Size Effects in Micro- and Nanocarbon Added C/Si3N4 Composite Prepared by Hot Pressing

Csaba Balázsi; Filiz Çinar Şahin; O. Addemir; Zsolt Kasztovszky; Zsuzsanna Kövér; Ferenc Wéber

doi:10.4028/www.scientific.net/KEM.290.238

Paper Titles

R-Curves in Al₂O₃ - Al₂O₃/ZrO₂ Laminates
p.214

Contact Fatigue in Ceramic Laminated Composites
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Carbon Nanotubes Prepared by CVD
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Effect of Ion-Implantation on the Microstructure of Si₃N₄ Based Ceramics
p.234

Size Effects in Micro- and Nanocarbon Added C/Si₃N₄ Composite Prepared by Hot Pressing
p.238

Comparison of Silicon Nitrides with Carbon Additions Prepared by Two Different Sintering Methods
p.242

Effect of Rare Earth Oxide and Rare Earth-Alumina-Silica Glass on Mechanical Properties of Liquid Phase Sintered Alumina Ceramics
p.246

Mechanical Properties and Microstructure of α-SiAlON Based Cutting Tools
p.250

Influence of Alumina Platelets on the Mechanical Strength of Porous Zirconia Tape
p.254

HomeKey Engineering MaterialsKey Engineering Materials Vol. 290Size Effects in Micro- and Nanocarbon Added...

Size Effects in Micro- and Nanocarbon Added C/Si₃N₄ Composite Prepared by Hot Pressing

Abstract:

Silicon nitride based composites have been fabricated by carbon addition. Carbon black nanograins and graphite micrograins were used as second phase additions. Alumina and yttria were used as sintering aids. Mixing of powders was performed in a ball mill and for comparison in a high efficient attritor mill. For sintering the hot pressing technique has been applied. Experiments at 2 MPa uniaxial pressure have been performed. The Si/N mass fraction after sintering were determined by prompt gamma activation analysis (PGAA). The amount of carbon black and graphite introduced in the silicon nitride matrix increased the porosity and decreased the hardness and bending strength of composites. Lower modulus, and lower strength was obtained for composites with carbon black addition in comparison to graphite added samples. The microstructure of composites consisted mainly of alpha and beta silicon nitride. The formation of silicon carbide was observed only at 10 wt% carbon black addition.

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Periodical:

Key Engineering Materials (Volume 290)

Pages:

238-241

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.290.238

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Online since:

July 2005

Authors:

Csaba Balázsi, Filiz Çinar Şahin, O. Addemir, Zsolt Kasztovszky, Zsuzsanna Kövér, Ferenc Wéber

Keywords:

Carbon Black (CB), Graphite, Mechanical Property

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