Investigation of C/Si₃N₄ Nanocomposites

Abstract

These mixtures were mechanochemically activated several hours in a planetary type alumina ball-mill in order to achieve a homogenous mass. As an alternative to nano-and micrograins, carbon fibres have been added to carbon free silicon nitride batches. Sinter-HIP has been applied to rectangular bars which were earlier dry pressed. Structural and morphological analysis were performed on as-prepared samples. Bending strength and elastic modulus have been found to be influenced by amount of carbon black and graphite introduced in silicon nitride matrix.

Manufacture and Compositional Analysis of Silicon Nitride Composites with Different Carbon Additions

“…In this case, the formation of bulk silicon nitride based nanocomposite is realized by carbothermal reduction of SiO 2 by carbon in the Y 2 O 3 -SiO 2 system at the sintering temperature, with SiC nanoparticles as result. Although, the mechanical properties of as-prepared samples should be further optimized, this process seems to be a perspective choice for silicon nitride-silicon carbide nanocomposite production [7]. In this paper silicon nitride based nanocomposites were prepared through carbon black addition by mechanochemical synthesis and hot isostatic pressing (HIP).…”