1. Strong ZrB2- SiC- WC Ceramics at 1600°C.
- Author
-
Zou, Ji, Zhang, Guo-Jun, Hu, Chun-Feng, Nishimura, Toshiyuki, Sakka, Yoshio, Vleugels, Jef, Biest, Omer, and Monteverde, F.
- Subjects
FLEXURAL strength testing ,ZIRCONIUM compounds ,CERAMIC materials testing ,CERAMIC material fracture ,FRACTURE toughness (Materials science) ,EFFECT of temperature on ceramic materials - Abstract
High temperature flexural strength of ZrB
2 -20 vol% SiC ceramics ( ZS) up to 1600°C in high purity argon atmosphere was significantly improved by adding 5 vol% WC, but degraded when 5 vol% ZrC was added. ZrB2 -20 SiC-5 WC ceramic ( ZSW) has a very high strength (mean ± SD) of 675 ± 33 MPa at 1600°C, and also an elastic and transgranular fracture mode was observed. According to the analysis of the fracture modes and crack origins in ZSW ceramics, the improvement in strength above 1000°C was attributed to the removal of the oxide impurities from grain boundaries. [ABSTRACT FROM AUTHOR]- Published
- 2012
- Full Text
- View/download PDF