MI-CMCs

For this article, the term melt infiltrated ceramic matrix composite (MI-CMC) will refer only to continuous fiber composites whose matrices are formed by molten silicon (or silicon alloy) infiltration into a porous SiC- and/or C-containing preform. GE holds nmnerous patents on the composition and fabrication of these materials, only a few of which are listed in reference 10. Such composites can be made from a variety of constituents and processes. A detailed description of the material variations and processes is also given in reference 1, so only an abbreviated description will be given here. 

FIGURE 2. Schematic representation of the various methods for producing HiPeiComp MI CMCs. The bold black highlighted path represents the piepteg process and the highhghted bold gray path represents the slurry cast process. (Reprinted by permission of ASME Press.)... 

FIGURE 3. Typical microstracture ofprepreg HiPerComp MI-CMC material. 

FIGURE 4. Tjfpical microstructure of slurry cast HiPerCompTM MI-CMC material. 

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