Matériaux & Techniques
Volume 79, Number 12, 1991
|Page(s)||45 - 48|
|Published online||13 April 2017|
Frottement à haute température de revêtements d’oxyde de chrome avec ou sans lubrifiant solide
Friction at high temperature of chromiun oxide with or without solid lubricant
1 I.S.M.C.M., St Ouen
2 Renault, Rueil
Sliding friction of chromium oxide (Cr2O3) against chromium oxide + solid Lubricants (CaF2 and BaF2) has been studied at 425° C under different contact pressures. Cr2O3 sliding against itself has always presented the following features : irregularities of the friction curve (slip-stick) ; important variations of the coefficients with contact pressure ; visible damage of the sliding surface. Adding a solid lubricant to Cr2O3 coatings has improved their tribological properties : more regular friction curves ; lower and stable friction coefficients ; prevention of the surface damage ; reduction of the wear rates by 40 to 100 times and higher critical contact pressure. Microscopic observation and analysis show that the improvement of tribological properties results from the presence of a solid lubricant film. Consequently, strong adhesion (in some contact areas) between Cr2O3 / Cr2O3 is prevented. The introduction of a solid lubricant decreases surface energy and improves the shearing behaviour of the ceramic coating.
© SIRPE 1991
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