Microstructure and thermal conductivity of AIN ceramics containing additives

  title={Microstructure and thermal conductivity of AIN ceramics containing additives},
  author={S. Du and Longqiao Gao and F. Li and Z. Liu and Young Jei-Oh},
  journal={Journal of Materials Science},
The effect on AIN ceramic of the addition of Y2O3, Yb2O3, Er2O3 and CaO were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermal conductivity measurements. The effect of grain boundary segregation and second phase distribution on the thermal conductivity are discussed. The Er2O3-CaO-and the Yb2O3-CaO-AIN ceramics have a higher thermal conductivity than the CaO-and the Y2O3-CaO-AIN ceramics. This is explained on the basis of the free energy… Expand
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