AMORPHOUS PLATINUM-RICH ALLOYS

• US 20100230012A1
• Filed: 02/12/2010
• Published: 09/16/2010
• Est. Priority Date: 02/13/2009
• Status: Active Grant

• Current Assignee: California Institute of Technology
• Original Assignee: California Institute of Technology
• Inventors: Johnson, William L., Demetriou, Marios D.
• Granted Patent: US 8,361,250 B2
• Time in Patent Office: Days
• US Class Current: 148/403
• CPC Class Codes: A44C 27/003 Metallic alloys alloys in general C22C
• CPC Class Codes: C22C 1/11 Making amorphous alloys
• CPC Class Codes: C22C 45/003 with one or more of the noble metals as major constituent
• CPC Class Codes: C22C 5/04 Alloys based on a platinum group metal

Abstract

According to embodiments of the present invention, an amorphous alloy includes at least Pt, P, Si and B as alloying elements, and has a Pt weight fraction of about 0.925 or greater. In some embodiments, the Pt weight fraction is about 0.950 or greater.

Claims

1. An amorphous alloy comprising at least Pt, P, Si and B as alloying elements, wherein the Pt is present in the alloy at a weight fraction of about 0.925 or greater.

2. The amorphous alloy of claim 1 further comprising an additional alloying element selected from the group consisting of Cu, Ag, Ni, Pd, Au, Co, Fe, Ru, Rh, Ir, Re, Os, Sb, Ge, Ga, Al, and combinations thereof.

3. The amorphous alloy of claim 2, wherein the additional alloying element comprises Cu.

4. The amorphous alloy of claim 3, wherein the Cu is present in an atomic fraction of about 0.015 to about 0.025, the P is present in the alloy in an atomic fraction of about 0.15 to about 0.185, the B is present in the alloy in an atomic fraction of about 0.02 to about 0.06, and the Si is present in the alloy in an atomic fraction of about 0.005 to about 0.025.

5. The amorphous alloy of claim 2, wherein the additional alloying element comprises Cu and Ag.

6. The amorphous alloy of claim 5, wherein the atomic ratio of Cu to Ag present in the alloy ranges from about 2 to about 10.

7. The amorphous alloy of claim 5, wherein the atomic ratio of Cu to Ag present in the alloy is about 5.

8. The amorphous alloy of claim 5, wherein the Cu is present in the alloy in an atomic fraction of about 0.01 to about 0.02, the Ag is present in the alloy in an atomic fraction of about 0.001 to about 0.01, the P is present in the alloy in an atomic fraction of about 0.15 to about 0.185, the B is present in the alloy in an atomic fraction of about 0.02 to about 0.06, and the Si is present in the alloy in an atomic fraction of about 0.005 to about 0.025.

9. The amorphous alloy of claim 1, wherein the Pt is present in the alloy in a weight fraction of about 0.950 or greater.

10. The amorphous alloy of claim 1, wherein the P is present in an atomic fraction ranging from about 0.10 to about 0.20.

11. The amorphous alloy of claim 1, wherein the P is present in an atomic fraction of about 0.18.

12. The amorphous alloy of claim 1, wherein the B is present in an atomic fraction ranging from about 0.01 to about 0.10.

13. The amorphous alloy of claim 1, wherein the B is present in an atomic fraction of about 0.04.

14. The amorphous alloy of claim 1, wherein the Si is present in an atomic fraction ranging from about 0.005 to about 0.05.

15. The amorphous alloy of claim 1, wherein the Si is present in an atomic fraction of about 0.015.

16. The amorphous alloy of claim 1, wherein the alloy comprises an alloy selected from the group consisting of Pt_0.765P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.02P_0.18B_0.04Si_0.015, Pt_0.7435Cu_0.0215P_0.18B_0.04Si_0.015, Pt_0.7425Cu_0.0125Ni_0.01P_0.18B_0.04Si_0.015, Pt_0.7456Cu_0.0159Ag_0.0035P_0.18B_0.04Si_0.015, Pt_0.744Cu_0.015Ni_0.004Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.013Ni_0.003Pd_0.002Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.747Cu_0.015Ag_0.003P_0.18B_0.04Si_0.015, Pt_0.71625Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.18B_0.04Si_0.015, Pt_0.7Cu_0.055Ag_0.01P_0.18B_0.04Si_0.015, Pt_0.75Cu_0.05P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.035Ni_0.015P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.035Pd_0.015P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.025Ni_0.02Pd_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.025Ni_0.02Cr_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.02Ni_0.02Pd_0.005Ag_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.02Ni_0.02Pd_0.005Co_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.015Ni_0.02Pd_0.005Ag_0.005Au_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.015Ni_0.02Pd_0.005Ag_0.005Fe_0.005P_0.125B_0.05Si_0.025, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.115B_0.09Si_0.015, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.1725B_0.02Si_0.0275, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.14B_0.04Si_0.04, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.17B_0.04Si_0.01, Pt_0.71125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.185B_0.04Si_0.015, wherein the subscripts denote approximate atomic fractions.

17. The amorphous alloy of claim 1, wherein the alloy comprises an alloy selected from the group consisting of Pt_0.765P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.02P_0.18B_0.04Si_0.015, Pt_0.7435Cu_0.0215P_0.18B_0.04Si_0.015, Pt_0.7425Cu_0.0125Ni_0.01P_0.18B_0.04Si_0.015, Pt_0.7456Cu_0.0159Ag_0.0035P_0.18B_0.04Si_0.015, Pt_0.744Cu_0.015Ni_0.004Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.013Ni_0.003Pd_0.002Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.747Cu_0.015Ag_0.003P_0.18B_0.04Si_0.015, Pt_0.71625Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.18B_0.04Si_0.015, Pt_0.7Cu_0.055Ag_0.01P_0.18B_0.04Si_0.015, wherein the subscripts denote approximate atomic fractions.

18. The amorphous alloy of claim 1, wherein the alloy comprises an alloy selected from the group consisting of Pt_0.765P_0.18B_0.04Si_0.015, Pt_0.747Cu_0.015Ag_0.003P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.02P_0.18B_0.04Si_0.015, and Pt_0.7Cu_0.055Ag_0.01P_0.18B_0.04Si_0.015, wherein the subscripts denote approximate atomic fractions.

19. A three-dimensional object formed of the amorphous alloy of claim 1.

20. The three-dimensional object of claim 19, wherein the three-dimensional object has a critical casting thickness of about 0.5 mm or greater.

21. The three-dimensional object of claim 19, wherein the amorphous alloy comprises an alloy selected from the group consisting of Pt_0.765P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.02P_0.18B_0.04Si_0.015, Pt_0.7435Cu_0.0215P_0.18B_0.04Si_0.015, Pt_0.7425Cu_0.0125Ni_0.01P_0.18B_0.04Si_0.015, Pt_0.7456Cu_0.0159Ag_0.0035P_0.18B_0.04Si_0.015, Pt_0.744Cu_0.015Ni_0.004Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.013Ni_0.003Pd_0.002Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.747Cu_0.015Ag_0.003P_0.18B_0.04Si_0.015, Pt_0.71625Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.18B_0.04Si_0.015, Pt_0.7Cu_0.055Ag_0.01P_0.18B_0.04Si_0.015, Pt_0.75Cu_0.05P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.035Ni_0.015P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.035Pd_0.015P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.025Ni_0.02Pd_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.025Ni_0.02Cr_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.02Ni_0.02Pd_0.005Ag_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.02Ni_0.02Pd_0.005Co_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.015Ni_0.02Pd_0.005Ag_0.005Au_0.005P_0.125B_0.05Si_0.025, Pt_0.75Cu_0.015N_0.02Pd_0.005Ag_0.005Fe_0.005P_0.125B_0.05Si_0.025, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.115B_0.09Si_0.015, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.1725B_0.02Si_0.0275, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.14B_0.04Si_0.04, Pt_0.73125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.17B_0.04Si_0.01, Pt_0.71125Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.185B_0.04Si_0.015, wherein the subscripts denote approximate atomic fractions.

22. The three-dimensional object of claim 19, wherein the amorphous alloy comprises an alloy selected from the group consisting of Pt_0.765P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.02P_0.18B_0.04Si_0.015, Pt_0.7435Cu_0.0215P_0.18B_0.04Si_0.015, Pt_0.7425Cu_0.0125Ni_0.01P_0.18B_0.04Si_0.015, Pt_0.7456Cu_0.0159Ag_0.0035P_0.18B_0.04Si_0.015, Pt_0.744Cu_0.015Ni_0.004Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.013Ni_0.003Pd_0.002Ag_0.002P_0.18B_0.04Si_0.015, Pt_0.747Cu_0.015Ag_0.003P_0.18B_0.04Si_0.015, Pt_0.71625Cu_0.0195Ni_0.0195Pd_0.004875Ag_0.004875P_0.18B_0.04Si_0.015, Pt_0.7Cu_0.055Ag_0.01P_0.18B_0.04Si_0.015, wherein the subscripts denote approximate atomic fractions.

23. The three-dimensional object of claim 19, wherein the amorphous alloy comprises an alloy selected from the group consisting of Pt_0.765P_0.18B_0.04Si_0.015, Pt_0.747Cu_0.015Ag_0.003P_0.18B_0.04Si_0.015, Pt_0.745Cu_0.02P_0.18B_0.04Si_0.015, and Pt_0.7Cu_0.55Ag_0.01P_0.18B_0.04Si_0.015, wherein the subscripts denote approximate atomic fractions.