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采用激光感应复合加热法 ,在真空条件下蒸发纯Zn原料制得纳米Zn粉 ,颗粒平均直径为 40nm。通过在空气中不同温度下对纳米Zn粉进行热处理 ,利用X射线衍射、透射电镜考察了热处理前后纳米Zn粉的相结构和形态变化。最后分别在Ar气和O2 气条件下 ,对纳米Zn粉进行差热分析 ,进一步研究了该纳米Zn粉的抗氧化性能。结果发现 :经过表面钝化处理的纳米Zn粉在低于熔点的温度不易完全氧化 ,具有较好的抗氧化性能。
Using laser induction composite heating method, pure Zn raw material was evaporated under vacuum to obtain Zn nanoparticle, the average particle diameter was 40 nm. The nanostructured Zn powders were heat-treated at different temperatures in the air. The phase structures and morphological changes of Zn powders before and after heat treatment were investigated by X-ray diffraction and transmission electron microscopy. At last, the differential thermal analysis of Zn powder was carried out under the conditions of Ar gas and O2 gas, respectively. The oxidation resistance of Zn powder was further studied. The results show that the surface passivated Zn powder can not be completely oxidized at the temperature lower than the melting point, and has good oxidation resistance.