Abstract
AlN ceramics synthesized by carbothermal reduction using the mechanical activated Al 2O 3 were investigated. The results show that, using the commercial Al 2O 3 not milled, the temperature was higher than 1600 °C when the carbothermal reduction reaction was completed, but, if the Al 2O 3 was milled by high-energy ball mill for 20 h, the carbothermal reduction reaction occurred below 1100 °C and completed thoroughly at 1250 °C, and all of Al 2O 3 transformed to AlN. These AlN powders can be sintered at about 1600 °C, and the mechanical properties of these AlN ceramics are as good as that of commercial AlN powders sintered at 1800 °C.
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