Preparation of long alumina fibers by sol-gel method using tartaric acid

Abstract

Long alumina fibers were prepared by sol-gel method. The spinning sol was obtained by mixing aluminum nitrate, tartaric acid, and polyvinylpyrrolidone with a mass ratio of 10:3:1.5. Thermogravimetry-differential scanning calorimetry (TG-DSC), Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to characterize the properties of the gel and ceramic fibers. A little of α-Al₂O₃ phase is observed in the alumina precursor gel fibers sintered at 1273 K. The fibers with a uniform diameter can be obtained when sintered at 1473 K, and its main phase is also indentified as α-Al₂O₃.

Keywords

alumina / fibers / sol-gel process / polyvinylpyrrolidone

References

[1] Zhu L.H., Huang Q.W., Liu W. Synthesis of plate-like α-Al₂O₃ single-crystal particles in NaCl-KCl flux using Al(OH)₃ powders as starting materials. Ceram. Int., 2008, 34(7): 1729.

[2] Venkatesh R., Ramanan S.R. Influence of processing variables on the microstructure of sol-gel spun alumina fibres. Mater. Lett., 2002, 55(3): 189.

[3] Sedaghat A., Taheri-Nassaj E., Naghizadeh R. An alumina mat with a nano microstructure prepared by centrifugal spinning method. J. Non Cryst. Solids, 2006, 352(26–27): 2818.

[4] Zhang Y.B., Ding Y.P., Gao J.Q., Yang J.F. Mullite fibres prepared by sol-gel method using polyvinyl butyral. J. Eur. Ceram. Soc., 2009, 29(6): 1101.

[5] Chandradass J., Balasubramanian M. Sol-gel processing of alumina fibres. J. Mater. Process. Technol., 2006, 173, 275.

[6] Shojaie-Bahaabad M., Taheri-Nassaj E., Naghizadeh R. An alumina-YAG nanostructured fiber prepared from an aqueous sol-gel precursor: Preparation, rheological behavior and spinnability. Ceram. Int., 2008, 34(8): 1893.

[7] Desroches S., Dayde S., Berthon G. Aluminum speciation studies in biological fluids: Part 6. Quantitative investigation of aluminum(III)-tartrate complex equilibria and their potential implications for aluminum metabolism and toxicity. J. Inorg. Biochem., 2000, 81(4): 301.

[8] Bojinov M., Kanazirski I., Girginov A. Barrier oxide film VS salt layer formation on bismuth in tartaric acid solutions. Electrochim. Acta, 1995, 40(5): 591.

[9] Wang H.S., Qiao X.L., Chen J.G., et al. Mechanisms of PVP in the preparation of silver nanoparticles. Mater. Chem. Phys., 2005, 94(2–3): 449.

[10] Leivo J., Lindén M., Ritola M., et al. Influence of thermal treatment conditions on the formation of phase-pure mullite derived from a nanoparticulate aluminosilicate precursor. Mater. Chem. Phys., 2009, 115(1): 56.

[11] Li J., Pan Y.B., Xiang C.S., et al. Low temperature synthesis of ultrafine α-Al2O3 powder by a simple aqueous sol-gel process. Ceram. Int., 2006, 32(5): 587.

[12] Padmaj P., Anilkumar G.M., Mukundan P., et al. Characterisation of stoichiometric sol-gel mullite by Fourier transform infrared spectroscopy. Int. J. Inorg. Mater., 2001, 3(7): 693.

[13] Nordahl C.S., Messing G.L. Thermal analysis of phase transformation kinetics in α-Al₂O₃ seeded boehmite and Γ-Al₂O₃. Thermochim. Acta, 1998, 318(1–2): 187.

[14] Nordahl C.S., Messing G.L. Sintering of α-Al₂O₃-seeded nanocrystalline Γ-Al₂O₃ powders. J. Eur. Ceram. Soc., 2002, 22(4): 415.

[15] Li J.G., Sun X.D. Synthesis and sintering behavior of a nanocrystalline α-alumina powder. Acta Mater., 2000, 48(12): 3103.