DalianРPetrochemical Corporation of Chinese Petroleum , Dalian 116023 ,China)РAbstract : Globular nanometerγaluminum oxide powder was synthesized through detonation of aluminum nitrate. The experiРmental powder samples were heated from room temperature to 600 ℃、800 ℃、900 ℃、1000 ℃、1100 ℃and 1300 ℃ respectivelyРfor sintering , and then were analysed by means of XRD to investigate the crystal granularity of the powder samples sintered atРdifferent temperature. The curves of XRD manifested that with the sintering temperature rising ,the aluminum oxide changedРfromγ toδ, then toθ, and then toαand the grain of the nanometer aluminum oxide was refined. The most grain refinementРappeared at 800~1000 ℃.РKeywords :Detonation synthesis ;Nanometer aluminum oxide ;Crystal granularity ; Grain refinement
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