Impact Resistant Coating
The Hardide coating is deposited uniformly and as a crack-free coating that is tough and ductile and which can survive impact and shock loads.
In many cases the coating matches the impact resistance of metal and, under impact, will deform with the substrate and won’t chip or flake. It doesn’t crack until the substrate reaches its yield point, and even then the coating remains bonded to the surface. Brittleness and poor impact resistance are among the characteristics of traditional WC/Co hardmetals. HVOF WC/Co coatings are known to crack and spall under high load and high cyclic fatigue conditions. These drawbacks restrict the use of cemented carbides and spray coatings on tools and wear parts operating in conditions where shock loads and impact may cause fracture and catastrophic failure.
The images below illustrate the coating’s ability to survive impact as well as significant substrate deformations and shock loads without spalling or cracking. The coated parts retain integrity and can continue operating under harsh conditions.
Micro-photographs of a 1 mm diameter indentation (left) and the scratch test (right) of 50 microns thick Hardide-T coating on steel. The absence of cracking, chipping or spalling demonstrates Hardide coatin’s unique toughness and flexibility.
4140 steel test ring with Hardide coating
After 24 hours immersion in 28% uninhibited HCl (left).
A steel test ring with 50 microns of Hardide coating was crushed to test coating adhesion and toughness. The test ring showed no flaking or coating separation from the substrate (right).
Hardide coating sections from the crushed 4140 steel test ring. Coating cracked where the substrate cracked at the crushed end of the ring (left) but retained integrity at the flat side (right) despite significant deformations.