Synthesis of Cordierite by decomposition of metal nitrates on the surface of carbon black powder

Abstract

Cordierite precursor was obtained through a process, which involved the decomposition of metal nitrates on the surface of ultrafine carbon black powder between 100–300°C and the gasification of the carbon black at higher temperature in air. The average size of the particles, which were heat-treated at 700°C for 10h, is about 1020 nm, and the specific surface area is about 129 m²/g. The experimental results show that the ultra-fine particles of cordierite precursor can be produced by this process. The precursor powder was calcined at different temperatures. X-ray diffraction examination indicates that β-quartz is crystallized from the amorphous matrix around 850°C firstly and then MgO-Al₂O₃ spinel and α-cordierite appears. Above 1000°C, MgO-Al₂O₃ spinel and cristobalite disappear gradually and form an intermediate phase (sapphirine). At around 1300°C, the main phase is α-cordierite, and no other phase is detected.

Keywords

cordierite / carbon black powder / sapphirine / MgO-Al₂O₃ spinel

References

[1] Shi Z M, Liang K M, Zhang Q, . Effect of Cerium Addition on Phase Transformation and Microstructure of Cordierite Ceramics Prepared by Sol-gel Method. J. Mater Sci., 2001, 36(21): 5227-5230.

[2] Camerucci M A, Urretavizcaya G, Cavalieri A L. Sintering of Cordierite Based Materials. Ceram. Int., 2003, 29(2): 159-168.

[3] Ebadzadeh T, Lee W E. Processing-microstructure-property Relations in Mullite-cordierite Composites. J. Euro. Ceram. Sco., 1998, 18: 837-848.

[4] Pal D, Chakraborty A K, Suchitra S. The Synthesis, Characterization and Sintering of Sol-gel Derived Cordierite Ceramics for Electronic Applications. J. Mater. Sci., 1996, 31: 3955-4005.

[5] Shu Cai, Mingxia Xu, Cailou Zhou, . Fabrication of Cordierite Powder From Magnesium-aluminum Hydroxide and Sodium Silicate: Its Characteristics and Sintering. Mater. Res. Bull., 2002, 37: 133-1340.

[6] Oh J R, Imai H, Hirashima H. Effect of Al/Si Ratio on Crystallization of Cordierite Ceramics Prepared by the Sol-gel Method. J. Ceram. Soc. Jpn., 1997, 105(1): 43-47.

[7] Haase W, Sedda L. New Ideas and Proven Solutions for Kiln Furniture Made from Cordierite and Oxide Ceramics. Ceram. Forum. Int., 1999, 76(7): 9-14.

[8] Gonzalez-Velasco J R, Gutierrez-Ortiz M A, Ferret R, . Synthesis of Cordierite Monolithic Honeycomb by Solid State Reaction of Precursor Oxides. J. Mater Sci., 1999, 34(9): 1999-2002.

[9] Jia-feng Lei, Yu-bin Sun, Yong-xi Chen, . Sol-gel Synthesis of Normal Spinel LiMn₂O₄ and Its Characteristics. Journal of Wuhan University of Technology— Mater. Sci. Ed., 2002, 17(3): 1-4.

[10] Jiang Shusheng, Stangle Gregory C, Amarokoon Vasantha R W, . Synthesis of Yttria-stabilized Zirconia Nanopaticles by Decomposition of Metalnitrates Coated on Carboqn Powder. J. Mater. Res., 1996, 11(9): 2318-2324.

[11] McKee D W. Rare Earth Oxides as Carbon Oxidation Catalysts. Carbon, 1985, 23: 707-713.

[12] Gao-ke Zhang, Jin-dong Wu, Shi-xi Ouyiang, . Synthesis and X-ray Powder Diffraction Characterization of A New Niobate Crystal Ba₄Na₂VNb₉O₃₀. Journal of Wuhan University of Technology— Mater. Sci. Ed., 2002, 17(1): 33-34.

[13] Jian Liu, Jijian Cheng. The Crystallization Behavior of Cordierite. Journal of Inorganic Materials, 1993, 8(4): 423-427.