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Title: Pressureless sintering and tribological properties of WC–ZrO2 composites
Authors: Basu, B
Venkateswaran, T
Sarkar, D
Keywords: Sintering
Tribochemical wear
WC; ZrO9(sub)2
Issue Date: 2005
Publisher: Elsevier
Citation: Journal of the European Ceramic Society, Vol 25, Iss 9, P 1603-1610
Abstract: In a recent work [Basu, B., Lee, J. H. and Kim, D. Y., Development of WC-ZrO2 nanocomposites by spark plasma sintering. J. Am. Ceram. Soc. 2004 87(2), 317–319], the processing of ultrahard WC–ZrO2 nanocomposites using spark plasma sintering is reported. In the present work, we investigate the processing and properties of WC–6 wt.% ZrO2 composites, densified by pressureless sintering route. The densification of the WC–ZrO2 composites was performed 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. A transition in friction and wear with load is noted. The dominant mechanisms of material removal are tribochemical wear and spalling of tribolayer
Description: Copyright for this article belongs to Elsevier Science Ltd
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