(a) EFTEM image at 30 eV of coating. The coating is 728 nm thick and an interlayer of 32 nm is present between the main coating and the iron substrate. A Pt protective coating (25 nm) was deposited on the DLC coating before cutting. (b) Energy-filtered image at 6 eV of the top of the coating. A graphitic layer 2 nm thick can be observed at the extreme surface (just below the Pt coating which was only 7 nm thick on this area).
EDS analysis (line scan) on the entire coating (from the substrate to the resin coating deposited on the Pt layer). Profiles of carbon, iron, and chromium elements along the line scan.
EFTEM image at 30 eV with reconstructed spectra of a set of images between 11 and 66 eV on six positions indicated in the picture (position 1: interlayer; position 2–5: main coating). A corresponding scale of hardness calculated with the relation of Howe et al. is mentioned below the picture.
TEM picture of coating showing that it is in fact composed of four parts.
EFTEM image with reconstructed spectra of a set of images between 11 and 33 eV on four positions indicated in the picture corresponding to the four parts of the coating. A corresponding scale of hardness calculated with the relation of Howe et al. is mentioned below the picture.
Friction coefficients of (a) a steel/steel couple (black), (b) an couple (gray), and (c) a couple (dark gray) lubricated by pure glycerol.
Optical image of flat wear scar of (a) steel, (b) , and (c) (tribofilm, see dashed line).
(a) EFTEM image at 30 eV of coating after friction test. The coating is 655 nm thick and the interlayer of 30 nm is also present. (b) A kind of tree structure can be observed inside the coating.
EFTEM image at 30 eV with reconstructed spectra of a set of images between 13 and 40 eV on nine positions indicated in the picture (position 1–8: main coating, position 9: interlayer).
SEM images of the coating after friction testing obtained by using a SE detector. These images give a topographic contrast.
Dark field image performed with the diaphragm positioned on the (002) ring. This image shows the graphitic nature of the tree-like structures and the presence of a well defined layer at the top of the coating.
Overlay of an ESI image of oxygen (529 eV) in yellow on a zero-loss image of the coating. These results prove a hydroxylation of the coating during friction testing.
Characteristics of the two DLC coatings analyzed (hardness was determined by nanoindentation measurement).
Energy of the low-loss peak for the four stratas of the coating and the corresponding calculated hardness from Eq. (1).
Energy of the low-loss peak of the nine spectra from Fig. 9 and their corresponding calculated hardness from Eq. (1).
Article metrics loading...
Full text loading...