Some remarks concerning scuffing of ceramics slid against steel

Eugeniusz Kwaśniak , J. Pasierski , J. Stupnicki

Abstract

Scuffing of Cr2C3 ceramic coatings applied on steel surfaces, ground or polished, was investigated after sliding against a hard steel surface. Results in the form of diagrams for samples having different surface parameters are compared with one another and with those obtained by using the same apparatus for scuffing of steel/steel pairs. The contact loads were increased monotonously. Sliding velocity was constant at Vh = 12 m s−1 until the scuffing caused the apparatus to come to a dead stop. The contact was lubricated with a gear lubricant Hipol EP-4 80W/90. The scuffing phenomena observed for steel/ceramic differ significantly from those observed for steel/steel pairs. The simple mechanism of scuffing observed for steel/steel contacts is replaced by a much more complicated process, beginning with a slow increase of traction forces, then transient scuffing phenomena occurred accompanied by dynamic incidents similar to stick-slip phenomena. Catastrophic destruction of the ceramic coatings, the result of the creation of inter-granular cracks when the Cr2C3 grains are pulled out from the surfaces with extraction of large aggregates of Cr2C3 grains as a result of the low fracture toughness of ceramics, was observed. Delamination of the ceramic coating from the substrate due to thermal stresses was also noticed.
Author Eugeniusz Kwaśniak (FPAE / IAAM)
Eugeniusz Kwaśniak,,
- The Institute of Aeronautics and Applied Mechanics
, J. Pasierski
J. Pasierski,,
-
, J. Stupnicki
J. Stupnicki,,
-
Journal seriesWear, ISSN 0043-1648
Issue year1997
Vol209
No1–2
Pages219-228
Keywords in EnglishCeramic coatings, Scuffing
DOIDOI:10.1016/S0043-1648(97)00033-1
URL http://www.sciencedirect.com/science/article/pii/S0043164897000331
Score (nominal)40
Publication indicators WoS Impact Factor: 2006 = 1.18 (2) - 2007=1.873 (5)
Citation count*6 (2015-05-15)
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