languages
German (de)
English (en)
Inventor
Detlef Gonia
Lothar Schneider
Heinz Rebsch
Marion Eckhardt
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.)
Sintermetallwerk Krebsoege GmbH
Original Assignee
Sintermetallwerk Krebsoege GmbH
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 Sintermetallwerk Krebsoege GmbH filed Critical Sintermetallwerk Krebsoege GmbH
Publication of EP0590107A1 publication Critical patent/EP0590107A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
    • F16D69/02—Composition of linings ; Methods of manufacturing
    • F16D69/027—Compositions based on metals or inorganic oxides

Definitions

  • the invention relates to a sintered friction material in powder form with an iron matrix and a proportion of graphite for the production of frictional elements, in particular of synchronization bodies.
  • Such sintered friction materials are used for frictional elements, which are part of clutches, brakes or synchronization devices, for example.
  • a main area of application is synchro rings, from which high load limits are required.
  • a friction element for oil running is known from DD-PS 89 727, which is intended for single-disc and multi-plate clutches, brakes or synchronous rings.
  • This known friction element is manufactured using powder metallurgy. It receives iron powder metallic additives of nickel, copper and lead as well as graphite, each in powder form. The use of lead results in a considerable health hazard both in the manufacture and in the use of the friction element.
  • the friction element made from this material tends to show strong adhesion, which manifests itself in a non-uniform torque build-up and seizures.
  • DE-GM 73 42 680 describes a synchronizer ring made of sintered steel, on which a thin molybdenum layer is applied in the area of the friction surface.
  • Molybdenum spray material is an expensive material. As a rule, it must be brought to the required surface dimensions on the synchronizing ring by grinding.
  • the applied layer has a relatively large surface roughness, so that the effective friction surface is comparatively small. In particular, this can lead to strong heating in the friction surface, which can result in the synchronizer ring and synchronizer body seizing and the molybdenum layer becoming detached.
  • the object of the invention is to create a sintered friction material which can withstand high loads with a sufficient coefficient of friction, in particular with regard to surface pressure and friction speed.
  • This sintered material is said to be able to be used inexpensively in the manufacture of frictionally locking elements, in particular of synchronizing bodies, such as synchronizing rings.
  • the recyclability of the sintered friction material and the frictional elements produced using it should be improved.
  • the powdery material contains a proportion of graphite from 15 to 30 percent by volume and an alloy content of 0.3 to 6 percent by mass of phosphorus, boron and / or sulfur.
  • the friction and wear behavior of the material is optimized by the proportion of graphite of at least 15 percent by volume.
  • the alloy proportions especially if they are not only dissolved in iron, but also as phosphides, borides or sulfides of iron, greatly reduce the tendency of the iron matrix to weld or eat. By not using lead, the health hazard in the manufacture of the known material is eliminated.
  • a relatively coarse-grained graphite powder or a graphite powder mixture with a large particle size distribution range is preferably used.
  • the graphite is natural graphite, with which the desired grain size spectrum is achieved. This takes place above all if, in a further embodiment of the invention, the average grain size of natural graphite is 20 to 120 ⁇ m.
  • the sintered friction material according to the invention can be designed in such a way that it contains a proportion of 5 to 15 volume percent of non-metallic substances which are constituted from metal oxides, metal carbides and / or alkaline earth metal sulfates. It has proven to be advantageous if these substances are used not as a chemical, but preferably as a natural substance in the form of mineral flour.
  • the invention also relates to a method for producing a friction lining from a sintered friction material described above.
  • the powdery starting components are mixed intimately, pressed at a pressure of 300 to 800 MPa and sintered at a temperature of 950 to 1150 ° C. in a protective gas atmosphere.
  • the atmosphere can be inert or reduced.
  • the invention relates to a frictional element, in particular a synchronizer ring, with a friction lining made of the sintered friction material described above.
  • the carrier for the friction lining consists of sintered steel.
  • the joining problem according to the invention can be solved either by pressing and sintering the friction lining and carrier material together or by sintering the friction lining material onto a steel beam.
  • the friction lining is a component of the gradient structure of a sintered steel synchronizer ring. It must be emphasized that this type of joining is particularly cost-effective.
  • the friction material has the level of friction required for use in synchronizers.
  • the axial wear is less than 0.5 mm under normal load after 100,000 switching operations.
  • Recyclability can be illustrated using the example of a synchronizer ring with a friction lining according to the invention, since the synchronizer ring has the same material base as the construction materials of the transmission.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Operated Clutches (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un matériau de friction fritté, se présentant sous forme de poudre et comprenant une matrice de fer et une proportion de graphite, pour la fabrication d'éléments à liaison par friction. Le matériau doit être en mesure de résister à des charges élevées, pour un coefficient de frottement suffisant et, en outre, doit pouvoir être utilisé économiquement lors de la fabrication d'éléments à liaison par friction. De plus, l'invention vise à améliorer la possibilité de recyclage dedits éléments fabriqués en utilisant ledit matériau. Ces buts sont atteints grâce au fait que le matériau selon l'invention comprend une proportion de graphite de 15 à 30 % en volume et une proportion en éléments d'alliage: phosphore, bore et/ou soufre, de 0,3 à 6 % en masse. Le principal domaine d'application réside dans la fabrication de bagues de synchronisation dont on exige des charges limites élevées.
EP93903892A 1992-02-06 1993-01-30 Materiau de friction fritte pour elements a liaison par friction, et procede pour leur fabrication Withdrawn EP0590107A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4203321A DE4203321A1 (de) 1992-02-06 1992-02-06 Sinterreibwerkstoff fuer reibschluessige elemente, insbesondere von synchronisierungskoerpern, sowie verfahren zum herstellen von sinterreibbelag und reibschluessigem element
DE4203321 1992-02-06
PCT/EP1993/000216 WO1993016207A1 (fr) 1992-02-06 1993-01-30 Materiau de friction fritte pour elements a liaison par friction, et procede pour leur fabrication

Publications (1)

Publication Number Publication Date
EP0590107A1 true EP0590107A1 (fr) 1994-04-06

Family

ID=6451033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93903892A Withdrawn EP0590107A1 (fr) 1992-02-06 1993-01-30 Materiau de friction fritte pour elements a liaison par friction, et procede pour leur fabrication

Country Status (3)

Country Link
EP (1) EP0590107A1 (fr)
DE (1) DE4203321A1 (fr)
WO (1) WO1993016207A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4400431A1 (de) * 1994-01-10 1995-07-13 Krebsoege Gmbh Sintermetall Sinterreibwerkstoff für reibschlüssiges Element
CN105798311B (zh) * 2016-03-21 2018-07-10 北京科技大学 一种高导热铁基粉末冶金高速列车刹车片的制备方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH352352A (de) * 1955-12-31 1961-02-28 Cosid Werke Veb Verfahren zur Herstellung eines Eisen-Graphit-Verbundwerkstoffes
DE1126623B (de) * 1959-01-09 1962-03-29 Jurid Werke Gmbh Verfahren fuer die Aufbereitung graphithaltiger Pulvermischungen zur Herstellung von gesinterten Reibwerkstoffen
CA1162005A (fr) * 1980-12-19 1984-02-14 Herbert W. Lloyd Garniture de friction en poudre de metal frittee

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9316207A1 *

Also Published As

Publication number Publication date
DE4203321A1 (de) 1993-08-12
WO1993016207A1 (fr) 1993-08-19

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: ECKHARDT, MARION

Inventor name: REBSCH, HEINZ

Inventor name: SCHNEIDER, LOTHAR

Inventor name: GONIA, DETLEF

17Q First examination report despatched

Effective date: 19970704

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Effective date: 19980115