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EFFECTS OF HIGH ENERGY BALL MILLING ON AIN SNYTHESIS FROM Al2O3 BY CARBOTHERMAL REDUCTION NITRIDATION

Liu Xinkuan,Ma Mingliang,Zhou Jingen  
The influence of particle size of reactants after high energy ball milling on the AIN synthesis from alumina by carbothermal reduction was investigated.The crystallite size of alumina decreased to nanometer after high energy ball milling for a few minutes and varied slowly with prolonged milling,while the lattice strain increased with milling time.The carbothermal reduction nitridation reaction was promoted greatly after the milling of alumina for 20 hours.The results showed that the commenced temperature of AIN formation from alumina decreased to 1000and reaction rate increased markedly after high energy ball milling of reactants comparing with that of the raw reactants.It was believed that the mechanochemical effects,for example,the fining of crystallite size,crystal lattice distortion,defects and broken bands,etc.were the main cause for the promotion of the carbothermal reduction nitridation after the high energy ball milling.Though fining of the powders was the favorable element,it was not the single dominant element for the reaction.
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