Boron & SiC Properties

• Boron and SiC have very high modulus and strength

• Crystal structure

  • Boron is small crystals
    • Amorphous
  • SiC has
    • larger crystal structure

• SiC fibers have smoother surface than boron
  • Surface defects and flaws limit the strength
  • SiC has excellent high temp properties due to SiC not reacting with the carbon. Especially important in metal matrix composites where reinforcements may be subjected to molten metal.

• Boron fibers have high modulus due to swelling of Tungsten filament when reacting with boron trichloride
  • Surface structure is scale-like or corn-cob appearance
  • Internal defects on surface determines strength properties

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