Abstract
Abstract Molybdenum disilicide offers the potential of enhancing the mechanical properties of silicon-base composite structural materials. This material can be alloyed with other ceramics, e.g. Si 3 N 4 , to increase the cracking strength, toughness, and oxidation resistance. Matrix toughness is shown to have a significant influence on increasing the matrix cracking stress and is one of the few material variables that can be controlled. The uniaxial stress-strain behavior of MoSi 2 –Si 3 N 4 matrix composites reinforced with SCS-6 fibers demonstrates a high load carrying capacity at high strains. The overall toughness can also be significantly enhanced, particularly at high temperatures. These results suggest that the alloying capabilities of MoSi 2 matrix systems will provide the flexibility needed to achieve further improvements in material performance for silicon-base composites.
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