Simultaneous study of the effects of nano-aluminum admixture and mixing process on the thermal behavior of the thermite mixture containing copper oxide

Subject Areas :

سید قربان حسینی ¹ , زهرا جوانی ² , علی شیخ پور ³ , منوچهر فتح الهی ⁴ , سعید توانگر روستا ⁵

1 - دانشیار شیمی معدنی، دانشگاه صنعتی مالک اشتر، تهران، ایران
2 - استادیار شیمی معدنی، دانشگاه آزاد اسلامی، واحد اسلامشهر، ایران
3 - دکتری شیمی معدنی، دانشگاه صنعتی مالک اشتر، تهران، ایران
4 - استادیار شیمی فیزیک، دانشگاه صنعتی مالک اشتر، تهران، ایران
5 - استادیار مهندسی شیمی، دانشگاه صنعتی مالک اشتر، تهران، ایران

Received: 2017-08-23 Accepted : 2018-08-23 Published : 2019-02-20

Keywords: nanoparticles, Thermal analysis, activation energy, Al/CuO thermite, Ultrasonic mixing,

Abstract :

In this work, the effects of the nano-aluminum additive and mixing process on the thermal behavior of Al/CuO systems were verified by thermal analysis and field emission scanning electron microscope (FE-SEM( methods. The DSC analysis results showed that there was no exothermic reaction for μm-Al/nm-CuO thermite mixture. However, the ignition of [μm-Al95%+nm-Al5%]/nm-CuO, [μm-Al80%+nm-Al20%]/nm-CuO, [μm-Al50%+nm-Al50%]/nm-CuO and nm-Al/nm-CuO took place at 600.9, 604.0, 605.5 and 608.4°C, respectively. Analysis of thermal behavior of these mixtures showed that the insensitivity and energy of the thermites increased with increasing quantity of nm-Al in [μm-Al+nm-Al]/nm-CuO formulation. Moreover, ultrasonic mixing decreased ignition temperature and increased heat of reaction of these ternary mixtures. This improvement in thermal properties was related to break up the agglomerates and better mixing quality by ultrasonic waves. In the next step, the reaction kinetics of physically mixed and ultrasonicated nm-Al/nm-CuO were investigated. The results revealed that sonicated nm-Al/nm-CuO thermite had lower activation energies than physically-mixed nm-Al/nm-CuO mixture. In addition, the ignition of ultrasonicated and physically-mixed nm-Al/nm-CuO mixtures occurred in one and two main steps, respectively.

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