Impact of Wire-EDM on Tribological Characteristics of ZrO2-based Composites in Dry Sliding Contact with WC–Co-Cemented Carbide
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The effect of surface conditions and secondary phase addition on the dry sliding friction and wear characteristics of five yttria-stabilized ZrO2-based composites with 40 vol% WC, TiCN or TiN was investigated using an ASTM G133 pin-on-flat sliding contact configuration. WC–6wt%Co-cemented carbide pins were used as mating material. The friction and wear level were higher for wire-EDMed ZrO2-based composites compared to their equivalent ground specimens. This finding could be correlated to flexural strength measurements, revealing strong discrepancy between wire-EDMed and ground surfaces. The most favorable tribological characteristics were encountered with ZrO2–WC composites compared to ZrO2–TiCN and ZrO2–TiN grades.
KeywordsZrO2-based ceramic composite Wire-EDM Unlubricated friction Wear mechanism Flexural strength
This investigation was supported by the Flemish Institute for the promotion of Innovation by Science and Technology in industry (IWT, Grant No. GBOU-IWT-010071-SPARK) and by the Fund for Scientific Research Flanders (FWO, Grant No. G.0539.08). Research was performed under a cooperative effort between Ghent University (UGent) and Catholic University of Leuven (K.U. Leuven). The authors are grateful to the participating research partners for all their assistance, facilities, scientific contributions, and stimulating collaboration. They also wish to extend their sincere gratitude to CERATIZIT for supplying the cemented carbide pins.
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