Optimisation study for making aluminium nitride using an improved carbothermal reduction-nitridation process
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In order to obtain a high thermal conductivity, impurities such as oxygen and carbon should be removed from aluminiumnitride (AlN) during its synthesis using a carbothermal reduction-nitridation (CRN) process. In this study, AlN powders wereprepared under various conditions (1550-1750 oC, 0.5-4.0 hrs, nitrogen at 75-399 ml/min) using mixtures of alumina (Al2O3)and carbon black (C) at different molar ratios of 0.28 to 0.40. Residual carbon of the synthesized AlN powder was removedin a decarbonisation step using an electric furnace (600-900 oC, 0.5-4.0 hrs). The synthesis of AlN from alumina-carbon blackmixtures of Al2O3/C molar ratio of 0.31 (5% excess carbon black) at optimum conditions of 1700 oC for 3-4 hrs and airdecarbonisation (annealing) at 750 oC for 2 hrs produced product containing 385 ppm C and 0.62 wt% O2, lower than forcurrent commercial products.
Abstract
In order to obtain a high thermal conductivity, impurities such as oxygen and carbon should be removed from aluminiumnitride (AlN) during its synthesis using a carbothermal reduction-nitridation (CRN) process. In this study, AlN powders wereprepared under various conditions (1550-1750 oC, 0.5-4.0 hrs, nitrogen at 75-399 ml/min) using mixtures of alumina (Al2O3)and carbon black (C) at different molar ratios of 0.28 to 0.40. Residual carbon of the synthesized AlN powder was removedin a decarbonisation step using an electric furnace (600-900 oC, 0.5-4.0 hrs). The synthesis of AlN from alumina-carbon blackmixtures of Al2O3/C molar ratio of 0.31 (5% excess carbon black) at optimum conditions of 1700 oC for 3-4 hrs and airdecarbonisation (annealing) at 750 oC for 2 hrs produced product containing 385 ppm C and 0.62 wt% O2, lower than forcurrent commercial products.
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