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The Influence of Fibers, Matrices, and Interfaces on the Properties of Ceramic Matrix Composites

  • John J. Brennan
  • James R. Strife
  • Karl M. Prewo
Chapter

Abstract

With the interest in ceramic matrix composites for high temperature structural applications increasing around the world during the past decade, especially for use in heat engines, a myriad of different systems and different processing procedures have emerged. Among the types of CMC’s under investigation are: whisker reinforced crystalline and glass-ceramics, and continuous carbide, oxide, and nitride fiber reinforced ceramics. The range of fabrication methods is diverse and includes hot-press densification of glasses, glass-ceramics, and crystalline ceramics, sol-gel infiltration and pyrolysis of ceramics, polymer precursor infiltration and pyrolysis, reactive oxidation of metals, reactive sintering, and chemical vapor infiltration (CVI) of silicon based ceramics.

In all of these composite systems, it has been found that in order to achieve high strength and, in particular, high toughness, the characteristics of the fiber/matrix interface must be controlled such that the bond is strong enough to allow load transfer from the matrix to the fibers under stress, but weak enough so that an advancing matrix crack can be deflected by the fibers. In addition, the nature of the fiber/matrix interface must include high temperature stability and resistance to environmental attack. Examples of CMC’s with both weak and strong interfacial bonding will be discussed, with emphasis on SiC and Si3N4 type continuous fibers in glass and glass-ceramic matrices, as well as SiC, C, and oxide continuous fibers in CVI SiC matrices.

Progress in the application of ceramic matrix composites to heat engines will also be discussed.

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Copyright information

© Elsevier Science Publishers Ltd and MPA Stuttgart 1992

Authors and Affiliations

  • John J. Brennan
    • 1
  • James R. Strife
    • 1
  • Karl M. Prewo
    • 1
  1. 1.United Technologies Research CenterEast HartfordUSA

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