Influence of Grain Size Distribution on Hardness and Fracture Toughness of Si3N4/SiC Nanocomposites

Abstract:

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Si3N4/SiC nanocomposite material with yttria as sintering additive was prepared by hot pressing method. SiC nanoinclusions were produced by in situ reaction between SiO2 and C during the sintering process. The homogenous microstructure of hot pressed samples contained fine Si3N4 grains with average diameter of 200 nm. The post-sintering treatment at 1750°C for 26 and 70 hours significantly changed the microstructure of Si3N4/SiC composites. The difference between the average grain size of hot pressed sample and sample treated for 70 hours is approx. 300 %. In sake of this fact the mechanical properties (KIC, HV1) were not changed significantly. The largest differences between the mechanical properties of hot pressed and annealed samples were only 8 %.

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Periodical:

Edited by:

P. VINCENZINI

Pages:

1680-1683

DOI:

10.4028/www.scientific.net/AST.45.1680

Citation:

M. Hnatko et al., "Influence of Grain Size Distribution on Hardness and Fracture Toughness of Si3N4/SiC Nanocomposites ", Advances in Science and Technology, Vol. 45, pp. 1680-1683, 2006

Online since:

October 2006

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$35.00

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