WO1998025720A1 - Agglomerated iron-based powders - Google Patents

Agglomerated iron-based powders Download PDF

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Publication number
WO1998025720A1
WO1998025720A1 PCT/SE1997/002062 SE9702062W WO9825720A1 WO 1998025720 A1 WO1998025720 A1 WO 1998025720A1 SE 9702062 W SE9702062 W SE 9702062W WO 9825720 A1 WO9825720 A1 WO 9825720A1
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WO
WIPO (PCT)
Prior art keywords
weight
particle size
less
essentially
powder
Prior art date
Application number
PCT/SE1997/002062
Other languages
French (fr)
Inventor
Johan Arvidsson
Original Assignee
Höganäs Ab
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 Höganäs Ab filed Critical Höganäs Ab
Priority to JP52655698A priority Critical patent/JP4169369B2/en
Priority to DE19782155T priority patent/DE19782155T1/en
Priority to DE19782155A priority patent/DE19782155B4/en
Priority to AU78457/98A priority patent/AU7845798A/en
Publication of WO1998025720A1 publication Critical patent/WO1998025720A1/en
Priority to US09/325,348 priority patent/US6120575A/en

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Classifications

    • 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

Definitions

  • the present invention concerns agglomerated iron- based powders and a method for the preparation thereof. More specifically, the invention concerns agglomerated iron-based powders for the preparation of wear resistant materials, which combine low friction, good wear resistance and self lubrication and which advantageously can be used in e.g. heavy-duty diesel engines. When using the agglomerated powders these materials can be prepared by conventional technique from inexpensive raw materials ' in existing plants.
  • the starting materials for such wear resistant material could be selected from the following materials. a) 63-95 % by weight of a fine base powder consisting essentially of iron and having a particle size essentially less than 75 ⁇ m b) 5-20 % by weight of a lubricating phase having a particle size essentially less than 120 ⁇ m and preferably less than 60 ⁇ m c) 0-15 % by weight of a hard phase material having a particle size essentially less than 10 ⁇ m, and d) 0-7 % of additives including binding agent (s), solvent (s) and optionally lubricant (s)
  • the base powder could be selected from the group consisting of prealloyed powders, partially prealloyed powders or pure iron powders.
  • prealloyed powders are e.g. Astaloy Mo
  • the partially prealloyed powders can be e.g. Distaloy SE and Distaloy AE .
  • Pure iron powders which advantageously could be used are e.g. ASC 100.29, NC 100.24, SC 100.26 and AHC 100.29. All powders are available from Hoganas AB, Sweden.
  • the lubricating phase according to the invention is present also after the sintering process and is a solid inorganic material.
  • examples of such materials are metal sulphides, metal chlorides and metal fluorides.
  • a preferred material is MnS.
  • the lubricating phase could also be MnX available from Hoganas AB, Sweden. If more than 20 % is added the strength will be adversely affected and if less than 5 % is added the friction will be too high. According to a preferred embodiment the amount of the lubricating phase is 5 - 15 % by weight.
  • the hard phase powder is selected from carbides, such as NbC, TiC, VC, TaC. If the amount of the hard phase powder is more than 15 % the compressibility will be too low. According to a preferred embodiment the amount of hard phase powder is not more than 10 %. In practice the amount of the hard phase powder is chosen in view of the desired wear resistance.
  • the different additives could be selected from the group consisting of Fe P, graphite and/or various conventional lubricants, such as waxes, stearates and polymers. Unexpected problems were encountered when these powder mixtures should be used on an industrial scale, as it turned out that the powders had essentially no flow and good flow is a necessary prerequisite for industrial production. Other disadvantages involved too much segregation and dusting during handling.
  • the binding agent could be any conventioanl binding agent used within the P/M field. More specifically, the binding agent could be selected from the group consisting of polyesters and polyalcohols . Cellulose acetate butyrate is a presently preferred binding agent.
  • the solvent depends on the binding agent and is selected from the group consisting of water, alcohols and ketones.
  • a preferred solvent is acetone.
  • the agglomerated powder which has a particle size essentially between about 75 and 150 ⁇ m, can be uniaxially compacted to a green body having a density exceeding 85 and preferably exceeding 90 percent of the theoretical density.
  • the agglomerated powder is compacted at a pressure between about 400 and 800 MPa and subsequently sintered at e.g. 1250°C for 45 minutes in 95/5 N 2 /H 2 . Sizing is performed at eg 800 MPa, carburizing at 860°C for eg 30 minutes in about 0.9 %C and tempering is carried out at a temperature of about 180°C for about 60 minutes.
  • the properties of a compacted and sintered product obtained from an agglomerated powder according to the invention were superior to the properties of a correspon- ding material which was obtained with a non-agglomerated powder.
  • a powder mix of 20 kg is prepared and put in a Y-cone mixer.
  • the acetone and the binder (cellulose acetate butyrate) are added to the mix according to the schedule stated below.
  • the group 3 materials needed extra binder and solvent for the granulation to be sufficient.
  • the first parameter is the amount of MnS added, the low level is 5% MnS and the high is 15% MnS.
  • the second parameter is the type of MnS.
  • the first type of MnS is the normal MnS which is added to PM mixes as machining aid and the second type of MnS is a course MnS with a particle size essentially between 60 ⁇ m and 120 ⁇ m using a Tyler mesh standard sieve.
  • the mid-point is 10% MnS, that is a mix of 50% normal MnS that has an average particle size essentially less than 60 ⁇ m and 50% of material that has a particle size essentially between 60 ⁇ m and 120 ⁇ m. As no hard phase is added, the amount of binder can be kept low and the compressibility is not much reduced.
  • a sintered component based on Cold PMo contains a lot of carbides after sintering. Addition of hard phase requires an increased sintering temperature and is not good for the mechanical properties of the material.
  • MnS mix 50% MnS having a particle size essentially less than 60 ⁇ m and 50% MnS having a particle size essentially between 60 and 120 ⁇ m
  • Granulation aid 0.15% binder
  • the third group of materials is high-speed steel mixes.
  • the carbides are useful in order to improve the wear resistance.
  • the hard phase together with the M3/2 that has poor compressibility gives the materials with the lowest compressibility.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

This invention concerns a process for the preparation of a free flowing agglomerated iron-based powder comprising mixing dry ingredients of: a) 63-95 % by weight of a fine base powder consisting essentially of iron and having a particle size essentially less than 75 νm; b) 5-20 % by weight of a lubricating phase having a particle size essentially less than 120 νm, preferably less than 60 νm; c) 0-15 % by weight of a hard phase material having a particle size essentially less than 10 νm; and d) 0-7 % of additives in a mixing chamber; evacuating the mixing chamber; filling the mixing chamber with an inert gas, mixing the ingredients with at most 1 % by weight of a binding agent, and adding a solvent and drying the obtained powder.

Description

AGGLOMERATED IRON-BASED POWDERS
The present invention concerns agglomerated iron- based powders and a method for the preparation thereof. More specifically, the invention concerns agglomerated iron-based powders for the preparation of wear resistant materials, which combine low friction, good wear resistance and self lubrication and which advantageously can be used in e.g. heavy-duty diesel engines. When using the agglomerated powders these materials can be prepared by conventional technique from inexpensive raw materials' in existing plants.
From theoretical and practical considerations it has been found that the starting materials for such wear resistant material could be selected from the following materials. a) 63-95 % by weight of a fine base powder consisting essentially of iron and having a particle size essentially less than 75 μm b) 5-20 % by weight of a lubricating phase having a particle size essentially less than 120 μm and preferably less than 60 μm c) 0-15 % by weight of a hard phase material having a particle size essentially less than 10 μm, and d) 0-7 % of additives including binding agent (s), solvent (s) and optionally lubricant (s)
The base powder could be selected from the group consisting of prealloyed powders, partially prealloyed powders or pure iron powders. Examples of prealloyed powders are e.g. Astaloy Mo and the partially prealloyed powders can be e.g. Distaloy SE and Distaloy AE . Pure iron powders which advantageously could be used are e.g. ASC 100.29, NC 100.24, SC 100.26 and AHC 100.29. All powders are available from Hoganas AB, Sweden.
The lubricating phase according to the invention is present also after the sintering process and is a solid inorganic material. Examples of such materials are metal sulphides, metal chlorides and metal fluorides. A preferred material is MnS. The lubricating phase could also be MnX available from Hoganas AB, Sweden. If more than 20 % is added the strength will be adversely affected and if less than 5 % is added the friction will be too high. According to a preferred embodiment the amount of the lubricating phase is 5 - 15 % by weight.
The hard phase powder is selected from carbides, such as NbC, TiC, VC, TaC. If the amount of the hard phase powder is more than 15 % the compressibility will be too low. According to a preferred embodiment the amount of hard phase powder is not more than 10 %. In practice the amount of the hard phase powder is chosen in view of the desired wear resistance. The different additives could be selected from the group consisting of Fe P, graphite and/or various conventional lubricants, such as waxes, stearates and polymers. Unexpected problems were encountered when these powder mixtures should be used on an industrial scale, as it turned out that the powders had essentially no flow and good flow is a necessary prerequisite for industrial production. Other disadvantages involved too much segregation and dusting during handling.
According to the invention these problems have been obviated by using a process including the following steps :
1) Mixing the dry ingredients according to points a)-d) above in a mixing chamber.
2) Evacuating the mixing chamber to less than 25, preferably less than 15 mbar. 3) Filling the mixing chamber with an inert gas to slight underpressure to about 950, preferably about 900 mbar .
4) Mixing the ingredients with less than 1 % by weight, based on the whole mixture, of a binding agent and adding a solvent.
5) Drying the obtained powder.
An important feature of the granulation process is the low amount of binding agent, which is beneficial to the subsequent sintering process and, consequently, to the final product. The binding agent could be any conventioanl binding agent used within the P/M field. More specifically, the binding agent could be selected from the group consisting of polyesters and polyalcohols . Cellulose acetate butyrate is a presently preferred binding agent.
The solvent depends on the binding agent and is selected from the group consisting of water, alcohols and ketones. A preferred solvent is acetone. The agglomerated powder, which has a particle size essentially between about 75 and 150 μm, can be uniaxially compacted to a green body having a density exceeding 85 and preferably exceeding 90 percent of the theoretical density. In order to prepare the final wear resistant material, the agglomerated powder is compacted at a pressure between about 400 and 800 MPa and subsequently sintered at e.g. 1250°C for 45 minutes in 95/5 N2/H2. Sizing is performed at eg 800 MPa, carburizing at 860°C for eg 30 minutes in about 0.9 %C and tempering is carried out at a temperature of about 180°C for about 60 minutes.
The properties of a compacted and sintered product obtained from an agglomerated powder according to the invention were superior to the properties of a correspon- ding material which was obtained with a non-agglomerated powder.
The invention is illustrated by the following non- limiting examples.
Group Material
1 Astaloy Mo* <75 μm + MnS(5%, 15%)+ MnS
(20 μm, <60 μm)
2 Cold PMo* + MnS (5%, 15%) 3 M3/2** + MnS (5%, 15%) + 7,74% NbC/5% TiC
* Available from Hoganas AB, Sweden
** Standard quality of high-speed steel available from Coldstream A.S., Belgium.
Granulation
A powder mix of 20 kg is prepared and put in a Y-cone mixer. The acetone and the binder (cellulose acetate butyrate) are added to the mix according to the schedule stated below.
0.15% binder (group 1 and 2 materials) 0.3% binder (group 3 materials) 4.0% acetone (group 1 and 2 materials) 6.0% acetone (group 3 materials)
Process schedule:
1. Mixing of dry powder
2. Evacuation of mixer 3. Fill mixer with N2
4. Start the intensifier, add the solvent with the in- tensifier running. Continuously adjust the pres sure so that slight under-pressure is kept
5. Let the intensifier run until the mixture is homogeneous. 6. Dry/evacuate the powder until the pressure is about 2-10 mbar
7. Run the mixer 2-10 more minutes
8. Fill the mixer with N2 to atmospheric pressure 9. Empty the mixer
The group 3 materials needed extra binder and solvent for the granulation to be sufficient.
Materials
Group 1
Two parameters and two levels are tested with one additional mid-point. The first parameter is the amount of MnS added, the low level is 5% MnS and the high is 15% MnS. The second parameter is the type of MnS. The first type of MnS is the normal MnS which is added to PM mixes as machining aid and the second type of MnS is a course MnS with a particle size essentially between 60 μm and 120 μm using a Tyler mesh standard sieve. The mid-point is 10% MnS, that is a mix of 50% normal MnS that has an average particle size essentially less than 60 μm and 50% of material that has a particle size essentially between 60 μm and 120 μm. As no hard phase is added, the amount of binder can be kept low and the compressibility is not much reduced.
Material Composition
ST-1 95% Base material + 5% MnS less than 60μm + 0.4% H- wax
ST-2 95% Base material + 5% MnS 60-120μm + 0.4% H-wax
ST-3 85% Base material + 15% MnS less than 60μm + 0.4% H- wax
ST-4 85% Base material + 15% MnS 60-120μm+ 0.4% H-wax
ST-5 90% Base material + 10% MnS mix
Base material 97.6% Astaloy Mo <75 + 0.4% graphite MnS mix 50% MnS having an average particle size essentially less than 60 μm and 50% MnS having a particle size essentially between 60 and 120 μm Granulation aid 0.15% binder
Material AD Flow GD P Mn Mo Cu g/cm3 sec/50g g/cm3
ST-1 3,39 25,77 6,66 0,21 3,0 1,4 1,6
ST-2 3,42 26,97 6,64 0,20 3,2 1,3 1,6
ST-3 3,02 31,98 6,13 0,17 8,8 1,1 1,4
ST-4 3,08 29,88 6,08 0,18 8,8 1,1 1,4
ST-5 3,10 29, 90 6,40 0,20 5,7 1,1 1,4
Group 2
A sintered component based on Cold PMo contains a lot of carbides after sintering. Addition of hard phase requires an increased sintering temperature and is not good for the mechanical properties of the material.
As in the previous group when no hard phase is added, the amount of binder can be kept low and the compressibility is not much reduced. Material Composition
A-l 100% Cold PMo
A-2 95% Cold PMo + 5% MnS mix + 0,4% H-wax
A-3 90% Cold PMo + 10% MnS mix + 0,4% H-wax
A-4 85% Cold PMo + 15% MnS mix + 0,4% H-wax
A-5 85% Cold PMo + 15% MnS mix
A-6 90% Astaloy Mo<75 μm + 10% MnS mix
Cold PMo = 95% prealloyed, water atomized with 10% molybdenum, to which are added 1.15% graphite and 3.85%
Fe3P
MnS mix = 50% MnS having a particle size essentially less than 60 μm and 50% MnS having a particle size essentially between 60 and 120 μm
Granulation aid 0.15% binder
Material AD flow GD P Mn Mo Cu g/cm3 sec/50g g/cm3 A-l 3,32 24,06 6,45 0,46 2,8 10 A-2 3,49 23,33 6,32 0,42 3,0 9,6 A-3 3,29 25, 17 6, 10 0,40 5,8 9,1 A-4 3,17 26, 18 5, 91 0,43 9,4 8,3 A-5 3,11 25,46 5,88 0,45 9,4 8,3 A-6 3 3,,2200 2 299,,9955 6 6,,4444 - - 5 5,,88 1 1,,22 1,6
Group 3
The third group of materials is high-speed steel mixes. The carbides are useful in order to improve the wear resistance. The hard phase together with the M3/2 that has poor compressibility gives the materials with the lowest compressibility. Material Composition
BF-1 86,76% M3/2 + 5% MnS* + 7,74% NbC + 0,5% H-wax
BF-2 76,76% M3/2 + 15% MnS* + 7,74% NbC + 0,5% H-wax BF-3 89,5% M3/2 + 5% MnS* + 5% TiC + 0,5% H-wax
BF-4 79,5% M3/2 + 15% MnS* + 5! TiC + 0,5% H-wax
*Powder having a particle size essentially less than 60μm Granulation aid 0.3% binder
Material AD flow GD P Mn" Mo Cu g/cm3 sec/5 g/cm3 Og BF-1 2, 62 36,23 6,07 BF-2 2,74 36,62 5,85 BF-3 2,62 36,23 5,88 BF-4 2,72 37,00 5,71
The above tables disclose that a flow between 25 and 40 sek/50 g can be obtained by using the agglomeration process according to the present invention. No flow could be obtained for the untreated non-agglomerated powders.

Claims

1. A process for the preparation of a free flowing agglomerated iron-based powder comprising mixing dry ingredients of a) 63-95 % by weight of a fine base powder consisting essentially of iron and having a particle size essentially less than 75 μm b) 5-20 % by weight of a lubricating phase having a particle size essentially less than 120 μm, preferably less than 60 μm; c) 0-15 % by weight of a hard phase material having a particle size essentially less than 10 μm, and d) 0-7 % of additives in a mixing chamber; evacuating the mixing chamber; filling the mixing chamber with an inert gas; mixing the ingredients with at most 1 % by weight, based on the total mixture, of a binding agent and adding a solvent and drying the obtained powder.
2. Process according to claim 1, wherein the lubricating phase essentially consists of MnS.
3. Process according to claim 1 or 2, wherein the hard phase is selected from the group consisting of car- bides, such as NbC, TiC, VC, TaC.
4. Process according to any one of claims 1 - 3, wherein the additive is selected from the group consisting of Fe3P, graphite and/or various conventional lubricants, such as waxes, stearates and polymers.
5. A free flowing agglomerate powder having a granular size between essentially 75 and 150 μm prepared in accordance with the process of any one of the claims 1 - 4 from an iron base powder having a particle size essentially below 75μm and including an amount of binding agent less than 1%, characterized in that the agglomerate is uniaxially compressible to a density of at least 85, preferably at least 90 % of the theoretical density when compacted at a pressure between 400 and 800 MPa.
6. The free flowing agglomerate according to claim 5 comprising a) 63-95 % by weight of a fine base powder consist- ing essentially of iron and having a particle size essentially less than 75 μm b) 5-20 % by weight of a lubricating phase having a particle size essentially less than 120 μm, preferably less than 60 μm; c) 0-15 % by weight of a hard phase material having a particle size essentially less than 10 μm, and d) 0-2 % of additives.
7. The free flowing agglomerate according to claim 6 comprising 5-15 % by weight of a lubricating phase.
PCT/SE1997/002062 1996-12-10 1997-12-10 Agglomerated iron-based powders WO1998025720A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP52655698A JP4169369B2 (en) 1996-12-10 1997-12-10 Agglomerated iron-based powder
DE19782155T DE19782155T1 (en) 1996-12-10 1997-12-10 Agglomerated iron base powder
DE19782155A DE19782155B4 (en) 1996-12-10 1997-12-10 Agglomerated iron-based powder
AU78457/98A AU7845798A (en) 1996-12-10 1997-12-10 Agglomerated iron-based powders
US09/325,348 US6120575A (en) 1996-12-10 1999-06-04 Agglomerated iron-based powders

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9604538A SE9604538D0 (en) 1996-12-10 1996-12-10 Agglomerated iron-based powders
SE9604538-0 1996-12-10

Related Child Applications (1)

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US09/325,348 Continuation US6120575A (en) 1996-12-10 1999-06-04 Agglomerated iron-based powders

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WO1998025720A1 true WO1998025720A1 (en) 1998-06-18

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JP (1) JP4169369B2 (en)
AU (1) AU7845798A (en)
DE (2) DE19782155B4 (en)
SE (1) SE9604538D0 (en)
WO (1) WO1998025720A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000000656A1 (en) * 1998-06-30 2000-01-06 Aplicaciones De Metales Sinterizados, Sa High wear-resistance composite material, and parts obtained therewith
US7192464B2 (en) 2003-09-03 2007-03-20 Apex Advanced Technologies, Llc Composition for powder metallurgy
WO2011051293A1 (en) 2009-10-26 2011-05-05 Höganäs Ab Iron based powder composition
EP2743361A1 (en) * 2012-12-14 2014-06-18 Höganäs AB (publ) New product and use thereof
EP2781283A1 (en) * 2013-03-19 2014-09-24 Hitachi Chemical Company, Ltd. Iron base sintered sliding member and method for producing same
RU2690127C1 (en) * 2018-12-18 2019-05-30 Публичное акционерное общество "Северсталь" Method of producing powder mixture, which is ready for pressing of metallurgical parts
RU2692002C1 (en) * 2018-12-19 2019-06-19 Публичное акционерное общество "Северсталь" Method of producing complex-alloyed powder mixture, ready for molding

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014112374A1 (en) * 2014-08-28 2016-03-03 Deutsche Edelstahlwerke Gmbh Steel with high wear resistance, hardness and corrosion resistance as well as low thermal conductivity and use of such a steel
JP6668031B2 (en) * 2014-09-30 2020-03-18 日本ピストンリング株式会社 Iron-based sintered alloy material for sliding members

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EP0118716A1 (en) * 1983-02-03 1984-09-19 Siemens Aktiengesellschaft Process for agglomerating metal powders or metal powder mixtures having a poor flowability
EP0310115A1 (en) * 1987-09-30 1989-04-05 Kawasaki Steel Corporation Iron base powder mixture and method
WO1994023868A1 (en) * 1993-04-13 1994-10-27 Hoeganaes Corporation Metal powder compositions containing binding agents for elevated temperature compaction
EP0719608A2 (en) * 1994-12-28 1996-07-03 Toyota Jidosha Kabushiki Kaisha Self-lubricating composite powder alloy

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DE900103C (en) * 1943-02-20 1953-12-21 Patra Patent Treuhand Process for producing a material suitable for high-strength components and devices

Patent Citations (4)

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EP0118716A1 (en) * 1983-02-03 1984-09-19 Siemens Aktiengesellschaft Process for agglomerating metal powders or metal powder mixtures having a poor flowability
EP0310115A1 (en) * 1987-09-30 1989-04-05 Kawasaki Steel Corporation Iron base powder mixture and method
WO1994023868A1 (en) * 1993-04-13 1994-10-27 Hoeganaes Corporation Metal powder compositions containing binding agents for elevated temperature compaction
EP0719608A2 (en) * 1994-12-28 1996-07-03 Toyota Jidosha Kabushiki Kaisha Self-lubricating composite powder alloy

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000000656A1 (en) * 1998-06-30 2000-01-06 Aplicaciones De Metales Sinterizados, Sa High wear-resistance composite material, and parts obtained therewith
US7192464B2 (en) 2003-09-03 2007-03-20 Apex Advanced Technologies, Llc Composition for powder metallurgy
WO2011051293A1 (en) 2009-10-26 2011-05-05 Höganäs Ab Iron based powder composition
CN102666895A (en) * 2009-10-26 2012-09-12 霍加纳斯股份有限公司 Iron based powder composition
US8734561B2 (en) 2009-10-26 2014-05-27 Hoganas AB (Pub) Iron based powder composition
WO2014090922A3 (en) * 2012-12-14 2014-08-07 Höganäs Ab (Publ) Metal powder suitable for thermal spraying
EP2743361A1 (en) * 2012-12-14 2014-06-18 Höganäs AB (publ) New product and use thereof
CN104838024A (en) * 2012-12-14 2015-08-12 霍加纳斯股份有限公司 Metal powder for thermal spray
US9957590B2 (en) 2012-12-14 2018-05-01 Höganäs Ab (Publ) Metal powders and use thereof
US10513758B2 (en) 2012-12-14 2019-12-24 Höganäs Ab (Publ) Metal powders and use thereof
EP2781283A1 (en) * 2013-03-19 2014-09-24 Hitachi Chemical Company, Ltd. Iron base sintered sliding member and method for producing same
US9744591B2 (en) 2013-03-19 2017-08-29 Hitachi Chemical Company, Ltd. Iron base sintered sliding member and method for producing same
RU2690127C1 (en) * 2018-12-18 2019-05-30 Публичное акционерное общество "Северсталь" Method of producing powder mixture, which is ready for pressing of metallurgical parts
RU2692002C1 (en) * 2018-12-19 2019-06-19 Публичное акционерное общество "Северсталь" Method of producing complex-alloyed powder mixture, ready for molding

Also Published As

Publication number Publication date
JP4169369B2 (en) 2008-10-22
AU7845798A (en) 1998-07-03
DE19782155B4 (en) 2005-11-10
SE9604538D0 (en) 1996-12-10
DE19782155T1 (en) 1999-12-02
JP2001505957A (en) 2001-05-08

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