Journal of Materials Science

, Volume 27, Issue 10, pp 2811–2822 | Cite as

Interface characterization and fracture of calcium aluminosilicate glass-ceramic reinforced with nicalon fibres

  • S. M. Bleay
  • V. D. Scott
  • B. Harris
  • R. G. Cooke
  • F. A. Habib


An investigation of the structure and properties of a calcium aluminosilicate glass-ceramic reinforced with Nicalon fibres is described. Microstructural analysis of the interface showed that during manufacture of the composite a reaction zone rich in carbon formed between the Nicalon fibre and the anorthite matrix. Tensile strengths were approximately 330 MPa for unidirectional material and around 210 MPa for a (0°/90°)3s. composite, little more than half that predicted by the mixtures rule. Flexural strengths were, however, higher than tensile strengths, by a factor 1.5–2.5 depending on lay-up. Studies carried out on specimens heat treated in air for 24 h at temperatures in the range 600–1200 °C showed a progressive change of interface microstructure in the outermost regions of the specimens due to oxidation of the carbon-rich layer; at 1000 °C and above the carbon had disappeared to leave voids and silica-rich bridges between fibre and matrix. These changes affected the strength of the interfacial bond, as measured by an micro-indentation technique, and also the degree of fibre pull-out produced in mechanical tests. Thus as-received material exhibited appreciable pull-out whilst heattreated samples were characterized by brittle behaviour in the outer (oxidized) regions. Nevertheless, the composites whilst in the unstressed condition appeared to survive these short-term exposures to oxidizing environments. An interfacial shear stress of around 5 MPa was calculated by applying the Aveston, Cooper and Kelly theory to crack spacings measured in our room-temperature deformation experiments, a value which agreed well with the 3–5 MPa obtained by the micro-indentation method.


Tensile Strength Flexural Strength Interfacial Shear Interfacial Shear Stress Interface Microstructure 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • S. M. Bleay
    • 1
  • V. D. Scott
    • 1
  • B. Harris
    • 1
  • R. G. Cooke
    • 1
  • F. A. Habib
    • 1
  1. 1.School of Materials ScienceUniversity of BathBathUK

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