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Effect of LiF addition on the phase transition of sinterable β-spodumene precursor powders prepared by a sol-gel process

Published online by Cambridge University Press:  31 January 2011

Moo-Chin Wang ,
Nan-Chung Wu ,
Sheng Yang  and
Shaw-Bing Wen
Moo-Chin Wang
Affiliation:
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, 415 Chien-Kung Road, Kaohsiung, 80782, Taiwan
Nan-Chung Wu
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan
Sheng Yang
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan
Shaw-Bing Wen
Affiliation:
Department of Resources Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan
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Abstract

β-Spodumene (Li2O · Al2O · 4SiO2, LAS4) precursor powders were obtained through a sol-gel process using Si(OC2H5)4, Al(OC4H9)3, and LiNO3 as starting materials and LiF as a sintering aid. X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy with a wavelength dispersive spectrometer, and electron diffraction analysis were utilized to study the phase transition of the β-spodumene glass–ceramics prepared from the gel-derived precursor powders with LiF additive. For the LAS4 precursor powders containing no LiF, the only crystalline phase obtained was β-spodumene. For the pellets containing less than 4.0 wt% LiF and sintered at 1050 °C for 5 h, the crystalline phases were β-spodumene solid solution and β-eucryptite (Li2O · Al2O3 · 2SiO2, LAS2) solid solution. When the LiF content was 5.0 wt% and the sintering process was carried out at 1050 °C for 5 h, the crystalline phases were β-spodumene solid solution, β-eucryptite solid solution (triclinic), and eucryptite [rhombohedral (hex.)]. When the LiF addition attains 3.0 wt%, the fully densified grains are formed, accompanied with an increase in grain size for LiF addition. At the triple junction of grain boundaries a second phase segregates which is identified to be β-spodumene solid solution. In the sintering period of LAS4 precursor powders with LiF additive, the grains converted to β-eucryptite solid solution and β-spodumene solid solution remains at the grain boundaries.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 1960 - 1968
Copyright
Copyright © Materials Research Society 2002

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References

1.Strnad, Z.,Glass Science and Technology, Vol. 8, Glass-Ceramic Materials (Elsevier, Amsterdam, The Netherlands, 1986),pp. 85–96.Google Scholar
2.Scheilder, H. and Rodek, E., Am. Ceram. Soc. Bull. 68, 1926 (1989).Google Scholar
3.Kenickerbocker, S., Tuzzolo, M.R., and Lawhorne, S., J. Am. Ceram. Soc. 72, 1873 (1989).CrossRefGoogle Scholar
4.Kobayashi, H., Ishibashi, N., Akiba, T., and Mitamura, T., Nippon Seramihkkusu Kyokai Gakujutsu Ronbumshi, J. Ceram. Soc. Jpn. 98, 703 (1990).CrossRefGoogle Scholar
5.Suzuki, H., Takahashi, J.I., and Saito, H., Chem. Soc. Jpn. 10, 1312 (1991).Google Scholar
6.Yang, J.S., Sakka, S., Yoko, T., and Kozuka, H., J. Mater. Sci. 26, 1827 (1991).CrossRefGoogle Scholar
7.Dislich, H., J. Non-Cryst. Solids. 73, 599 (1985).Google Scholar
8.Schmidt, H., J. Non-Cryst. Solids. 73, 681 (1985).Google Scholar
9.Johson, D.W. Jr., Am. Ceram. Soc. Bull. 64, 1597 (1985).Google Scholar
10.Samuneva, B., Jambazov, S., Lepkova, D., and Dimitriev, Y., Ceram. Int. 16, 355 (1990).Google Scholar
11.Selmi, F.A. and Amarakoon, V.R.W., J. Am. Ceram. Soc. 71, 934 (1988).CrossRefGoogle Scholar
12.Hamasaki, T., Eguchi, K., Koyanagi, Y., Matsumoto, A., Ursunomiya, T., and Koba, K., J. Am. Ceram. Soc. 71, 1120 (1988).Google Scholar
13.Colomban, P., Ceram. Int. 15, 23 (1989).CrossRefGoogle Scholar
14.Murakami, H., Yaegashi, S., Nishimo, J., Shiohara, Y., and Tanaka, T., Jpn. J. Appl. Phys. 29, 2715 (1990).Google Scholar
15.Yang, J.S., Sakka, S., Yoko, T., and Kozuka, H., J. Mater. Sci. 25, 1773 (1990).CrossRefGoogle Scholar
16.Phalippou, J., Prassas, M., and Zarzychi, J., J. Non-Cryst. Solids 48, 17 (1982).CrossRefGoogle Scholar
17.Veltri, R. and Scola, D., Powder Metall. Int. 21, 18 (1989).Google Scholar
18.Wang, M.C., J. Ceram. Soc. Jpn. 102, 109 (1994).CrossRefGoogle Scholar
19.Huppmann, W.J., Sintering in the Presence of a Liquid Phase, in Sintering and Catalysis, edited by Kuczynski, G.C. (Plenum Press, New York, 1975), pp. 359–378.CrossRefGoogle Scholar
20.German, R.M., Liquid Phase Sintering (Plenum Press, New York, 1985), pp. 49–52.CrossRefGoogle Scholar
21.Kim, D.Y. and Accary, A., Mechanisms of Grain Growth Inhibitim During Sintering of WC-Co Based Hard Metals, in Sintering Process, edited by Kuczynski, G.C. (Plenum Press, New York, 1980), pp. 235–244.CrossRefGoogle Scholar
22.Stookey, S.D., U.S. Patent 2 92097 (12 January 1960).Google Scholar
23.Doherty, P.E., Lee, D.W., and Davis, R.S., J. Am. Ceram. Soc. 50 77 (1967).Google Scholar
24.Ray, S. and Muchou, G.M., J. Am. Ceram. Soc. 67, 851 (1968).Google Scholar
25.Barry, T.I., Clinton, D., Lay, L.L., Mercer, R.A., and Miller, R.P., J. Mater. Sci. 5, 117 (1970).CrossRefGoogle Scholar
26.Sack, V.W. and Scheidler, H., Glasstech. Ber. 39, 126 (1966).Google Scholar
27.Hsu, J.Y. and Speyer, R.F., J. Am. Ceram. Soc. 67, 620 (1990).Google Scholar
28.Stewart, D.R., Advances in Nucleation and Crystallization in Glass, edited by Hench, L.L. and Freeman, S.W. (American Ceramic Society, Columbus, OH, 1971), pp. 83–90.Google Scholar
29.Maier, V. and Miller, G., J. Am. Ceram. Soc. 70, c176 (1987).CrossRefGoogle Scholar
30.Wang, M.C., Wu, N.C., Yang, S., and Wen, S.B., Metall. Mater. Trans. A 33, 171 (2002).CrossRefGoogle Scholar
31.Chyung, C.K., J. Am. Ceram. Soc. 52, 242 (1969).Google Scholar