EP0717118B1 - Verfahren zur Herstellung von Gussformstücken aus Gold-Titan-Legierungen - Google Patents
Verfahren zur Herstellung von Gussformstücken aus Gold-Titan-Legierungen Download PDFInfo
- Publication number
- EP0717118B1 EP0717118B1 EP95117228A EP95117228A EP0717118B1 EP 0717118 B1 EP0717118 B1 EP 0717118B1 EP 95117228 A EP95117228 A EP 95117228A EP 95117228 A EP95117228 A EP 95117228A EP 0717118 B1 EP0717118 B1 EP 0717118B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gold
- alloy
- titanium
- melting
- crucible
- 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.)
- Expired - Lifetime
Links
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C27/00—Making jewellery or other personal adornments
- A44C27/001—Materials for manufacturing jewellery
- A44C27/002—Metallic materials
- A44C27/003—Metallic alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
- B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
Definitions
- the invention relates to a method for producing Moldings made of gold-titanium alloys with 0.1 to 4 % By weight titanium, in particular for dental and jewelry parts, by melting portions of the alloy on the Air and subsequent potting.
- High gold containing precious metal alloys are the traditional alloy systems used for this purpose be used. You have been around for many years clinically proven. In corrosion resistance and These alloys are still biocompatible unmatched. The numerous requirements placed on this Until now, alloys could only be provided with in generally very complex alloy systems be fulfilled.
- the high gold alloys are characterized by a gold content from approx. 70 Wt.%. To increase high temperature stability during The ceramic fire is usually palladium and platinum alloyed. To increase hardness and mechanical Strength will be quite a number of different Base metals added. Other items will be alloyed to fine-tune further dental technology relevant data, such as coefficient of thermal expansion, Ceramic adhesion, oxide color or sufficient ductility to ensure high temperature.
- Alloy elements are for example silver, copper, Indium, zinc, tin and iron. It is known that a number these elements also have undesirable properties may have, so that an attempt is made to avoid them or use only in small quantities. For example Silver can cause green discoloration of sensitive ceramics and copper can occur especially when Crevice corrosion effects lead to discoloration.
- dental bonding alloys For reasons of optimal biocompatibility and Aesthetics, it would be desirable to have dental bonding alloys to have available that are only made of gold and one other harmless element exist and the regarding the color and the corrosion resistance as well as the Processability is as close as possible to pure gold and at the same time have the mechanical strength that of a type 4 alloy.
- EP-A-0 190 648 are gold-titanium alloys with 0.1 up to 4% by weight of titanium, which is known as a material for Pieces of jewelry or coins can be used. This Alloys are harder and therefore more abrasion-resistant than pure ones Gold. They also show a brilliant gold color.
- Titanium has as an alloy component in the molten material State of great responsiveness with the Air components and the crucible materials below Formation of, for example, oxides, nitrides or Carbides. This forms during the melting and Shedding disruptive layers of slag, which also the composition of the alloy and thus its Change properties.
- EP-A-0 190 648 is used for melting and casting the alloy melt of gold and titanium therefore in a vacuum or under protective gas in the form of argon.
- the melting takes place in a ceramic crucible, the casting in one Graphite mold.
- both materials are only usable under vacuum or argon atmosphere, if one Slag formation should be avoided. Done in air a slag formation with depletion of the titanium content the alloy and the ceramic crucible becomes unusable.
- EP-A-0 153 559 describes a process for the production of moldings from low-gold Dental alloys known, which may contain up to 1 wt.% Titanium. To a Allow melting in graphite crucibles without causing unwanted blistering through carbon absorption, alloying measures are required to to bring about a necessary reduction in the melting interval.
- a graphite crucible Preferably used to melt the gold-titanium alloy a graphite crucible.
- the graphite contain a few percent of another material.
- the casting pieces made of gold-titanium alloys with 0.1 to 4 % By weight of titanium can be obtained with the commercially available Blend dental ceramics very well.
- Titanium content can also be the hardness of the moldings vary.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Dental Prosthetics (AREA)
- Adornments (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Mold Materials And Core Materials (AREA)
- Catalysts (AREA)
Description
Claims (3)
- Verfahren zur Herstellung von Gußformstücken aus hochgoldhaltigen Gold-Titan-Legierungen mit 0,1 bis 4 Gew.% Titan, insbesondere für Dental- und Schmuckteile, durch Aufschmelzen von Portionsstücken der Legierung an der Luft und anschließendes Vergießen,
dadurch gekennzeichnet, daß ein Schmelztiegel verwendet wird, dessen mit der Legierungsschmelze in Kontakt kommende Flächen aus Kohlenstoff bestehen. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß als Schmelztiegel ein Graphit-Tiegel verwendet wird. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß zum Beschicken des Schmelztiegels Portionsstücke mit einem möglichst kleinen Verhältnis Oberfläche zu Volumen eingesetzt werden und die Zahl der Portionsstücke zum Erreichen der Schmelzenmenge 1 bis 5 beträgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4439793 | 1994-11-08 | ||
DE4439793A DE4439793C2 (de) | 1994-11-08 | 1994-11-08 | Verfahren zur Herstellung von Gußformstücken aus Gold-Titan-Legierungen |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0717118A2 EP0717118A2 (de) | 1996-06-19 |
EP0717118A3 EP0717118A3 (de) | 1997-01-29 |
EP0717118B1 true EP0717118B1 (de) | 2003-08-27 |
EP0717118B8 EP0717118B8 (de) | 2004-01-02 |
Family
ID=6532729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95117228A Expired - Lifetime EP0717118B8 (de) | 1994-11-08 | 1995-11-02 | Verfahren zur Herstellung von Gussformstücken aus Gold-Titan-Legierungen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0717118B8 (de) |
AT (1) | ATE248237T1 (de) |
DE (2) | DE4439793C2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7279054B2 (en) | 2004-05-14 | 2007-10-09 | The Argen Corporation | Dental prosthesis method and alloys |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2302837C3 (de) * | 1973-01-20 | 1975-09-11 | Dr. Th. Wieland Scheideanstalt, 7530 Pforzheim | Dental-Goldlegierung |
DE3406711C1 (de) * | 1984-02-24 | 1985-04-25 | Degussa Ag, 6000 Frankfurt | Goldarme Dental-Legierungen |
DE3502914A1 (de) * | 1985-01-29 | 1986-07-31 | International Gold Corp. Ltd., Johannesburg | Verwendung titanhaltiger goldlegierungen |
EP0691123B2 (de) * | 1994-07-05 | 2001-09-26 | Cendres Et Metaux S.A. | Hochgoldhaltige Dentallegierung |
-
1994
- 1994-11-08 DE DE4439793A patent/DE4439793C2/de not_active Expired - Fee Related
-
1995
- 1995-11-02 AT AT95117228T patent/ATE248237T1/de active
- 1995-11-02 DE DE59510778T patent/DE59510778D1/de not_active Expired - Lifetime
- 1995-11-02 EP EP95117228A patent/EP0717118B8/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0717118A3 (de) | 1997-01-29 |
DE4439793C2 (de) | 2001-05-23 |
ATE248237T1 (de) | 2003-09-15 |
DE59510778D1 (de) | 2003-10-02 |
EP0717118B8 (de) | 2004-01-02 |
DE4439793C1 (de) | 1995-10-26 |
EP0717118A2 (de) | 1996-06-19 |
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