Strong, Tough Ceramics Containing Microscopic Reinforcements: Tailoring In-Situ Reinforced Silicon Nitride Ceramics Metadata

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  • Main Title Strong, Tough Ceramics Containing Microscopic Reinforcements: Tailoring In-Situ Reinforced Silicon Nitride Ceramics


  • Author: Becher, P.F.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy. Office of Energy Research.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Energy Research (ER) (United States)


  • Name: Oak Ridge National Laboratory
    Place of Publication: Tennessee
    Additional Info: Oak Ridge National Lab., TN (United States)


  • Creation: 1999-06-27


  • English


  • Content Description: Ceramics with their hardness, chemical stability, and refractoriness could be used to design more efficient energy generation and conversion systems as well as numerous other applications. However, we have needed to develop a fundamental understanding of how to tailor ceramics to improve their performance, especially to overcome their brittle nature. One of the advances in this respect was the incorporation of very strong microscopic rod-like reinforcements in the form of whiskers that serve to hold the ceramic together making it tougher and resistant to fracture. This microscopic reinforcement approach has a number of features that are similar to continuous fiber-reinforced ceramics; however, some of the details are modified. For instance, the strengths of the microscopic reinforcements must be higher as they typically have much stronger interfaces. For instance, single crystal silicon carbide whiskers can have tensile strengths in excess of {ge}7 GPa or >2 times that of continuous fibers. Furthermore, reinforcement pullout is limited to lengths of a few microns in the case of microscopic reinforcement due as much to the higher interfacial shear resistance as to the limit of the reinforcement lengths. On the other hand, the microscopic reinforcement approach can be generated in-situ during the processing of ceramics. A remarkable example of this is found in silicon nitride ceramics where elongated rod-like shape grains can be formed when the ceramic is fired at elevated temperatures to form a dense component.
  • Physical Description: 4 p.


  • Keyword: Tensile Properties
  • Keyword: Silicon Nitrides
  • Keyword: Silicon Carbides
  • STI Subject Categories: 36 Materials Science
  • Keyword: Stability
  • Keyword: Monocrystals
  • Keyword: Ceramics
  • Keyword: Hardness


  • Conference: International Conference on Composites Engineering, Orlando, FL (US), 06/27/1999--07/03/1999


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Report No.: ORNL/CP-101917
  • Report No.: KC 02 01 05 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 3917
  • Archival Resource Key: ark:/67531/metadc678626


  • Display Note: OSTI as DE00003917
  • Display Note: Medium: P; Size: 4 pages