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Ivor, Michal
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article
Properties of MWCNTs added Si3N4 composites processed from oxidized silicon nitride powders
Abstract
<jats:p>Si3N4/3wt.% multi-walled carbon nanotubes (MWCNTs) composites were preparedfrom oxidized ?-Si3N4 powders and sintering additives by hot isostaticpressing (HIP). The Si3N4 powders were oxidized at 1000?C in ambient airenvironment for 10 and 20 h and the powder mixture was sintered at 1700?Cfor 3 h under the pressure of 20MPa in nitrogen. The relationship betweenoxidation, microstructure, tribology and mechanical properties was studied.The dispersion of MWCNTs was not optimal, as they were found mainly in theform of bundles between the ?-Si3N4 grains. Neither Si2N2O nor other oxidephase were observed after the sintering. This was probably caused by thepresence of MWCNTs at the grain boundaries of the Si3N4 grains causingreduction of oxide phases. The density, hardness, bending strengths andfriction coefficient of the composites increased with the oxidation time ofthe Si3N4 powder.</jats:p>