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Paper Information

Journal:   JOURNAL OF APPLIED RESEARCHES IN CHEMISTRY (JARC)   winter 2019 , Volume 12 , Number 4 #f00656; Page(s) 47 To 58.

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

Author(s):  Hosseini Seyed Ghorban*, Javani Zahra, Sheikh Pour Ali, Fathollahi Manouchehr, Tavangar Rousta Saeed
* Malek Ashtar University of Technology, Tehran, Iran
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 μ m-Al/nm-CuO thermite mixture. However, the ignition of [μ m-Al95%+nm-Al5%]/nm-CuO, [μ m-Al80%+nm-Al20%]/nm-CuO, [μ m-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 [μ m-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.
Keyword(s): Al/CuO thermite,Nanoparticles,Ultrasonic mixing,Thermal analysis,Activation energy
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