| Pressureless sintering and tribological properties of WC–ZrO2 composites (2005) | |||||||||||||
Abstract | |||||||||||||
| Pressureless sintering and tribological properties ZrO composites Basu Venkateswaran Sarkar Laboratory for Advanced Ceramics Department Materials and Metallurgical Engineering Indian Institute Technology Kanpur India Abstract recent work Basu Lee and Kim Development ZrO nanocomposites spark plasma sintering Ceram Soc the processing ultrahard ZrO nanocomposites using spark plasma sintering reported the present work investigate the processing and properties ZrO composites densi pressureless sintering route The densi cation the ZrO composites was performed the temperature range with varying time vacuum The experimental results indicate that signi cantly high hardness GPa and moderate fracture toughness MPa can obtained with mol stabilized ZrO sinter additive sintered for Furthermore the friction and wear behavior optimized ZrO composite investigated fretting mode wear tester The tribological results reveal that moderate coef cient friction the range from can achieved with the optimised composite transition friction and wear with load noted The dominant mechanisms material removal are tribochemical wear and spalling tribolayer Keywords Sintering Tribochemical wear ZrO Wear Friction Introduction industrial applications cermets because high machining performance are widely used cutting tool inserts However has certain speci limitation because the presence metallic binder phase which leads failure high temperature due softening and also failure under sudden change loading overcome t. 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 | |||||||||||||
Publication details | |||||||||||||
| |||||||||||||