A combination of chemical nickel and silicon carbide to achieve surfaces of extraordinary hardness: the ultimate answer to problems of wear due to fretting contact.
In the CHENISIL treatment, 20-30% of silicon carbide particles are evenly dispersed in a chemical nickel matrix. The extreme hardness of the particles leads to the final result of a surface covered with a uniform, non-porous coating which shows excellent resistance to abrasive wear. In addition to this, the basic features of the treatment typical of electroless nickel plating provide excellent corrosion strength and high uniformity of the coating on any geometry.
Maximum performance can also be achieved by appropriately choosing the actual thickness of the coating as well as the heat treatment that will characterise the final hardness values.
All the customer has to do is explain to us the technical and functional requirements of the component, after which the most appropriate choice can be determined with the support and assistance of ARGOS technicians.
Magnetic sensitivity and Conductivity
CHENISIL coating allows us to maintain a uniform thickness on pieces of any shape, even with highly complex geometries, eliminating the need for expensive mechanical finishing.
This provides excellent protection of internal areas, such as holes or cavities, and a total respect for the basic roughness.
Also, thanks to the good adhesion to the substrate, the CHENISIL coating does not tend to flake off even when highly stressed and where it sustains mechanical damage, unlike galvanic deposits (such as chromium), and does not allow corrosion or delamination phenomena, even in case of microporous materials, unless it depends on the material characteristics (aluminium, for example).
Although showing a slight surface roughness due to the presence of the silicon carbide particles, the surface of parts coated with the CHENISIL process does not jeopardise performance in terms of fretting since CHENISIL itself however has an excellent coefficient of friction. Above all, the hardness of the surface prevents its formation of debris that may generate friction between the elements in contact.
The metallographic section of CHENISIL composite coating, evidences the regular distribution of the particles in the nickel alloy matrix.
The matrix structure of chemical nickel makes the pieces treated extremely corrosion and wear resistant, reaching levels of several ceramic coatings which, due to their nature and properties, are by and large deposited in very thin layers and do not protect against corrosion.
CHENISIL also has excellent resistance to very high thermal shocks as well.
The already high hardness of the CHENISIL coating can be further increased with heat treatments at high temperature (between 180 and 380°C).
This allows the coating to harden up to values of around 1400 HV.
These values are much higher than those of hard chrome, and are easily comparable to many plasma coatings.
Compared to the latter, CHENISIL ensures far superior corrosion strength
The metallographic section proves the high closeness of the coating to the original shape of the substrate, which can be achieved by CHENISIL process.
TABER WEAR INDEX
2,6 – 3,9
The material is non-magnetic, and exhibits slight magnetic characteristics only after heat treatment. The material has good thermal conductivity and moderate electrical conductivity.
Food: sleeves, rods, valve bodies and miscellaneous taps, drink and beer dispensing systems, extruders, boilers, pipes, spouts, heat exchangers for coffee machines, mouths and augers for meat grinders, rotors and valves for dispensing powder and flour, pinions and parts for fruit and vegetable washing and sorting systems. Pharmaceutical: sheets, folders, strips, sealing bars, metering units for filling machines (solids/liquids/creams), cartoning machines, thermoforming machines, blistering machines, capsuling machines.
Automotive: cores and rods for injector bodies of LPG/methane sector, pins and linkages for windshield wipers, injectors, cylinder heads, cylinders, pistons. Motorcycles: pulleys, fixed and mobile clutch/hub bell housings, shock absorbers for motorcycles and quadricycles.
Components for relays, automatic cut-out switches, shafts, drive shafts, pins.
HYDRAULIC AND PNEUMATIC
Crane/lift truck journals, valve/piston bodies and stems for hand pumps, gears, pistons, cylinders.
PETROCHEMICAL, OIL & GAS, NUCLEAR
Balls, bodies, stems, spacers, seats.
MOULDS FOR PLASTIC / GLASS
Inner bodies, outer bodies, layers.
Pliers and thread guides, washers, pulleys, sliding surfaces, taping machines for fabric processing, shells, plates, sinker rings, covers.
Notes: to prevent leakage of impurities from the assembly area, nickel plating of assembled parts is not recommended. Some alloys and materials are also incompatible with the treatment. The parts must be supplied free of impurities and oily residue. If necessary, they can be subjected to preparation operations such as guards or masking, and also micro-sandblasting, micro-shot-peening, ultrasonic cleaning even for large sizes and other similar processes. It is advisable to talk to ARGOS technicians for any details, questions or advice regarding the operations described above.
The electroless nickel plating process that produces a coating highly resistant to corrosion and wear and that is uniform on any geometry.
Chemical nickel and Teflon together for a self-lubricated surface: maximum smoothness with exceptional lifetime.
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