EP3478864A1 - Massivglasbildende weissgoldlegierung - Google Patents
Massivglasbildende weissgoldlegierungInfo
- Publication number
- EP3478864A1 EP3478864A1 EP17739868.2A EP17739868A EP3478864A1 EP 3478864 A1 EP3478864 A1 EP 3478864A1 EP 17739868 A EP17739868 A EP 17739868A EP 3478864 A1 EP3478864 A1 EP 3478864A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gold alloy
- white gold
- elements
- alloy according
- alloys
- 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- Withdrawn
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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
Definitions
- the invention relates to a white gold alloy, which can form solid glasses in many areas.
- Metallic solid glasses are alloys that solidify at sufficiently high cooling rates to form amorphous solids. Due to their amorphous structure, metallic solid glasses have properties that make them far superior to conventional metal alloys.
- the lack of a volume jump by crystallization of the sample can be made of solid glass forming alloys near net shape castings, which require a minimum of post-processing. Near-eutectic alloys exhibit excellent casting properties due to their low liquidus temperature. Furthermore, amorphous semi-finished products (eg, granules) can be removed from the glass into the
- Metallic solid glasses can also have much higher hardness than crystalline alloys.
- composition of metallic solid glass can not be changed arbitrarily, since a glass formation is usually possible only in very limited concentration ranges.
- hard gold alloys are very desirable for the production of jewelry.
- Crystalline gold alloys also reach at tremendous amounts of materials.
- a, b, c are at% (atomic percent), x, y, z, v and w are fractions of 1, a is in the range of about 25 to about 75 at%, b is in the range of about 10 about 50 is at%, c is in the range of about 12 to about 30 at%, and for the fractions x, y, z, v and w the following restrictions apply: x is 0 to 0.5; y is 0 to 1; z is 0 to 0.5; v is 0 to 0.5 and w is 0 to 1.
- Solid glass including the alloy Au49Ag5.5Pd2.3Cu26.9Sii6.3 [Au-BMG1], which has a white gold color and is classified as "Premium White” when polished.
- the glass transition temperature (Tg) is 128 ° C.
- Silica branches growing in the base material and embossed with copper oxide layers on the surface are very unusual, but has also been in crystalline
- Au-Cu-Si-based alloys show low nucleation temperatures along the Au-Cu axis at silicon concentrations of about 15-20 at% and solidify at sufficiently high cooling rates to form a glass. Replacing Cu with Au results in the glass transition temperature dropping well below 100 ° C, [7] making the alloys less suitable for jewelry applications. A low copper content does not necessarily lead to a higher corrosion resistance [1].
- Another solid gold-forming gold alloy having the composition Au5oSn6Cu26Sii8 is known from S. Wang and T. Chin, "Tin-modified gold-based bulk metallic glasses", Gold Bull. (2012) 45: 3-8, [8] a very low Tg of 82 ° C, which makes them less suitable for jewelry applications, and second, it was evidently only possible to obtain a cast thickness of 1 mm for the alloy,
- these alloys When cast, these alloys can reach a hardness of up to 360 HV.
- the thermoplastic molding process of these alloys may take place in a temperature range of about 100 to about 160 ° C, depending on the alloy composition.
- the aim of the invention was a suitable for jewelry applications
- gold alloy which can form solid glass in a wide range and less color change or corrosion, for. when wearing a jewelry made from it.
- the invention relates to an alloy of the composition.
- the invention relates to an alloy of the composition:
- L stands for In, Ga or Sn or
- L d is L 1 diL 2 d2 or L 1 diL 2 d2L 3 d3, where L 1 , L 2 and L 3 are selected from the elements In, Ga or Sn, and M is one or more of the elements Ni, Co and Fe stands; x and y are at%, where
- Another object of the invention is the production of this alloy and its use in the jewelry sector.
- FIGS. 1-3 show thermal DSC analyzes of three different alloy compositions according to the invention.
- the glass transition, the area of the supercooled melt and the crystallization event are clearly visible up to a thickness of 3 mm.
- Fig. 1 Alloy composition (at%):
- Composition (Aui-a-bAga (Pdi-cPtc) b) 100-xy (Cui-d-eLdMe) x (Sii-fGef) y , where L is In, Ga or Sn or Ld is L di L 2 d2 or L 1 is L 2 d 2 L 3 d3, wherein L 1 , L 2 and L 3 are selected from the elements In, Ga or Sn, M is one or more elements of the elements Ni, Co and Fe and a, b, c, d, e, f, x and y are as defined above, forming solid glasses in a wide compositional range.
- Reducing the silicon content of copper by in particular In, Ga and / or Sn can be substiutiert without the ability of solid glass formation is lost, whereby the susceptibility to corrosion is reduced.
- Alloy compositions y, y, a, b, d, d1, d2, d3, e and f are as follows:
- the preparation of the alloys can be accomplished as follows.
- the purity of the starting element materials employed is not particularly critical, a purity of more than 99%, preferably more than 99.9%, nor
- the special form of the starting material materials eg granules, platelets, flakes
- the starting material materials are weighed according to the desired stoichiometry with a precision balance. Subsequently, the output elements in a suitable device, for example a modified (water cooling, improved
- Kippgussstrom e.g., Indutherm MC15
- a suitable crucible e.g. an alumina crucible with or without Zirkonoxidbe Anlagenung arranged.
- the following order of elements in the crucible can be maintained (from bottom to top): Pd / Pt-Ag-Au-Cu / Ni / Co / Fe-Ga / Sn / In-Si / Ge, since this results in the formation of palladium - and / or platinum silicides is unlikely.
- a different order of the elements in the crucible can also lead to the desired result.
- the elements are inductively melted and homogenized.
- the melt is slowly heated to a temperature (effluent temperature) generally well above the liquidus temperature, typically about 400-450 ° C above, to ensure melt homogeneity, but longer residence times may also result in lower effluent temperatures.
- a temperature effluent temperature
- the temperature is constantly controlled by a pyrometer.
- the melt is poured into a suitable mold, e.g. a water-cooled copper mold, cast.
- the process preferably takes place under protective gas (Ar or N2).
- the casting can also be carried out in a vacuum. Already alloyed and remelted material can be cast at lower temperatures.
- the individual elements can also be used in an electric arc furnace
- the alloys can also be used in the
- Centrifugal casting method in which uncooled copper molds are used can be produced. Furthermore, the use of pressure-assisted casting process for the production of amorphous castings is possible (die-casting, suction casting method).
- thermoplastic molding TPF
- 3D printing processes For example, rods of the new alloys with a diameter made of 2-3 mm and thermoformed. It is obvious that jewelry can also be formed in this way.
- the pure elements (purity: Au (granules 1-5 mm), Ag (platelets), Pd (platelets): highest commercial purity; ln: 99.9975% (granules 1 -5 mm), Ga: 99.9999%
- Tipping system (Indutherm MC15) positioned in an alumina crucible. The following order of the elements in the crucible was observed: (from bottom to top): Pd-Ag-Au-Cu-Ga-Si.
- the elements were inductively melted and homogenized.
- the melt was heated slowly to a temperature of 1100 ° C-1200 ° C, the temperature was constantly monitored by a pyrometer. When the desired effluent temperature of 1100 ° C-1200 ° C was reached, the melt was cooled to the water
- the prepared sample is a rod with a diameter of 3 mm.
- the sample has a premium white color (according to classification of white gold alloys by the Yellowness Index (Yl D1925)).
- Glass transition temperature is 103 ° C at a heating rate of 20 ° C / min.
- the crystallization starts at 155 ° C.
- the solidus temperature is 340 ° C, the liquidus temperature 408 ° C.
- the critical thickness of the samples was determined by making samples of different diameter.
- the completely amorphous character of the samples was confirmed by X-ray diffractometry (Cu Kalpha, 20 ° ⁇ 2 ⁇ ⁇ 80 °). In addition, was in calorimetric
- Measurements (Perkin Elmer DSC8500) determined the enthalpy of crystallization of the respective X-ray amorphous 1 mm sample. By comparing the
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Adornments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016008074.4A DE102016008074A1 (de) | 2016-06-30 | 2016-06-30 | Massivglasbildende Weißgoldlegierung |
PCT/EP2017/000777 WO2018001564A1 (de) | 2016-06-30 | 2017-06-29 | Massivglasbildende weissgoldlegierung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3478864A1 true EP3478864A1 (de) | 2019-05-08 |
Family
ID=59350855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17739868.2A Withdrawn EP3478864A1 (de) | 2016-06-30 | 2017-06-29 | Massivglasbildende weissgoldlegierung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3478864A1 (de) |
DE (1) | DE102016008074A1 (de) |
WO (1) | WO2018001564A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018115815A1 (de) * | 2018-06-29 | 2020-01-02 | Universität des Saarlandes | Vorrichtung und Verfahren zur Herstellung eines aus einem amorphen oder teilamorphen Metall gebildeten Gussteils sowie Gussteil |
WO2024046742A1 (de) | 2022-08-29 | 2024-03-07 | Universität des Saarlandes | Legierung zur herstellung metallischer massivgläser sowie formkörper daraus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4781803A (en) * | 1985-02-26 | 1988-11-01 | The Standard Oil Company | Electrolytic processes employing platinum based amorphous metal alloy oxygen anodes |
US4728580A (en) * | 1985-03-29 | 1988-03-01 | The Standard Oil Company | Amorphous metal alloy compositions for reversible hydrogen storage |
WO2004047582A2 (en) * | 2002-11-22 | 2004-06-10 | Liquidmetal Technologies, Inc. | Jewelry made of precious amorphous metal and method of making such articles |
DE602005021136D1 (de) | 2004-10-15 | 2010-06-17 | Liquidmetal Technologies Inc | Glasbildende amorphe legierungen auf au-basis |
US20150344999A1 (en) * | 2014-05-30 | 2015-12-03 | Glassimetal Technology, Inc. | Gold-aluminum glasses bearing rare-earth metals |
-
2016
- 2016-06-30 DE DE102016008074.4A patent/DE102016008074A1/de not_active Withdrawn
-
2017
- 2017-06-29 EP EP17739868.2A patent/EP3478864A1/de not_active Withdrawn
- 2017-06-29 WO PCT/EP2017/000777 patent/WO2018001564A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
DE102016008074A1 (de) | 2018-01-04 |
WO2018001564A1 (de) | 2018-01-04 |
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