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The microstructure of a Nicalon/SiC composite and fibre deformation in the composite

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Abstract

The microstructure of a Nicalon/SiC composite has been examined in detail using electron microscopy. The microstructure of the fibres does not change significantly during fabrication of the composite. It was found that there were two kinds of SiC grains in the matrix, polyhedral-shaped ones near to the fibres with a size ranging from 10–100 nm and columnar grains, further away from the fibres and up to 500 nm in length. It was also found that there is an interfacial layer of thickness about 100 nm between the fibres and the matrix. Fibre deformation was followed using Raman spectroscopy. Well-defined Raman spectra could be obtained from free-standing fibres and the fibres and the matrix in the composite. It was found that for free-standing fibres, the 1350 cm−1 Raman band shifts to lower frequency during tensile deformation. In the composite, the same band shifts to lower frequency during axial compressive deformation indicating that the fibres are in tension while the composite is subjected to overall compression. It is suggested that this behaviour is consistent with the woven arrangement of Nicalon fibres in the composite.

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  1. Polymer Science and Technology Group, Manchester Materials Science Centre, UMIST/University of Manchester, Grosvenor Street, M1 7HS, Manchester, UK

    X. Yang & R. J. Young

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Yang, X., Young, R.J. The microstructure of a Nicalon/SiC composite and fibre deformation in the composite. J Mater Sci 28, 2536–2544 (1993). https://doi.org/10.1007/BF01151689

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