Events and reaction mechanisms during the synthesis of an Al2O3-TiB2 nanocomposite via high energy ball milling

doi:10.1007/s11705-013-1325-6

Front Chem Sci Eng

2013, Vol. 7

Issue (2) : 123-129 https://doi.org/10.1007/s11705-013-1325-6

RESEARCH ARTICLE

Events and reaction mechanisms during the synthesis of an Al₂O₃-TiB₂ nanocomposite via high energy ball milling

M. ABDELLAHI¹(

), M. ZAKERI², H. BAHMANPOUR³

1. Materials Engineering Department, Islamic Azad University, Saveh Branch, Saveh Iran; 2. Ceramic Department, Materials and Energy Research Center, Tehran 31787/316, Iran; 3. Chemical engineering and Materials Science Department, University of California, Davis, CA 95616, USA

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Abstract

An Al₂O₃-TiB₂ nanocomposite was successfully synthesized by the high energy ball milling of Al, B₂O₃ and TiO₂. The structures of the powdered particles formed at different milling times were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Thermodynamic calculations showed that the composite formed in two steps via highly exothermic mechanically induced self-sustaining reactions (MSRs). The composite started to form at milling times of 9–10 h but the reaction was not complete. The remaining starting materials were consumed by increasing the milling time to 15 h. The XRD patterns of the annealed powders showed that aluminum borate is one of the intermediate products and that it is consumed at higher temperatures. Heat treatment of the 6-h milled sample at 1100^°C led to a complete formation of the composite. Increasing the milling time to 15 h led to a refining of the crystallite sizes. A nanocomposite powder with a mean crystallite size of 35–40 nm was obtained after milling for 15 h.

Keywords ball milling nanocomposite Al₂O₃ TiB₂

Corresponding Author(s): ABDELLAHI M.,Email:info@abdellahi.net

Issue Date: 05 June 2013

Cite this article:

M. ABDELLAHI,M. ZAKERI,H. BAHMANPOUR. Events and reaction mechanisms during the synthesis of an Al₂O₃-TiB₂ nanocomposite via high energy ball milling[J]. Front Chem Sci Eng, 2013, 7(2): 123-129.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1325-6
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I2/123

Fig.1 XRD patterns of the starting material powder and powders milled for various times

Fig.2 XRD patterns of the powders milled for 9-12 h

Fig.3 Vial temperature versus milling time

Fig.4 Effect of the milling time on the intensity of the aluminum peak (2 = 38.5°)

Fig.5 XRD patterns of the 6-h milled powders after heat treatment at 800°C and 1100°C for 2 h

Fig.6 SEM micrographs of the milled powders: (a) 3, (b) 9 and (c) 10 h

Tab.1 Mean crystallite sizes of the milled powders at various milling times

Fig.7 TEM bright field images of the 15-h milled product

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