Electrical and thermal conductivity of CNT/alumina‐nanocomposite ceramics

In the present work, carbon nanotube (CNT)‐reinforced alumina nanocomposite ceramics were investigated about their electrical and, for the first time in such detail, thermal conductivity. Therefore, two different alumina powders with varying CNT‐contents were processed by pressureless sintering and...

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Published in:International journal of ceramic engineering & science 2023-01, Vol.5 (1), p.n/a
Main Authors: Bechteler, Christian, Machuj, Lisa, Hebendanz, Kilian, Rübling, Achim, Girmscheid, Ralf, Kühl, Hannes
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Carbon
carbon nanotube
Carbon nanotubes
Ceramics
Crystal structure
electrical properties
Electrical resistivity
Grain boundaries
Grain size
Grain structure
Heat conductivity
Heat transfer
Hot pressing
Influence
Investigations
Loose powder sintering
Measurement techniques
Mechanical properties
nanocomposite
Nanocomposites
Percolation
Porosity
Porous materials
Sintering (powder metallurgy)
Thermal conductivity
thermal properties
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description In the present work, carbon nanotube (CNT)‐reinforced alumina nanocomposite ceramics were investigated about their electrical and, for the first time in such detail, thermal conductivity. Therefore, two different alumina powders with varying CNT‐contents were processed by pressureless sintering and hot pressing to achieve CNT/alumina composite ceramics with varying porosity and CNT‐content between 0 and 5 wt.% CNTs. A significant influence of the grain size on percolation threshold of the electrical conductivity was detected. The coarser CT 3000 SG‐based ceramic showed a threshold of
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Unlike electrical conductivity, thermal conductivity decreases significantly with increasing CNT‐content. As two influences, CNT‐content and porosity, interact, each of them was analyzed separately in order to measure the isolated influence of CNT‐content on thermal conductivity at constant porosity. It was shown, that thermal conductivity decreases considerably with increasing CNT‐content even at constant porosity, because of a disturbed crystal structure due to a finer grain structure with more grain boundaries. This behavior is contrary to the expected, and sometimes reported, effect of CNTs. The combination of an increasing CNT‐content and the related increase in porosity causes a strongly decreasing thermal conductivity of the material from 35 W/m∙K for pure alumina to 10 W/m∙K for alumina with 5 wt.% CNTs. 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subjects Alumina
Aluminum oxide
Carbon
carbon nanotube
Carbon nanotubes
Ceramics
Crystal structure
electrical properties
Electrical resistivity
Grain boundaries
Grain size
Grain structure
Heat conductivity
Heat transfer
Hot pressing
Influence
Investigations
Loose powder sintering
Measurement techniques
Mechanical properties
nanocomposite
Nanocomposites
Percolation
Porosity
Porous materials
Sintering (powder metallurgy)
Thermal conductivity
thermal properties
title Electrical and thermal conductivity of CNT/alumina‐nanocomposite ceramics
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