EP0190648A1 - Goldlegierung - Google Patents

Goldlegierung Download PDF

Info

Publication number
EP0190648A1
EP0190648A1 EP86101121A EP86101121A EP0190648A1 EP 0190648 A1 EP0190648 A1 EP 0190648A1 EP 86101121 A EP86101121 A EP 86101121A EP 86101121 A EP86101121 A EP 86101121A EP 0190648 A1 EP0190648 A1 EP 0190648A1
Authority
EP
European Patent Office
Prior art keywords
gold
titanium
alloy
temperature
jewellery
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.)
Withdrawn
Application number
EP86101121A
Other languages
English (en)
French (fr)
Inventor
Geoffrey Gafner
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.)
International Gold Corp Ltd
Original Assignee
International Gold Corp Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Gold Corp Ltd filed Critical International Gold Corp Ltd
Publication of EP0190648A1 publication Critical patent/EP0190648A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold

Definitions

  • THIS INVENTION relates to a gold alloy.
  • the alloy may particularly be used for the production of jewellery, coins or gold bars.
  • a gold alloy containing gold and 0.1 to 4.0 % mass by mass (m/m) of titanium.
  • the alloy may particularly be used for the production of jewellery, coins or gold bars.
  • The. invention extends to a method of manufacturing a gold alloy which includes
  • titanium is very suitable to alloy with gold. It has solubilities of about 2.2 % m/m at 1000°C, 1.2% at 800°C and 0.5% at 500°C.
  • the hardening phase formed in the solid state is Au 4 Ti.
  • one % m/m of titanium in gold represents more than 4 atomic % due to the atomic weights of 48 and 197 which the two metals possess respectively.
  • the titanium also gives the gold an attractive lighter yellow colour.
  • the alloy preferably has 0.5 to 1.5 % m/m titanium and most preferably has 1 % m/m titanium.
  • Titanium fulfils the following requirements that an effective hardening agent for gold with a millesimal finess of 990 should have:
  • titanium metal reacts with both oxygen and nitrogen on heating, and is normally covered with a very thin skin of oxide and/or nitride. This skin acts as a barrier and impedes solution of the titanium in the gold during alloy production. Thus the titanium should be in bulk form with minimal surface area.
  • the gold and titanium were heated and melted in a ceramic crucible to a temperature of about 1300°C in a medium vacuum which must not be better than 10 -2 Torr or evaporation of the molten gold will occur. Instead of a vacuum, a high quality (99.998% pure) argon protective atmosphere may be used. The melting took place in an induction furnace using a carbon crucible with an inner ceramic lining.
  • the melt was cast into a carbon mould at 400°C, again in a medium vacuum.
  • the resulting ingot was then held at a temperature of about 800°C for 30 to 60 minutes for solutionising to take place. This was also done in a vacuum.
  • the soft alloy obtained after solutionising was then hardened by being held at a temperature of about 500 0 C for about 60 minutes. After hardening in this manner the ingot had a hardness of 180 HV 0.5.
  • the hardness of the ingot could be further increased by up to 300 HV 0.5 by cold-working. Reduction to quarter of the original thickness by rolling is tolerated between solutionising treatments.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
  • Dental Preparations (AREA)
  • Materials For Medical Uses (AREA)
EP86101121A 1985-01-29 1986-01-28 Goldlegierung Withdrawn EP0190648A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502914 DE3502914A1 (de) 1985-01-29 1985-01-29 Verwendung titanhaltiger goldlegierungen
DE3502914 1985-01-29

Publications (1)

Publication Number Publication Date
EP0190648A1 true EP0190648A1 (de) 1986-08-13

Family

ID=6261050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101121A Withdrawn EP0190648A1 (de) 1985-01-29 1986-01-28 Goldlegierung

Country Status (7)

Country Link
EP (1) EP0190648A1 (de)
JP (1) JPS61217542A (de)
DE (1) DE3502914A1 (de)
ES (1) ES8704551A1 (de)
GR (1) GR860237B (de)
PT (1) PT81919B (de)
ZA (1) ZA86637B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399721A1 (de) * 1989-05-26 1990-11-28 THE GENERAL ELECTRIC COMPANY, p.l.c. Elektrische Leiter und Verfahren zu ihrer Herstellung
DE4439793C1 (de) * 1994-11-08 1995-10-26 Degussa Verfahren zur Herstellung von Gußformstücken aus Gold-Titan-Legierungen
US5833462A (en) * 1995-02-25 1998-11-10 Degussa Aktiengesellschaft Precision attachments for dental technology capable of being cast on
US5853661A (en) * 1994-07-05 1998-12-29 Cendres Et Metaux Sa High gold content bio--compatible dental alloy
EP0685565B1 (de) * 1993-09-06 1999-03-24 Mitsubishi Materials Corporation Gold-ornament-material,gehaertet durch legieren mit minderen komponenten

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3709972A1 (de) * 1987-03-26 1988-10-06 Holzer Walter Gold-schmucklegierung
JPH02185933A (ja) * 1989-01-12 1990-07-20 Agency Of Ind Science & Technol 黒色化する金合金装飾品及びその処理法
JPH02225655A (ja) * 1989-02-28 1990-09-07 Agency Of Ind Science & Technol 光沢のある黒色に着色する金合金とその着色法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB876887A (en) * 1957-07-12 1961-09-06 Degussa Gold alloys, for use as material for electric resistances
DE2302837A1 (de) * 1973-01-20 1974-08-01 Th Wieland Scheideanstalt Dr Goldlegierung zum aufbrennen von porzellan fuer zahnaerztliche zwecke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB876887A (en) * 1957-07-12 1961-09-06 Degussa Gold alloys, for use as material for electric resistances
DE2302837A1 (de) * 1973-01-20 1974-08-01 Th Wieland Scheideanstalt Dr Goldlegierung zum aufbrennen von porzellan fuer zahnaerztliche zwecke

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 81, no. 8, 26th August 1974, page 205, no. 40552k, Columbus, Ohio, US; M. GRAHAM: "Precipitation hardening in gold-titanium alloys", & PROC. ELECTRON MICROSC. SOC. AMER. 1973, 31, 148-9 *
Dr.phil. M. HANSEN: "Constitution of binary alloys", 2nd edition, 1958, pages 237-239, McGraw-Hill Book Co., Inc., New York, US *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399721A1 (de) * 1989-05-26 1990-11-28 THE GENERAL ELECTRIC COMPANY, p.l.c. Elektrische Leiter und Verfahren zu ihrer Herstellung
US5073210A (en) * 1989-05-26 1991-12-17 The General Electric Company, P.L.C. Method of making electrical conductors
EP0685565B1 (de) * 1993-09-06 1999-03-24 Mitsubishi Materials Corporation Gold-ornament-material,gehaertet durch legieren mit minderen komponenten
US5853661A (en) * 1994-07-05 1998-12-29 Cendres Et Metaux Sa High gold content bio--compatible dental alloy
DE4439793C1 (de) * 1994-11-08 1995-10-26 Degussa Verfahren zur Herstellung von Gußformstücken aus Gold-Titan-Legierungen
EP0717118A2 (de) 1994-11-08 1996-06-19 Degussa Ag Verfahren zur Herstellung von Gussformstücken aus Gold-Titan-Legierungen
EP0717118A3 (de) * 1994-11-08 1997-01-29 Degussa Verfahren zur Herstellung von Gussformstücken aus Gold-Titan-Legierungen
DE4439793C2 (de) * 1994-11-08 2001-05-23 Degussa Verfahren zur Herstellung von Gußformstücken aus Gold-Titan-Legierungen
US5833462A (en) * 1995-02-25 1998-11-10 Degussa Aktiengesellschaft Precision attachments for dental technology capable of being cast on

Also Published As

Publication number Publication date
ES551292A0 (es) 1987-04-16
JPS61217542A (ja) 1986-09-27
PT81919B (en) 1987-11-12
PT81919A (en) 1986-02-01
DE3502914A1 (de) 1986-07-31
ZA86637B (en) 1986-09-24
GR860237B (en) 1986-05-30
ES8704551A1 (es) 1987-04-16

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Designated state(s): AT BE CH FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19861110

17Q First examination report despatched

Effective date: 19871130

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880412

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GAFNER, GEOFFREY