Effect of High-Temperature Heat Treatment on Mechanical Property of Cr-Geopolymer Composite

Abstract:

Chromium powder reinforced geopolymer composite (Cr/geopolymer) was prepared in order to enhance its thermal conductivity and mechanical properties. The phase composition, microstructure and mechanical properties of Cr/geopolymer before and after heat treatment at 900, 1000, 1100 and 1200°C were investigated by the X–ray diffraction (XRD), scanning electron microscopy (SEM) and three–point bending test. With increasing heat treatment temperature from 900 to 1100°C, mechanical property of Cr/geopolymer increased gradually and at 1100°C flexural strength got the peak value, which was 325% higher than that of specimens without heat treatment. Cr/geopolymer treated at 900°C did not completely transform into crystalline phase, and many micro cracks around the chromium particles were observed. Cr/geopolymer treated at 1000–1100°C completely crystallized into leucite phase, and the metal chromium remained its original state. Meanwhile, most of the micro cracks were closed. When the temperature further increased to 1200°C, many visible defects were observed in Cr/geopolymer, and chromium oxide appeared in the interface of Cr/geopolymer, which had detrimental effect on the heat conduction and mechanical property of the composite.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 469-473
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.469
• Online since: November 2011
• Authors: Mei Rong Wang, Yi Zheng, De Chang Jia, Yu Zhou
• Keywords: Chromium Particles, Composite, Geopolymer, Heat Treatment, Mechanical Property

References

[1] J. Davidovits: Proceeding of 2002 geopolymer conference, Melbourne, Australia. (2002)

[2] J. Davidovits: Geopolymers: Journal of Thermal Analysis, Vol. 37 (1991), p.1633

[3] V.F.F. Barbosa and K.J.D. MacKenzie: Mater. Lett. Vol. 57 (2003), p.1477

[4] C.G. Papakonstantinou, P. Balaguru and R.E. Lyon: Composites. Part B. Vol. 32 (2001), 637–649.

[5] D.C. Comrie and W.M. Kriven: Ceram. Trans. Vol. 27–30 (2003), p.211

[6] W.M. Kriven, J. M. Bell and Gordon: Ceramic Engineering and Science Proceedings, Vol. 25 (2004): p.57

[7] V.F.F. Barbosa and K.J.D. MacKenzie: Mater. Res. Bull. Vol. 38 (2003), p.319

[8] J.L. Bell, P.E. Driemeyer and W.M. Kriven: J. Am. Ceram. Soc. Vol. 92 (2009), p.1

[9] J.L. Bell, P.E. Driemeyer and W.M. Kriven: J. Am. Ceram. Soc. Vol. 92 (2009), p.607

[10] P. Duxson and G.C. Lukey: J. Mater. Sci. Vol. 42 (2007), p.3044

[11] P. Duxson, G.C. Lukey, S.J. Jannie and V. Deventer: J. Non-Cryst. Solids. Vol. 353 (2007), p.2186

[12] Subaer and A. Riessen: J. Mater. Sci. Vol.42 (2007), p.3117

[13] D.S. Perera, O.Uchida, E.R. Vance and E.S. Finnie: J. Mater. Sci. Vol. 42 (2007), p.3099