EP0170651B1 - Cuivre durci par precipitation et modifie par un metal - Google Patents

Cuivre durci par precipitation et modifie par un metal 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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German (de)
English (en)
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EP0170651A1 (fr
EP0170651A4 (fr
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/fr
Publication of EP0170651A4 publication Critical patent/EP0170651A4/fr
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Publication of EP0170651B1 publication Critical patent/EP0170651B1/fr
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Classifications

    • 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)

Abstract

Procédé pour fabriquer un nouvel alliage d'un cuivre durci par précipitation en mélangeant du cuivre durci par précipitation en poudre et un métal modificateur pulvérisé, en soumettant le mélange à un traitement thermique pour former l'alliage, puis en compactant et en travaillant le produit compact pour le rendre plus dense.

Claims (8)

1. Procédé pour préparer un alliage de cuivre durci par dispersion modifié qui comporte le mélange d'une partie majeure de poudre de cuivre durci par dispersion non modifiée à oxydation interne préconstituée contenant de 0,05 à 5% en poids d'un oxyde métallique réfractaire pour durcir le cuivre, et une quantité mineure d'au moins un métal modificateur pulvérulent différent du cuivre mais pouvant s'y allier, et chauffage dudit mélange à une température inférieure au point de fusion du cuivre et suffisante pour allier au cuivre au moins une partie dudit métal modificateur ou desdits métaux.
2. Procédé suivant la revendication 1, caractérisé par le compactage et la densification de la poudre mélangée et partiellement alliée à au moins 90% de la densité théorique.
3. Procédé suivant la revendication 1 ou 2, caractérisé par la mise en place de la poudre dans une enveloppe de cuivre et l'extrusion de la poudre enveloppée pour atteindre la densité maximale et produire un produit densifié gainé.
4. Procédé suivant la revendication 3, caractérisé par l'enlèvement de la gaine de cuivre.
5. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait que la poudre de cuivre durci par dispersion est obtenue par oxydation interne d'une poudre d'alliage cuivre/aluminium qui est sensiblement dépourvue de revêtement d'oxyde superficiel.
6. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait que l'oxyde métallique réfractaire à formation interne est de l'alumine.
7. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait que le métal modificateur comprend l'étain.
8. Procédé suivant l'une quelconque des revendications précédentes, caractérisé par le fait que l'alliage d'une partie au moins dudit métal modificateur ou desdits métaux s'effectue par diffusion en état solide.
EP19840901031 1984-01-31 1984-01-31 Cuivre durci par precipitation et modifie par un metal Expired EP0170651B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1984/000128 WO1985003463A1 (fr) 1984-01-31 1984-01-31 Cuivre durci par precipitation et modifie par un metal

Publications (3)

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

Family

ID=22182029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840901031 Expired EP0170651B1 (fr) 1984-01-31 1984-01-31 Cuivre durci par precipitation et modifie par un metal

Country Status (4)

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

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
US3779714A (en) * 1972-01-13 1973-12-18 Scm Corp Dispersion strengthening of metals by internal oxidation
US3893844A (en) * 1972-01-13 1975-07-08 Scm Corp Dispersion strengthened metals
US3884676A (en) * 1972-01-13 1975-05-20 Scm Corp Dispersion strengthening of metals by in-can processing
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 (fr) 1985-08-15
JPS61501097A (ja) 1986-05-29
DE3479407D1 (en) 1989-09-21
EP0170651A1 (fr) 1986-02-12
EP0170651A4 (fr) 1986-07-24

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