Abstract
The wear mechanisms of the ZrO2 (3 mol.% Y2O3) (3Y-TZP) ceramics/GCr15 steel reciprocating sliding couple under water lubrication were investigated. Wide ranges of normal loads and sliding speeds were chosen in order to study the relationship between the tribological performance of this sliding couple and the testing conditions. Different wear regions were identified as a function of normal load and speed. The wear surfaces were carefully examined by scanning electron microscopy. The mild and severe wear of 3Y-TZP ceramics are related to plastic deformation and surface fracture, respectively. The mild and severe wear of GCr15 steel is related to plastic deformation and abrasive wear, respectively. At very high normal load and low sliding speed, 3Y-TZP ceramics take negative wear due to steel transfer caused by the strong adherence between 3Y-TZP ceramics and GCr15 steel. The wear mechanicms of 3Y-TZP ceramics and GCr15 steel at different sliding conditions are summarized by their wear mechanism transition diagrams.
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