کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1571028 | 1514392 | 2014 | 6 صفحه PDF | دانلود رایگان |

• ZrB2-based ceramics toughened by short ZrO2 fiber are characterized by TEM and HRTEM.
• The orientation relationship of t- and m-ZrO2 are (100)m//{100}t, [001]m//〈001〉t
• The clean interface without any impurities leads to improve the toughening mechanism.
Two different ZrB2-based ultra-high temperature ceramics were produced by hot pressing: ZrB2 + 20 vol.% SiC particle + 15 vol.% ZrO2 fiber and ZrB2 + 20 vol.% SiC whisker + 15 vol.% ZrO2 fiber. The microstructures were analyzed by using transmission electron microscopy and high-resolution transmission electron microscopy. It was shown that a clean interface without any impurities was identified in ZrB2-based hybrid ceramics with SiC whiskers and ZrO2 fibers, which would significantly improve the toughening mechanism. The results of high-resolution transmission electron microscopy showed that stacking faults in SiC whiskers resulted from an insertion of a (111) layer, which would be one of the main reasons for material anisotropy. However, the interface between the SiC particle and ZrO2 fiber was found to be ambiguous in ZrB2-based hybrid ceramics with SiC particles and ZrO2 fibers due to the slight reaction. The orientation relationship between t-ZrO2 and m-ZrO2 phases obeyed the classical correspondence: (100)m//{100}t and [001]m//〈001〉t, which further verified the feasibility of phase transformation toughening mechanism.
Journal: Materials Characterization - Volume 95, September 2014, Pages 272–277