1. Thermal conductivity of AlN ceramics sintered with CaF2 and YF3
- Author
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Qiao, Liang, Zhou, Heping, and Fu, Renli
- Subjects
- *
CERAMICS , *THERMAL properties , *SINTERING , *MICROSTRUCTURE , *OXYGEN - Abstract
Dense AlN ceramics with a thermal conductivity of 180W/m·K were obtained at the sintering temperature of 1750 °C using CaF2 and YF3 as additives. At temperatures below 1650 °C, the shrinkage of AlN ceramics is promoted by liquid (Ca,Y)F2 and Ca12Al14O32F2. Liquid CaYAlO4 mainly improves the densification of the sample when the sintering temperature increases to 1750 °C. The formation of liquid (Ca,Y)F2 at a relatively low temperature results in homogeneous YF3 distribution around the AlN particles, which benefits the removal of oxygen impurity in the AlN lattice, and thus a higher thermal conductivity. [Copyright &y& Elsevier]
- Published
- 2003
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