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Abstract SiC fibers reinforced SiBCN ceramic matrix composites (SiCf/BN/SiBCN composites) were synthesized by direct chemical vapor infiltration (CVI), polymer infiltration pyrolysis (PIP) or chemical vapor infiltration combined with polymer infiltration… Click to show full abstract
Abstract SiC fibers reinforced SiBCN ceramic matrix composites (SiCf/BN/SiBCN composites) were synthesized by direct chemical vapor infiltration (CVI), polymer infiltration pyrolysis (PIP) or chemical vapor infiltration combined with polymer infiltration pyrolysis (CVI + PIP). It is shown that the insertion of a continuous and dense SiBCN matrix via the CVI process improves the flexural strength and modulus. Interface debonding and fiber pullout happened with 50–100 nm BN interface in CVI and CVI + PIP SiCf/BN/SiBCN composites. The relative complex permittivity was measured in X-band. Higher e′′ values in CVI-containing composites can be observed, which can be attributed to the accumulation of C and SiC phases and a multilayer matrix. Strong electromagnetic wave attenuation ability was obtained with high dielectric loss.
Journal Title: Journal of the European Ceramic Society
Year Published: 2019
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