Anti-Galling coatings
Hardide anti-galling coatings are proven to provide superior galling resistance under high load and high velocity dry sliding contact conditions.
Under abrasion testing ASTM G65, the Hardide-T coating is:
Galling after TE77 industry test
Resists galling at test max contact pressure
More wear resistant than HVOF WC-83%/Co-17%
better than Hard Chrome Plating
The self-mated Hardide coatings showed the best anti-galling performance out of all tested combinations. It did not gall even under the maximum contact pressure of 810 MPa in dry metal/metal wear conditions, maintaining a dry dynamic coefficient of friction ~ 0.2.
This unusual anti-galling performance enables extremely durable mechanical assemblies where the mating parts are not only protected against galling, but also against abrasive wear, corrosion and other factors.
By using a Hardide anti-galling coating on one of the mating components, galling can be reduced. This is because the two mating surfaces have dissimilar compositions and properties will reduce the adhesive surface forces. Hardide coatings are composed of tungsten (the most refractory metal with a melting temperature of 3410°C – the highest among all metals) and tungsten carbide (a refractory ceramic) which are less likely to ‘weld’.
In addition to their anti-galling properties, Hardide anti-galling coatings also provide superior wear and corrosion resistance. This combination is important for applications where the risk of galling is combined with abrasive or corrosive media, as these factors can have a synergetic effect which accelerates surface damage.
