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|Title:||WC–ZrO2 composites: processing and unlubricated tribological properties|
|Citation:||Wear, Vol 260, Iss 1-2, Page 1-9|
|Abstract:||In the present work, we report the processing and properties of WC–6 wt.% ZrO2 composites, densified using the pressureless sintering route. The densification of the WC–ZrO2 composites was carried out in the temperature range of 1500–1700 °C with varying time (1–3 h) in vacuum. The experimental results indicate that significantly high hardness of 22–23 GPa and moderate fracture toughness of 5 MPa m1/2 can be obtained with 2 mol% Y-stabilized ZrO2 sinter-additive, sintered at 1600 °C for 3 h. Furthermore, the friction and wear behavior of optimized WC–ZrO2 composite is investigated on a fretting mode I wear tester. The tribological results reveal that a moderate coefficient of friction in the range from 0.15 to 0.5 can be achieved with the optimised composite. An important observation is that a transition in friction and wear with load is noted. The dominant mechanisms of material removal appear to be tribochemical wear and spalling of tribolayer.|
|Description:||Copyright for the article belongs to Elsevier Science Ltd http://dx.doi.org/10.1016/j.wear.2004.11.005|
|Appears in Collections:||Journal Articles|
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