The effect of the dimensions of SiC whiskers on the strength and toughness of hot-pressed composites with a 20% volume fraction of whisker reinforcement was studied. It was established that the mechanical properties of the composites were improved only on introducing whiskers with the diameters, within 1.5–2.5 μm. These materials also exhibited a higher resistance to crack propagation. Crystals of smaller diameter had a negative effect on the mechanical properties, which was explained by bundle formation. There is a definite critical content of whiskers ensuring their uniform distribution in the matrix, and this value decreases on reducing the whisker diameter. A correlation was established between composite toughness and the level of average residual compressive stresses in the whiskers.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 26, 2007
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