Zeynep Taslicukur, Filiz Cinar Sahin, Gultekin Goller, Onuralp Yucel, Nilgun Kuskonmaz
May 31, 2013
Si 3 N 4 /C composites were prepared with carbon black and α-Si 3 N 4 powder by a novel sintering method, i.e. spark plasma sintering. SiC particles formed through reactions between the carbon particles and the SiO 2 on the Si 3 N 4 surface. The samples were sintered at 1650 °C for 5 minutes in a nitrogen atmosphere. The microstructure, phase composition, mechanical properties, and dielectric properties of the composites were investigated. The relative densities of the C/Si 3 N 4 composites decreased from 99 to 85% when the carbon black content increased from 0 to 20 wt.-%. Bending strength, hardness and dielectric properties were found to be influenced by the amount of carbon black introduced into the silicon nitride matrix.