The influence of precursor structure on the development of porosity in polymer-derived SiC

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Polymer-based routes to ceramic oxides take advantage of precursor chemistry and structure to produce materials with a range of pore sizes. Polymer precursor routes to non-oxide ceramics offer products with superior thermal and chemical stability in many cases. Polymethylsilane (PMS), a versatile cross linked SiC precursor, [(MeHSi){sub x}(MeSi){sub y}], was synthesized using published procedures to yield fluid precursors with a low (20--40%) degree of cross linking. Unique, highly cross linked (60--70%), solid polymers were produced under reaction conditions which carefully conserve the volatile monomer. These two polymers were converted to SiC to determine the relative importance of the various contributions ... continued below

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6 p.

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Nebo, J. F.; Scotto, C. S.; Bennett, C. A. & Brinker, C. J. July 1996.

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  • Nebo, J. F. Univ. of New Mexico, Albuquerque, NM (United States). Center for Micro-Engineered Ceramics
  • Scotto, C. S. Sandia National Labs., Albuquerque, NM (United States). Advanced Materials Lab.
  • Bennett, C. A. Univ. of Toledo, OH (United States). Dept. of Chemical Engineering
  • Brinker, C. J. Univ. of New Mexico, Albuquerque, NM (United States). Center for Micro-Engineered Ceramics

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Polymer-based routes to ceramic oxides take advantage of precursor chemistry and structure to produce materials with a range of pore sizes. Polymer precursor routes to non-oxide ceramics offer products with superior thermal and chemical stability in many cases. Polymethylsilane (PMS), a versatile cross linked SiC precursor, [(MeHSi){sub x}(MeSi){sub y}], was synthesized using published procedures to yield fluid precursors with a low (20--40%) degree of cross linking. Unique, highly cross linked (60--70%), solid polymers were produced under reaction conditions which carefully conserve the volatile monomer. These two polymers were converted to SiC to determine the relative importance of the various contributions to porosity, and to assess the role of precursor structure on porosity development in non-oxides. Initial results indicate that precursor structure has little effect on porosity. The development of the porosity appears to be dominated by high temperature thermochemistry and/or microstructural changes.

Physical Description

6 p.

Notes

OSTI as DE96012937

Source

  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996

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  • Other: DE96012937
  • Report No.: SAND--96-1730C
  • Report No.: CONF-960401--63
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 266617
  • Archival Resource Key: ark:/67531/metadc664701

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • July 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 13, 2016, 2:30 p.m.

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Nebo, J. F.; Scotto, C. S.; Bennett, C. A. & Brinker, C. J. The influence of precursor structure on the development of porosity in polymer-derived SiC, article, July 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc664701/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.