Ca-SiAlON Glasses: Effects of Fluorine on Glass Formation and Properties


Article Preview

Oxynitride glasses are effectively alumino-silicate glasses in which nitrogen substitutes for oxygen in the glass network, resulting in increases in glass transition and softening temperatures, viscosities (by two to three orders of magnitude), elastic moduli and microhardness. Calcium alumino-silicate glasses containing fluorine are known to have useful characteristics as potential bioactive materials. Therefore, the combination of both nitrogen and fluorine additions to these glasses may give useful bioglasses with enhanced mechanical stability. This paper gives a review of oxynitride glasses and reports glass formation and evaluation of glass properties in the Ca-Si-Al-O-N-F system. Within the previously defined glass forming region in the Ca-Si-Al-O-N system, homogeneous, dense glasses are formed. However, addition of fluorine affects glass formation and reactivity of the glass melts and can lead to fluorine loss as SiF4, but also nitrogen loss, and cause bubble formation. At high fluorine and high Ca contents under conditions when Ca- F bonding is favoured, CaF2 crystals precipitate in the glass. It was found that fluorine expands the glass forming region of Ca-Sialon system and facilitates the solution of nitrogen into the melt.



Edited by:

Katsutoshi Komeya, Yohtaro Matsuo and Takashi Goto




S. Hampshire et al., "Ca-SiAlON Glasses: Effects of Fluorine on Glass Formation and Properties", Key Engineering Materials, Vol. 352, pp. 165-172, 2007

Online since:

August 2007




[1] S. Hampshire: J. Non-Cryst. Sol., Vol. 316, (2003) p.64.

[2] R. A. L. Drew, S. Hampshire and K. H. Jack: Proc. Brit. Ceram. Soc., Vol. 31 (1981), p.119.

[3] R. E. Loehman: J. Mater. Sci. Tech., Vol. 26 (1985), p.119.

[4] S. Hampshire, R. A. L. Drew and K. H. Jack: Phys. Chem. Glass., Vol. 26, No. 5 (1985), p.182.

[5] G. Leng-Ward and M. H. Lewis: in Glasses and Glass-Ceramics, ed. M. H. Lewis, Chapman and Hall, London, (1990), p.106.

[6] R. E. Loehman: J. Non-Cryst. Sol., Vol. 56, (1983) p.123.

[7] R. Hill, D. Wood and M. Thomas, J. Mater. Sci., Vol. 34, (1999), p.1767.

[8] A. Stamboulis, R. G. Hill and R. V. Law: J. Non-Cryst. Sol., Vol. 333, (2004) p.101.

[9] T. Maeda, S. Matsuya and M. Ohta, J. Dent. Mater., Vol. 17 (2), (1998), p.104.

[10] S. Hampshire, E. Nestor, R. Flynn, J.L. Besson, T. Rouxel, H. L. Lemrcier, P. Goursat, M. Sebai, D. P. Thompson and K. Liddell: J. Euro. Ceram. Soc., 14, (1994) p.261.

[11] K. T. Stanton and R. G. Hill: J. Non-Cryst. Sol., Vol. 275, (2005) p. (2061).

[12] P. Jankowski and S. H. Risbud: J. Mater. Sci., Vol. 18 (1983), p. (2087).

[13] W. Loewenstein and M. Loewenstein: J. Amer. Mineral., Vol. 39, (1954) p.92.

[14] R. G. Hill, C. Goat and D. Wood: J. Amer. Ceram. Soc., Vol. 75.

[4] (1992) p.778.

[15] S. H. Risbud, R. J. Kirkpatrick, A. P. Taglialavore and B. Montez: J. Amer. Ceram. Soc., Vol. 70, (1987), p. C10.

[16] A. Rafferty, A. Clifford, R. Hill, D. Wood, B. Samuneva and M. Dimitrova-Lukacs: J. Amer. Ceram. Soc., Vol. 83, No 11, (2000) p.2833.

[17] E.M. Levin, C.R. Robbins, H. F. McMurdie: Phase Diagram for Ceramists, American Ceramic Society, Columbus, OH, (1964) p.220.

[18] M. J. Pomeroy, C. Mulcahy, S. Hampshire: J. Am. Ceram. Soc., Vol. 86 No 3 (2003), p.458.