In principle, it is possible to coat all types of metals with all types of metals and carbides using the HVOF process – e.g. tungsten carbides, stainless steel, copper, aluminium, etc. – but the process is particularly well-suited to carbide coatings.
The possibilities are endless and include a specially developed coating approved for drinking water applications.
Owing to the inherent advantages in the process, HVOF coatings can be applied in thicknesses varying from 0.05 - 2.0 mm.
Typical thicknesses lie in the range 0.05 – 1.0 mm.
The sketch to the left illustrates a cross-section of a thermal spray coating.
The reason for the often significantly extended lifetime can be found in the coating’s very high carbide content of up to 90%. Wolfram carbide has a hardness of approx. 2200 HV5 – typical wear particles such as quartz/sand have a hardness of approx. 12-1500 HV5.
In comparison, the hardness resulting from various heat treatments (hardening) typically lies in the range 700–800 HV5, which means that the wear resistance is considerably lower.