Preparation of Lightweight Mullite-Anorthite Refractories by Different Routes

Abstract:

Mullite-anorthite as a kind of lightweight refractory combines the low thermal conductivity of anorthite and the excellent thermal properties of mullite. In this work, mullite beads and calcium aluminate cement was used as the main component and bonding agent. The lightweight mullite-anorthite refractory was prepared by difference routes including foaming method, addition of pore-forming agent and sacrificial template method. The phase composition, bulk density, apparent porosity and thermal conductivity of samples were compared. The results showed that anorthite formed as the consequence of the reaction of cement and mullite. Extra addition of foam, cornstarch and polyurethane sponge could decrease the bulk density of samples. The pore size of samples prepared by foaming method was the smallest. The apparent porosity of samples obtained by sacrificial template method was largest, but the thermal conductivity was the highest due to the open pores.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 150-155
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.150
• Online since: August 2018
• Authors: Dan Yang Zhang, Ling Qu, Wen Jie Yuan*
• Keywords: Anorthite, Lightweight Materials, Mullite

References

[1] W Ni, HX Wang, Development of anorthite bonded light weight mullite refractory bricks, Refractories. 2(1999) 76-78.

[2] WX Dong, Feldspar minerals and their applications, Chemical Industry Press, China, (2010).

[3] WX Dong, QF Bao, XY Gu, et al. Effects of preparation of process on mechanical properties of anorthite/mullite compositions, Chinese Journal of Ceramic. 32(2001) 216-220.

[4] H Yan, XT Wang, ZF Wang, et al. Effexts of mineral composition on phase formation process of anorthite-mullite composite materials, Material for Mechaine Engneering. 40(2016) 37-41.

[5] H Li, QY Du, GC Li, et al. Preparation of porous cordierite ceramics by starch consolidation, J Synth Crys. 42(2013) 1936-(1939).

[6] H Yan, XT Wang, Y Ma, et al. Preparation of anorthite-mullite lightweight refractories by various starches in-situ consolidation, Refractories. 50(2016) 363-366.

[7] M Potoczek. Gelcasting of alumina foams using agarose solutions, Ceram. Int. 34(2008) 661-667.

DOI: 10.1016/j.ceramint.2007.02.001

[8] L Gong, Y Wang, X Cheng, et al. Thermal conductivity of highly porous mullite materials, Int J Heat Mass Tran. 67(2013) 253-259.

DOI: 10.1016/j.ijheatmasstransfer.2013.08.008

[9] L Hu, Y Zhang, S Zhang, et al. A novel decompress-freezing process for ultra-high porosity ZrO2 ceramics, Mater Lett. 82(2012) 152-155.

DOI: 10.1016/j.matlet.2012.05.081

[10] Y Li, X Cheng, L Gong, et al. Fabrication and characterization of anorthite foam ceramics having low thermal conductivity, J. Eur. Ceram. Soc. 35(2015) 267-275.

DOI: 10.1016/j.jeurceramsoc.2014.08.045

[11] E Gregorová, W Pabst, T Uhlířová, et al. Processing, microstructure and elastic properties of mullite-based ceramic foams prepared by direct foaming with wheat flour, J. Eur. Ceram. Soc. 36(2016) 109-120.

DOI: 10.1016/j.jeurceramsoc.2015.09.028

[12] CS Huang. Preparation and performance of porous light weight mullite ceramic, Tianjin univ. (2012).

[13] YM Lin, CW Li, CA Wang. Effects of Mullite Content on the Properties and Microstructure of Porous Anorthite/Mullite Composite Ceramics, J. Inorg. Mater. 26(2011) 1095-1100.

DOI: 10.3724/sp.j.1077.2011.01095

[14] SG Li, F Sun, ZH Fan, et al. Research Progresses on Preparation Methods of Porous Mullite, China Ceramics. 8(2015) 6-9.

[15] JM Tulliani, L Montanaro, TJ Bell, et al. Semiclosed-Cell Mullite Foams: Preparation and Macro- and Micromechanical Characterization, J. Am. Ceram. Soc. 2010,82(4) 961-968.

DOI: 10.1111/j.1151-2916.1999.tb01860.x

[16] G Liu, Y Yan. Research Progress of Porous Ceramics Produced by Freeze Casting Technique, J. Inorg. Mater. 2014,29(6) 571-583.

[17] Z Wang, P Feng, X Wang, et al. Fabrication and properties of freeze-cast mullite foams derived from coal-series kaolin, Ceram. Int. 2016,42(10) 12414-12421.

DOI: 10.1016/j.ceramint.2016.04.181