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
  • C22C5/04—Alloys based on a platinum group metal
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/02—Making non-ferrous alloys by melting
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
• • G—PHYSICS
  • G04—HOROLOGY
  • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
  • G04B19/00—Indicating the time by visual means
  • G04B19/04—Hands; Discs with a single mark or the like
  • G04B19/042—Construction and manufacture of the hands; arrangements for increasing reading accuracy
• • G—PHYSICS
  • G04—HOROLOGY
  • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
  • G04B19/00—Indicating the time by visual means
  • G04B19/06—Dials
  • G04B19/12—Selection of materials for dials or graduations markings
• • G—PHYSICS
  • G04—HOROLOGY
  • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
  • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
  • G04B3/04—Rigidly-mounted keys, knobs or crowns
  • G04B3/048—Operation exclusively by axial movement of a push-button, e.g. for chronographs
• • G—PHYSICS
  • G04—HOROLOGY
  • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
  • G04B37/00—Cases
  • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
• • G—PHYSICS
  • G04—HOROLOGY
  • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
  • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
  • G04D3/0074—Watchmakers' or watch-repairers' machines or tools for working materials for treatment of the material, e.g. surface treatment
  • G04D3/0092—Watchmakers' or watch-repairers' machines or tools for working materials for treatment of the material, e.g. surface treatment for components of the time-indicating mechanism, e.g. dials

Definitions

• the present invention relates to a platinum alloy.
• the invention also relates to an article, in particular to a decorative article, and more specifically to a watch component, made of this alloy.
• the addition elements will therefore respond to a technical constraint specific to the element.
• the first classical addition elements are ruthenium, cobalt, copper, iridium.
• Platinum-ruthenium alloys have a universal use for jewelry and watchmaking, especially for machined products.
• the platinum ruthenium alloy has the characteristic of being the whitest platinum alloy on the market. Unfortunately, this alloy is difficult to cast due to its high casting temperature and relatively low melting range. In addition, this alloy does not easily lend itself to traditional machining techniques such as bar turning, milling and drilling.
• the object of the present invention is to overcome the aforementioned drawbacks by proposing a novel platinum alloy which is dazzlingly white, easy to cast while having good machinability.
• the present invention relates to a platinum alloy consisting by weight of 95.00 to 96.00% Pt, 1.00 to 4.95% Ru, 0.05 to 2.00% Ge, from 0 to 2.00% Au and any impurities with a total content less than or equal to 0.50%.
• the Ru content is between 2.00 and 4.95% by weight. More preferably, it is between 3.00 and 4.95% by weight. Particularly preferably, the Ru content is between 3.50 and 4.80% by weight.
• the Ge content is between 0.05 and 1.50% by weight. More preferably, it is between 0.05 and 1.00% by weight. Particularly preferably, the Ge content is between 0.07 and 0.70% by weight.
• the Au content is between 0.05 and 1.50% by weight. More preferably, the Au content is between 0.10 and 1.00% by weight. Particularly preferably, the Au content is between 0.10 and 0.70% by weight.
• the ruthenium brings some hardening and whiteness to the alloy.
• the addition of germanium significantly increases the hardness of the alloy.
• the addition of germanium increases the machinability of the alloy and allows the melting range to be increased while reducing the casting temperature.
• the addition of gold has this same beneficial effect on machinability and castability.
• the alloy according to the invention has a yellowness index Yi10° of between 7 and 8 and a hardness HV2 of between 140 and 230.
• the alloy according to the invention has a single-phase structure of the face-centered cubic type, free from precipitation of intermetallics such as GePt3, GePt2, Ge2Pt3, GePt, Ge3Pt2, GeRu, which would reduce hardening by solid solution and could generate defects during the polishing steps (presence of hard spots).
• composition of this alloy therefore makes it possible to reach an excellent compromise between hardness, machinability and flowability, without having a negative impact on the white color of the alloy.
• the present invention also relates to an article and in particular a watch component made of this alloy.
• the alloy of the present invention is a platinum alloy at 95% by weight.
• the platinum alloy consists by weight of 95.00 to 96.00% Pt, 1.00 to 4.95% Ru, 0.05 to 2.00% Ge, 0 to 2.00% Au and impurities possible with a total content ⁇ 0.50%.
• the alloy is made up of these different elements and impurities, ie. that the total of Pt, Ru, Ge, Au and any impurities reaches the percentage of 100%.
• the Ru content is between 2.00 and 4.95% by weight. More preferably, it is between 3.00 and 4.95% by weight. Particularly preferably, the Ru content is between 3.50 and 4.80% by weight.
• the Ge content is between 0.05 and 1.50% by weight. More preferably, it is between 0.05 and 1.00% by weight. Particularly preferably, the Ge content is between 0.07 and 0.70% by weight.
• the Au content is between 0.05 and 1.50% by weight. More preferably, the Au content is between 0.10 and 1.00% by weight. Particularly preferably, the Au content is between 0.10 and 0.70% by weight.
• the platinum alloy consists, by weight, of 95.00 to 96.00% of Pt, of 2.00 to 4.90% of Ru, of 0.05 to 1.50% of Ge, of 0.05 to 1.50% of Au and any impurities with a total content ⁇ 0.50%.
• the platinum alloy consists, by weight, of 95.00 to 96.00% of Pt, of 3.00 to 4.85% of Ru, 0.05 and 1.00% of Ge, of 0.10 to 1.00% of Au and any impurities with a total content ⁇ 0.50%.
• the platinum alloy consists, by weight, of 95.00 to 96.00% of Pt, of 3.50 to 4.83% of Ru, 0.07 and 0.70% of Ge, of 0.10 to 0.70% of Au and any impurities with a total content ⁇ 0.50%.
• the platinum alloys according to the invention find a particular application for the production of a watch component and more specifically of a watch component for dressing such as a middle part, a back, a bezel, a pusher, a crown, a bracelet, a bracelet clasp, a dial, a hand and a dial index.
• this alloy can be used for any article and more specifically any decorative article, for example, in the field of jewelry or jewelry.
• the alloy according to the invention has a hardness HV2 of between 140 and 230, and optionally between 150 and 210 and a yellowness index Yi10° as defined below of between 7 and 8.
• the alloy according to the invention has a single-phase structure of face-centered cubic type, free from precipitation of intermetallics such as GePt3, GePt2, Ge2Pt3, GePt, Ge3Pt2, GeRu.
• Comparative Example No. 1 is devoid of germanium and comprises gold and ruthenium. Samples No. 2 to No. 11 contain gold and germanium while samples No. 12 and No. 13 do not contain gold. The measurements were carried out on annealed and polished samples.
• L*a*b* colorimetric values in CIELAB colorimetric space were measured with a KONICA MINOLTA CM-2600d spectrophotometer with D65 illuminant and 10° viewing angle.
• the Yellowness index Yi10° which is an indicator of the whiteness of the alloy, was calculated on the basis of the L*a*b* values according to the ASTM E313 standard. The lower this index, the whiter the alloy.
• a significant and almost linear increase in hardness is observed with the addition of germanium in alloys No. 2 to No. 13 while maintaining a similar yellowness index which is included in the interval 7 to 8.
• the alloys according to the invention have a hardness of between 150 and 196 HV2 compared to 138 HV2 for the reference alloy No. 1 without germanium.
• the addition of a low germanium content with a content of 0.1% by weight in alloys No. 5 and 7 already has a significant effect with a hardness value reaching 150 HV2. With an addition of 0.5% by weight of germanium, the hardness rises to 196 HV2. It is observed that the addition of germanium has a significant effect on the hardness whether or not the alloy contains gold.

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• 2021
  • 2021-12-14 EP EP21214514.8A patent/EP4198157A1/fr active Pending
• 2022
  • 2022-10-28 US US17/975,827 patent/US11702722B2/en active Active
  • 2022-10-28 JP JP2022173243A patent/JP7429757B2/ja active Active
  • 2022-11-28 CN CN202211502878.6A patent/CN116262953A/zh active Pending

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