爆轰法制备纳米MnFe_2O_4粉体的实验研究

Experiment Research of Nano Manganese Ferrite Powders Prepared by Detonation Method

采用硝酸铁、硝酸锰作为主要氧化剂,油相作为可燃剂研制成两种不同氧平衡的乳化炸药,均成功地爆轰合成了纳米MnFe2O4粉体。用XRD表征粉末的物相结构,并比较了此两种不同氧平衡炸药所得产物成分的区别。根据DSC和XRD结果,分别在200℃(1 h)、260℃(1 h)、280℃(1 h)、360℃(40 min)和500℃(1 h)下对产物进行热处理,在280℃时得到了纯净的纳米MnFe2O4颗粒,并用TEM对其形貌进行了观察。实验结果表明,负氧平衡炸药的爆轰产物成分比零氧平衡炸药的爆轰产物相对纯净,280℃是一个合适的热处理温度。爆轰法具有合成方便快捷、后期热处理简单的优点。

Nanometer-sized MnFe2O4 powders were synthesized by detonation of two kinds of emulsion explosives with different oxygen balance （OB） values. The phase structure and the different components of the two samples obtained from the emulsion explosives were characterized and compared by X-ray diffraction （XRD）. According to the results of DSC and XRD, the samples were heated at 200 ℃ ,260 ℃ ,280 ℃ ,500 ℃ for 1 h and 360 ℃ for 40 min respectively. And at 280 ℃,pure nanometer-sized MnFe2O4 powders were obtained, their morphology was observed by transmission electron microscopy （TEM）. The results of the experiments indicate that detonation powders of the EE with negative OB value are relatively purer than those of the EE with zero OB value,and 280 ℃ is a suitable temperature for thermal treatment. Detonation method has the advantages of convenience and rapidness for nano-particles synthesis and simplity for post-thermal treatment.