Abstract
Continuous carbon fiber reinforced silicon ceramic matrix composites (C/SiC) is a well-known high-performance material for structural parts of the hot end serving in extreme environments. To achieve the 3D/4D printing of C/SiC structures, the effects of the densification process, fiber volume fraction, fiber prestress, and high-temperature heat treatment on the mechanical property and thermal expansion property of unidirectional C/SiC were studied. The results show that the densification of C/SiC can be achieved quickly by combining chemical vapor infiltration (CVI) with polymer infiltration and on-line pyrolysis(PIOP) (CVI+PIOP); the higher the fiber volume fraction is, the lower the bending strength is and the smaller coefficient of thermal expansion (CTE) is; the best fiber prestress is 45 MPa. By confirming the additive manufacturing controlling parameters on the mechanical property and thermal expansion property of unidirectional C/SiC, this paper provides guidance for the design and 3D/4D (three-dimensional/four-dimensional) printing of C/SiC Metamaterial structures.