Chemical-cold coating on Epoxy with the precision of > 200nm

The Chemical-Cold gas dynamic spray, or CCS-coating, is a relatively new coating process in which coatings of ductile materials can be produced without significant heating of the sprayed powders [1]. The kinetic energy of the impinging particles is sufficient to produce considerable epoxy deformation and high interfacial pressures and temperatures, which appear to produce a solid state bond. The particle kinetic energy at impact is significantly lower than the energy required to melt the particle suggesting that the deposition mechanism is primarily, or perhaps entirely, a solid state process. Therefore, this method is regarded as solid state coating process although impact induced surface melting of the coated substrate may be possible. The most important parameter for cold spray process is its critical particle velocity prior to impact on substrate (2,3). For a given material and substrate (as epoxy seems here), there exists a specific critical particle velocity. The particle with a velocity lower than the critical velocity will lead to the erosion of the substrate. Only the particles reached to a velocity larger than the critical velocity can be deposited to produce the coating. The critical velocity may be influenced by the size and size distribution of the particles as well as particle and substrate material properties. The chemical band of the Quasi-liquid substrate of composite Epoxy has coated by chemical materials that has perfect reflection and the precision of this method is not very high (<200nm), but the main usage of this method is its efficiency using to coat all kinds of Quasi-liquid, solid and solid materials that other methods don’t have this efficiency.