Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1603457 | International Journal of Refractory Metals and Hard Materials | 2013 | 10 Pages |
Abstract
The thermal shock behavior of ZrB2-SiC composite ceramics was remarkably enhanced by the addition of TaSi2 particles. TaSi2 enhanced the residual strength within the temperature range resulting from the crack-healing effect, especially at ~ 1400 °C. Residual fracture toughness increased with increasing TaSi2 content from 1000 °C to 1600 °C. The addition of soft phase TaSi2 positively affected the toughening mechanism. Considering the consumption of TaSi2 at ~ 1400 °C, fracture toughness of the TaSi2-containing ZrB2-SiC based ceramic decreased with increasing temperature. The formation of a compressive stress zone beneath the surface oxide layer increased fracture toughness at 1600 °C. The cohesive structure of the TaSi2-containing ZrB2-based material inhibited crack formation and retained higher mechanical properties. Apparent surface changes were observed as a result of oxidation after severe thermal shock test. From the viewpoint of thermodynamics, thermal oxidation resistance improved with the addition of TaSi2.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Shubin Wang, Cheng Xu, Yongbin Ding, Xinghong Zhang,