The creep behavior of SiC/C/SiC microcomposites at 1200- 1400 deg.C and 140-450 Mpa was investigated in the presence and absence ofmatrix cracking. The microcomposites consisted of single Hi Nicalonfibers coated with a CVD carbon interlayer and a CVD SiC matrix.Since the fibers and matrix had been examined by the sameexperimental technique, direct comparisons of the creep of thecomposite and of the constituents were performed. The creep ofuncracked microcomposites was successfully modeled using a simplerule of mixtures algorithm. When matrix cracks were present, themicrocomposites were modeled using a series composite consisting ofintact microcomposite, exposed fiber at the matrix crack, and thedebonded region between these first two regions.
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