Cryomilling and Characterization of Metal/Ceramic Powders


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Al/Fe2O3 thermite powders were prepared by cryomilling at liquid nitrogen temperature. The cryogenic temperature will restrain the mechanochemical reaction between alumina and iron oxide, leading to high reactivitive nanoscale powders. The size distribution of the powders was analyzed using laser particle size analyzer, and cryomilling was proved to be an effective method to prepare ultrafine powders. The differential scanning calorimetry (DSC) analysis indicated that the cryomilled powders get more fully-reacted, a larger proportion of solid-solid reaction and more heat release in the solid-liquid reaction, comparing with the powders milled at room temperaure. Furthermore, the reaction kinetics of Al-Fe2O3 system is analyzed by a model-free Starink method. The activation energy for solid-solid reaction of 2Al-Fe2O3 thermite mixture cryomilled for 40 min is determined as 250 kJ/mol. The alternating gradient magnetometer (AGM) analysis shows that long time milling evoked the thermit reaction between Al and Fe2O3, leading to the increase in saturation magnetization (Ms) and remanent magnetization (Mr).



Key Engineering Materials (Volumes 512-515)

Edited by:

Wei Pan and Jianghong Gong




Q. Hou et al., "Cryomilling and Characterization of Metal/Ceramic Powders", Key Engineering Materials, Vols. 512-515, pp. 127-131, 2012

Online since:

June 2012




[1] T. Ulrich: Energetic Materials; Particle Processing and Characterization (Wiley-Vch Verlag GmbH & Co. KGaA, Weinheim, 2005), p.245.

[2] A. Prakash, A.V. McCormick and M. R. Zachariah: Synthesis and reactivity of a super-reactive metastable intermolecular composite formaulation of Al/KMnO4, Adv. Mater. Vol. 17 (2005), p.900.


[3] J. Wang, A. Hu, J. Persic, et al: Thermal stability and reaction properties of passivated Al/CuO nano-thermite, J. Phys. Chem. Solids, Vol. 72 (2011), p.620.


[4] A. Prakash, A.V. McCormick and M. R. Zachariah: Tuning the reactivity of energetic nanoparticles by creation of a core−shell nanostructure, Chem. Mater. Vol. 16 (2004), p.1466.

[5] R.H. Fan, H.L. Lü, K.N. Sun, et al: Kinetics of thermite reaction in Al-Fe2O3 system, Thermochim. Acta. Vol. 440 (2006), p.129.


[6] J.L. Cheng, H.H. Hng, Y.W. Lee b, et al: Kinetic study of thermal- and impact-initiated reactions in Al–Fe2O3 nanothermite, Combust. Flame Vol. 157 (2010), p.2241.


[7] J. Mei, R.D. Halldearn and P. Xiao: Mechanisms of the aluminium-iron oxide thermite reaction, Scripta Mater, Vol. 41 (1999), p.541.


[8] J.L. Cheng, H.H. Hng, H.Y. Ng, et al: Synthesis and characterization of self-assembled nanoenergetic Al–Fe2O3 thermite system, J. Phys. Chem. Solids, Vol. 71 (2010), p.90.


[9] C. Badiola, M. Schoenitz, X.Y. Zhu, et al: Nanocomposite thermite powders prepared by cryomilling, J. Alloys. Compd. Vol. 488 (2009), p.386.


[10] Z.C. Shi, Z.D. Zhang, J.Y. Guo, et al: Magnetic multiresonance behavior of Fe@Al2O3 nanoembedments and microstructural evolution during mechanosynthesis, J. Alloys. Compd. Vol. 509 (2011) p.5600.


[11] A. Pommerin, C. Weidenthaler, F. Schuth, et al: Direct synthesis of pure complex aluminium hydrides by cryomilling, Scripta Mater. Vol. 62 (2010) p.576.


[12] F.S. Sun, P. Rojas, A. Zuniga, et al: Nanostructure in a Ti alloy processed using a cryomilling technique Mat. Sci. Eng. A Vol. 430 (2006), p.90.


[13] D.B. Witkin and E.J. Lavernia: Synthesis and mechanical behavior of nanostructured materials via cryomilling, Prog. Mater. Sci. Vol. 51 (2006), p.1.

[14] Y. Wang, W. Jiang, X.F. Zhang, et al: Energy release characteristics of impact-initiated energetic aluminum–magnesium mechanical alloy particles with nanometer-scale structure, Thermochim. Acta. 2011, (512): 233–239.


[15] M.J. Starink: A dislocation model for the minimum grain size obtainable by milling, Thermochim. Acta. Vol. 404 (2003), p.163.

[16] Z.L. Cui , L.F. Dong and C.C. Hao: Microstructure and magnetic property of nano-Fe particles prepared by hydrogen arc plasma, Mat. Sci. Eng. A Vol. 286 (2000) p.205.