US3529959A - Gold-base alloy - Google Patents

Gold-base alloy Download PDF

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Publication number
US3529959A
US3529959A US565276A US3529959DA US3529959A US 3529959 A US3529959 A US 3529959A US 565276 A US565276 A US 565276A US 3529959D A US3529959D A US 3529959DA US 3529959 A US3529959 A US 3529959A
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US
United States
Prior art keywords
alloy
gold
platinum
iridium
base alloy
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Expired - Lifetime
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US565276A
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English (en)
Inventor
Alan S Darling
Gordon L Selman
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Johnson Matthey PLC
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Johnson Matthey PLC
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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
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/08—Bushings, e.g. construction, bushing reinforcement means; Spinnerettes; Nozzles; Nozzle plates
    • C03B37/095—Use of materials therefor

Definitions

  • This invention relates to an improved alloy, more particularly, but not necessarily exclusively, intended for use in the manufacture of spinnerettes.
  • An alloy material suitable for use in the manufacture of spinnerettes should, as is well-known, desirably possess the following characteristics, namely: (l) uniformity 0f structures and behaviour, (2) small grain size, (3) resistance to attack by acids and alkalis and to abrasion. At the same time, the alloy should be capable of being subjected to a hardening treatment without dimensional changes taking place in the material treated.
  • spinnerettes have been made from a binary gold-platinum alloy, such, for example as a 70% Au and 30% Pt alloy.
  • a binary gold-platinum alloy such as a 70% Au and 30% Pt alloy.
  • Such an alloy is mechanically strong and highly resistant to corrosion but has not proved entirely satisfactory for the purpose due to the fact that a tendency for the alloy to exhibit gross inverse segregation during casting renders it diiicult to Obtain a sufficiently uniform composition.
  • considerable grain growth is liable to occur when the ⁇ alloy is annealed.
  • the ternary gold-platinum-rhodium alloy is open to criticism as a material for spinnerette manufacture on the ground that spinnerettes made from such an alloy are liable in use to serious corrosion, which has been attributed to the presence of massive particles of a hard second phase. It has been found, for example, that the presence of two contiguous zones of different phases may result in electrolytic corrosion particularly in the region of the outlet edges of the spinnerette holes, which could weaken the metal at these edges and cause parts thereof to be broken away.
  • this massive second phase is a hard platinum-rich phase in equilibrium with a gold-rich matrix, this platinum-rich phase apparently containing all the rhodium constituent of the alloy.
  • An object of this invention therefore is to improve the properties of gold-base platinum-containing alloys.
  • Another object of the invention is to provide a goldbase platinum-containing alloy which offers greatly superior properties compared with known binary gpldplatinum alloys.
  • a further object of the invention is to provide an improved alloy for use in the manufacture of spinnerettes.
  • the invention contemplates the provision of a gold-base alloy which contains from 50% to 80% by weight of gold, 0.04% to 0.5% by weight of iridium and balance platinum apart from impurities.
  • an alloy composed of 70 wt. percent gold, 29.8 wt. percent platinum and 0.2 wt. percent iridium is a particularly suitable alloy for use inthe manufacture of spinnerettes.
  • the requisite proportions of the constituents of the alloy may be induction melted in an alumina crucible under argon and cast into a copper mould to yield a sheet ingot.
  • This ingot is then homogenised for about 16 hours at a temperature of about 1000 C., followed by a period of about 48 hours at a temperature of about ll00 C.
  • the alloy is then furnace cooled to 850 C. and water quenched, after which the alloy becomes ductile and can be cold rolled to sheet which is given a final anneal for a period of about 1/2 hour at a temperature of 1150 C., and water quenched.
  • Ternary gold-platinum-iridium alloys made in accordance with the invention may be age-hardened similarly to the known gold-platinum-rhodium alloy.
  • the improved alloy of the invention will be found to possess, to a greater degree than alloys hitherto available, the requirements of a satisfactory spinnerette alloy.
  • the improved alloy has a uniform structure, any second' phase present being nely and evenly distributed through the goldplatinum matrix.
  • the presence of iridium ensures an effective degree of grain refinement and the substantial absence of the aforesaid second phase will give a spinnerette made from this alloy a considerably longer life than has hitherto been attainable, and the corrosive action, above referred to, will not take place.
  • FIG. 1 illustrates a transverse section (X150) of an alloy containing 70% gold and 30% platinum in which the relatively coarse grain structure will be noted.
  • FIG. 2 illustrates a transverse section (X150) of an alloy containing 70% gold, 29.5% platinum and 0.5% rhodium
  • FIG. 3 illustrates a transverse section (X150) of an alloy containing 70% gold, 29.81% platinum and 0.2% iridium from which it will be noted that the iridium addi- 3 tive produces a significant grain refinement without showing any large quantities of a platinum rich phase.
  • the grain refinement is clearly shown by a comparison of FIG. 4 (70% gold, 29.5% platinum and ⁇ 0.5% rhodium) with FIG. 5 (70% gold, 29.8% platinum and 0.2% iridum), FIGS. 4 and 5 being comparable longitudinal sections. All the percentages given herein are by weight.
  • a gold-base alloy consisting essentially of from 50% to 80% by Weight of gold, from 0.04% to 0.5% by weight of iridium, and the balance platinum.
  • a gold-base alloy consisting essentially of 70% by weight of gold, 29.8% by weight of platinum, and 0.2% by weight of iridium.
  • a method of making a gold-base alloy which comprises melting 50% to 80% by weight of gold, 0.04% to 0.5 by weight of iridium and the balance platinum in an alumina crucible under argon, casting the alloy thereby formed into a copper mold to yield a sheet ingot, homogenizing said ingot by heat treatment for a first period of about 16 hours at about 1000 C. followed by a second period of about 48 hours at about 1100 C., furnace cooling the heated alloy to about 850 C., water quenching said cooled alloy whereby the alloy becomes ductile and then cold-rolling said alloy into sheet.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Contacts (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US565276A 1965-07-23 1966-07-14 Gold-base alloy Expired - Lifetime US3529959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB31556/65A GB1112766A (en) 1965-07-23 1965-07-23 An improved alloy

Publications (1)

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US3529959A true US3529959A (en) 1970-09-22

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US565276A Expired - Lifetime US3529959A (en) 1965-07-23 1966-07-14 Gold-base alloy

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US (1) US3529959A (enrdf_load_stackoverflow)
BE (1) BE684532A (enrdf_load_stackoverflow)
DE (1) DE1533290A1 (enrdf_load_stackoverflow)
GB (1) GB1112766A (enrdf_load_stackoverflow)
NL (1) NL6610352A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10883162B2 (en) * 2013-12-20 2021-01-05 Tanaka Kikinzoku Kogyo K.K. Alloy for medical use, and method for producing same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9201956A (nl) * 1992-11-09 1994-06-01 Elephant Edelmetaal Bv Vervaardiging van een spinkop of ander voortbrengsel uit een goud-platina-palladium-rhodium legering; de legering; daaruit vervaardigd voortbrengsel; productie van kunstvezels.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1680598A (en) * 1925-08-05 1928-08-14 Dreaper William Porter Alloy and its uses
US2143217A (en) * 1937-02-22 1939-01-10 Degussa Process for reducing the grain in precious metals and their respective alloys
DE691061C (de) * 1935-07-24 1940-05-15 Heraeus Gmbh W C nduesen
US2216495A (en) * 1938-02-02 1940-10-01 Chemical Marketing Company Inc Manufacture of gold alloys
CH221272A (de) * 1939-06-10 1942-05-31 Siebert Ges Mit Beschraenkter Spinndüse aus einer Platin-Gold-Legierung.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1680598A (en) * 1925-08-05 1928-08-14 Dreaper William Porter Alloy and its uses
DE691061C (de) * 1935-07-24 1940-05-15 Heraeus Gmbh W C nduesen
US2143217A (en) * 1937-02-22 1939-01-10 Degussa Process for reducing the grain in precious metals and their respective alloys
US2216495A (en) * 1938-02-02 1940-10-01 Chemical Marketing Company Inc Manufacture of gold alloys
CH221272A (de) * 1939-06-10 1942-05-31 Siebert Ges Mit Beschraenkter Spinndüse aus einer Platin-Gold-Legierung.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10883162B2 (en) * 2013-12-20 2021-01-05 Tanaka Kikinzoku Kogyo K.K. Alloy for medical use, and method for producing same

Also Published As

Publication number Publication date
BE684532A (enrdf_load_stackoverflow) 1967-01-03
DE1533290A1 (de) 1969-12-18
NL6610352A (enrdf_load_stackoverflow) 1967-01-24
GB1112766A (en) 1968-05-08

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