BRENNAN: INTERFACIAL CHARACTERIZATION SylramicTM 5HS 1200°CUTs=288MPa,Ef=0.48% 1200CUTS=286MPa,f=0.21 UTRC Fig 3. Fracture surface comparison between MI SiC/SiC composites with Hi-Nicalon and Sylramic SiC fibers Hi-Nicalon Fiber Sylramie M Fiber 1331510,8010u05 18.Bk I RMS 2.137 nM I 17,561 Fig 4. Fiber surface roughness differences between Sylramic and Hi-Nicalon SiC fibers4622 BRENNAN: INTERFACIAL CHARACTERIZATION Fig. 3. Fracture surface comparison between MI SiC/SiC composites with Hi-Nicalon and Sylramic SiC fibers. Fig. 4. Fiber surface roughness differences between Sylramic and Hi-Nicalon SiC fibers