The effect of several additives, such as CaC 2 , CaO, Y 2 O 3 , and C, on thermal conductivity of hot‐pressed AlN ceramics was investigated. The addition of CaC 2 reductant was found to be useful for achieving high thermal conductivity of 180 W/(m·K) at room temperature. The characterization of AlN ceramics with CaC 2 additive was performed by chemical analysis of Ca, C, and O and microstructural analysis using transmission electron microscopes equipped with an energy‐dispersive X‐ray analyzer and an electron energy loss spectrometer. The major influence on high thermal conductivity is the disappearance of a thermal barrier caused by oxygen impurities at the grain boundary.
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Kurokawa et al. (1988) studied this question.
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