Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437254 | Ceramics International | 2017 | 21 Pages |
Abstract
Si3N4-based composite ceramic tool materials with (W,Ti)C as particle reinforced phase were fabricated by microwave sintering. The effects of the fraction of (W,Ti)C and sintering temperature on the mechanical properties, phase transformation and microstructure of Si3N4-based ceramics were investigated. The frictional characteristics of the microwave sintered Si3N4-based ceramics were also studied. The results showed that the (W,Ti)C would hinder the densification and phase transformation of Si3N4 ceramics, while it enhanced the aspect-ratio of β-Si3N4 which promoted the mechanical properties. The Si3N4-based composite ceramics reinforced by 15 wt% (W,Ti)C sintered at 1600 °C for 10 min by microwave sintering exhibited the optimum mechanical properties. Its relative density, Vickers hardness and fracture toughness were 95.73 ± 0.21%, 15.92 ± 0.09 GPa and 7.01 ± 0.14 MPa m1/2, respectively. Compared to the monolithic Si3N4 ceramics by microwave sintering, the sintering temperature decreased 100 °Cï¼the Vickers hardness and fracture toughness were enhanced by 6.7% and 8.9%, respectively. The friction coefficient and wear rate of the Si3N4/(W,Ti)C sliding against the bearing steel increased initially and then decreased with the increase of the mass fraction of (W,Ti)C., and the friction coefficient and wear rate reached the minimum value while the fraction of (W,Ti)C was 15 wt%.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Weiwei Xu, Zengbin Yin, Juntang Yuan, Zhenhua Wang, Yue Liu,