US20090298726A1 - Heat-resistant bearing material - Google Patents

Heat-resistant bearing material Download PDF

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Publication number
US20090298726A1
US20090298726A1 US12/305,526 US30552607A US2009298726A1 US 20090298726 A1 US20090298726 A1 US 20090298726A1 US 30552607 A US30552607 A US 30552607A US 2009298726 A1 US2009298726 A1 US 2009298726A1
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US
United States
Prior art keywords
bearing material
alloy
alloy elements
heat
elements
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.)
Abandoned
Application number
US12/305,526
Inventor
Roland Ruch
Lutz Steinert
Klaus Wintrich
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Assigned to MAHLE INTERNATIONAL GMBH reassignment MAHLE INTERNATIONAL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WINTRICH, KLAUS, STEINERT, LUTZ, RUCH, RONALD
Publication of US20090298726A1 publication Critical patent/US20090298726A1/en
Abandoned 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
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • 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
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/60—Ferrous alloys, e.g. steel alloys
    • F16C2204/64—Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/40—Application independent of particular apparatuses related to environment, i.e. operating conditions
    • F16C2300/54—Application independent of particular apparatuses related to environment, i.e. operating conditions high-temperature
    • 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
    • F16C2360/00—Engines or pumps

Definitions

  • the invention relates to a heat-resistant bearing material consisting of an austenitic iron matrix alloy, and here addresses the problem of making such a bearing material functionally reliable for use at high temperatures, especially at temperatures exceeding 600° C., in particular exceeding 850° C.
  • the bearing material here is to exhibit solid lubricant properties, which are to be retained at the specified high temperatures to as high a degree as possible.
  • the invention is based on the general idea of providing sulfur in a percentage amount that allows sulfides required for a lubricating effect to form within the alloy.
  • Such a formation of sulfide within an austenitic matrix alloy intended to exhibit a high creep resistance and high strength at high temperatures is a contradiction in and of itself. This contradiction stems from the fact that, based on general expert knowledge, sulfides contained in such a material are disadvantageous for a high creep resistance and high strength at high temperatures because they constitute a structural disturbance, and must therefore be avoided.
  • the invention proposes something that runs absolutely counter to general expert knowledge with respect to the objective of obtaining a material that is highly creep resistant and strong in terms of temperature, and still exhibits lubricating properties even at high temperatures, and hence represents a surprising result not to be expected by an expert.
  • the drawing shows a few diagrams depicting characteristics for bearing materials according to the invention.
  • the curves denoted in individual diagrams relate to a material according to claim 7 if marked A, and a material according to claim 8 if marked B.
  • This diagram records the modulus of elasticity E and sheer modulus G for alloys A and B as a function of temperature.
  • This diagram depicts the thermal expansion coefficient for alloys A and B as a function of temperature.
  • This diagram records the hot hardness (in HV10) on the ordinate as a function of the temperature for alloys A and B.
  • the ordinate shows the hardness (in HB 2.5/187.5) for alloys A and B after stored for a respective 2 hours and air-cooled as a function of temperature.

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)
  • Sliding-Contact Bearings (AREA)

Abstract

A heat-resistant bearing material consisting of an austenitic iron matrix alloy should, under high temperatures, have good solid lubricant properties with a high heat resistance and a high creep resistance. To this end, an iron matrix alloy is used, containing a sufficient sulphur part for obtaining a solid lubricant action on the bearing surfaces thereof, and between 1 and 6 wt. % of at least one of the following alloy elements: tungsten (W), cobalt (Co), niobium (Nb), rhenium (Re), molybdenum (Mo), tantalium (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr), and/or comparably high-melting alloy elements.

Description

  • The invention relates to a heat-resistant bearing material consisting of an austenitic iron matrix alloy, and here addresses the problem of making such a bearing material functionally reliable for use at high temperatures, especially at temperatures exceeding 600° C., in particular exceeding 850° C. The bearing material here is to exhibit solid lubricant properties, which are to be retained at the specified high temperatures to as high a degree as possible.
  • This object is achieved by means of a bearing material according to the characterizing features of claim 1
  • Advantageous alloys of such a bearing material are the subject matter of the subclaims.
  • The invention is based on the general idea of providing sulfur in a percentage amount that allows sulfides required for a lubricating effect to form within the alloy. Such a formation of sulfide within an austenitic matrix alloy intended to exhibit a high creep resistance and high strength at high temperatures is a contradiction in and of itself. This contradiction stems from the fact that, based on general expert knowledge, sulfides contained in such a material are disadvantageous for a high creep resistance and high strength at high temperatures because they constitute a structural disturbance, and must therefore be avoided. Therefore, the invention proposes something that runs absolutely counter to general expert knowledge with respect to the objective of obtaining a material that is highly creep resistant and strong in terms of temperature, and still exhibits lubricating properties even at high temperatures, and hence represents a surprising result not to be expected by an expert.
  • The drawing shows a few diagrams depicting characteristics for bearing materials according to the invention. The curves denoted in individual diagrams relate to a material according to claim 7 if marked A, and a material according to claim 8 if marked B.
    • EXPLANATION TO INDIVIDUAL DIAGRAMS
  • FIG. 1 a, 1 b
  • These diagrams show the creep behavior of alloys A and B during the gradual exposure of a sample in increments of 2 MPa, a retention period of 35 sec and when measuring the creep rate in the last 5 sec of the retention period, specifically in part a for a creep behavior at 700° C., and in part b for a creep behavior at 900° C.
  • FIG. 2
  • This diagram records the modulus of elasticity E and sheer modulus G for alloys A and B as a function of temperature.
  • FIG. 3
  • This diagram depicts the thermal expansion coefficient for alloys A and B as a function of temperature.
  • FIG. 4
  • This diagram records the hot hardness (in HV10) on the ordinate as a function of the temperature for alloys A and B.
  • FIG. 5
  • The ordinate shows the hardness (in HB 2.5/187.5) for alloys A and B after stored for a respective 2 hours and air-cooled as a function of temperature.
  • FIG. 6
  • This figure contains a table that indicates values for p =density, λ=heat conductivity, Rp02=expansion limit, Rm=tensile strength, E=modulus of elasticity for alloys A and B at respective room temperature.
    •
  • All features described in the specification and the following claims can be significant to the invention both individually and taken together in whatever form.

Claims (4)

1. A heat-resistant bearing material that is an austenitic iron matrix alloy, consisting of:
a sufficient sulfur percentage to achieve a solid lubricant action on bearing surfaces of the bearing material, and
between 1% w/w and 6% w/w of at least one or more of the melting alloy elements:
tungsten (W), cobalt (Co), niobium (Nb), rhenium (Re), molybdenum (Mo), tantalum (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr) and an alloy with a comparable melting point to the melting alloy elements; and
wherein the following alloy composition is included, where the individual alloy elements are each indicated in % w/w:
C=0.4-0.6
Cr=18-27
Nb=1.4-1.8
Ni=12-22
S=0.2-0.5
Si=2.9-3.2
Residue=Iron
Contaminants or unspecified alloy elements up to 3.
2. The bearing material according to claim 1, wherein the following alloy composition is included, where the individual alloy elements are each indicated in % w/w:
C=0.4-0.6
Cr =18.5-20.5
Nb =1.4-1.8
Ni =12.5-14
S =0.25-0.45
Si=2.9-3.15
Residue=Iron
Contaminants or unspecified alloy elements up to 3.
3. The bearing material according to claim 1, wherein the following alloy composition is included, where the individual alloy elements are each indicated in % w/w:
C=0.4-0.6
Cr=24.5-26.5
Nb=1.4-1.8
Ni=19.5-21.5
S=0.25-0.45
Si=2.9-3.15
Residue=Iron
Contaminants or unspecified alloy elements up to 3.
4. The bearing material of claim 1, wherein a paddle bearing ring is constructed of the bearing material.
US12/305,526 2006-06-22 2007-05-31 Heat-resistant bearing material Abandoned US20090298726A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006029121.2 2006-06-22
DE102006029121A DE102006029121A1 (en) 2006-06-22 2006-06-22 Heat-resistant bearing material used for bearing ring comprises austenitic iron matrix alloy with sulfur content sufficient for producing solid lubricating action on its bearing surface
PCT/EP2007/055312 WO2007147710A1 (en) 2006-06-22 2007-05-31 Heat-resistant bearing material

Publications (1)

Publication Number Publication Date
US20090298726A1 true US20090298726A1 (en) 2009-12-03

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US12/305,526 Abandoned US20090298726A1 (en) 2006-06-22 2007-05-31 Heat-resistant bearing material

Country Status (6)

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US (1) US20090298726A1 (en)
EP (1) EP2029786B1 (en)
JP (1) JP5165679B2 (en)
BR (1) BRPI0713614B1 (en)
DE (2) DE102006029121A1 (en)
WO (1) WO2007147710A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104080939A (en) * 2012-03-07 2014-10-01 马勒国际有限公司 Heat-resistant bearing material made of an austenitic iron matrix alloy
CN108331838A (en) * 2016-08-26 2018-07-27 杨帆 A kind of self-lubricating internal combustion engine bearing
US11111819B2 (en) 2016-08-24 2021-09-07 Cpt Group Gmbh Iron material for high-temperature-resistant bearing bushings, bearing bushing made of said material, and turbocharger having such a bearing bushing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020202736A1 (en) 2020-03-04 2021-09-09 Mahle International Gmbh Metallic material

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737965A (en) * 1970-06-18 1973-06-12 Timken Co Roller bearing rings
US3825416A (en) * 1971-07-09 1974-07-23 Toyoda Chuo Kenkyusho Kk Self-lubricating iron base alloy
US4145604A (en) * 1976-09-08 1979-03-20 Ab Platslageriet Rostfri Automatically controlled electric steam cooking pan
US4927604A (en) * 1988-12-05 1990-05-22 Costar Corporation Multiwell filter plate vacuum manifold assembly
US20040134824A1 (en) * 2001-03-12 2004-07-15 Sandra Chan Canisters for use in metered dose inhalers

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JPS5129973B2 (en) * 1973-09-10 1976-08-28
SE392482B (en) * 1975-05-16 1977-03-28 Sandvik Ab ON POWDER METALLURGIC ROAD MANUFACTURED ALLOY CONSISTING OF 30-70 VOLUME PERCENT
JP2669419B2 (en) * 1986-09-02 1997-10-27 大同特殊鋼株式会社 Heat-resistant bearing steel
EP0668367B1 (en) * 1994-02-16 2002-06-19 Hitachi Metals, Ltd. Heat-resistant, austenitic cast steel and exhaust equipment member made thereof
JP2991923B2 (en) * 1994-03-19 1999-12-20 山陽特殊製鋼株式会社 Austenitic stainless steel with excellent machinability
DE4438073A1 (en) * 1994-10-25 1996-05-02 Man B & W Diesel Ag Cylinder liner for combustion machines, esp. large diesel engines
JP3452225B2 (en) * 1995-04-27 2003-09-29 日立金属株式会社 Bearing steel, bearing member excellent in heat resistance and toughness, and manufacturing method thereof
JP3909902B2 (en) * 1996-12-17 2007-04-25 株式会社小松製作所 Steel parts for high surface pressure resistance and method for producing the same
CN100537814C (en) * 2004-04-19 2009-09-09 日立金属株式会社 High Cr high-ni austenitic heat-resistant cast steel reaches by its exhaust system part that constitutes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737965A (en) * 1970-06-18 1973-06-12 Timken Co Roller bearing rings
US3825416A (en) * 1971-07-09 1974-07-23 Toyoda Chuo Kenkyusho Kk Self-lubricating iron base alloy
US4145604A (en) * 1976-09-08 1979-03-20 Ab Platslageriet Rostfri Automatically controlled electric steam cooking pan
US4927604A (en) * 1988-12-05 1990-05-22 Costar Corporation Multiwell filter plate vacuum manifold assembly
US20040134824A1 (en) * 2001-03-12 2004-07-15 Sandra Chan Canisters for use in metered dose inhalers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104080939A (en) * 2012-03-07 2014-10-01 马勒国际有限公司 Heat-resistant bearing material made of an austenitic iron matrix alloy
US11111819B2 (en) 2016-08-24 2021-09-07 Cpt Group Gmbh Iron material for high-temperature-resistant bearing bushings, bearing bushing made of said material, and turbocharger having such a bearing bushing
CN108331838A (en) * 2016-08-26 2018-07-27 杨帆 A kind of self-lubricating internal combustion engine bearing

Also Published As

Publication number Publication date
DE102006029121A1 (en) 2007-08-23
EP2029786B1 (en) 2011-01-19
WO2007147710A1 (en) 2007-12-27
EP2029786A1 (en) 2009-03-04
JP5165679B2 (en) 2013-03-21
JP2009541672A (en) 2009-11-26
DE502007006312D1 (en) 2011-03-03
BRPI0713614B1 (en) 2014-10-29
BRPI0713614A2 (en) 2012-10-16

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