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Sintered iron based articles infiltrated with copper based metals

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Publication number
US3829295A
US3829295A US29736372A US3829295A US 3829295 A US3829295 A US 3829295A US 29736372 A US29736372 A US 29736372A US 3829295 A US3829295 A US 3829295A
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Prior art keywords
copper
sintered
article
alloy
skeleton
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Expired - Lifetime
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E Farmer
T Cadle
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Federal-Mogul Sintered Products Ltd
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Federal-Mogul Sintered Products Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/02Making ferrous alloys by powder metallurgy
    • C22C33/0242Making ferrous alloys by powder metallurgy using the impregnating technique
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/12All metal or with adjacent metals
    • Y10T428/12014All metal or with adjacent metals having metal particles
    • Y10T428/1216Continuous interengaged phases of plural metals, or oriented fiber containing
    • Y10T428/12167Nonmetal containing

Abstract

A SINTERED METAL ARTICLE INCLUDING A SINTERED SKELECTION HAVING THE COMPOSITION 1.5-2.0% NICKEL, 0.3-0.7% MOLYBEDNUM, 1-2% COPPER, 0.1-.3% CARBON, NOT MORE THAN 2% OF MANGANESE, SILICON, SULPHUR, AND PHOSPHORUS TOGETHER (PERCENTAGES BEING BY WEIGHT), THE REMAINDER (APART FROM IMPURITIES AND TRACE ELEMENTS) BEING IRON, THE SINTERED SKELETON BEING INFILTRATED WITH COPPER OR COPPER-BASE ALLOY, AND THE ARTICLE BEING CASE-HARDENED.

Description

3,829,295 SINTERED IRON BASED ARTICLES INFILTRATED WITH COPPER BASED METALS Edwin Bruce Farmer and Terence Michael Cadle, Coventry, England, assignors to Brico Engineering Limited, Coventry, England No Drawing. Filed Oct. 13, 1972, Ser. No. 297,363 Claims priority, application Great Britain, Oct. 23, 1971, 49,345/71 Int. Cl. B22f 3/26 US. Cl. 29-1821 6 Claims ABSTRACT OF THE DISCLOSURE A sintered metal article including a sintered skeleton having the composition 1.5-2.0% Nickel, 0.30.7% Molybdenum, 1-2% Copper, 0.1-0.3% Carbon, not more than 2% of Manganese, Silicon, Sulphur, and Phosphorus together (percentages being by weight), the remainder (apart from impurities and trace elements) being Iron, the sintered skeleton being infiltrated with Copper or Copper-based alloy, and the article being case-hardened.

This invention relates to sintered metal articles and to processes for their manufacture.

According to this invention in one aspect, a sintered metal article includes a sintered skeleton having the composition 1.5-2.0% Nickel, 0.3-0.7% Molybdenum, 1-2% Copper, 0.10.3% Carbon, not more than 2% of Manganese, Silicon, Sulphur and Phosphorus together (percentages being by weight), the remainder (apart from impurities and trace elements) being Iron, the sintered skeleton being infiltrated with Copper, or Copper-based alloy, and the article being case hardened.

Preferably the skeleton has substantially 1.75% Nickel, 0.5% Molybdenum. 1.5% Copper, 0.25% Combined Carbon.

According to this invention in another aspect, a process for the manufacture of sintered metal articles includes the steps of producing a sintered skeleton having the composition l.5-2.0% Nickel, 0.30.7% Molybdenum, 12% Copper, 0.l0.3% Carbon, not more than 2% of Manganese, Silicon, Sulphur and Phosphorus together, the remainder (apart from impurities and trace elements) being Iron, infiltrating the skeleton with Copper or Copper-based alloy in an amount between 8% and 25% of the skeleton, and then case-hardening the infiltrated article.

Preferably the sintered skeleton is infiltrated with 14% Copper or Copper-based alloy.

A process for the manufacture of articles in accordance with the invention will now be described by way of example.

A pre-alloy or partial pre-alloy in the form of a powder of less than 100 13.8. mesh size and the following composition is selected:

Percent Ni 1.5-2 Mo 0.3-0.7 Cu 1.0-2.0 Mn, Si, S, P Fe Remainder 1 Not exceeding 2% in total. (all the percentages in the specification are by weight).

This pre-alloy or partial pre-alloy powder is mixed with 01-03% (of the weight of the pre-alloy powder) of Carbon, in the form of graphite, and preferably with a small percentage e.g. 1% of a suitable lubricant such as Zinc Stearate. The constituents are thoroughly mixed in a suitable mixer.

3,829,295 Patented Aug. 13, 1974 The mixture is then pressed at 30-45 tons/sq. in. in a suitable powder metallurgy press, and sintered in a protective atmosphere, for example, a reducing atmosphere of dried cracked Ammonia or a Carbonaceous atmosphere of Endothermic Gas at a temperature in the range 1090 C.-ll20 C. for between 20 and 30 minutes. The lubricant disappears in the sintering process.

The sintered article or skeleton is then infiltrated with Copper or Copper-based alloy in an amount equal to between 8 and 25 of the weight of the article, for example, by placing the article in a suitable mould having walls which extend above the article and placing Copper or Copper-based alloy powder on the article, between the walls. The article is then heated in an oven to a temperature significantly above the melting point of Copper or its alloy, so that all the molten Copper or Copper-based alloy infiltrates into the pores of the article; the time of heating is such as to allow the Copper or Copper-based alloy to infiltrate the article uniformly.

Suitable Copper-based alloys are Copper plus 3% Cobalt, or Copper plus 5% Iron and 5% Manganese.

After infiltration the article is then case-hardened either by Carburising, Carbo-Nitriding or any other known or convenient method of Carbon case-hardening.

In one particular example the pre-alloy powder contained 1.75% Nickel, 0.5% Molybdenum, 1.5% Copper, which was mixed with 0.25% Graphite and 1% Zinc Stearate. After sintering in the above manner the skeleton was impregnated with 14% Copper.

The ultimate tensile strength of the article is shown by the following table:

Condition UTS, tons/sq. in. As sintered 27 Sintered and case-hardened 46 Sintered, infiltrated and case-hardened 65 Condition UTS, tons/sq. in. As sintered 27 Sintered and case-hardened 41 Infiltrated and case hardened 40 Other physical properties of articles made in accordance with the invention have been measured as follows:

Density gm./cc 7.0-8.0 Transverse rupture modulus p.s.i. 270,000 Impact strength (unnotched Charpy) ft. lb 27 We claim:

1. A sintered metal article consisting of a sintered skeleton infiltrated with copper or copper-based alloy, the skeleton having the composition, in percentages by weight:

Percent Nickel l.5-2.0

Molybdenum 0.3-0.7

Copper 1-2 Carbon 0. l0.3 Manganese, Silicon, Sulphur and phosphorus together Not exceeding 2 Iron (with impurities and trace elements) 93.0-97.1

3 4 the skeleton being infiltrated with Copper or Copper-based References Cited alloy, and the article being case-hardened after infiltration. UNITED STATES PATENTS 2. A sintered metal article, according to Claim 1, in whi h th skeleton has substantially 1.75% Nickel, 0.5% 3414391 12/1968 Brab 29' 182'1 Mo1ybdenum,1 5% COpper0 25% Carbon 3,694,173 9/1972 Farmer et al. 29182.1

3. A sintered metal article, according to Claim 1, in FOREIGN PATENTS which the infiltrated Copper or Copper-based alloy 1,071,3 3 19 7 Great i i 29 1 2 1 amounts to 8-25% of the skeleton. 720,050 12/1954 Great Britain 29-182.1

4. A sintered metal article, according to Claim 3, infiltrated with 14% Copper or Copper-based alloy. 10 C L D- Q ARFORTH, Primary Examiner 5. A sintered metal article, according to Claim 1, which 13 HUNT Assistant Examiner is case-hardened by carburising.

6. A sintered metal article, according to Claim 1, which US. Cl. X.R. is case-hardened by carbo-nitriding. 15 29--182.5, 182.7

US3829295A 1971-10-23 1972-10-13 Sintered iron based articles infiltrated with copper based metals Expired - Lifetime US3829295A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4934571A GB1399812A (en) 1971-10-23 1971-10-23 Sintered metal articles

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US3829295A true US3829295A (en) 1974-08-13

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US (1) US3829295A (en)
JP (1) JPS5323761B2 (en)
DE (1) DE2251909C2 (en)
FR (1) FR2157563A5 (en)
GB (1) GB1399812A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983615A (en) * 1973-02-09 1976-10-05 Toyo Kogyo Co., Ltd. Sliding seal member for an internal combustion engine
US4271239A (en) * 1977-07-20 1981-06-02 Brico Engineering Limited Sintered metal articles and process for their manufacture
US4327156A (en) * 1980-05-12 1982-04-27 Minnesota Mining And Manufacturing Company Infiltrated powdered metal composite article
US5145504A (en) * 1991-07-08 1992-09-08 The Dow Chemical Company Boron carbide-copper cermets and method for making same
US5507336A (en) * 1995-01-17 1996-04-16 The Procter & Gamble Company Method of constructing fully dense metal molds and parts
US5906781A (en) * 1996-10-24 1999-05-25 The Procter & Gamble Company Method of using thermally reversible material to form ceramic molds
US5918293A (en) * 1994-05-27 1999-06-29 Hoganas Ab Iron based powder containing Mo, P and C
US5927373A (en) * 1996-10-24 1999-07-27 The Procter & Gamble Company Method of constructing fully dense metal molds and parts
US20060180251A1 (en) * 2005-02-11 2006-08-17 Paul Rivest Copper-based alloys and their use for infiltration of powder metal parts
US20080107558A1 (en) * 2004-02-04 2008-05-08 Gkn Sinter Metals, Inc. Sheet Material Infiltration of Powder Metal Parts
WO2010074627A1 (en) * 2008-12-22 2010-07-01 Höganäs Ab (Publ) Machinability improving composition

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984158A (en) * 1973-09-10 1976-10-05 Dresser Industries, Inc. Journal and pilot bearings with alternating surface areas of wear resistant and anti-galling materials
JPS5224613A (en) * 1975-08-19 1977-02-24 Nippon Piston Ring Co Ltd Sliding move part material made of ferrous system sintered alloy for i nternal combustion engine and forming method of its sliding move surfa ce
GB2087929B (en) * 1980-11-19 1985-01-09 Brico Eng Sintered metal articles and their manufacture
CA1297705C (en) * 1985-07-15 1992-03-24 Mark Svilar High impact strength powder metal part and method for making same
US6676894B2 (en) * 2002-05-29 2004-01-13 Ntn Corporation Copper-infiltrated iron powder article and method of forming same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1071863A (en) * 1965-03-15 1967-06-14 Mitsubishi Kinzoku Kogyu Kabus Lead-impregnated,iron-base,sintered alloy materials for current-collecting slider shoes

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983615A (en) * 1973-02-09 1976-10-05 Toyo Kogyo Co., Ltd. Sliding seal member for an internal combustion engine
US4271239A (en) * 1977-07-20 1981-06-02 Brico Engineering Limited Sintered metal articles and process for their manufacture
DK155982B (en) * 1977-07-20 1989-06-12 Brico Eng Sintered metal target and process for obtaining it and its use.
US4327156A (en) * 1980-05-12 1982-04-27 Minnesota Mining And Manufacturing Company Infiltrated powdered metal composite article
US5145504A (en) * 1991-07-08 1992-09-08 The Dow Chemical Company Boron carbide-copper cermets and method for making same
US5918293A (en) * 1994-05-27 1999-06-29 Hoganas Ab Iron based powder containing Mo, P and C
US5507336A (en) * 1995-01-17 1996-04-16 The Procter & Gamble Company Method of constructing fully dense metal molds and parts
US5906781A (en) * 1996-10-24 1999-05-25 The Procter & Gamble Company Method of using thermally reversible material to form ceramic molds
US5927373A (en) * 1996-10-24 1999-07-27 The Procter & Gamble Company Method of constructing fully dense metal molds and parts
US20080107558A1 (en) * 2004-02-04 2008-05-08 Gkn Sinter Metals, Inc. Sheet Material Infiltration of Powder Metal Parts
US20060180251A1 (en) * 2005-02-11 2006-08-17 Paul Rivest Copper-based alloys and their use for infiltration of powder metal parts
US7341093B2 (en) 2005-02-11 2008-03-11 Llc 2 Holdings Limited, Llc Copper-based alloys and their use for infiltration of powder metal parts
US20080138237A1 (en) * 2005-02-11 2008-06-12 Paul Rivest Copper-based alloys and their use for infiltration of powder metal parts
WO2010074627A1 (en) * 2008-12-22 2010-07-01 Höganäs Ab (Publ) Machinability improving composition
US8795407B2 (en) 2008-12-22 2014-08-05 Hoganas Ab (Publ) Machinability improving composition
US9393617B2 (en) 2008-12-22 2016-07-19 Hoganas Ab (Publ) Machinability improving composition

Also Published As

Publication number Publication date Type
GB1399812A (en) 1975-07-02 application
FR2157563A5 (en) 1973-06-01 application
JPS5323761B2 (en) 1978-07-17 grant
DE2251909A1 (en) 1973-04-26 application
DE2251909C2 (en) 1983-10-27 grant
JPS4850907A (en) 1973-07-18 application

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