Development of Novel Carbon Sources to Strengthen and Toughen Carbon-Containing Refractories

Yawei Li, Qinghu Wang

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science & Technology, Wuhan 430081/China

Revision 05.05.2016, 28.09.2016

Volume 9, Issue 1, Pages 80 - 88

Abstract

Two novel carbon sources were synthesized by hybridizing β-SiC whiskers or SiOx spheres on Expanded Graphite (EG) using silicon vapour deposition method. The synthesis was carried out in an enclosed crucible where the EG was placed above the silicon powders. The partial pressure and variety of Si-containing gaseous were controlled by adjusting the growth atmosphere and firing temperature. The Vapour-Solid (VS) mechanism is the predominant one for the growth of β-SiC whiskers and SiOx spheres. With addition of the above novel sources into Al2O3–C refractories, the mechanical properties increased dramatically, which was attributed to the enhanced interfacial bonding strength between EG and matrix.

Keywords

expanded graphite, β-SiC whiskers, SiOx spheres, Al2O3–C refractories

References

[1] Singh, V.; et al.: Graphene based materials: Past, present and future. Progress in Mater. Sci. 56 (2011) 1178–1271 [2] Yun, Y.S.; Bae, Y.H.; Kim, D.H.: Reinforcing effects of adding alkylated graphene oxide to polypropylene. Carbon 49 (2011) 3553– 3559 [3] Ramanathan, T.; et al: Functionalized graphene sheets for polymer nanocomposites. Nature Nanotechnology 3 (2008) 327–331 [4] Mahato, S.; Pratihar, S.K.; Behera, S.K.: Fabrication and properties of MgO–C refractories improved with expanded graphite. Ceramics Int. 40 (2014) 16535–16542 [5] Behera, S.K.; Mishra, B.: Strengthening of Al2O3-C slide gate plate refractories with expanded graphite. Ceramics Int. 41 (2015) 4254–4259 [6] Zhao, J.G.; Guo, Q.G.; Shi, J.L.: Carbon nanotube growth in the pores of expanded graphite by chemical vapour deposition. Carbon 47 (2009) 1747–1751 [7] Fan, Z.; Wu, C.; Chen, J.H.: Growth of carbon nanotubes on the surface of carbon fibers. Carbon 46 (2008) 365–389 [8] Lee, D.H.; et al.: Versatile carbon hybrid films composed of vertical carbon nanotubes grown on mechanically compliant graphene films. Adv. Mater. 22 (2010) 1247–1252 [9] Ding, J.; et al.: Novel synthesis and characterization of silicon carbide nanowires on graphite flakes. Ceramics Int. 40 (2014) 4001– 4007 [10] Wang, D.; et al.: Silicon carbide nanowires grown on graphene sheets. Ceramics Int. 41 (2015) 5473–5477 [11] Wu, G.S.; et al.: Preparation of SiO2-GO hybrid nanoparticles and the thermal properties of methylphenylsilicone resins/SiO2–GO nanocomposites. Thermochimica Acta 613 (2015) 77–86 [12] Li, Y.W.; et al.: The evolution of the physical Properties and microstructure of Al2O3-ZrO2-C slide gate at elevated temperatures. Proc. of the Unified Int. Technical Conf. on Refractories, Florida (USA). Unitecr, 2005; 566–570 [13] Li, Y.W.; et al.: Microstructures and properties of carbon Refractories for blast furnaces with SiO2 and Al additions. Metall. Mater. Trans. A 41 (2010) 2085–2092 [14] Jiang, W.; et al.: Thermal analysis of the oxidation of natural graphite-effect of particle size. Thermochimica Acta 351 (2000) 85–93 [15] Su, C.L.; Loh, K.P.: Carbocatalysts: Graphene oxide and its derivatives. Accounts of Chem. Res. 46 (2013) 2275–2285 [16] Sengupta, R.; Bhattacharya, M.; Bandyopadhyay, S.: A review on the mechanical and electrical properties of graphite and modified graphite reinforced polymer composites. Progress in Polymer Sci. 36 (2011) 638– 670 [17] Jin, G.Q.; Guo, X.Y.: Synthesis and characterization of mesoporous silicon carbide. Microporous and Mesoporous Mater. 60 (2003) 207–212 [18] Liu, Z.C.; et al.: Low temperature formation of nanocrystalline β-SiC with high surface area and mesoporosity via reaction of mesoporous carbon and silicon powder. Microporous and Mesoporous Mater. 82 (2005) 137–145 [19] Wang, Q.H.; et al.: Effect of reactivity and porous structure of expanded graphite (EG) on microstructure and properties of Al2O3-C refractories. J. of Alloys and Compounds 645 (2015) 388–397 [20] Zhu, T.B.; et al.: Microstructure and mechanical properties of MgO–C refractories containing expanded graphite. Ceramics Int. 39 (2013) 4529–4537

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