What are the physical properties after recoating?
Unlike hot-processed CVD coatings, which combine with carbon molecules from the substrate to form a hard layer, FortiPhy CrN is a chemically complete coating, applied to a surface using a special high-adhesion process. Typical CVD coatings are applied above 1800°F in order to increase diffusional activity within the substrate. During the CVD coating process, carbon atoms move to the surface and combine with the coating material to form a third compound. This can produce a hard coating, but there are drawbacks: only some of the substrate’s carbon is available to migrate to the surface, and it can only travel a short distance. This means that as tools and coatings wear, the second application of a CVD coating usually lasts about 70 percent as long as the first application. A third application generally has a life of only 30 percent of the original tool. The free carbon molecules are all “used up” after that. When no more carbon can be leached to the surface, the process ceases to provide
