Thermal shock behavior of a three-dimensional SiC/SiC composite |
| |
Authors: | Shoujun Wu Laifei Cheng Litong Zhang Yongdong Xu |
| |
Affiliation: | (1) National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, 710072 Xi’an Shaanxi, People’s Republic of China |
| |
Abstract: | Thermal shock behavior of a three-dimensional (3-D) SiC/SiC composite was studied using the water-quenched method. Thermal
shock damage of the composite was assessed by scanning electron microscopy characterization and residual three-point-bending
strength. In the thermal shock process, the composite displayed the same bending mechanical behaviors as those of the original
composite and retained 80 pct of the original strength in the longitudinal direction after being quenched from 1200°C to 25°C
in water for 100 cycles. However, the composite displayed anisotropy in resistance to thermal shock damage. The observed microdamage
processes were as follows: (1) formation of micropores and long crack, (2) transfer and growth of pores, (3) saturation of
the dimension and the density of pores, and (4) accelerated growth of the long crack along the longitudinal direction. The
critical thermal shock number for the composite was about 50. When thermal shock was less than 50 cycles, the residual flexural
strength of the composite decreased with thermal shock cycles increasing. When the number was greater than 50, the strength
of the composite did not decrease further. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|