Combination of PIP and LSI processes for SiC/SiC ceramic matrix composites

Silicon carbide fiber-reinforced silicon matrix composites (SiC/SiC CMCs) are promising candidates for hot gas components in jet engines. Three common manufacturing routes chemical vapor infiltration, reactive melt infiltration (RMI) and polymer pyrolysis (PIP). A combination of the processes seems attractive: remaining porosity after PIP process can be closed by subsequent siliconization, resulting a dense material. This work describes new approach combined RMI process. SiC/SiC CMCs were manufactured using Hi-Nicalon Type S fibers. An additional was carried out reduced number cycles. Microstructure examined via μCT, SEM EDS. Bending strength determined to 433 ​MPa; strain failure 0.60%. The overall processing time 55% compared standard route. hybrid material contained 70% less unreacted carbon than produced LSI alone.