August 1997 Tensile Stress Rupture of sic/siCm Minicomposites with C and BN Interphases at Elevated Temperatures in Air 2031 100 (c) 10 Fig. 1. Optical micrographs of the polished cross sections for(a)C-Nic, (b) 3MBN-Nic, (c and d) PBN-HN, and(e)3MBN-HN minicompositesFig. 1. Optical micrographs of the polished cross sections for (a) C-Nic, (b) 3MBN-Nic, (c and d) PBN-HN, and (e) 3MBN-HN minicomposites. August 1997 Tensile Stress Rupture of SiCf/SiCm Minicomposites with C and BN Interphases at Elevated Temperatures in Air 2031