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NP3Electroless Nickel / PTFE Composite
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NP3 Coatings are a True Composite Coating of Electroless Nickel, Phosphorous and PTFE (Teflon).
The PTFE is evenly distributed throughout and locked into the nickel phosphorus matrix creating a true and stable composite. As wear occurs fresh particles of PTFE are exposed to keeo the surface lubricated. This lubrication is available as long as the integrity of the coating is intact.
With NP3, the innovativeengineer can specify surface characteristics that were previously thought unattainable.
The autocatalytic nickel matrix provides an ideal supporting medium for the approximately 25 volume percent of rather soft submicron particles of PTFE. As the composite surface is slowly worn away during operation, more PTFE rich coating is exposed to the wearing surface, providing a continuous supply of solid lubricant to the critical areas. Heat treatment is possible to increase the matrix nickel-phosphorus hardness.
Substantial improvements in performance have been noted in components coated with the composite. In some cases the introduction of the composite has made previously impossible processes viable.
Why Choose NP3?
- Increases Reliability
- Requires little to no oil for lubrication
- Very accurate and even coatings on all activated surfaces
- Easy to clean
- NP3 has a micro hardness of 48-51 Rockwell as plated (nickel matrix).
- NP3 is very corrosion resistant, a 1 mil (.001) coating exceeding a 250 hour salt spray test.
- NP3 has a high lubricity and low friction co-efficient; the life expectancy of parts will be greatly increased due to reduced friction wear.
- NP3 is guaranteed against corrosion, peeling and flaking.
A BRIEF HISTORY
The Electroless Nickel / PTFE process was developed in Holland and later refined and commercialized in England. Coating Technologies, Inc. became a licensed facility in the United States for this process in 1987. In 1988 CTI hired one of the developers of this process ( Dr. Paul Ebdon PHD ) to help train and develop the market for this new technology.
This relationship has made CTI the undisputed leader in the Electroless Nickel/PTFE composite market today.
A UNIQUE CONCEPT IN COATING TECHNOLOGY
NP3 is a surface treatment for various metals and alloys that combines sub-micron particles of PTFE (Polytetrafluoroethylene) with autocatalytically applied nickel/phosphorus. The result is an accurately applied, dry lubricated, low friction surface that is extremely hard and resistant to wear.
The PTFE is evenly distributed throughout and locked into the nickel phosphorus matrix creating a true and stable composite. As wear occurs fresh particles of PTFE are exposed to keep the surface lubricated. This lubrication is available as long as the integrity of the coating is intact.
With NP3, the innovative engineer can specify surface characteristics that were previously thought unattainable.
The uniform thickness and dimensional accuracy of NP3 negates the need for post-plate grinding operations. Thinner, accurate coatings mean reduced cost in materials and handling. Coatings can be applied to very exact tolerances easing the design and processing problems for engineers and designers.
Processing of the NP3 can be done expeditiously on most parts thus allowing for quicker assembly or replacement of time sensitive components.
Components plated in NP3 that have shown wear can be chemically stripped and replated with a fresh coating of NP3, thereby saving on component replacement costs. Importantly, NP3 is competitively priced.
THE NP3 / ELECTROLESS NICKEL PROCESS
The NP3 process is an evolution of autocatalytic (Electroless) nickel plating. Electroless Nickel is a time proven technology that accurately deposits hard, corrosion resistant nickel phosphorus onto metal. One of the greatest attributes of this technology is no matter how complex the shape, the coating thickness remains consistent. This type of accuracy is not possible with conventional electrolytic plating.
Plating is accomplished by using reducing agents in the bath. Sodium hypophosphate fuels the reduction reaction to deposit the nickel along with the codeposition of small amounts of phosphorus. The phosphorus enhances the nickel’s corrosion resistance by forming a thin tarnish film and gives a deposited hardness ranging from Rc 35-50. Heat treatment can increase hardnesses into the Rc 68-70 range.
With NP3, PTFE is introduced into the solution with a blend of surfactants and other chemicals which enable the PTFE to be codeposited with the nickel. This composition incorporates approximately 25 volume percent of PTFE into the nickel matrix. Unlike other nickel /PTFE products, NP3 is a true composite.
NP3 (ELECTROLESS NICKEL/PTFE) AEROSPACE SPECIFICATIONS
The plating of components with electroless or autocatalytic nickel is one of the most rapidly developing metal finishing processes. The advantages of coating uniformity, corrosion resistance and hardness are providing designers with opportunities to protect and improve base materials in ways that were not previously possible.
GPS3117-1 (Honeywell), HP4-90 (Boeing), M7019883 (Honeywell), EMS52545 (Allied Engines)
In addition to the benefits mentioned above, the autocatalytic nickel coating confers a degree of lubricity on the component, enhancing the coating’s suitability for pumps, compressors, pistons, brake cylinders and hydraulic components. The precise uniformity of the deposit enables the coating to be utilized as a true finishing process, with no post plate grinding or polishing required after plating.