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1 2005

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Characterization of microstructure of Cr/CrN/Cr/Cr(N,C) coating deposited with pulsed laser deposition (PLD) technique.

Morgiel J., Major L., Takahashi H., Shibayama T., Foord D., Lackner J.M.

Archives of Materials Science

2005

Vol. 26, nr 1-2

111-117

The Cr/CrN/Cr/Cr(N,C) coating on stainless steel substrate was obtained using Pulse Laser Deposition (PLD). The transmission electron microscopy (TEM) observations showed that the coating consist of four main layers of 225/341/75/416 nm, of which the first one is divided into three sub-layers. The second and fourth layer were built of columnar grains, while all the others showed an amorphous like contrast. Local chemical analysis performed using X-ray energy dispersive spectroscopy system (EDS) confirmed a high content of nitrogen and carbon in CrN and Cr(N,C) respectively and pointed toward a raised level of oxygen in all layers. These measurements also indicated the existence of strong Cr gradient in the buffer layer. The atomic resolution observations (HREM) helped to assess the maximum size of columnar grains below 20 nm. The same type of observations performed on Cr buffer and the intermediate layer proved to contain Cr nano-crystallites. Additionally, the density of nano-crystallites was found to change in between buffer sub-layers.