The effect of surface-modified SiTiCO (Tyranno ) fiber on the tensile behavior of SiC-matrix minicomposites has been examined. Standard SiTiCO fiber and two kinds of surfacemodified fibers were used and the composites were fabricated by a polymer infiltration pyrolysis process. The strengths of the surface-modified-fiber-reinforced minicomposites were significantly improved compared to that of the standard fiber minicomposite. The scattering of tensile strength also decreased with the use of surface-modified fibers. The results demonstrate the achievement of SiTiCO-fiber-reinforced SiCmatrix composite by modifying the surface chemistry of the fiber.

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