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

• US 4,537,625 A
• Filed: 03/09/1984
• Issued: 08/27/1985
• Est. Priority Date: 03/09/1984
• Status: Expired due to Fees

• Current Assignee: Standard Oil Company (BP PLC)
• Original Assignee: Standard Oil Company (BP PLC)
• Inventors: Henderson, Richard S., Fox, Joseph R., Tenhover, Michael A.
• Primary Examiner(s): Stallard, Wayland
• Application Number:
  US06/588,014
• Time in Patent Office: 536 Days
• Field of Search: 148/403, 75/0.5 A, 75/0.5 AA, 75/0.5 B, 75/0.5 BA, 75/0.5 C, 75/251
• US Class Current: 419/36
• CPC Class Codes: B22F 1/054 Nanosized particles
• CPC Class Codes: B22F 1/08 Metallic powder characterised by particles having an amorphous microstructure
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• 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 9/24 starting from liquid metal compounds, e.g. solutions
• 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 may be synthesized by solid state reactions. Precursor components that include the elements of the amorphous alloy are chemically reduced to yield an intimate mixture. The resultant intimate mixture, as obtained or after heat-treating, exhibits amorphous characteristics. These powders are suitable for forming solid amorphous shapes.

Claims

1. A process for the synthesis of a substantially amorphous metal alloy powder comprising disposing at least one metal-bearing compound in a liquid medium and reducing the at least one metal-bearing compound so as to form a substantially amorphous metal powder.

2. The process in accordance with claim 1 wherein said powder is further processed into a solid shape.

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

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

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

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

7. The process in accordance with claim 6 wherein said nonmetallic elements include boron, carbon, nitrogen, silicon, phosphorus, arsenic, germanium and antimony.

8. The process in accordance with claim 1 wherein said liquid medium is aqueous.

9. The process in accordance with claim 1 wherein said at least one metal-bearing compound is reduced in the presence of a chemical reducing agent.

10. The process in accordance with claim 9 wherein said chemical reducing agent is a compound selected from the group comprising hydrogen, hydrazine, hydroxyl amines, alkali borohydrides, alkali-hydrogen-phosphites and alkali hypophosphites.

11. The process in accordance with claim 9 wherein said chemical reducing agent is sodium borohydride.

12. The process in accordance with claim 1 wherein prior to reducing said at least one metal-bearing compound said liquid medium is degassed with nitrogen, and inert gas or a reducing gas.

13. 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 1,000 Angstroms.

14. 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.

33. 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.

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

(a) disposing at least one metal-bearing compound in a liquid medium;

(b) reducing said at least one metal-bearing compound so as to obtain an intimate mixture of the component of the amorphous metal alloy to be synthesized; and

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

16. The process in accordance with claim 15 wherein said substantially amorphous metal alloy is synthesized as a powder.

17. The process in accordance with claim 15 wherein prior to step (c) said intimate mixture of the components of the amorphous metal alloy to be synthesized is pressed into a shape.

18. The process in accordance with claim 15 wherein said substantially amorphous metal alloy of step (c) is formed into a solid shape.

19. The process in accordance with claim 15 wherein said substantially amorphous metal alloy is at least 50 percent amorphous.

20. The process in accordance with claim 15 wherein said substantially amorphous metal alloy is at least 80 percent amorphous.

21. The process in accordance with claim 15 wherein said substantially amorphous metal alloy is about 100 percent amorphous.

22. The process in accordance with claim 15 wherein said process synthesizes an amorphous metal alloy composition including nonmetallic elements.

23. The process in accordance with claim 22 wherein said nonmetallic elements include boron, carbon, nitrogen, silicon, phosphorus, arsenic, germanium and antimony.

24. The process in accordance with claim 15 wherein said liquid medium is aqueous.

25. The process in accordance with claim 15 wherein said reducing of the at least one metal-bearing compound occurs with a chemical reducing agent.

26. The process in accordance with claim 25 wherein said chemical reducing agent is selected from the group comprising hydrogen, hydrazine and sodium borohydride.

27. The process in accordance with claim 25 wherein said chemical reducing agent is sodium borohydride.

28. The process in accordance with claim 15 wherein prior to reducing the at least one metal-bearing compound said liquid medium is degased with nitrogen, an inert gas or a reducing gas.

29. The process in accordance with claim 15 wherein said intimate mixture is maintained in an oxygen-free atmosphere.

30. The process in accordance with claim 15 wherein said intimate mixture is heat-treated in a vacuum.

31. The process in accordance with claim 15 wherein said heat-treating is performed at a temperature below the crystallization temperature of the amorphous alloy to be formed.

32. The process in accordance with claim 15 wherein said substantially amorphous metal alloy has a maximum particle size of from about 10 Angstroms to about 1,000 Angstroms.

34. A substantially amorphous metal alloy powder synthesized by disposing at least one metal-bearing compound in a liquid medium, reducing the at least one metal-bearing compound so as to form an intimate mixture of the alloy components, and heat-treating said intimate mixture to form the amorphous metal alloy.

35. The substantially amorphous metal alloy powder in accordance with claim 34 wherein said amorphous metal alloy powder is at least 50 percent amorphous.

36. The substantially amorphous metal alloy powder in accordance with claim 34 wherein said amorphous metal alloy powder is at least 80 percent amorphous.

37. The substantially amorphous metal alloy powder in accordance with claim 34 wherein said amorphous metal alloy powder is about 100 percent amorphous.

38. The substantially amorphous metal alloy powder in accordance with claim 34 wherein the amorphous metal alloy composition includes nonmetallic elements.

39. The substantially amorphous metal alloy powder in accordance with claim 34 wherein the amorphous metal alloy composition includes nonmetallic elements selected from the group comprising boron, carbon, nitrogen, silicon, phosphorus, arsenic, germanium and antimony.

40. The substantially amorphous metal alloy powder in accordance with claim 34 wherein said powder has a maximum particle size of from about 10 Angstroms to about 1,000 Angstroms.

41. The substantially amorphous metal alloy powder in accordance with claim 34 wherein said powder has a maximum particle size of from about 10 Angstroms to about 500 Angstroms.