Nothing New Under the Sun?

[10Ring]

"To prevent, or reduce the tendency of, clay particles and larger, agglomerated masses thereof from sticking to the body or other features of a drill bit, the bit or selected portions thereof may be treated by coating with a codeposited layer of electroless nickel and polytetrafluoroethylene (offered under the trade name Teflon.RTM.). Such materials are commercially available from different vendors under a variety of trade names, including NYE-TEF, Enlon, Niflor, Niklon, and others. Such materials have been used commercially to coat dies, screws and mold interiors (eliminating the need for a mold release spray), but to the inventors' knowledge have not been used as proposed herein. Combined with local electro-polishing or other mechanically smoothing techniques of the subject surfaces before or after plating with the materials, an extremely smooth and slick surface exhibiting a coefficient of sliding friction of less than 0.1 may be created. In this type of coating, micron-sized polytetrafluoroethylene particles are embedded and dispersed (for example, 22-25% by volume) throughout the hard nickel coating. As wear or erosion of the nickel takes place, more polytetrafluoroethylene is exposed. Coating thickness may be, by way of example only, from about 7 microns to about 0.005 inch." Patent 6450271

"NP3 is a surface treatment for steel and metal alloys that combines sub-micron particles of PTFE (polytetrafluoroethylene), otherwise known as Teflon, with electroless nickel...If wear occurs, fresh particles of PTFE are exposed to keep the opposing surfaces lubricated throughout the life of the coating." Robar

Robar also incorporates phophsorus.