Abstract
Results of two experimental series of fabricating and testing C/B 4C composites are presented. The two fabrication routes used, both based on powder metallurgy, differ from each other by the method of control of the blending stage of the process. This was done either by noting when the appearance of the mixture reached about the same level of homogeneity, independent of fibre volume fraction, or by controlling the mixing time and obtaining mixtures with variable homogeneity and fibre-length distribution. The usual presentation of experimental data as dependence of strength on fibre volume fraction has little physical meaning when one deals with short-fibre composites produced by a powder-metallurgy route. To obtain a basis for modelling the fracture processes, one needs to describe in sufficient detail the formation of the microstructure accompanied by two competing processes, these being an increase in microstructural homogeneity and a reduction in fibre length. It is also shown that in the particular system under consideration the fibre/matrix interface strength can change non-monotically with increase in the temperature and time of the sintering process.
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