Low Temperature Molten-Salt Synthesis and Characterization of Nanocrystalline Mullite Whiskers from Coal Gangue

Abstract:

The high purity mullite whiskers were successfully prepared via molten-salt synthesis (MSS) method using eutectic salt Na₂SO₄ as the flux at a relatively low temperature of 1100 °C for 3 h from a mixture of coal gangue and Al₂(SO₄)_3·18H₂O. The phase formation and microstructure of the as synthesized whiskers were characterized via differential scanning calorimetry (DSC), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The influence of Na₂SO₄ content on the morphology and size of the resulting mullite whiskers were also investigated in detail. The results indicate that the as fabricated mullite whiskers are dispersed uniformly with a diameter of 43-69 nm and a relatively large aspect ratio of more than 30.

• Periodical: Materials Science Forum (Volume 724)
• Pages: 41-44
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.724.41
• Online since: June 2012
• Authors: Xiu Lan Wu, Dan Zhao, Jian Feng Zhu, Qiang Ren
• Keywords: Coal Gangue, Microstructure, Molten Salt, Mullite Whiskers

References

[1] F. Gridi-Bennadji, D. Chateigner, G.D. Vita, P. Blanchart: J. Eur. Ceram. Soc. Vol. 29(2009), p.2177.

[2] B. Roy, P.A. Fuierer: J. Am. Ceram. Soc. Vol. 92 (2009) , p.520.

[3] S. Hashimoto, A. Yamaguchi: J. Ceram. Soc. Jpn. Vol. 112 (2004) , p.104.

[4] Emest M, Mcmuridie H F. Phase diagram forceramists, 1975 supplement Columbus: The American Ceramic Society Press, (1975), p.318.