PyC Coating and PyC Infiltration
Chemical vapor deposition (CVD) is a versatile process for the manufacturing of coatings.
Basically, this process is a chemical reaction between a substrate material and vapor phase precursors.
Our PyC coatings are based on Thermal CVD, where the deposition process is promoted by heat. CVD enables a deposition of homogeneous layers from some nm up to some micrometer on the surface of a broad range of substrates (shape or materials).
However, some applications such as the reinforcement of CFC or insulation grades need to deposit the PyC coating inside the pores of the material without closing them. For these applications, NKCG offers the possibility to perform chemical vapor infiltration (CVI).
Find out more about all the benefits.
CVI is a type of CVD in which the reactive gas infiltrates the porous material that must be covered. It allows the deposition in the depth of the structure. This will densify the structure of the material. The chemistry and thermodynamics for CVD and CVI and essentially the same, only kinetics is different.
Why having a PyC layer on Graphite or CFC?
PyC coated components become highly stable against oxidation and chemical wear. Furthermore, the surface is kind of “sealed” and this prevents particle emission. In addition to the PyC CVI/CVD process all parts can be purified as well (<5/20ppm).
Main Advantages of a PyC Layer on Graphite:
Increases surface density
Almost any shape and graphite type can be used
Oxidation protection, useful up to 750°C in air
Very low particle emission and release
Reduction of open porosity, almost gas tight
Excellent electrical and thermal conductivity in coating plane
All parts can be purified