Abstract
In this work, pitch-based carbon fibers were utilized to reinforce silicon carbide (SiC) composites via reaction melting infiltration (RMI) method by controlling the reaction temperature and resin carbon content. Thermal conductivities and bending strengths of composites obtained under different preparation conditions were characterized by various analytical methods. Results showed the formation of SiC whiskers (SiCw) during RMI process according to vapor—solid (VS) mechanism. SiCw played an important role in toughening the Cpf/SiC composites due to crack bridging, crack deflection, and SiCw pull-out. Increase in reaction temperature during RMI process led to an initial increase in thermal conductivity along in-plane and thickness directions of composites, followed by a decline. At reaction temperature of 1600 °C, thermal conductivities along the in-plane and thickness directions were estimated to be 203.00 and 39.59 W/(m·K), respectively. Under these conditions, bending strength was recorded as 186.15±3.95 MPa. Increase in resin carbon content before RMI process led to the generation of more SiC matrix. Thermal conductivities along in-plane and thickness directions remained stable with desirable values of 175.79 and 38.86 W/(m·K), respectively. By comparison, optimal bending strength improved to 244.62±3.07 MPa. In sum, these findings look promising for future application of pitch-based carbon fibers for reinforcement of SiC ceramic composites.
Highlights
Continuous carbon fiber reinforced silicon carbide matrix composites (C/SiC) are promising thermal structuralJ Adv Ceram 2022, 11(2): 247–262 pyrolysis (PIP), as well as the mechanical properties of obtained C/SiC composites to satisfy the increasingly stringent demands for new types of aerospace vehicles and advanced engines [4,5].the poor heat conduction of C/SiC composites along the in-plane and thickness directions has limited their wider applications
Yang et al [10] successfully improved the thermal conductivity of C/SiCN composites to 5.6 W/(m K) by embedding carbon nanotubes (CNTs) into inter-bundle spaces of two adjacent carbon fiber sheets by the vacuum infiltration method
Cpf/SiC composites were successfully fabricated by reaction melting infiltration (RMI) method by controlling the reaction temperature and resin carbon content
Summary
Continuous carbon fiber reinforced silicon carbide matrix composites (C/SiC) are promising thermal structural. Polyacrylonitrile (PAN)-based carbon fibers, such as T300 and T700, are preferred fiber reinforcement materials used in C/SiC composites for aerospace applications due to their excellent mechanical properties [13,14]. Mainzer et al [20] used pitch-based fibers to produce C/SiCN composites via PIP method with a tensile strength of 288 MPa. pitch-based carbon fiber reinforced ceramic matrix composites are promising but their potential in the engineering field is still untapped. Li et al [22] studied the effects of different diamond concentrations on thermal conductivities of diamond–C/SiC produced by RMI method They found that higher diamond concentrations led to improved density (2.18 g/cm3), bending strength (309.01 MPa), and thermophysical properties (thermal conductivity: 14.68 W/(m K), thermal expansion coefficient: 2.69×10−6 K−1) of the resulting composites. The results indicated that Cpf/SiC composites possessed good bending strength and excellent thermal conductivity
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