Case 7247

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

Keywords:

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

Applications:

Thermal or corrosive material resistance, biotechnology for bone implants

Problem:

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

Technology:

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.

Advantages:
  • 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)

Inventors:
  • 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

Publications:

N/A

Last revised: November 5, 2010

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