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C-SiC binary matrix composites, made from a porous C-C preform infiltrated with SiC, are mechanically characterized under tensile, compressive, flexural, and shear loading. The results of these tests show that the materials exhibit non-brittle fracture and have excellent strength. The oxidation behavior of the materials has been studied. Measured mass loss data from the C-SiC binary matrix compos ites indicated lower mass loss rate compared with SiC-coated C-C composites. The microstructures were investigated by X-ray diffraction, scanning electron microscope, and polarized optical microscope. The properties of C-SiC binary matrix composites are discussed in relation to the microstructures.