EP1447456A1 - Dotierte Goldlegierung - Google Patents

Dotierte Goldlegierung Download PDF

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Publication number
EP1447456A1
EP1447456A1 EP03405074A EP03405074A EP1447456A1 EP 1447456 A1 EP1447456 A1 EP 1447456A1 EP 03405074 A EP03405074 A EP 03405074A EP 03405074 A EP03405074 A EP 03405074A EP 1447456 A1 EP1447456 A1 EP 1447456A1
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EP
European Patent Office
Prior art keywords
alloy
gold
weight
expressed
ppm
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Withdrawn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
EP03405074A
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English (en)
French (fr)
Inventor
Denis Vincent
Nathalie Guilbaud
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.)
Metalor Technologies International SA
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Metalor Technologies International SA
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 Metalor Technologies International SA filed Critical Metalor Technologies International SA
Priority to EP03405074A priority Critical patent/EP1447456A1/de
Priority to DE602004014104T priority patent/DE602004014104D1/de
Priority to AT04709565T priority patent/ATE397101T1/de
Priority to PCT/CH2004/000076 priority patent/WO2004072310A2/fr
Priority to ES04709565T priority patent/ES2305723T3/es
Priority to EP04709565A priority patent/EP1594995B1/de
Priority to JP2006501446A priority patent/JP4879729B2/ja
Publication of EP1447456A1 publication Critical patent/EP1447456A1/de
Priority to US11/193,921 priority patent/US20060029513A1/en
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a gold alloy of at least 14 carats for the production of jewelry by lost wax casting.
  • Investment casting is a method that allows you to produce complex parts with a beautiful appearance of surface and excellent dimensional accuracy.
  • This technique consists first of all to make in wax, by injection into tools, the replica of each of the desired pieces.
  • the assembly of these models on pouring channels also in wax constitutes a cluster; after having uniformly surrounded this cluster with a ceramic shell, we make melt the wax, which leaves its exact imprint in the ceramic, in which we pour the molten metal. After cooling the shell is destroyed and the metal parts are separated and finished.
  • This technique for melting gold jewelry dates back to the early days of metallurgy, that is to say approximately 4000 years before J.C. It is not before its application in dental technology in the early twentieth century that have been developed mold production and casting techniques such as we know them today.
  • Silicon is known to cause the formation of a layer stable protective oxide around the parts obtained by casting when it is added to 14 carat gold alloys in small quantities.
  • the formation of this oxide layer avoids porosities due to reactions between the liquid metal and coating, and obtain a perfect surface for 9, 14 and 18 carat gold alloys.
  • the addition of silicon leads to a increased grain size and decreased resistance to break. These side effects are catastrophic in the case of 18 carat gold alloys, resulting in hot fragility of the alloy, an enormous grain size due to an inhibition of the refiners of grains, and inhibition of grain refiners.
  • the object or problem of the invention is to find elements of doping of a gold alloy of at least 14 carats with the advantages of silicon without having the disadvantages mentioned above.
  • the doping elements are Zn, Ga, Ta, Pt and Ru. Surprisingly the presence of these elements makes it possible to avoid, during of the lost wax casting of gold alloys, the harmful interaction between mold and liquid metal, apparently through the formation of a layer protective gas-impermeable oxide. Ruthenium is a refiner of very effective grains, even at low content.
  • the invention relates to a gold alloy of at least 14 carats, characterized in that it contains as doping elements, by weight, from 10 to 20,000, preferably from 100 to 1000, ppm Zn, from 10 to 20,000, preferably from 100 to 1000, ppm Ga, from 10 to 20,000, preferably from 100 to 1000, ppm Ta, from 10 to 10,000, preferably from 90 to 950, ppm Pt and from 10 to 5000, from preferably from 5 to 100, ppm Ru.
  • the gold alloy of at least 14 carats can be a gold-based alloy, silver and copper, in particular a 14-carat alloy such as for example an alloy of 14 yellow gold comprising, expressed by weight, 58-59% Au, 24-28 % Ag and 13-17% Cu or a red gold alloy comprising, expressed by weight, 58-59% Au, 7-11% Ag and 30-34% Cu, an 18-carat alloy such as by example a yellow gold alloy comprising, expressed by weight, 75-76% Au, 10-14% Ag and 10-14% Cu, a pale yellow gold alloy comprising, expressed by weight, 75-76% Au, 14-18% Ag and 7-11% Cu, a rose gold alloy comprising, expressed by weight, 75-76% Au, 7-11% Ag and 14-18% Cu, a red gold alloy comprising, expressed by weight, 75-76% Au, 2-6% Ag and 18-22% Cu, a 22 carat alloy such as for example a gold alloy yellow comprising, expressed by weight, 91-92% Au, 3-7% Ag and 1-5% Cu, or a red gold alloy
  • the gold alloy of at least 14 carats can also be a fine gold alloy, in particular comprising, expressed by weight, 99-99.9% Au and 0-1% Cu.
  • it will suitably contain from 10 to 10,000 ppm Zn, from 10 to 10 000 ppm Ga, from 10 to 10 000 ppm Ta, from 10 to 10 000 ppm Pt and from 10 to 5000 ppm Ru.
  • the gold alloy of at least 14 carats can also be a gray gold alloy, for example example an 18-carat white gold alloy comprising, expressed by weight, 75-76 % Au, 8-12% Cu, 0-4% In, and 11-15% Pd, or a 14 carat white gold alloy comprising, expressed by weight, 58-59% Au, 14-18% Ag, 12-16% Pd, and 6-10% Cu.
  • a gray gold alloy for example example an 18-carat white gold alloy comprising, expressed by weight, 75-76 % Au, 8-12% Cu, 0-4% In, and 11-15% Pd, or a 14 carat white gold alloy comprising, expressed by weight, 58-59% Au, 14-18% Ag, 12-16% Pd, and 6-10% Cu.
  • the gold alloy according to the invention is generally produced in ingots by pouring under an inert atmosphere, for example nitrogen, elements constitutive of the alloy, either in the pure state or in the alloy state, in ingot molds made of heat-resistant material such as for example graphite.
  • the alloy can then be shaped by continuous casting to to obtain plots.
  • Continuous casting is a process where the molten alloy is fed into an open-ended graphite mold, in which the metal solidifies to produce a bar of predefined dimensions.
  • the solidified form is cooled and removed from the water-cooled mold at a speed controlled using rollers, and the material is sawn to the desired length.
  • the studs directly usable in casting are then obtained by cutting and marking in the bar after continuous casting.
  • the invention also relates to a method for manufacturing a gold alloy as defined above which involves the casting under an inert atmosphere of constituent elements of the alloy, either in the pure state or in the alloy state.
  • Preparation of objects cast by the wax casting technique lost is usually done as follows.
  • the ingots are rolled and cut into small pieces, or if the alloy has been shaped by continuous casting, the casting studs are used as is.
  • the coating used consists of gypsum and silica.
  • the dewaxing is carried out without steam at a temperature of 140 to 160 ° C, then the cooking cycle is as follows: plateau at 200 ° C, rise by 5 ° C per minute, plateau at 650 ° C by 45 minutes.
  • the casting is then carried out by centrifugation, after melting in a graphite crucible, under nitrogen.
  • the parts are then removed from the mold and billed in order to eliminate surface oxide. Correct and complete: generalize the preparation of the actually used cast objects.
  • the invention also relates to the use of the alloy defined above for the production of jewelry by lost wax casting.
  • the invention also relates to a cast object comprising this alloy.
  • the temperature is the temperature ambient or is expressed in degrees Celsius
  • the pressure is the pressure atmospheric.
  • Figures 1 and 2 respectively represent the diagram of a steering wheel to assess the surface condition, flowability, ductility, porosity, the oxidation as well as the grain size of the alloy after casting, and a photograph of a harp-shaped piece to assess the heat resistance of the alloy.
  • Tables 1 and 2 respectively bring together the compositions of the standard and doped alloys, and the main characteristics of the parts castings obtained from these alloys.
  • ingots of alloys of dimensions 80 x 50 x 5 mm 3 were cast under nitrogen in graphite ingots, from shot for gold and silver, copper plates, thin pieces of zinc and gallium, and 5% gold-tantalum and 5% platinum-ruthenium pre-alloys in thin strips.
  • the ingots were then rolled to 1 mm thick.
  • a 2 cm square plate for each alloy was used (after coating and polishing) for spectrometric color analyzes.
  • the laminated sheets were then cut into pieces about 1 cm per side.
  • the coating used consists of gypsum and silica.
  • the dewaxing is carried out without steam at 150 ° C, then the cooking cycle is as follows: level at 200 ° C, rise 5 ° C per minute, plateau at 650 ° C for 45 minutes.
  • the casting is then done by centrifugation, after melting in a graphite crucible, under nitrogen.
  • the pieces are then unmolded and milled to remove surface oxide, then analyzed according to the procedures below.
  • Table 1 specifies the composition of the cast objects for four 18 carat gold alloys according to the invention, called here “doped yellow”, “Pale yellow doped”, “pink doped” and “red doped”, and corresponding respectively to “standard yellow”, “standard pale yellow” alloys, “Standard pink” and “standard red” obtained in Example 2.
  • Table 1 specifies the composition of the cast objects for four prior art 18 carat gold alloys called “yellow standard “,” pale yellow standard “,” standard pink “and” red standard ”, and a known silicon doped alloy with a composition close to standard yellow, called “yellow-Si”.
  • the color of the alloys was measured on a 2 cm square plate side and 1 mm thick according to the 3-dimensional measuring system called CIELab, CIE being the sign of the International Commission for Lighting, and Lab the three coordinate axes.
  • CIELab CIE being the sign of the International Commission for Lighting
  • Lab the three coordinate axes.
  • the human eye can distinguish a difference of 1 point on this scale.
  • the properties of the alloys after casting with lost wax were evaluated for each alloy using two castings.
  • the first part (Figure 1) consists of a steering wheel on which are placed a plate of 1 cm 2 of surface and 1 mm thick as well as rods of 2 cm in height and diameters 0.8, 0.6, 0.4 and 0.3 mm. On the steering wheel are placed 2 rods of each diameter, i.e. 8 rods.
  • This first part makes it possible to evaluate the surface condition, the flowability, the bending, the ductility, the porosity, the oxidation as well as the grain size of the alloy after casting.
  • the second part is in the shape of a harp ( Figure 2) and allows the hot resistance of the alloy to be evaluated.
  • the grade given to the surface finish is calculated according to the criteria following: porosity and fine texture of the wafer. Note 10 corresponds to a perfect surface condition without defects.
  • the small raised points on the surface are due to coating surface defects and are independent of the alloy, however, they affect the quality of the part.
  • a perfect surface of the porosity and fineness of texture but with spikes in relief will score 9.5 or 9 depending on the size or frequency of these points in order to distinguish it from a perfect surface and without raised points.
  • the note minimum In order for the alloy to be accepted from the point of view of its surface, the note minimum must be 9/10, and only defects due to the quality of the coating will be tolerated (points in relief).
  • Table 1 shows that the doped alloys according to the invention have a satisfactory surface condition, improved compared to alloys corresponding standards (10/7, 9/7, 9.5 / 7, 9/6) and identical to the doped alloy silicon (10/10).
  • the different alloys were subjected to a flowability test which makes it possible to determine the ease of an alloy to flow in conduits small diameters. This property is important for the manufacture of pieces of jewelry with fine parts which must be reproduced during casting.
  • the score given is based on the average over the heights of the 8 precious alloy rods after casting. The higher the score out of 20 is the better the castability of the alloy.
  • the doped alloys according to the invention have better flowability than the corresponding standard alloys (14.12 / 9.40, 14.50 / 9.25, 16.90 / 9.40, 18.5 / 12.6) and the alloy doped with silicon (14.12 / 9.0).
  • the bending test is used to simulate the crimping step at the jeweler. It is important that the crimp rods can be bent several times in order to allow the jeweler several tests without the whole piece must be rolled up.
  • the bent rods have a diameter of 0.8 mm in this trial.
  • the bend test consists of a first 90 ° angle twist and the following are alternately opposed at 180 ° angle. A value of 1 corresponds to a 90 ° angle break, a value of 2 corresponds to a 90 ° break + 180 ° angle. Higher values correspond to a additional twist reverse to the previous one and 180 ° angle.
  • Table 1 shows that the objects cast in alloys doped according to the invention have better bending than those in standard alloys corresponding (4/3, 4.5 / 3.5, 3/2, 2/1) or in a silicon doped alloy (4/2).
  • the so-called ring enlargement test showed that the doped alloys according to the invention are more ductile than the corresponding standard alloys and can withstand up to 24% elongation before rupture.
  • the cast rings had a diameter of 15.9 mm (number 10) and a section of 2 mm 2 .
  • the standard alloy without refiner supports an enlargement of 2 numbers, and the doped alloy supports an enlargement of 1
  • the hot break resistance test is carried out by pouring a harp-shaped piece (Figure 2), The difference in expansion coefficient of the mold and of the metal of generates a tension capable of causing the rupture of the metal according to its fragility. This test allows to discriminate fragile structures as well as possible harmful pollution of the metal. The score is assigned subtracting from 20, 1 point per broken rod. Only alloys having obtained the note 20/20 have been retained.
  • Table 1 shows that the doped alloys according to the invention have a excellent resistance to hot rupture, unlike the alloy doped with silicon.
  • the minimum acceptable score is 9/10.
  • the exhibits with surface porosity are automatically rejected. Less the alloy present porosity, the better its mechanical properties and the easier it will be polishing.
  • Table 1 shows that the doped alloy according to the invention has a state of porosity identical to that of the silicon doped alloy (10/10) and well better than each of the standard alloys (10/8, 10/6, 9/0 and 9/7).
  • the oxidation state is noted according to the appearance of the correct part after demolding. The more the room will have a uniform appearance close to the color of the alloy without black marks due to copper oxide, plus the note obtained will tend towards 10/10. Copper oxide should be avoided in the area of the possible because it does not protect the part from gases and it is suspected of promoting mold degradation reactions leading to release of sulfur dioxide gas.
  • the parts from the doped alloys according to the invention have a uniform surface close to the color of the alloy without traces of oxide of copper and therefore have an excellent oxidation state, much better than that of parts from standard alloys (Table 1: 10/0, 10/0, 10/5, 10/10).
  • ASTM grain size is given by the superposition of a ASTM grid on the photo of a metallographic grid of a casting after chemical attack to reveal grain boundaries.
  • a size of 7 corresponds to an average grain diameter of 32 microns.
  • ASTM 3 corresponds to an average diameter of 125 microns. The higher the ASTM value, the smaller the grains, the better the mechanical properties of the alloy and the easier the polishing.
  • Table 1 shows that the parts from alloys doped according to the invention therefore have a grain size identical to or finer than that of parts from standard alloys (7/7, 7/7, 6 / 3-4, 6/6) or from the doped alloy silicon (7 / 2-3).

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Adornments (AREA)
  • Catalysts (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Glass Compositions (AREA)
  • Chemically Coating (AREA)
EP03405074A 2003-02-11 2003-02-11 Dotierte Goldlegierung Withdrawn EP1447456A1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP03405074A EP1447456A1 (de) 2003-02-11 2003-02-11 Dotierte Goldlegierung
DE602004014104T DE602004014104D1 (de) 2003-02-11 2004-02-10 Dopierte gold-legierung
AT04709565T ATE397101T1 (de) 2003-02-11 2004-02-10 Dopierte gold-legierung
PCT/CH2004/000076 WO2004072310A2 (fr) 2003-02-11 2004-02-10 Alliage d'or
ES04709565T ES2305723T3 (es) 2003-02-11 2004-02-10 Aleacion de oro dopado.
EP04709565A EP1594995B1 (de) 2003-02-11 2004-02-10 Dopierte gold-legierung
JP2006501446A JP4879729B2 (ja) 2003-02-11 2004-02-10 金合金
US11/193,921 US20060029513A1 (en) 2003-02-11 2005-07-29 Doped gold alloy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03405074A EP1447456A1 (de) 2003-02-11 2003-02-11 Dotierte Goldlegierung

Publications (1)

Publication Number Publication Date
EP1447456A1 true EP1447456A1 (de) 2004-08-18

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EP03405074A Withdrawn EP1447456A1 (de) 2003-02-11 2003-02-11 Dotierte Goldlegierung
EP04709565A Expired - Lifetime EP1594995B1 (de) 2003-02-11 2004-02-10 Dopierte gold-legierung

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EP04709565A Expired - Lifetime EP1594995B1 (de) 2003-02-11 2004-02-10 Dopierte gold-legierung

Country Status (7)

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US (1) US20060029513A1 (de)
EP (2) EP1447456A1 (de)
JP (1) JP4879729B2 (de)
AT (1) ATE397101T1 (de)
DE (1) DE602004014104D1 (de)
ES (1) ES2305723T3 (de)
WO (1) WO2004072310A2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2450460A1 (de) * 2009-05-06 2012-05-09 Rolex S.A. Weißgoldlegierung ohne Nickel und Kupfer
RU2588733C1 (ru) * 2015-04-22 2016-07-10 Юлия Алексеевна Щепочкина Ювелирный сплав
ITUB20153998A1 (it) * 2015-09-29 2017-03-29 Progold S P A Madreleghe per la realizzazione di leghe di oro a titolo 14 carati di colore rosso russia

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5078271B2 (ja) * 2006-03-30 2012-11-21 テルモ株式会社 生体器官拡張用ステントおよびその製造方法
JP5264345B2 (ja) * 2008-07-28 2013-08-14 石福金属興業株式会社 ホワイトゴールド合金
JP2016536470A (ja) * 2013-09-10 2016-11-24 アップル インコーポレイテッド 向上した硬度を有する結晶性金合金
KR102066601B1 (ko) * 2018-04-10 2020-01-15 서울시립대학교 산학협력단 Cd free 18K 레드골드용 땜소재
KR102511671B1 (ko) * 2022-09-05 2023-03-17 김승일 핑크골드 색상이 구현되는 땜 용접 조성물 및 이를 이용한 귀금속 땜 용접방법

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3132143A1 (de) * 1981-08-14 1983-03-03 Degussa Ag, 6000 Frankfurt Edelmetallegierung zur herstellung von keramischen massen verblendbaren kronen und bruecken
EP0475528A2 (de) * 1990-09-10 1992-03-18 Elephant Edelmetaal B.V. Zahnporzellan, Verfahren zur Herstellung einer Zahnrestauration und Dentallegierung
US5221207A (en) * 1990-10-03 1993-06-22 Degussa Aktiengesellschaft Yellow dental alloy with a high gold content
GB2279662A (en) * 1993-07-10 1995-01-11 Cookson Precious Metals Limite Gold alloy
US5853661A (en) * 1994-07-05 1998-12-29 Cendres Et Metaux Sa High gold content bio--compatible dental alloy
DE19958800A1 (de) * 1999-06-30 2001-01-04 Wieland Edelmetalle Weißgold-Schmucklegierung
DE10008744A1 (de) * 2000-02-24 2001-08-30 Wieland Edelmetalle Weißgold-Schmucklegierung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH108235A (ja) * 1996-06-21 1998-01-13 Sumitomo Metal Mining Co Ltd 合金への黒色酸化物層形成方法及びこれにより得られた黒色合金
US6325839B1 (en) * 1999-07-23 2001-12-04 Jeneric/Pentron, Inc. Method for manufacturing dental restorations
ES2239085T3 (es) * 2000-09-29 2005-09-16 CENDRES & METAUX SA Aleacion dental con alto contenido de oro apta para aplicar mediante coccion.
DE60141941D1 (de) * 2001-01-26 2010-06-10 Metalor Technologies Int Graue Goldlegierung
JP2002256360A (ja) * 2001-03-01 2002-09-11 Ijima Kingin Kogyo Kk 白色金合金
JP2005298832A (ja) * 2002-02-08 2005-10-27 Matsuda Sangyo Co Ltd カラー金合金

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3132143A1 (de) * 1981-08-14 1983-03-03 Degussa Ag, 6000 Frankfurt Edelmetallegierung zur herstellung von keramischen massen verblendbaren kronen und bruecken
EP0475528A2 (de) * 1990-09-10 1992-03-18 Elephant Edelmetaal B.V. Zahnporzellan, Verfahren zur Herstellung einer Zahnrestauration und Dentallegierung
US5221207A (en) * 1990-10-03 1993-06-22 Degussa Aktiengesellschaft Yellow dental alloy with a high gold content
GB2279662A (en) * 1993-07-10 1995-01-11 Cookson Precious Metals Limite Gold alloy
US5853661A (en) * 1994-07-05 1998-12-29 Cendres Et Metaux Sa High gold content bio--compatible dental alloy
DE19958800A1 (de) * 1999-06-30 2001-01-04 Wieland Edelmetalle Weißgold-Schmucklegierung
DE10008744A1 (de) * 2000-02-24 2001-08-30 Wieland Edelmetalle Weißgold-Schmucklegierung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2450460A1 (de) * 2009-05-06 2012-05-09 Rolex S.A. Weißgoldlegierung ohne Nickel und Kupfer
RU2588733C1 (ru) * 2015-04-22 2016-07-10 Юлия Алексеевна Щепочкина Ювелирный сплав
ITUB20153998A1 (it) * 2015-09-29 2017-03-29 Progold S P A Madreleghe per la realizzazione di leghe di oro a titolo 14 carati di colore rosso russia

Also Published As

Publication number Publication date
ES2305723T3 (es) 2008-11-01
EP1594995B1 (de) 2008-05-28
WO2004072310A3 (fr) 2004-10-14
EP1594995A2 (de) 2005-11-16
WO2004072310A2 (fr) 2004-08-26
JP4879729B2 (ja) 2012-02-22
US20060029513A1 (en) 2006-02-09
JP2006519922A (ja) 2006-08-31
DE602004014104D1 (de) 2008-07-10
ATE397101T1 (de) 2008-06-15

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