Densification and Thermal Conductivity of AIN Doped with Y2O3, CaO, and Li2O |
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Authors: | Koji Watari Maria Cecilia Valecillos Manuel E. Brito Motohiro Toriyama Shuzo Kanzaki |
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Affiliation: | Department of Ceramics Science, National Industrial Research Institute of Nagoya, Nagoya 462, Japan |
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Abstract: | Small amounts of Li2O result in sintering in the AIN-Y2O3-CaO and AIN-CaO systems at firing temperatures <1600°C. The effect is ascribed to reduction of the liquidus temperature. Furthermore, Li2O is removed by volatization at temperatures from 1300° to 1600°C, and its content decreases several ppm from the initial 0.3 wt%. Li2O-doped AIN specimens containing Y2O3 and CaO additives are well densified by firing at 1600°C for 6 h, and their thermal conductivity is 135 W.m−1.K−1.The effect of Li2O addition on sintering and thermal conductivity also is discussed through thermo-dynamic considerations. |
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