US3853551A - Method of sintering iron, copper tin alloys followed by slow cooling - Google Patents

Method of sintering iron, copper tin alloys followed by slow cooling Download PDF

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Publication number
US3853551A
US3853551A US00266443A US26644372A US3853551A US 3853551 A US3853551 A US 3853551A US 00266443 A US00266443 A US 00266443A US 26644372 A US26644372 A US 26644372A US 3853551 A US3853551 A US 3853551A
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United States
Prior art keywords
copper
sintering
tin
shaped body
temperature
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Expired - Lifetime
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US00266443A
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English (en)
Inventor
F Esper
R Zeller
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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    • 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

Definitions

  • ABSTRACT A sintered shaped body comprises 0.5 to 3% tin, 2 to 14% copper, balance iron, the ratio of tin to copper being between 1:2 and 1:9.
  • the bodies are made by sintering an alloy as indicated at'a temperature of about 900 to l100C for a time from about 20 to 60 minutes.
  • the bodies are distinguished by a high elongation at break together with high tensile strength.
  • Sintered alloys of tin, copper, balance iron have long been known. It is also known that by careful selection of the composition fairly good values for the tensile strength can be obtained. However, so far the values for the elongation have always been low. This entire group of alloys, at least to the extent that th e iron portion predominated, was therefore only of very limited use. On the other hand this type of sintered alloy could be of substantial practical interest if one substitutes tin for nickel. The latter requires a substantially lower sintering temperature. Besides nickel is frequently available only with difficulties.
  • the sintered bodies are made by sintering a powder mixture of the above mentioned composition at a temperature of about 900 to 1 100C for a time from about 20 to 60 minutes.
  • FIGURE of the drawing is a graphic representation wherein on the horizontal axis the temperatures are recorded at which the quenching after sintering or the tempering after sintering is performed.
  • the vertical axis shows the values for the elongation at break (8) and the values for the tensile strength
  • the solid curve relates to the elongation at break while the dashed curve represents the tensile strength.
  • a preferred ratio between tin and copper is in the range of 1:4.
  • a heat treatment following the sintering step it is preferred to employ a heat treatment following the sintering step.
  • the sintering itself is preferably carried out at a temperature between 900 and l100 for between 20 and 60 minutes in all three alternative embodiments of the thermal after-treatment. This aftertreatment is effected immediately following the sintering step.
  • the three alternatives are as follows:
  • the shaped bodies immediately after sintering are cooled down to a temperature between 520 and 750C with a rate 2 l5C/min. This is followed by quenching.
  • the specific quenching temperature within the range to which the bodies are cooled depends on the desired values for the elongation at break or tensile strength and can be easily selected according to the accompanying drawing.
  • the formed bodies immediately after sintering are subjected to a slow cooling to room temperature. They are thereafter subjected to a tempering treatment for between 15 minutes and 5 hours at a temperature between 520C and 750C. This is followed by quenching.
  • the specific'tempering temperature within the range stated again depends on the desired values for the elongation at break or the tensile strength which can be found in the attached drawing.
  • the formed bodies are cooled to a temperature of 300C with a cooling speed 27C/min. After that they are permitted to cool in a protective gas atmosphere.
  • EXAMPLE 1 This Example illustrates the properties of different shaped bodies having slightly different compositions when made by the process of the invention.
  • This Example illustrates the properties of shaped bodies made from pure sintered iron, from a sintered iron alloy containing copper and a sintered iron alloy containing copper and nickel. In all cases the sintering of the shaped bodies was effected for 60 minutes at 1 C in a protective gas atmosphere.

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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)
US00266443A 1971-08-26 1972-06-26 Method of sintering iron, copper tin alloys followed by slow cooling Expired - Lifetime US3853551A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2142708A DE2142708C3 (de) 1971-08-26 1971-08-26 Verfahren zur Nachbehandlung von Sinterkörpern aus Eisen, Kupfer und Zinn

Publications (1)

Publication Number Publication Date
US3853551A true US3853551A (en) 1974-12-10

Family

ID=5817813

Family Applications (1)

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US00266443A Expired - Lifetime US3853551A (en) 1971-08-26 1972-06-26 Method of sintering iron, copper tin alloys followed by slow cooling

Country Status (11)

Country Link
US (1) US3853551A (it)
JP (1) JPS4831106A (it)
AT (1) AT325083B (it)
CH (1) CH530471A (it)
DE (1) DE2142708C3 (it)
ES (1) ES406097A1 (it)
FR (1) FR2151254A5 (it)
GB (1) GB1336268A (it)
IT (1) IT947216B (it)
NL (1) NL7201497A (it)
SE (1) SE384532B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158719A (en) * 1977-06-09 1979-06-19 Carpenter Technology Corporation Low expansion low resistivity composite powder metallurgy member and method of making the same
US4707184A (en) * 1985-05-31 1987-11-17 Scm Metal Products, Inc. Porous metal parts and method for making the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330630A (en) * 1965-08-10 1967-07-11 Manganese Bronze Ltd Sintered porous bearing of fe and a powdered cu-base alloy
US3647573A (en) * 1969-06-05 1972-03-07 Bell Telephone Labor Inc Method of making a bronze-iron composite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330630A (en) * 1965-08-10 1967-07-11 Manganese Bronze Ltd Sintered porous bearing of fe and a powdered cu-base alloy
US3647573A (en) * 1969-06-05 1972-03-07 Bell Telephone Labor Inc Method of making a bronze-iron composite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Esper et al., Sintering Reactions Radial Compression Strength of Iron Tin and Iron Copper Tin Powder Compacts, International Journal of Powder Metallurgy, Vol. 5, No. 3, 1969, TN695 I56. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158719A (en) * 1977-06-09 1979-06-19 Carpenter Technology Corporation Low expansion low resistivity composite powder metallurgy member and method of making the same
US4707184A (en) * 1985-05-31 1987-11-17 Scm Metal Products, Inc. Porous metal parts and method for making the same

Also Published As

Publication number Publication date
DE2142708B2 (de) 1978-03-16
SE384532B (sv) 1976-05-10
AT325083B (de) 1975-10-10
ES406097A1 (es) 1976-02-01
GB1336268A (en) 1973-11-07
FR2151254A5 (it) 1973-04-13
CH530471A (de) 1972-11-15
JPS4831106A (it) 1973-04-24
DE2142708A1 (de) 1973-03-01
DE2142708C3 (de) 1978-11-09
IT947216B (it) 1973-05-21
NL7201497A (it) 1973-02-28

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