Gold containing preparation for coating metallic parts

• US 4,369,068 A
• Filed: 08/10/1981
• Issued: 01/18/1983
• Est. Priority Date: 08/10/1981
• Status: Expired due to Fees

• Current Assignee: Degussa AG (Rag-Stiftung)
• Original Assignee: Degussa AG (Rag-Stiftung)
• Inventors: Hausselt, Jurgen, Schiwiora, Harry, Stumke, Manfred
• Primary Examiner(s): Hayes, Lorenzo B.
• Application Number:
  US06/291,507
• Time in Patent Office: 526 Days
• Field of Search: 106/1.13, 106/1.15, 106/1.18, 106/193 M, 106/35, 252/514, 433/200, 433/206, 523/115
• US Class Current: 106/1.18
• CPC Class Codes: A61K 6/844 Noble metals
• CPC Class Codes: C09D 5/38 Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
• CPC Class Codes: C22C 1/0466 Alloys based on noble metals

Abstract

Gold-containing preparations which improve the adhesiveness, guarantee an esthetic appearance, and should make possible a saving in gold consumption are needed for the production of intermediate layers for the facings of fired on alloys in the dental art with ceramic compositions. This is accomplished with preparation that contain 50 to 94% gold powder having a particle size <30μ, 5-40% binder made of organic solvent and resin components are 1-20% of a metal powder whose particle size is greater than of the gold powder used and whose melting temperature is above that of gold.

Claims

1. A gold-containing preparation suitable for coating fired on alloys in the dental art before the facing with ceramic compositions, said preparation consisting essentially of gold powder, an adhesive and a binder of an organic solvent and a resin, said binder being liquid at room temperature and able to be volatilized or burned at the firing temperature, there being present 50 to 95 weight % gold powder having a particle size below 30μ

, 5 to 40 weight % of the binder and 1 to 20 weight % of a metal powder as adhesive, the metal powder having an average particle size of 10 to 27 microns greater than and a melting temperature above that of the gold powder.

2. A gold-containing preparation according to claim 1 containing 65 to 80 weight % gold powder, 15 to 25 weight % binder and 5 to 10 weight % metal powder.

3. A gold-containing preparation according to claim 2 wherein the particle size of the gold powder is below 10μ

.

4. A gold-containing preparation according to claim 1 wherein the particle size of the gold powder is below 10μ

.

5. A gold-containing preparation according to claim 4 wherein the metal powder is palladium, cobalt, or nickel or an alloy of palladium, cobalt, nickel or gold or mixtures thereof.

6. A gold containing preparation according to claim 3 wherein the metal powder is palladium, cobalt, or nickel or an alloy of palladium, cobalt, nickel or gold or mixtures thereof.

7. A gold-containing preparation according to claim 2 wherein the metal powder is palladium, cobalt, or nickel or an alloy of palladium, cobalt, nickel or gold or mixtures thereof.

8. A gold-containing preparation according to claim 1 wherein the metal powder is palladium, cobalt, or nickel or an alloy of palladium, cobalt, nickel or gold or mixtures thereof.

9. A gold-containing preparation according to claim 8 wherein the metal powder includes at least one alloying element which is present in the metallic part to be coated.

10. A gold-containing preparation according to claim 9 wherein the metal powder includes at least one alloying element which is present in the metallic part to be coated.

11. A gold-containing preparation according to claim 8 wherein the metal powder includes at least one alloying element which is present in the metallic part to be coated.

12. A gold-containing preparation according to claim 7 wherein the metal powder includes at least one alloying element which is present in the metallic part to be coated.

13. A gold-containing preparation according to claim 6 wherein the metal powder includes at least one alloying element which is present in the metallic part to be coated.

14. A gold-containing preparation according to claim 5 wherein the metal powder includes at least one alloying element which is present in the metallic part to be coated.

15. A gold-containing preparation according to claim 8 including an alloying element present in the metallic part to be coated, said alloying element being a member of the group consisting of tin, indium, chromium, molybdenum, silicon, manganese, iron, and mixtures of at least two of said alloying elements.

16. A gold-containing preparation according to claim 8 wherein the binder contains 10 to 40 weight % resin and 60 to 90 weight % solvent.

17. A gold-containing preparation according to claim 7 wherein the binder contains 10 to 40 weight % resin and 60 to 90 weight % solvent.

18. A gold containing preparation according to claim 8 including an alloying element present in the metallic part to be coated, said alloying element being a metal selected from the group consisting of tin, indium, chromium, molybdenum, manganese, iron, and mixtures of at least two of said alloying elements.