Stabilizers for composite electroless plating

• US 6,306,466 B1
• Filed: 05/02/1994
• Issued: 10/23/2001
• Est. Priority Date: 04/01/1981
• Status: Expired due to Term

• Current Assignee: Surface Technology Incorporated
• Original Assignee: Surface Technology Incorporated
• Inventors: Feldstein, Nathan, Lindsay, Deborah Jane
• Primary Examiner(s): Utech, Benjamin L.
• Application Number:
  US08/236,006
• Time in Patent Office: 2,731 Days
• Field of Search: 427/437, 427/443.1
• US Class Current: 427/437
• CPC Class Codes: C23C 18/1637 metallic substrate
• CPC Class Codes: C23C 18/1662 Use of incorporated material in the solution or dispersion, e.g. particles, whiskers, wires
• CPC Class Codes: C23C 18/1692 Heat-treatment
• CPC Class Codes: C23C 18/31 Coating with metals
• CPC Class Codes: C23C 18/36 using hypophosphites

Abstract

A process of electrolessly metallizing a body on the surface thereof with a metal coating incorporating particulate matter therein, which process comprises contacting the surface of said body with a stable electroless metallizing bath comprising a metal salt, an electroless reducing agent, a complexing agent, an electroless plating stabilizer, a quantity of particulate matter which is essentially insoluble or sparingly soluble in the metallizing bath, and a particulate matter stabilizer (PMS), and maintaining said particulate matter in suspension in said metallizing bath during the metallizing of said body for a time sufficient to produce a metallic coating with said particulate matter dispersed therein.

Claims

1. A process for electrolessly metallizing a body to provide on the surface thereof a metal coating incorporating therein particulate matter which comprises contacting the surface of said body with an electroless metallizing bath comprising an aqueous solution of a metal salt, a reducing agent, a quantity of insoluble particulate matter and a quantity of particulate matter stabilizer, wherein said particulate matter stabilizer shifts the Zeta potential for said insoluble particulate matter by at least 10 mv in comparison to the measured Zeta potential of said insoluble particulate matter alone in water.

2. The process according to claim 1 wherein said particulate matter stabilizer is a surfactant comprising a fluorocarbon compound.

3. The process according to claim 1 wherein said particulate matter stabilizer is a surfactant comprising a hydrocarbon.

4. The process according to claim 1 wherein said metal salt comprises nickel.

5. The process according to claim 1 wherein said reducing agent is sodium hypophosphite.

6. The process according to claim 1 wherein said electroless metallizing bath further comprises ammonium ions.

7. The process according to claim 1 wherein said particulate matter comprises wear-resistant particles.

8. The process according to claim 1 wherein said particulate matter comprises lubricating particles.

9. The process according to claim 1 wherein said particulate matter is a fluoride derivative.

10. A process of electrolessly metallizing a body to provide on the surface thereof a metal coating incorporating therein finely divided particulate matter which comprises contacting the surface of said body with an electroless metallizing bath comprising an aqueous solution of a metal salt, an electroless reducing agent, a complexing agent and/or chelating agent, insoluble particulate matter dispersed therein and a non-ionic particulate matter stabilizer capable of shifting the Zeta potential for said insoluble particulate matter by at least 5 mv in comparison to the measured Zeta potential of said insoluble particulate matter in water alone.

11. The process according to claim 10 wherein said particulate matter stabilizer is a surfactant comprising a fluorocarbon compound.

12. The process according to claim 10 wherein said particulate matter stabilizer is a surfactant comprising a hydrocarbon.

13. The process according to claim 10 wherein said metal salt comprises nickel.

14. The process according to claim 10 wherein said reducing agent is sodium hypophosphite.

15. The process according to claim 10 wherein said electroless metallizing bath further comprises ammonium ions.

16. The process according to claim 10 wherein said particulate matter comprises lubricating particles.

17. The process according to claim 10 wherein said particulate matter wear resistant particles.

18. The process according to claim 10 wherein said particulate matter is a fluoride derivative.

19. The process of electrolessly metallizing a body to provide on the surface thereof a metal coating incorporating therein finely divided particulate matter which comprises contacting the surface of said body with an electroless metallizing bath comprising an aqueous solution of the metal salt, an electroless reducing agent, a quantity of finely divided insoluble particulate matter, and a quantity of an anionic particulate matter stabilizer capable of shifting the Zeta potential for said insoluble particulate matter by at least 15 mv in comparison to the measured Zeta potential of said insoluble particulate matter alone in water.

20. The process according to claim 19 wherein said particulate matter is a surfactant comprising a fluorocarbon compound.

21. The process according to claim 19 wherein said particulate matter stabilizer is a surfactant comprising a hydrocarbon.

22. The process according to claim 19 wherein said metal salt comprises nickel.

23. The process according to claim 19 wherein said reducing agent is sodium hypophosphite.

24. The process according to claim 19 wherein said electroless metallizing bath further comprises ammonium ions.

25. The process according to claim 19 wherein said particulate matter comprises wear resistant particles.

26. The process according to claim 19 wherein said particulate matter comprises lubricating particles.

27. The process according to claim 19 wherein said particulate matter is a fluoride derivative.

28. The process of electrolessly metallizing a body to provide on the surface thereof a metal coating incorporating therein insoluble particulate matter which comprises contacting the surface of said body with an electroless metallizing bath comprising an aqueous solution of the metal salt, a reducing agent, a quantity of particulate matter, and a quantity of a cationic particulate matter stabilizer wherein said particulate matter stabilizer shifts the Zeta potential for said insoluble particulate matter by at least 10 mv in comparison to the measured Zeta potential of said insoluble particulate matter alone in water.

29. The process according to claim 28 wherein said particulate matter stabilizer is a surfactant comprising a fluorocarbon compound.

30. The process according to claim 28 wherein said particulate matter stabilizer is a surfactant comprising a hydrocarbon.

31. The process according to claim 30 wherein said metal salt comprises nickel.

32. The process according to claim 30 wherein said reducing agent is sodium hypophosphite.

33. The process according to claim 30 wherein said electroless metallizing bath further comprises ammonium ions.

34. The process according to claim 30 wherein said particulate matter comprises wear resistant particles.

35. The process according to claim 30 wherein said particulate matter comprises lubricating particles.

36. The process according to claim 35 wherein said wear resistant particulate matter comprises silicon carbide.

37. The process according to claim 35 wherein said wear resistant particulate matter comprises diamond.

38. The process according to claim 35 wherein said particulate matter stabilizer comprises an anionic compound.

39. The process according to claim 35 wherein said particulate matter stabilizer comprises a non-ionic compound.

40. The process according to claim 28 wherein said particulate matter is a fluoride derivative.

41. A process for electrolessly metallizing a body to provide on the surface thereof a metal coating incorporating finely divided wear resistant particulate matter which comprises contacting the surface of said body with an electroless metallizing bath comprising an aqueous solution of a metal salt, an electroless reducing agent, a quantity of finely divided insoluble wear resistant particulate matter, and a quantity of particulate matter stabilizer, said particulate matter stabilizer being capable of shifting the Zeta potential for said insoluble wear resistant particulate matter towards negative Zeta potential values in comparison to the measured Zeta potential of said insoluble wear resistant particulate matter alone in water.

42. The process according to claim 41 wherein said particulate matter is a fluoride derivative.

43. A process for composite electrolessly metallizing a body to provide on the surface thereof a metal coating which comprises contacting the surface of said body with an electroless metallizing bath comprising ammonium ions, insoluble particulate matter dispersed therein and a quantity of particulate matter stabilizer, and wherein said particulate matter stabilizer is an admixture of a nonionic compound along with a member selected from the group consisting of anionics, cationics, and amphoterics, and mixtures thereof.

44. The process according to claim 43 wherein said particulate matter is a fluoride derivative.