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This work assesses the suitability of TiCN-WC-Co-Cr3C2 cermet modified by TiN for cutting tool application. Three cermet compositions containing TiN with 5, 10 and 15 wt% were prepared by Spark Plasma Sintering (SPS). The prepared cermets were subjected to pin-on-disk wear testing using EN31 steel as a disc material. The wear testing was conducted at a constant load of 20 N with different sliding velocities: 0.23 m/s, 0.27 m/s, and 0.35 m/s, which corresponds to 150 rpm, 175 rpm, and 225 rpm respectively. The cermet composition 55TiCN-15WC-10Co-5Cr3C2–10TiN (all in wt%) has shown lowest mass loss during wear testing. The thermal stability of the cermets were assessed by conducting annealing studies on the prepared cermets at different temperatures: 600°, 800° and 1000 °C for a constant soaking time of 4 h. The prepared cermets had very good thermal stability up to 800 °C. Beyond this temperature, a drastic reduction in the hardness of the cermets was observed. Among the three cermet compositions, 60TiCN-15WC-10Co-5Cr3C2–10 TiN showed better thermal stability. The oxide phases formed in all the cermet compositions during annealing at high temperatures (1000 °C) retard their microstructures. As a result, the hardness was decreased. |
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