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Superlow friction of lubricated by glycerol: An electron energy loss spectroscopy study
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10.1063/1.2779256
/content/aip/journal/jap/102/6/10.1063/1.2779256
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/6/10.1063/1.2779256

Figures

Image of FIG. 1.
FIG. 1.

(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).

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

TEM picture of coating showing that it is in fact composed of four parts.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

Friction coefficients of (a) a steel/steel couple (black), (b) an couple (gray), and (c) a couple (dark gray) lubricated by pure glycerol.

Image of FIG. 7.
FIG. 7.

Optical image of flat wear scar of (a) steel, (b) , and (c) (tribofilm, see dashed line).

Image of FIG. 8.
FIG. 8.

(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.

Image of FIG. 9.
FIG. 9.

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).

Image of FIG. 10.
FIG. 10.

SEM images of the coating after friction testing obtained by using a SE detector. These images give a topographic contrast.

Image of FIG. 11.
FIG. 11.

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.

Image of FIG. 12.
FIG. 12.

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.

Tables

Generic image for table
Table I.

Characteristics of the two DLC coatings analyzed (hardness was determined by nanoindentation measurement).

Generic image for table
Table II.

Energy of the low-loss peak for the four stratas of the coating and the corresponding calculated hardness from Eq. (1).

Generic image for table
Table III.

Energy of the low-loss peak of the nine spectra from Fig. 9 and their corresponding calculated hardness from Eq. (1).

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/content/aip/journal/jap/102/6/10.1063/1.2779256
2007-09-27
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Superlow friction of ta-C lubricated by glycerol: An electron energy loss spectroscopy study
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/6/10.1063/1.2779256
10.1063/1.2779256
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