Process for co-deposition with electroless nickel

• US 6,156,390 A
• Filed: 04/01/1998
• Issued: 12/05/2000
• Est. Priority Date: 04/01/1998
• Status: Expired due to Term

• Current Assignee: Wear-Cote International, Inc.
• Original Assignee: Wear-Cote International, Inc.
• Inventors: Henry, James R., Henry, Mark W.
• Primary Examiner(s): Beck, Shrive
• Assistant Examiner(s): BARR, MICHAEL E
• Application Number:
  US09/053,674
• Time in Patent Office: 979 Days
• Field of Search: 427/437, 427/438, 427/436, 427/122, 427/443.1, 427/443.2
• US Class Current: 427/438
• CPC Class Codes: C23C 18/1662 Use of incorporated material in the solution or dispersion, e.g. particles, whiskers, wires
• CPC Class Codes: C23C 18/34 using reducing agents

Abstract

A process for the co-deposition of fluorinated carbon and diamond material with electroless metal in which the electroless plating bath is formulated to contain an aqueous dispersion of the fluorinated carbon, the finely divided diamond material and an electroless metal salt in aqueous suspension. the plating bath can be used to plate workpieces wherein the fluorinated carbon and diamond material are co-deposited in a plated electroless metal matrix. It has been found that the use of a finely divided diamond material having an average diameter less than 10 nm provides not only improved bath stability but also facilitates the codeposition of the diamond material and fluorinated carbon with the electroless metal.

Claims

1. A process for the co-deposition of fluorinated carbon and diamond material with electroless metal comprising the steps of:

(a) introducing a workpiece into a plating bath containing a metal salt serving as a source of electroless metal for plating, a fluorinated carbon, finely divided diamond material having an average particle size less than 10 nm wherein the finely divided diamond material is prepared by the detonation of a carbon-containing substance with a negative balance in a closed volume in an atmosphere inert to carbon and a surfactant combination comprising a non-ionic wetting agent and a cationic wetting agent, and

(b) initiating an electroless plating process to form a plated workpiece including co-deposit of fluorinated carbon and diamond material substantially uniformly dispersed in a plated metal matrix.

2. A process as defined in claim 1 wherein the electroless metal is electroless nickel.

3. A process as defined in claim 1 wherein the diamond-containing material is in the form of synthetic diamonds having round or irregular shapes with an average diameter within the range of 1 to 5 nm.

4. A process as defined in claim 3 where the diamond-containing material has a surface area less than 325 m² /g.

5. A process as defined in claim 1 wherein the bath includes a chemical reducing agent.

6. A process as defined in claim 1 wherein the electroless metal salt in the bath has a concentration within the range of 20 to 50 g/L.

7. A process as defined in claim 1 wherein the bath contains fluorinated carbon in a concentration of 5 to 50 g/L.

8. A process as defined in claim 1 wherein the diamond-containing material in the bath has a concentration of about 0.1 to 10 g/L.