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含能材料  2010 

二氧化碳GAS法重结晶细化HMX成核速率研究

DOI: 10.3969/j.issn.1006-9941.2010.05.012

Keywords: 物理化学,CO2气体抗溶剂法(GAS),HMX,成核,晶体生长,粒径分布

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Abstract:

采用CO2气体抗溶剂法(GAS)对奥克托今(HMX)重结晶细化过程进行了研究。运用紫外分光光度计测定了压力为10～35MPa条件下，HMX在CO2-丙酮体系中的过饱和度，进而利用成核速率方程计算得到了HMX的成核速率。利用扫描电子显微镜(SEM)表征了HMX样品形貌，通过扫描电镜照片统计分析，得到了HMX粒子平均粒度及粒径分布。结果表明，随着压力的升高，HMX在CO2-丙酮体系中过饱和度逐渐增加，表现出非常高的成核速率，可以达到1024数量级。不同压力下所得HMX粒子形貌、粒度及粒径分布也有较大差别。从成核速率角度进行理论分析，表明高压条件(35MPa)相对低压条件(5～15MPa)而言，能量更多的消耗在成核阶段，从而有利于形成形貌规整、粒度小、粒径分布较窄的HMX颗粒。

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