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Thermal conductivity of AlN ceramics sintered with CaF2 and YF3
- Source :
-
Ceramics International . Dec2003, Vol. 29 Issue 8, p893. 4p. - Publication Year :
- 2003
-
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]
- Subjects :
- *CERAMICS
*THERMAL properties
*SINTERING
*MICROSTRUCTURE
*OXYGEN
Subjects
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 29
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 11255716
- Full Text :
- https://doi.org/10.1016/S0272-8842(03)00033-6