WO2006034726A1 - Pièces de palier fabriquées selon la métallurgie des poudres pour turbocompresseurs à gaz d'échappement - Google Patents

Pièces de palier fabriquées selon la métallurgie des poudres pour turbocompresseurs à gaz d'échappement Download PDF

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Publication number
WO2006034726A1
WO2006034726A1 PCT/EP2004/010869 EP2004010869W WO2006034726A1 WO 2006034726 A1 WO2006034726 A1 WO 2006034726A1 EP 2004010869 W EP2004010869 W EP 2004010869W WO 2006034726 A1 WO2006034726 A1 WO 2006034726A1
Authority
WO
WIPO (PCT)
Prior art keywords
powder
weight
bearing parts
particle size
microns
Prior art date
Application number
PCT/EP2004/010869
Other languages
German (de)
English (en)
Inventor
Gerd Krüger
Franz-Josef Schleifstein
Original Assignee
Bleistahl-Produktions Gmbh & Co. Kg
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 Bleistahl-Produktions Gmbh & Co. Kg filed Critical Bleistahl-Produktions Gmbh & Co. Kg
Priority to PCT/EP2004/010869 priority Critical patent/WO2006034726A1/fr
Publication of WO2006034726A1 publication Critical patent/WO2006034726A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the invention relates to bearing parts produced by powder metallurgy, in particular for turbochargers and in particular turbocharger sleeves, and to a method for producing such parts.
  • Powder metallurgical manufacturing processes enable high-precision manufacturing, which requires only a few reworking steps.
  • components which are otherwise difficult to mix in, for example lubricants and lubricants can be admixed or alloyed in a simple manner by powder metallurgy.
  • the object of the invention is therefore to provide bearing parts, in particular turbocharger sleeves, which are sufficiently resistant to oxidation and temperature and at temperatures up to 1100 0 C have good sliding properties.
  • the parts should have a sufficiently high stability.
  • This object is with powder metallurgically produced bearing parts with
  • Cobalt-molybdenum alloys for the powder metallurgical production of valve seat rings are known from DE 34 13 593 C1. It has now surprisingly been found that these alloys are also suitable for use in turbochargers in question, where it depends on good sliding properties at high temperatures up to 1100 0 C and more. Valve seat rings are subjected to a maximum of 750 0 C.
  • the alloys according to the invention are distinguished by their cobalt content, which is in the range from 4 to 26% by weight. Powder metallurgically produced bearing parts having a cobalt content increased in this way exhibit the desired good sliding properties and a long service life.
  • the cobalt content in the parts produced according to the invention is preferably in the range from 10 to 25% by weight of Co, particularly preferably in the range from 16 to 24% by weight of Co.
  • To prepare the parts according to the invention it is possible to use customary metal powders having an average particle size in the range from 0.5 to 40 ⁇ m. However, it has proved to be advantageous if the cobalt powder has an average particle size of ⁇ 10 ⁇ m and in particular in the range of 0.5 to 5 ⁇ m.
  • the average particle size is mostly in the range of 10 to 40 microns.
  • the individual components can be added as element powder. In most cases, however, the carbon is added bound to other metals, for example with the iron.
  • the sulfur content can be added in particular as manganese sulfide or molybdenum sulfide. The sulfur content is partly responsible for the sliding properties and, as internal lubrication, ensures improved emergency running properties.
  • the admixture of the chromium in the form of ferrochrome powder is advantageous.
  • the bearing parts according to the invention are produced in the usual way.
  • the powder mixture which optionally in small quantities a ausgasendes at high temperatures wax or the like for shape stabilization of Rohpreßlinge is pressed with a pressing force of more than 40 MPa to the sliding parts, in particular sleeves, which then at a temperature of up to 1200 0 C are sintered in a neutral or reducing atmosphere.
  • the sintered pieces are optionally subjected to a post-compaction with a pressing force of more than 120 MPa and optionally further tempered.
  • the re-compaction is a conventional hot or cold compaction.
  • Post-tempering may be carried out by heating the tubes after compaction for 15 minutes to a temperature above the AC 3 point, then cooling them and tempering them at a temperature of about 600 ° C. for 30 minutes.
  • the metal powders used are those which are usually related to powder metallurgy. Particular preference is given to powders having a blistered form, which lead to an intimate toothing of the particles and thus to a better cohesion of the compacts.
  • bearing parts parts that are involved in a sliding process, including, for example, guides for predominantly linearly moving components, such as valve guides.
  • a blank with 0.85 wt .-% C, 18.5 wt .-% Co, 1, 65 wt .-% Mo, 2.9 wt .-% Cr, 1, 9 wt .-% Ni, 0, 35% by weight of Mn, 0.35% by weight of S, remainder of Fe and unavoidable traces were prepared by using a wax - 0.5% by weight based on the alloying ingredients - in a conventional manner.
  • the powders used had an average particle size in the range of 10 to 40 microns, the cobalt powder has an average particle size of ⁇ 5 microns.
  • the manganese was added as manganese sulfide, the chromium as ferrochrome.
  • the blank was pressed twice with more than 60 MPa and then sintered at a temperature of more than 1050 0 C under reducing conditions.

Abstract

Pièces de palier, en particulier pour des turbocompresseurs à gaz d'échappement, fabriquées selon un processus de métallurgie des poudres, qui contiennent 0,8 à 1,2 % en poids de C, 4 à 26 % en poids de Co, 1,5 à 2,5 % en poids de Mo, 2,0 à 3,0 % en poids de Cr, 1,0 à 2,0 % en poids de Ni, 0,3 à 0,7 % en poids de Mn, 0,3 à 0,7 % en poids de S, le reste étant du fer Fe, et procédé de fabrication de pièces de ce type.
PCT/EP2004/010869 2004-09-29 2004-09-29 Pièces de palier fabriquées selon la métallurgie des poudres pour turbocompresseurs à gaz d'échappement WO2006034726A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/010869 WO2006034726A1 (fr) 2004-09-29 2004-09-29 Pièces de palier fabriquées selon la métallurgie des poudres pour turbocompresseurs à gaz d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2004/010869 WO2006034726A1 (fr) 2004-09-29 2004-09-29 Pièces de palier fabriquées selon la métallurgie des poudres pour turbocompresseurs à gaz d'échappement

Publications (1)

Publication Number Publication Date
WO2006034726A1 true WO2006034726A1 (fr) 2006-04-06

Family

ID=34959020

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/010869 WO2006034726A1 (fr) 2004-09-29 2004-09-29 Pièces de palier fabriquées selon la métallurgie des poudres pour turbocompresseurs à gaz d'échappement

Country Status (1)

Country Link
WO (1) WO2006034726A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3413593C1 (de) * 1984-04-11 1985-11-07 Bleistahl GmbH, 5802 Wetter Verfahren zur Herstellung von Ventilsitzringen
JPH07316726A (ja) * 1994-05-25 1995-12-05 Kawasaki Steel Corp 熱処理生産性ならびに繰り返し応力負荷によるミクロ組織変化の遅延特性に優れた軸受部材
US6082317A (en) * 1997-06-27 2000-07-04 Nippon Piston Ring Co., Ltd. Valve seat for internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3413593C1 (de) * 1984-04-11 1985-11-07 Bleistahl GmbH, 5802 Wetter Verfahren zur Herstellung von Ventilsitzringen
JPH07316726A (ja) * 1994-05-25 1995-12-05 Kawasaki Steel Corp 熱処理生産性ならびに繰り返し応力負荷によるミクロ組織変化の遅延特性に優れた軸受部材
US6082317A (en) * 1997-06-27 2000-07-04 Nippon Piston Ring Co., Ltd. Valve seat for internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 04 30 April 1996 (1996-04-30) *

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