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Nanostructured SiCN Ceramics from Block Copolymers

详细技术说明
The invention relates to a new method for creating nanostructured non-oxide ceramic materials, including high temperature SiCN and SiC materials.
*Abstract

Cornell researchers developed a new method for creating nanostructured non-oxide ceramic materials, including high temperature SiCN and SiC materials. These new materials can serve as replacements for oxide ceramics where high temperature stable and mechanically robust materials are needed.

 

The nanostructured composite material is created using a block copolymer, preferable PI-b-PEO, as a structure-directing agent for a high temperature PDC precursor, preferably a non-oxide ceramic precursor. The PDC precursor is polymerized after mixing with the block copolymer to form a nanostructured composite material. Further heating transforms the nanostructured composite material into a nanostructured non-oxide ceramic material. Nanostructured composite material with well-defined morphologies (lamellar, hexagonal) have been produced by blending a silazane-based SiCN ceramic precursor (commercially available Ceraset was used) with a block copolymer, and subsequently crosslinking the silazane using a free radical initiator at 120° C. High temperature treatment up to 1500° C generates, e.g., mesoporous high temperature non-oxide ceramics with high surface areas.

 

Potential Commercial Applications
  • Catalysis
    • Fuel cells
    • Fuel reformation
  • MEMS
  • Filtration
  • Replacement for high temperature ceramics
  • Method for creating:
    • Macroscopically orientated materials
    • Mesoporous solids

 

Advantages
  • Mechanically robust and thermally stable at high temperatures
  • High percentage of crystallinity
  • Structural control on the nanoscale level
  • Lamellar morphology
  • Made using commercially available materials
*Licensing
Jeff Fearnjcf55@cornell.edu607-254-4502
其他
  • Issued patent in the U.S. no.7,087,656
  • Garcia, Carlos B. W., etal. (2003). Synthesis and characterization of block copolymer/ceramic precursornanocomposites based on a polysilazane. Journal of Polymer SciencePart B: Polymer Physics 41(24), 3346-3350. DOI: 10.1002/polb.10705.

 

国家/地区
美国

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