This thesis seeks to examine the effect on the thermal conductivity of alumina composites with the addition of nano-carbons such as carbon nanotubes, graphene, and nanodiamond. However, does alumina react with carbon at high-temperature sintering with plasma? The TEM observation will be used to explain the microstructure and heat transfer mechanism of the nanocomposite.
Raman spectra indicate that the graphene becomes crystal defective in the nanocomposite after PECS sintering. That means the crystallinity is affected by the sintering process. However, we cannot rule out that these characteristic peaks are affected by carbon infiltration from the graphite die. More relevant experiments should be carried out to verify.
The thermal conductivity of two-phase composites many theoretical models. In this thesis, we use an envelope composing of upper bound and lower bound models. However, the thermal resistance concept maybe imports to describe all the experimental data.
The unexpected results of this work show that the use of nanodiamonds as second phases in alumina-based composites presents fascinating possible applications, such as wear-resistant and high temperature resistant structural components, etc.
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