THERMAL TRANSPORT IN SIC-FIBER SIC-MATRIX COMPOSITES

SiC fibre/SiC matrix composites were fabricated by the deposition of S iC matrix material onto an array of SiC (Nicalon) fibres using the che mical vapour infiltration technique (CVI). Two unidirectional composit es were prepared and the thermal diffusivities of these and of the SiC fibres were measured over the temperature range 350-1500 K. The data are compared and discussed in terms of the microstructural characteris tics of the matrix material. Data for a sample sectioned at 45-degrees to the fibre axis are also presented.