Boron nitride nanotubes were synthesized by ball mill and annealing method,used boron oxide,nitrogen,ammonia as the main raw material.The products were analysized and characterized through XRD,SEM and TEM.The results showed that the diameter of nanotubes in porcelain boat were about 20～50nm and the length were up to 2～20μm,the diameter of nanotubes on ceramic substrate were about 10～20nm and the length were up to 2～20μm.The reactive mode and vegetation process were investigated by experiment.The conclusions were drawn from the experimental results that the boron oxide reacted with ammonia gas through gas-gas reaction and gas-solid reaction,and the boron nitride nanotubes were grown from the curly and connection of boron nitride nanosheets.
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