Abstract
Interface structure of ceramic matrix composite is crucial for flexural strength, fracture toughness, electromagnetic wave (EMW) absorbing properties, and oxidation resistance. This work prepared the multi-layer C-SiC interfaces in SiCf/mullite composites via a precursor infiltration-pyrolysis process (PIP) combining ball-milling dispersion. The effects of the interface thickness on the flexural strength, toughness, and EMW absorbing performance were investigated. The result shows that the SiCf/mullite with a thickness (t) of 0.32 μm C-SiC interface exhibits excellent flexural strength (154.66 MPa) and strong absorbing performance with a broad effective absorption bandwidth (EAB, RL ≤-10 dB) covering the whole X-band. The composite with a 1.35 μm C-SiC interface significantly improves up to 32.01 MPa·m1/2 in fracture toughness. The oxidation behaviors of SiCf/C-SiC/mullite under 1000°C were also investigated by analyzing the cross-section morphology and fracture models. The C-SiC interface isolated the SiO2 generated on the fiber from the Al2O3 in the matrix. The flexural strength retention rate of the oxidized composite is 82% when the thickness of C-SiC interface is 0.32 μm.
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