Bulk platinum-copper-phosphorus glasses bearing boron, silver, and gold

Patent metadata

Field	Value
Publication number	US-10036087-B2
Application number	US-201514667191-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 24, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

The disclosure provides Pt—Cu—P glass-forming alloys bearing at least one of B, Ag, and Au, where each of B, Ag, and Au can contribute to improve the glass forming ability of the alloy in relation to the alloy that is free of these elements. The alloys are capable of forming metallic glass rods with diameters in excess of 3 mm, and in some embodiments 50 mm or larger. The alloys and metallic glasses can satisfy platinum jewelry hallmarks PT750, PT800, PT850, and PT900.

First claim

What is claimed is:

1. An alloy capable of forming a metallic glass comprising:
Pt having an atomic fraction in the range of 45 to 75 percent, where the weight fraction of Pt does not exceed 91 percent;
Cu having an atomic fraction in the range of 3 to 35 percent;
P having an atomic fraction in the range of 14 to 26 percent;
at least one additional element selected from the group consisting of Ag, Au, and B where the atomic fraction of the at least one additional element is in the range of 0.05 to 7.5 percent;
optionally Ni in an atomic fraction of less than 2 percent; and
wherein the critical rod diameter of the alloy is at least 3 mm and wherein the solidus temperature of the alloy is greater than 477.6° C.

2. The alloy of claim 1 , wherein the atomic fraction of Pt is in the range of 45 to 60 percent, the atomic fraction of Cu is in the range of 15 to 35 percent, the atomic fraction of P is in the range of 17 to 24 percent, and wherein the Pt weight fraction is at least 80.0 percent.

3. The alloy of claim 1 , wherein the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of Cu is in the range of 15 to 30 percent, the atomic fraction of P is in the range of 17 to 24 percent, and wherein the Pt weight fraction is at least 85.0 percent.

4. The alloy of claim 1 , wherein the atomic fraction of Pt is in the range of 55 to 70 percent, the atomic fraction of Cu is in the range of 3 to 25 percent, the atomic fraction of P is in the range of 17 to 24 percent, and wherein the Pt weight fraction is at least 90.0 percent.

5. The alloy of claim 1 , wherein the atomic fraction of the at least one additional element selected from the group consisting of Ag, Au, and B is in the range of 0.2 to 5 percent.

6. The alloy of claim 1 , wherein the alloy also comprises at least one of Pd, Rh, and Ir, each in an atomic fraction of up to 5 percent.

7. The alloy of claim 1 , wherein the alloy also comprises at least one of Si, Ge, Sb, Sn, Zn, Fe, Ru, Cr, Mo, and Mn, each in an atomic fraction of up to 3 percent.

8. A metallic glass comprising an alloy of claim 1 .

9. An alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt (100-a-b-c-d-e) Cu a Ag b Au c P d B e
where:
a ranges from 3 to 35;
b is up to 7.5;
c is up to 7.5;
d ranges from 14 to 26;
e is up to 7.5;
wherein at least one of b, c, and e is at least 0.05;
wherein the Pt weight fraction is between 74 and 91 percent; and
wherein the critical rod diameter of the alloy is at least 3 mm.

10. The alloy of claim 9 , where a ranges from 5 to 30, d ranges from 14 to 24, e ranges from 0.25 to 6; and the atomic percent of Pt ranges from 45 to 75 percent.

11. The alloy of claim 10 , where the sum of d and e ranges from 19 to 24.

12. The alloy of claim 9 , where a ranges from 5 to 30, b ranges from 0.25 to 7.5, d ranges from 15 to 25; and the atomic percent of Pt ranges from 45 to 75 percent.

13. The alloy of claim 9 , where a ranges from 5 to 35, c ranges from 0.1 to 5, d ranges from 15 to 25; and the atomic percent of Pt ranges from 45 to 75 percent.

14. The alloy of claim 9 , where a ranges from 16 to 23, d ranges from 19 to 23, e ranges from 0.25 to 3; and the Pt weight fraction is at least 85.0.

15. The alloy of claim 9 , where a ranges from 19.5 to 21.5, d ranges from 20 to 22, e ranges from 1 to 1.5; and the Pt weight fraction is at least 85.0.

16. The alloy of claim 9 , where a ranges from 16 to 23, b ranges from 0.1 to 5, d ranges from 19 to 23, e ranges from 0.25 to 3, and the Pt weight fraction is at least 85.0 percent.

17. The alloy of claim 9 , where a ranges from 13 to 23, b ranges from 0.1 to 6, d ranges from 20 to 25, wherein the Pt weight fraction is at least 85.0 percent.

18. The alloy of claim 9 , where a ranges from 4 to 13, b ranges from 0.1 to 4, d ranges from 20 to 25, and the Pt weight fraction is at least 90.0 percent.

19. The alloy of claim 9 , where a ranges from 16 to 23, c ranges from 0.1 to 2.5, d ranges from 20 to 25, and the Pt weight fraction is at least 85.0 percent.

20. A metallic glass comprising an alloy of claim 9 .

Assignees

• Glassimetal Tech Inc
• Apple Inc

Inventors

• Na Jong Hyun
• Demetriou Marios D
• Abarca Oscar
• Launey Maximilien
• Johnson William L
• Garrett Glenn
• Duggins Danielle
• Crewdson Chase
• Han Kyung-Hee

Classifications

• C22C45/003 Primary

  with one or more of the noble metals as major constituent · CPC title

• C22C45/00

  Amorphous alloys (making amorphous non-ferrous alloys C22C1/11) · CPC title

• C22C5/04

  Alloys based on a platinum group metal · CPC title