Preparation and property characterization of C/SiC composite thruster

Continuous carbon fiber reinforced silicon carbide matrix composite thrusters were prepared by using" chemical vapor infiltration+precursor impregnation pyrolysis" (CVI+PIP) hybrid process. The mechanical properties, gas tightness and microstructure of 3D C/SiC composites were comprehensively investigated through attitude control and orbit control rocket motor environmental test. The results show that CVI+PIP hybrid process can not only shorten process cycle, but also improve composite properties. The density of C/SiC composite can reach 2.1 g/cm³. The flexural strength and fracture toughness (KIC) of the composite at room temperature are 520 MPa and 17.9 MPa·m^1/2 respectively. The fracture damage behavior of the composite presents typical toughness mode. High-temperature gas tightness, anti-oxidation and ablation properties of the C/SiC composite thruster are verified through bipropellant liquid rocket motor test.