US3376171A - Copper alloy - Google Patents

Copper alloy Download PDF

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Publication number
US3376171A
US3376171A US591341A US59134166A US3376171A US 3376171 A US3376171 A US 3376171A US 591341 A US591341 A US 591341A US 59134166 A US59134166 A US 59134166A US 3376171 A US3376171 A US 3376171A
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US
United States
Prior art keywords
weight
alloy
alloys
copper
beryllium
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Expired - Lifetime
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US591341A
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English (en)
Inventor
Verdonk Anthonius Ca Wilhelmus
Kradolfer Pieter Johan Bernard
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Cirex NV
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Cirex NV
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Publication date
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Publication of US3376171A publication Critical patent/US3376171A/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
    • C22C9/00—Alloys based on copper

Definitions

  • ABSTRACT OF THE DISCLOSURE A method of manufacturing a fine-grained copper alloy in which an alloy of copper containing beryllium and between 1.25 and 2% by weight of cobalt are cast by heating the alloy to a temperature between 1100 and 1200 C.
  • This invention relates to copper alloys containing beryllium and cobalt as alloy elements which determine substantially the possibility of precipitation hardening of the alloy.
  • the alloys of this kind usually contain between 1.9 and 2.1% by weight of beryllium and about 0.35% by weight of cobalt.
  • such alloys after having been rolled, are usually annealed at about 800 C. for 2 to 3 hours in order completely to dissolve the beryllium. After quenching in water an alloy results which is softand excellently workable.
  • the alloy may be hardened by subsequent heating for some time at a temperature between 250" C. and 300 C. During the heating process beryllium is precipitated, resulting in a considerable increase in the hardness and tensile strength of the alloy. Further increase in hardness may be obtained if the alloy is cold deformed between quenching and tempering (age hardening).
  • the alloy is cast in molds in order directly to obtain therefrom an object in its definite shape it is not possible to give the object that hardness and tensile strength which are obtainable in objects which have been intermediately wrought, cold rolled or drawn.
  • the alloy may be obtained by putting together between 1.9 and 2.1% by weight of beryllium, between 1 and 2% by weight of cobalt and between 95.9 and 97.1% by weight of copper, following by melting together by methods usually employed in the manufacture of copper beryllium alloys.
  • a suitable manufacturing method consists in melting together, for example, 52% by weight of a copper alloy containing 4% by weight of beryllium, 1.25% by weight of cobalt and 46.75% by weight of copper in a ceramic crucible under nitrogen.
  • Alloys according to the invention are found to distinguish from the conventional alloys in the size of the grains formed during solidifying after the casting process. Alloys according to the invention permit obtaining castings having a very fine-grain structure wherein the lower limit is found to lie at about 1.0% by weight of Co. Upon casting an alloy of the composition 2% by weight of Be, 1.0% by weight of Co, and the remainder copper, the following was found:
  • the fine-granular structure obtained upon casting the alloys according to the invention which have a Co-content between 1% and 2%, has formed to be the very condition for maximum hardening after a treatment known as precipitation hardening and consisting in solution annealing, quenching and then tempering (age hardening).
  • the casting temperatures may be chosen between 1100 C. and 1200 C., but prefer ably near 1100 C. Coarse-grained structures occur at casting temperatures above 1200 C. for any percentage of cobalt.
  • Alloys of great hardness and tensile strength which are economically interesting are obtained with 1.9 to 2.0% by weight of Be, 1.25 to 1.35% by weight of Co, the rest copper.
  • Alloys according to the invention may also contain small amounts of silicon, magnesium, aluminium, iron and other metals as impurities. Amounts up to 0.5% by weight of iron, vanadium, and titanium or other impurities do not usually interfere with the good properties of Copper alloy contain- Hardness Tensile Maximum No. ing in percent by Treatment VPN/IO, strength, ductility weight kgJsq. mm. kg./sq. mm. in percent Be Co 1 2.1 0.3 Rolled, solution annealed at 800 0., 390420 135 1 quenched and 40% cold deformed and then precipitation hardening for maximum strength. 2 2.1 0.3 Cast, solution annealed at 800 0., 350 80 2 quenched and precipitation hardening tor maximum strength. 3 2.0 1. Cast, solution annealed at 800 C. tor 1 410 135 1.5 hour, quenched and heated at 350 C. for 4.5 hours.
  • pick-locks were manufactured from the alloy (2% of Be, 125% of Co, rest copper) by precision casting.
  • the pick-locks were equivalent to wroughtsteel spanners with equal thickness and strength (Rockwell-Vickers and Brinell hardness and maximum bending moment without permanent deformation).
  • Alloys in accordance with the invention may be used inter alia for the manufacture of machine parts requiring, in addition to a high tensile strength, satisfactory thermal and electrical conductivity and for the manufacture of sparkless tools by casting.
  • alloys it is possible to obtain a considerable saving in the manufacturing cost of such products.
  • the alloy is thus especially suitable for so-called precision casting.
  • Copper alloys which contain, in addition to beryllium, between 1 and 2% by weight of cobalt are known.
  • such known cast alloys contain an amount of beryllium which is considerably less, usually less than 1% by weight. The maximum strength obtainable with such alloys is smaller than that obtained with alloys in accordance with the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Conductive Materials (AREA)
  • Powder Metallurgy (AREA)
US591341A 1963-04-11 1966-11-01 Copper alloy Expired - Lifetime US3376171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL291498 1963-04-11

Publications (1)

Publication Number Publication Date
US3376171A true US3376171A (en) 1968-04-02

Family

ID=19754612

Family Applications (1)

Application Number Title Priority Date Filing Date
US591341A Expired - Lifetime US3376171A (en) 1963-04-11 1966-11-01 Copper alloy

Country Status (8)

Country Link
US (1) US3376171A (de)
AT (1) AT248709B (de)
BE (1) BE646356A (de)
CH (1) CH456165A (de)
DE (1) DE1458447A1 (de)
ES (1) ES298482A1 (de)
GB (1) GB1065863A (de)
NL (1) NL291498A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4867583A (en) * 1982-12-15 1989-09-19 Genicom Corporation Dot matrix printer/module using print wires having different lenth but equal mass
US20150329277A1 (en) * 2012-04-02 2015-11-19 Huhtamaki Molded Fiber Technology B.V. Packaging unit for products like eggs, and mould and method there for
CN115069977A (zh) * 2022-07-15 2022-09-20 广东省科学院佛山产业技术研究院有限公司 一种模具用铜铍钴合金板及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2088219A (en) * 1935-03-14 1937-07-27 American Brass Co Alloy
US2166794A (en) * 1936-11-27 1939-07-18 Gen Electric Copper-cobalt-beryllium alloys
US2172639A (en) * 1939-09-12 Copper base allots
US2192495A (en) * 1933-06-17 1940-03-05 Heraeus Vacuumschmelze Ag Beryllium-copper alloys

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2172639A (en) * 1939-09-12 Copper base allots
US2192495A (en) * 1933-06-17 1940-03-05 Heraeus Vacuumschmelze Ag Beryllium-copper alloys
US2088219A (en) * 1935-03-14 1937-07-27 American Brass Co Alloy
US2166794A (en) * 1936-11-27 1939-07-18 Gen Electric Copper-cobalt-beryllium alloys

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4867583A (en) * 1982-12-15 1989-09-19 Genicom Corporation Dot matrix printer/module using print wires having different lenth but equal mass
US20150329277A1 (en) * 2012-04-02 2015-11-19 Huhtamaki Molded Fiber Technology B.V. Packaging unit for products like eggs, and mould and method there for
CN115069977A (zh) * 2022-07-15 2022-09-20 广东省科学院佛山产业技术研究院有限公司 一种模具用铜铍钴合金板及其制备方法

Also Published As

Publication number Publication date
GB1065863A (en) 1967-04-19
CH456165A (de) 1968-05-15
NL291498A (de)
DE1458447A1 (de) 1969-03-06
ES298482A1 (es) 1964-09-01
BE646356A (de) 1964-10-09
AT248709B (de) 1966-08-10

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