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Alkali resistance enhancement of basalt fibers by hydrated zirconia films formed by the sol-gel process

Published online by Cambridge University Press:  03 March 2011

T. H. Jung  and
R. V. Subramanian
T. H. Jung
Affiliation:
Department of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164–2920
R. V. Subramanian*
Affiliation:
Department of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164–2920
*
a)Author to whom correspondence should be addressed.
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Abstract

Basalt fibers were dip-coated in zirconium-n-propoxide, unstabilized or stabilized by chelation with ethyl acetoacetate. The thermal transformations of the hydrated zirconia coatings formed were investigated by dynamic x-ray diffraction and differential thermal analysis. The changes in the surface chemical compositions of coated and uncoated fibers, following alkali immersion extending to 90 days, were characterized by EDXA and IR spectral analysis. Fiber strengths were also measured after immersion in 0.1 M NaOH for different durations. It was found that the transition of the amorphous zirconia coating to the tetragonal crystalline phase is shifted to higher temperatures by chelation of the zirconium alkoxide. Alkali corrosion of the uncoated basalt fibers results in dissolution of the oxides of Si, Al, and Ca, and the formation of unsoluble hydroxides of Fe, Mg, and Ti from the chemical constituents of basalt. These reactions are suppressed by the protective zirconia coating on basalt fibers formed by the unstabilized zirconium alkoxide. However, the coating formed from zirconium propoxide stabilized by ethyl acetoacetate does not form an effective barrier against alkali attack since it is easily detached from the fiber surface during alkali immersion. The tensile strength of uncoated basalt fibers is drastically reduced by alkali attack. But the strength of zirconia-coated basalt fibers is maintained even after 90 days of alkali immersion. The vastly improved alkaline durability of the coated fibers shows the potential of zirconia-coated basalt fibers for cement reinforcement.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 4 , April 1994 , pp. 1006 - 1013
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

1Subramanian, R. V., Austin, H. F., and Wang, T. J. Y., SAMPE Quarterly 8 (4), 1 (1977).Google Scholar
2Subramanian, R. V. and Shu, K. H., in Molecular Characterization of Composite Interfaces, edited by Ishida, H. and Kumar, G. (Plenum, New York, 1985), pp. 205–236.Google Scholar
3Subramanian, R. V., in Handbook of Reinforcements for Plastics, edited by Milewski, J. W. and Katz, H. S. (Van Nostrand Reinhold, New York, 1987), p. 287.Google Scholar
4Park, J. M. and Subramanian, R. V., J. Adhesion Sci. Technol. 5, 459 (1991).CrossRefGoogle Scholar
5Subramanian, R. V. and Austin, H. F., U. S. Patent No. 4149866 (1979).Google Scholar
6Jung, T. H. and Subramanian, R. V., Scripta Metall. Mater. 28, 527 (1993).CrossRefGoogle Scholar
7Velpari, V., Ramachandran, B. E., Pai, B. C., Balasubramanian, N., and Bhaskaran, T. A., J. Mater. Sci. 15, 1579 (1980).CrossRefGoogle Scholar
8Ramachandran, B. E., Velpari, V., and Balasubramanian, N., J. Mater. Sci. 16, 3393 (1981).CrossRefGoogle Scholar
9Velpari, V., Ph.D. Thesis, Washington State University (1987).Google Scholar
10Majumdar, A. J. and Nurse, R. W., Glass Fiber Reinforced Cement (Building Research Establishment, Watford, U.K., CP 79/74, Aug. 1974).Google Scholar
11Proctor, B. A. and Yale, B., Philos. Trans. R. Soc. London, Ser. A 294, 427 (1980).Google Scholar
12Paul, A., J. Mater. Sci. 12, 2246 (1977).CrossRefGoogle Scholar
13Larner, L. J., Speakman, K., and Majumdar, A. J., J. Non-Cryst. Solids 20, 43 (1976).CrossRefGoogle Scholar
14Newton, R. G., Glass Technology 126 (1), 21 (1985).Google Scholar
15Tagagi, H., Kokubo, T., and Tashiro, M., Yogyo Kyokai-shi 89, 243 (1981).CrossRefGoogle Scholar
16Nogami, M., J. Non-Cryst. Solids 69, 415 (1985).CrossRefGoogle Scholar
17Maddalena, A., Guglielmi, M., Gottardi, V., and Raccanelli, A., J. Non-Cryst. Solids 82, 356 (1986).CrossRefGoogle Scholar
18Yamada, K., Chow, T. Y., Horihata, T., and Nagata, M., J. Non-Cryst. Solids 100, 316 (1988).CrossRefGoogle Scholar
19De, G., Chatterjee, A., and Ganguli, D., J. Mater. Sci. Lett. 9, 845 (1990).CrossRefGoogle Scholar
20Subramanian, R. V. and Velpari, V., American Ceramic Society, 39th Pacific Coast Regional Meeting, Oct. 22, 1986, Seattle, WA.Google Scholar
21Jung, T. H., M. S. Thesis, Washington State University (1988).Google Scholar
22Jung, T. H., Ph.D. Thesis, Washington State University (1992).Google Scholar
23Mazdiyasni, K. S., Lynch, C. T., and Smith, J. S., J. Am. Ceram. Soc. 50, 532 (1967).CrossRefGoogle Scholar
24Paul, A. and Youssefi, A., J. Mater. Sci. 13, 97 (1978).CrossRefGoogle Scholar
25Izumi, K., Mrakami, M., Deguchi, T., and Morita, A., J. Am. Ceram. Soc. 72, 1465 (1989).CrossRefGoogle Scholar
26Maddalena, A., Guglielmi, M., Raccanelli, A., and Colombo, P., J. Non-Cryst. Solids 100, 461 (1988).CrossRefGoogle Scholar