Amorphous metal alloy powders and synthesis of same by solid state decomposition reactions

• US 4,537,624 A
• Filed: 03/05/1984
• Issued: 08/27/1985
• Est. Priority Date: 03/05/1984
• Status: Expired due to Fees

• Current Assignee: Standard Oil Company (BP PLC)
• Original Assignee: Standard Oil Company (BP PLC)
• Inventors: Grasselli, Robert K., Henderson, Richard S., Tenhover, Michael A.
• Primary Examiner(s): Stallard, Wayland
• Application Number:
  US06/586,380
• Time in Patent Office: 540 Days
• Field of Search: 75/0.5 B, 75/0.5 BA, 75/0.5 BB, 75/0.5 BC, 75/251, 75/252, 148/403, 148/11.5 P
• US Class Current: 148/403
• CPC Class Codes: B22F 3/007 by diffusion starting from non-amorphous articles prepared by powder metallurgy
• CPC Class Codes: B22F 9/004 by diffusion, e.g. solid state reaction
• CPC Class Codes: B22F 9/30 with decomposition of metal compounds, e.g. by pyrolysis
• CPC Class Codes: C22C 1/04 by powder metallurgy C22C1/08 takes precedence
• CPC Class Codes: Y10S 505/804 Amorphous alloy
• CPC Class Codes: Y10S 505/807 Powder

Abstract

Amorphous metal alloy powders are synthesized by solid state decomposition reactions. At least one precursor compound is thermally decomposed at a temperature below the crystallization temperature of the amorphous metal alloy to be formed. The decomposition product comprises an intimate mixture of the elements of the alloy and, after heat-treating if necessary, exhibits amorphous characteristics.

Claims

1. A process for the synthesis of a substantially amorphous metal alloy comprising thermally decomposing at least one precursor metal-bearing compound at a temperature below the crystallization temperature of the amorphous metal alloy to be formed, the at least one precursor metal-bearing compound having a decomposition temperature below the crystallization temperature of the amorphous alloy to be formed and containing the metals which comprise the substantially amorphous metal alloy.

2. The process in accordance with claim 1 wherein said substantially amorphous metal alloy is obtained as a power.

3. The process in accordance with claim 2 wherein said powder is further processed into a solid shape.

4. The process in accordance with claim 1 wherein the amorphous metal alloy formed is at least 50 percent amorphous.

5. The process in accordance with claim 1 wherein the amorphous metal alloy formed is at least 80 percent amorphous.

6. The process in accordance with claim 1 wherein the amorphous metal alloy formed is about 100 percent amorphous.

7. The process in accordance with claim 1 wherein said process synthesizes an amorphous metal alloy composition including nonmetallic elements.

8. The process in accordance with claim 7 wherein the thermal decomposition occurs under an atmosphere comprising said nonmetallic elements.

9. The process in accordance with claim 1 wherein the said thermal decomposition occurs at a temperature at least 25°

C. below the crystallization temperature of the amorphous metal alloy to be formed.

10. The process in accordance with claim 1 wherein said thermal decomposition occurs at a temperature at least 100°

C. below the crystallization temperature of the amorphous metal alloy to be formed.

11. The process in accordance with claim 1 wherein said decomposition temperature is between about 25°

C. and about 500°

C.

12. The process in accordance with claim 1 wherein said decomposition temperature is between about 250°

C. and about 400°

C.

13. The process in accordance with claim 1 wherein said thermal decomposition occurs under an inert atmosphere.

14. The process in accordance with claim 1 wherein said decomposition occurs under a reactive atmosphere.

15. The process in accordance with claim 1 wherein said at least one precursor metal-bearing compound is an organometallic compound.

16. The process in accordance with claim 1 wherein said substantially amorphous metal alloy has a maximum particle size of from about 10 Angstroms to about 1000 Angstroms.

17. The process in accordance with claim 1 wherein said substantially amorphous metal alloy has a maximum particle size of from about 10 Angstroms to about 500 Angstroms.

23. The process in accordance with claim 17 wherein said formed substantially amorphous metal alloy is at least 50 percent amorphous.

33. The process in accordance with claim 9 wherein said heat-treating of the intimate mixture is performed under a reactive atmosphere.

18. A process for the synthesis of an enhanced substantially amorphous metal alloy comprising thermally decomposing at least one precursor metal-bearing compound in the presence of an initial substantially amorphous metal alloy at a temperature below the crystallization temperatures of the initial substantially amorphous metal alloy and the enhanced substantially amorphous metal alloy to be formed, the at least one precursor metal-bearing compound containing additional elements to be incorporated into the initial metal alloy so as to form an enhanced substantially amorphous metal alloy.

19. A process for the synthesis of a substantially amorphous metal alloy comprising the steps of:

(a) decomposing at least one precursor metal-bearing compound at a temperature below the crystallization temperature of the amorphous metal alloy to be synthesized so as to form an intimate mixture of the components of the amorphous metal alloy to be synthesized, the at least one precursor metal-bearing compound containing the metals which comprise the substantially amorphous alloy; and

(b) heat-treating the intimate mixture so as to form the substantially amorphous metal alloy.

20. The process in accordance with claim 19 wherein said substantially amorphous metal alloy is synthesized as a powder.

21. The process in accordance with claim 19 wherein prior to step (b) said intimate mixture of the components of the amorphous metal alloy to be synthesized is pressed into a shape.

22. The process in accordance with claim 19 wherein said substantially amorphous metal alloy of step (b) is formed into a solid shape.

24. The process in accordance with claim 19 wherein said formed substantially amorphous metal alloy is at least 80 percent amorphous.

25. The process in accordance with claim 19 wherein said formed substantially amorphous metal alloy is about 100 percent amorphous.

26. The process in accordance with claim 19 wherein said process synthesizes an amorphous metal alloy composition including nonmetallic elements.

27. The process in accordance with claim 26 wherein heat-treating of the intimate mixture occurs under an atmosphere comprising said nonmetallic elements.

28. The process in accordance with claim 19 wherein said at least one precursor metal bearing compound is decomposed at a temperature at least 25°

below the crystallization temperature of the amorphous metal alloy to be synthesized.

29. The process in accordance with claim 19 wherein said at least one precursor metal-bearing compound is decomposed at a temperature at least 100°

C. below the crystallization temperature of the amorphous metal alloy to be synthesized.

30. The process in accordance with claim 19 wherein said at least one precursor metal-bearing compound is decomposed at a temperature of between about 25°

C. and about 500°

C.

31. The process in accordance with claim 19 wherein said at least one precursor metal-bearing compound is decomposed at a temperature of between about 250°

C. and about 400°

C.

32. The process in accordance with claim 19 wherein said heat-treating of the intimate mixture is performed under an inert atmosphere.

34. The process in accordance with claim 19 wherein at least one precursor metal-bearing compound is an organometallic compound.

35. The process in accordance with claim 19 wherein said intimate mixture comprises particles having a maximum particle size of from about 10 Angstroms to about 1000 Angstroms.

36. The process in accordance with claim 19 wherein said intimate mixture comprises particles having maximum particles size of from about 10 Angstroms to about 500 Angstroms.

37. A process for the synthesis of an enhanced substantially amorphous metal alloy comprising the steps of:

(a) decomposing at least one precursor metal-bearing compound in the presence of an initial substantially amorphous metal alloy at a temperature below the crystallization temperature of the enhanced substantially amorphous metal alloy to be synthesized so as to form an intimate mixture of the components of the enhanced amorphous metal alloy to be synthesized; and

(b) heat-treating the mixture so as to form an enhanced substantially amorphous metal alloy.

38. A substantially amorphous metal alloy powder having a maximum particle size of from about 10 Angstroms to about 1,000 Angstroms synthesized by thermally decomposing at least one precursor metal-bearing compound at a temperature below the crystallization temperature of the amorphous metal alloy, the at least one precursor metal-bearing compound containing the metals that comprise the substantially amorphous metal alloy.

39. The substantially amorphous metal alloy powder in accordance with claim 38 wherein said amorphous metal alloy powder is at least 50 percent amorphous.

40. The substantially amorphous metal alloy powder in accordance with claim 38 wherein said amorphous metal alloy powder is at least 80 percent amorphous.

41. The substantially amorphous metal alloy powder in accordance with claim 38 wherein said amorphous metal alloy powder is about 100 percent amorphous.

42. The substantially amorphous metal alloy powder in accordance with claim 38 wherein the amorphous metal alloy composition includes nonmetallic elements.

43. The substantially amorphous metal alloy powder in accordance with claim 38 wherein the amorphous metal alloy composition includes nonmetallic elements selected from the group comprising boron, carbon, nitrogen, silicon, phosphorus, arsenic, germanium and antimony.

44. The substantially amorphous metal alloy powder in accordance with claim 38 wherein said powder has a maximum particle size of from about 10 Angstroms to about 500 Angstroms.