Investigation of C/Si3N4 Nanocomposites

✍ Scribed by C. Balázsi; F. Wéber; P. Arató

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 630 KB
• Volume: 34
• Category: Article
• ISSN: 0933-5137
• DOI: 10.1002/mawe.200390070

✦ Synopsis

Abstract

Nanocrystalline carbon black and graphite micrograins have been added to silicon nitride starting powder and sintering additives (Al~2~O~3~ and Y~2~O~3~). 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.