| In this paper AlON powder was prepared by carbothermal reduction method withγ-Al2O3 nano-powder and activated carbon powder as the raw material. First, the effect of ball-milling time of raw material, ratio of raw material, heating rate, sintering temperature and holding time on phase composition, particle size, specific surface area and micro-morphology of AlON powder were studed respectively. And the effect of milling technology of AlON powder on specific surface area and particle size distribution was also studied.The results show that as time increases from 12h to 24h the degree of refinement of particle is weakening gradually. The composition of synthesized powder is single-phase AlON when the content of activated carbon powder ranges from 5.4wt.% to 5.6wt.%. Heating rate is one of the key points that have great influence on the phase composition of synthesized powder. It is single-phase AlON that can be prepared as the rate is 10℃/min, while mixed phase of Al2O3 and AlON can be prepared as the rate is 20℃/min. Increasing sintering temperature is beneficial to carbothermal reduction reaction. But when the temperature is too high, AlON powder on the surface will be reduced to AlN. Too long holding time will also result in formation of AlN. When holding 30min,60min and 90min at 1750℃, only synthesized powder for 90min has AlN at its surface.According to the study on effect of milling technology of AlON powder we can know that the ball-milling speed and time have a great influence on specific surface area and particle size distribution at 250r/min. The powder for 36h is fine-grained and has a narrow distribution. |
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