ANFO炸药的微观结构

Microstructures of ANFO Explosives

为了更好地认识铵油(ANFO)炸药的微观结构,采用扫描电镜(SEM)和密度测试方法,对4种不同状态硝酸铵(AN)和燃料油组成的ANFO炸药的微观结构进行表征,采用切片技术观察ANFO炸药颗粒的内部微观结构。结果表明,未膨化ANFO炸药颗粒内部及外部的孔洞和裂纹很少,颗粒表面比膨化ANFO炸药表面光滑;膨化ANFO炸药颗粒表面存在大量孔洞、裂纹和突起,表面凹凸不平,颗粒内部存在大量毛孔和孪晶;EANFO-34样品在颗粒孔洞和不规则方面具有一些鲜明特征,颗粒内部也存在大量孔洞。研究也表明,膨化AN颗粒的晶体生长并未完成。

In order to understand the microstructure of ammonium nitrate（AN）-oil explosives, scanning electric microscopy （SEM） and density measuring method are used to characterize the microstructures of ANFO explosives made from four different states AN and fuel oil. A section technique is used for the first time to observe the intragranular microstructure in ANFO explosives particles. The results show that ANFO explosive made from unexpanded AN particles has few pores and cracks inside and outside of the particles, its surface is more smoother than expanded ANFO explosives particles. While expanded ANFO explosives particles have many holes, cracks and protuberances, their particle surface reveals accident, there are many voids and twin crystals lying in the interior of expanded ANFO particles. EANFO-34 sample has some marke.d characteristics in pores and scrambling, many holes also exist inside particles. The results also show that the crystal growth of expanded AN particles is not completed.