UNSPECIFIED. (1993) MICROSTRUCTURE PROPERTY RELATIONSHIPS IN SILICATE-MATRIX COMPOSITES. JOURNAL OF MICROSCOPY-OXFORD, 169 (Part 2). pp. 109-118. ISSN 0022-2720

Abstract

Electron microscopy and associated analytical spectroscopic techniques have been used to characterize interfaces in SIC-fibre/silicate-matrix composites. Interface structure, formed via reaction during hot-press fabrication, is a function of time, temperature, matrix composition and fibre type. Interfaces with Nicalon or Tyranno fibres vary from amorphous carbon in fine precipitated form to continuous graphitic layers. Interface behaviour in a stressed composite, and hence the matrix microcracking stress, is a sensitive function of microstructure. Interface debond and shear properties have been assessed using indent-based 'push-down' and 'push-through' tests using a specially developed instrument within a scanning electron microscope. This uses piezo-load measurement and translation, and is capable of dynamic image recording of the indentation sequence. Interface micromechanical (indent) measurements have been correlated with structure and macromechanical response in bend testing for a range of fibre/matrix types, processing and post-processing thermal treatments. An example is also given of interfaces prepared by fibre precoating.

Data sourced from Thomson Reuters' Web of Knowledge

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