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Continuous SiC fiber-reinforced Ti 2 AlNb matrix composites have a great potential for high-temperature aviation structure applications, and their properties strongly depend on the microstructure of the interfacial reaction layer. Notably, introducing diffusion barrier coatings has still been a popular strategy for optimizing the interfacial structure and interfacial properties of SiC f /Ti. In this work, C coating and C/B 4 C duplex coating were successfully fabricated onto SiC fibers via chemical vapor deposition (CVD), then consolidated into the SiC f /C/Ti 2 AlNb and the SiC f /C/B 4 C/Ti 2 AlNb composites, respectively, via hot isostatic pressing (HIP) under the condition of 970 °C, 150 MPa, 120 min, and finally furnace cooled to room temperature. The C- and C/B 4 C-dominated interfacial reactions in the SiC f /C/Ti 2 AlNb and the SiC f /C/B 4 C/Ti 2 AlNb were explored, revealing two different reaction products sequences: The different-sized TiC and the coarse-grained (Ti,Nb)C + AlNb 3 for the SiC f /C/Ti 2 AlNb; and the fine-grained TiB 2 + TiC, the needle-shaped (Ti,Nb)B 2 /NbB + (Ti,Nb)C, the coarse-grained (Ti,Nb)C + AlNb 2 for the SiC f /C/B 4 C/Ti 2 AlNb. Annealing experiments were further carried out to verify the different reaction kinetics caused by C coating and C/B 4 C duplex coating. The reaction layer (RL)-dominated interfacial strength and tensile strength estimations showed that higher interface strength and tensile strength occurred in the SiC f /C/Ti 2 AlNb instead of the SiC f /C/B 4 C/Ti 2 AlNb, when the same failure mode of fiber push-out took place.

Interfacial Reactions and Mechanical Properties Studies of C-Coated and C/B4C Duplex-Coated SiC Fiber-Reinforced Ti2AlNb Composites