Impedance Changes and Carbon Stability during the Heat Treatment of Si3N4–Carbon Composites

Balazs Fényi; Norbert Hegman; K. Szemmelveisz; Csaba Balázsi

doi:10.4028/www.scientific.net/KEM.409.365

Paper Titles

Strength Degradation Flaws in the Liquid-Phase-Sintered SiC Based Ceramics
p.350

Observation of Thermophysical and Tribological Properties of CNT Reinforced Si₃N₄
p.354

Low Temperature Failure of Fe₇₆Ni₂Si₉B₁₃ Compacted from Amorphous Glass Powder
p.358

The Compressibility Behaviour of a New Generation of Coated Metal/Ceramic Composite Powders
p.362

Impedance Changes and Carbon Stability during the Heat Treatment of Si₃N₄–Carbon Composites
p.365

The Milling Time Effect on Sintering Kinetics of Silicon Nitride Based Composites
p.369

Creep of FINEMET Alloy at Amorphous to Nanocrystalline Transition
p.373

Fracture Toughness of Si₃N₄ Based Ceramics with Rare-Earth Oxide Sintering Additives
p.377

Chemical Methods for Scanning Electron Microscope Characterization of Non-Oxide Ceramics and Composites
p.382

HomeKey Engineering MaterialsKey Engineering Materials Vol. 409Impedance Changes and Carbon Stability during the...

Impedance Changes and Carbon Stability during the Heat Treatment of Si₃N₄–Carbon Composites

Abstract:

Electrical properties of the insulator silicon nitride ceramics may be improved by addition of electrical conductive parts. The conductive carbon parts were mixed with the base ceramic matrix to form a percolation network. Electrical current can flow through the ceramic by using the connected carbon channels. In air atmosphere however, the carbon can oxidize and burn out. Heat treatments were performed to observe the carbon degradation in composites in atmosphere. As resulted, the carbon exhaust started at 400°C from surface and finished above 750°C. Electrical measurements showed the conductor-insulator transformation. Thermo-gravimetric measurements suggested that some carbon inclusion still remained in isolated closed porosities.

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Periodical:

Key Engineering Materials (Volume 409)

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365-368

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https://doi.org/10.4028/www.scientific.net/KEM.409.365

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Online since:

March 2009

Authors:

Balazs Fényi, Norbert Hegman, K. Szemmelveisz, Csaba Balázsi

Keywords:

Carbon Nanotube (CN), Carbon Stability, Impedance

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