TY - JOUR
T1 - Microstructure and mechanical properties of Cf/SiC composites fabricated by RMI
T2 - Effect of Cf/C preform heat treatment
AU - Shang, Jianzhao
AU - Liu, Yongsheng
AU - Chen, Jian
AU - Cao, Yejie
AU - Pan, Yu
AU - Li, Jingxin
AU - Zhang, Yunhai
AU - Liu, Yansong
N1 - Publisher Copyright:
© 2025 Elsevier Inc.
PY - 2025/7
Y1 - 2025/7
N2 - The correlation of the pore structures and graphitization degree of Cf/C preforms and the microstructure and properties of Cf/SiC composites is significance for the fabrication of ceramic matrix composites by reactive melt infiltration (RMI). This study systematically investigates the impact of heat treatment temperature on the pore structure and graphitization degree of porous Cf/C preforms and the subsequent microstructure and mechanical performance of Cf/SiC composites. Results reveal that increasing heat treatment temperature leads to greater porosity and higher graphitization, promoting enhanced silicon infiltration and SiC formation. However, excessive infiltration of molten Si causes fiber erosion, compromising mechanical properties. The untreated composite exhibited the highest flexural strength of 237.4 MPa, while the composite from the 2000 °C-treated preform showed increased density but reduced strength due to brittle fracture behavior. This study also focused on the effects of infiltration temperature and time on properties and infiltration depth of composites was also calculated by dynamics. These findings emphasize the importance of optimizing heat treatment conditions and RMI parameters to balance densification, microstructure, and mechanical performance in Cf/SiC composites, offering valuable insights into optimizing fabrication processes for high-performance Cf/SiC composites.
AB - The correlation of the pore structures and graphitization degree of Cf/C preforms and the microstructure and properties of Cf/SiC composites is significance for the fabrication of ceramic matrix composites by reactive melt infiltration (RMI). This study systematically investigates the impact of heat treatment temperature on the pore structure and graphitization degree of porous Cf/C preforms and the subsequent microstructure and mechanical performance of Cf/SiC composites. Results reveal that increasing heat treatment temperature leads to greater porosity and higher graphitization, promoting enhanced silicon infiltration and SiC formation. However, excessive infiltration of molten Si causes fiber erosion, compromising mechanical properties. The untreated composite exhibited the highest flexural strength of 237.4 MPa, while the composite from the 2000 °C-treated preform showed increased density but reduced strength due to brittle fracture behavior. This study also focused on the effects of infiltration temperature and time on properties and infiltration depth of composites was also calculated by dynamics. These findings emphasize the importance of optimizing heat treatment conditions and RMI parameters to balance densification, microstructure, and mechanical performance in Cf/SiC composites, offering valuable insights into optimizing fabrication processes for high-performance Cf/SiC composites.
KW - C/C preforms
KW - Mechanical properties
KW - Microstructure
KW - Pore structures
KW - Reactive melt infiltration
UR - https://www.scopus.com/pages/publications/105005255145
U2 - 10.1016/j.matchar.2025.115171
DO - 10.1016/j.matchar.2025.115171
M3 - 文章
AN - SCOPUS:105005255145
SN - 1044-5803
VL - 225
JO - Materials Characterization
JF - Materials Characterization
M1 - 115171
ER -