Communications - Scientific Letters of the University of Zilina 2004, 6(1):5-9 | DOI: 10.26552/com.C.2004.1.5-9

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

Csaba Balazsi¹, Ferenc Weber¹, Zsolt Kasztovszky²

¹ Ceramics and Refractory Metals Laboratory, Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, Budapest, Hungary

² Department of Nuclear Research, Institute of Isotope and Surface Chemistry, Chemical Research Center, Budapest, Hungary

Carbon black and graphite nano/micrograins and sintering additives (Al2O3 and Y2O3) were added to silicon nitride starting powder. 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 were added to carbon free silicon nitride batches. After dry pressing of rectangular bars sinter-HIP was applied. Structural, morphological and compositional analyses were performed on as-prepared samples. Bending strength and elastic modulus were found to be influenced by amount of carbon black and graphite introduced in silicon nitride matrix.

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Published: March 31, 2004  Show citation