EP0170651B1 - Ausscheidungsverfestigte kupfer-metall-legierung - Google Patents

Ausscheidungsverfestigte kupfer-metall-legierung Download PDF

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Publication number
EP0170651B1
EP0170651B1 EP19840901031 EP84901031A EP0170651B1 EP 0170651 B1 EP0170651 B1 EP 0170651B1 EP 19840901031 EP19840901031 EP 19840901031 EP 84901031 A EP84901031 A EP 84901031A EP 0170651 B1 EP0170651 B1 EP 0170651B1
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EP
European Patent Office
Prior art keywords
copper
powder
dispersion strengthened
process according
alloy
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.)
Expired
Application number
EP19840901031
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English (en)
French (fr)
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EP0170651A1 (de
EP0170651A4 (de
Inventor
Anil V. Nadkarni
Prasanna K. Samal
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.)
SCM Corp
Original Assignee
SCM Corp
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Filing date
Publication date
Application filed by SCM Corp filed Critical SCM Corp
Publication of EP0170651A1 publication Critical patent/EP0170651A1/de
Publication of EP0170651A4 publication Critical patent/EP0170651A4/de
Application granted granted Critical
Publication of EP0170651B1 publication Critical patent/EP0170651B1/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0021—Matrix based on noble metals, Cu or alloys thereof

Definitions

  • dispersion strengthened copper is present in an amount greater than 50%, generally from 55% to 98% by weight, balance alloying metal or metals, and most usefully about 90% by weight.
  • the extent of refractory oxide in the DSC is calculated as the metal equivalent broadly and ranges from 0.05% to 5%.
  • aluminum oxide as the metal
  • a series of commercially available products of this type are marketed under the trademark "Glidcop", a registered trademark of SCM Corporation. These materials have particle sizes in the range of .1 to 180 pm.
  • the process of the present invention utilizes several steps to achieve chemical homogeneity in the alloy and to supress the formation of tin oxides. Homogeneity of alloying is achieved most satisfactorily by properly blending the tin powder prior to canning and by solution annealing the extruded fully dense bar. Prevention of tin oxide formation is achieved by heat-treating of the powder mix in protective atmosphere prior to extrusion.
  • the annexed drawing illustrates the process of the invention as applied to a dispersion strengthened bronze.
  • “GlidCop” (AL-20) DSC powder from a production lot was blended with 1% by weight of a suitable powder metallurgy lubricant, for example 1% zinc-stearate powder, in a double cone blender for 20 minutes. Desired amounts of highest purity tin powder was added to the DSC powder and blending was continued for 30 minutes more. The blended powder was then fed into billet cans.
  • a suitable powder metallurgy lubricant for example 1% zinc-stearate powder
  • the bar was cold worked to the desired temper and then machined into tensile test specimens conforming to ASTM specifications. Some of the strips were annealed at different temperatures ranging from 482°C to 677°C (900°F to 1250°F), before testing. Nitrogen atmosphere was used in the furnaces for annealing runs.
  • Tensile strength and yield strength data are plotted as a function of amount of cold work in Figure 2, and as a function of annealing temperature in Figure 3. Since the samples were cold worked by rolling strips, the starting thickness of the extruded bar posed some limitations on the maximum amount of cold work that could be given without making the strip too thin for performing tensile testing.
  • the ultimate tensile strength of DSB is considerably higher than that of Phosphor Bronze, having the same chemical composition and same amount of cold work.
  • the yield strength of DSB is also considerably greater than that of Phosphor Bronze having the same chemical composition and same amount of cold work.
  • Phosphor Bronze exhibits a sharp drop in both ultimate tensile strength and yield strength.
  • D.S.B. in contrast to Phosphor Bronze, retains its strength quite well after exposure to these high tempeatures. In this respect it is similar to "GiidCop".
  • D.S.B. work-hardens more rapidly than "GiidCop". In this respect it is similar to Phosphor Bronze, except that D.S.B. exhibits substantially higher yield strength and tensile strength for same levels of cold work.
  • a straight-line shape of stress-strain curve is highly desirable.
  • D.S.B. is more suitable as a spring material than "GlidCop".
  • the modulus of elasticity of all three materials is considered to be nearly the same, namely 110 GPa (16,000,000 psi).
  • DSB is found to be superior to Phosphor Bronze of similar chemistry due to its higher yield strength and tensile strength upon cold working, and due to its ability to retain most of the strength after exposure to temperatures normally anticipated in brazing operations, namely 482°C ⁇ 649°C (900°F-1200°F). Although one can achieve the strength levels attained in cold worked D.S.B., by taking a Phosphor Bronze of higher tin content, DSB is considered attractive, for two basic reasons: (1) D.S.B.

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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 Alloys Or Alloy Compounds (AREA)

Claims (8)

1. Verfahren zum Erzeugen einer modifizierten dispersionsverfestigten Kupferlegierung, in dem eine größere Menge eines vorher hergstellten, nichtmodifizierten innenoxidierten dispersionsverfestigten Kufperpulvers, das 0,05 bis 5 Gew.% eines hochschmelzenden Metalloxids zum Verfestigen des Kupfers und eine kleiners Menge eines oder mehrerer pulverförmiger modifizierender anderer Metalle als Kupfer enthält, die mit Kupfer legierbar sind, miteinander vermengt werden und das Gemenge auf eine Temperatur erhitzt wird, die unter dem Schmelzpunkt des Kupfers liegt und die zum Legieren mindestens eines Teils des bzw. der modifizierenden Metalls bzw. der modifizierenden Metalle mit dem Kupfer genügt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das teillegierte Pulvergemenge auf eine Dichte von mindestens 90% seiner theoretischen Dichte gepreßt und verdichtet wird.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Pulver in eine Kupferdose eingebracht und das eingedoste Pulver derart extrudiert wird, daß eine maximale Dichte erzielt und ein ummanteltes verdichtetes Produkt erhalten wird.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Kupfermantel entfernt wird.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zum Erzeugen des dispersionsverfestigten Kupferpulvers ein von einem oxidischen Überflächenüberzug im wesentlichen freies Pulver aus einer Kupfer/Aluminium-Legierung innenoxidiert wird.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das innenerzeugte hochschmelzende Metalloxid Aluminiumoxid ist.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das modifizierende Metall wenigstens teilweise aus Zinn besteht.
8. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mindestens ein Teil des modifizierenden Metalls oder der modifizierenden Metalle durch Feststoffdiffusion zulegiert wird.
EP19840901031 1984-01-31 1984-01-31 Ausscheidungsverfestigte kupfer-metall-legierung Expired EP0170651B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1984/000128 WO1985003463A1 (en) 1984-01-31 1984-01-31 Metal modified dispersion strengthened copper

Publications (3)

Publication Number Publication Date
EP0170651A1 EP0170651A1 (de) 1986-02-12
EP0170651A4 EP0170651A4 (de) 1986-07-24
EP0170651B1 true EP0170651B1 (de) 1989-08-16

Family

ID=22182029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840901031 Expired EP0170651B1 (de) 1984-01-31 1984-01-31 Ausscheidungsverfestigte kupfer-metall-legierung

Country Status (4)

Country Link
EP (1) EP0170651B1 (de)
JP (1) JPS61501097A (de)
DE (1) DE3479407D1 (de)
WO (1) WO1985003463A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8723915D0 (en) * 1987-10-12 1987-11-18 Atomic Energy Authority Uk Dispersion-strengthened power metallurgy products

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026200A (en) * 1956-10-11 1962-03-20 134 Woodworth Corp Method of introducing hard phases into metallic matrices
US3085876A (en) * 1960-03-01 1963-04-16 Du Pont Process for dispersing a refractory metal oxide in another metal
GB941886A (en) * 1960-06-13 1963-11-13 Du Pont Improvements in or relating to metalliferous compositions
US3143789A (en) * 1962-08-31 1964-08-11 Du Pont Dispersion strengthened metal composition
DE1533377B1 (de) * 1966-08-12 1969-10-02 Siemens Ag Verfahren zur inneren Oxydation von Legierungspulver oder einer teilweise legierten Metallpulvermischung
US3552954A (en) * 1968-09-20 1971-01-05 Handy & Harman Method of making internally oxidized dispersion hardened copper product
US3884676A (en) * 1972-01-13 1975-05-20 Scm Corp Dispersion strengthening of metals by in-can processing
US3893844A (en) * 1972-01-13 1975-07-08 Scm Corp Dispersion strengthened metals
US3779714A (en) * 1972-01-13 1973-12-18 Scm Corp Dispersion strengthening of metals by internal oxidation
US4274873A (en) * 1979-04-09 1981-06-23 Scm Corporation Dispersion strengthened metals
US4315777A (en) * 1979-08-07 1982-02-16 Scm Corporation Metal mass adapted for internal oxidation to generate dispersion strengthening
US4315770A (en) * 1980-05-02 1982-02-16 Scm Corporation Dispersion strengthened metals

Also Published As

Publication number Publication date
WO1985003463A1 (en) 1985-08-15
EP0170651A1 (de) 1986-02-12
DE3479407D1 (en) 1989-09-21
JPS61501097A (ja) 1986-05-29
EP0170651A4 (de) 1986-07-24

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