WMV

Reibverschleiss und Reibungsreduktion


Sliding parts with high
galling and seizing risk



Lunac 2+ applied to heavily loaded sliding machine parts



Originally Lunac 2+ was developed for this specific task by means of modified high technical ceramic content and special minimal sliding face matrix, to obtain a reduced coefficient of friction and superb anti-galling properties. This resulted in a very low adhesive wear characteristic (see the adhesive wear diagram), in combination with lowered friction in many systems (see the coefficient of friction diagram) Lunac 2+ on ditto coated faces offers one of the best tribological improvements to parts that are normally nitrided. Not
only sliding parts which encounter adhesive as well as abrasive wear, but also slightly moving/vibrating parts that suffer from tribo-oxidation and fretting will behave as massive ceramic parts in the case they are coated with semi-ceramic Lunac 2+. The major advantages are the different and easier (cost saving) manufacturing procedures and the presence of ductile metals below the coating. Fairly often, machine concepts that cannot or hardly be lubricated become feasible because of Lunac 2+ coatings.





valve with galling problems




The interior of this stainless steel cylinder valve (food dosing installation) has been coated with Lunac 2+ to protect this stainless steel outer part from galling and fretting and reduce the minimal allowable clearance (< 0.025 mm / 1 mil). Lunac 2+ can even be applied to small internal structures (+/- Ø 4 mm, length dependant).











screen changer with galling problems
Besides Lunac 1 non stick coatings applied to the conveying canals of displayed screen changers, thick Lunac 2+ coatings (80 µm / 3 mil) are reliably applied to the mechanical (and/or corrosive) heavily loaded piston- and bore surfaces. This coating thickness proved to ban egg scale effects. A nitrided steel surface (e.g. DIN 1.8519 or 1.8550) normally develops scratches after a while, frequently followed by galling. A side effect of the Lunac 2+ non stick effect is that scales of hard thermally cracked plastic remnants will hardly build up between the piston and cylinder.










Picture:
Kreyenborg
Germany