Case 7247

Precursor for near-stoichiometric silicon carbide for efficient shrinkage control of particles


Powder metallurgy, functionally graded materials, polymeric ceramic precursors, thermal expansion, ceramic material composition, corrosion resistance, ultrasonification, layer-by-layer process, pyrolysis, shrinkage control


Thermal or corrosive material resistance, biotechnology for bone implants


Shrinkage control efficiency of particles prepared from powder metallurgy of functionally graded materials


This invention is an improved powder metallurgy technique for functionally graded material (FGM) preparation, which involves the use of pre-ceramic polymers as binders for metal/ceramic powder blends, and provides shrinkage control of each individual layer. The two FGM systems prepared include the Al/SiC FGM for use in aerospace applications due to its light weight and high durability, and the Cu/Sic FGM for use in dynamic seal applications as in mechanical face seals where corrosion resistance and good heat transfer ability are required.

  • Shrinkage control of individual composite layers
  • Avoidance of the commercially-used de-binding step
  • Simpler preparation process than conventional powder metallurgy techniques
  • Minimal steric hindrance to rupturing Si-H bond(s)

  • Professor Dietmar Seyferth (Department of Chemistry, MIT)
  • Pawel Czubarow (Saint-Gobain Corporation)
  • Toshiya Sugimoto (Sartomer Japan, Inc.)

Intellectual Property:

U.S. Patent Number 6,020,447; issued February 1, 2000



Last revised: November 5, 2010

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