Effects of adding Y(NO3)3·6H2O on the phase change behavior and thermal conductivity of Aluminum Nitride ceramics
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The phase change behavior and thermal conductivity of Aluminum nitride (AlN) ceramics with Y(NO3)3·6H2O and Y2O3 asan additive were studied. Sintering was performed in the temperature of 1,900 oC for up to 3 h under a N2 atmosphere tooptimize the sintering conditions for each composition. The microstructure and assemblage of the secondary phase have asignificant effect on the final thermal conductivity of the sintered AlN. The mechanical property and thermal conductivity ofthe AlN composition of using the Y2O3 additive were improved by adding Y(NO3)3·6H2O, which decreased the porosity. At13.56 wt% Y(NO3)3·6H2O, the AlN ceramic exhibited the highest strength of 375 MPa, the highest hardness of 10.60 GPa, andthe highest thermal conductivity of 200.2 W/m·K.
Abstract
The phase change behavior and thermal conductivity of Aluminum nitride (AlN) ceramics with Y(NO3)3·6H2O and Y2O3 asan additive were studied. Sintering was performed in the temperature of 1,900 oC for up to 3 h under a N2 atmosphere tooptimize the sintering conditions for each composition. The microstructure and assemblage of the secondary phase have asignificant effect on the final thermal conductivity of the sintered AlN. The mechanical property and thermal conductivity ofthe AlN composition of using the Y2O3 additive were improved by adding Y(NO3)3·6H2O, which decreased the porosity. At13.56 wt% Y(NO3)3·6H2O, the AlN ceramic exhibited the highest strength of 375 MPa, the highest hardness of 10.60 GPa, andthe highest thermal conductivity of 200.2 W/m·K.
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