Effect of grain boundary phase on the thermal conductivity of aluminium nitride ceramics
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- Chen, C.F., Perisse, M.E., Ramirez, A.F. et al. JOURNAL OF MATERIALS SCIENCE (1994) 29: 1595. doi:10.1007/BF00368932
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AIN with high thermal conductivity was fabricated by pressureless sintering with Y2O3 as the sintering aid. The thermal conductivity was observed to increase with sintering time (up to 8 h) at 1810 °C. The distribution of the sintering aid was identified as one of the major factors influencing the thermal conductivity in AIN. Non-uniform distribution of the grain boundary phase was found to be associated with a significant amount of porosity, resulting in the enhancement of phonon scattering and thereby lowering the thermal conductivity.