Abstract
Ultra low and negative expansion glass-ceramic materials have been obtained from pyrophyllite and blast furnace slag. The batch composition was modified with the addition of lithium carbonate, hydrated alumina, boric acid and nucleating agent (titania). The batch was melted at 1400°C followed by casting in the form of bars and annealed at 510°C for 4 h. The annealed specimens were subjected to heat treatment at predetermined temperatures selected from DTA study of the parent glass. Thermal expansion measurement and X-ray diffraction analysis revealed that the specimen nucleated at 545°C for 4 h and crystallized at 720°C for 2 h which resulted in negative coefficient of thermal expansion [(-) 9 to (-) 2 x 10-7/°C] over the temperature range (30-600°C) due to the formation ofβ bd-eucryptite while other heating schedule showed the formation of spodumene and lithium aluminium silicates. The samples showed excellent flexural strength value and varied in the range 120–200 MPa depending upon the phases present.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Boccacini A R and Rawlings R D 2002Science 23 18
Chang S H and Jung H J 1980Yo op Hoe Chi 17 20
Eppler R A 1963J. Am. Ceram. Soc. 45 100
Freimann S W and Hench L L 1971Advances in nucleation and crystallization;Proc. of annual session of Am. Ceram. Soc. (NY: Am. Ceram. Soc.)
Hillebrand W F and Lundell G E F 1953Applied inorganic analysis (NY: John Wiley & Sons) 2nd ed
Hlavac J 1983The technology of glass ceramics (NY: Elsevier)
Khater G A 2002Ceram. Int. 28 59
Kneiss C T, Borba De C D G, Neves E, Kuhnen N C and Riella H G 2002Interceram 51 140
Locsei B 1962Proc. of symposium on nucleation and crystallization in glasses and melts (Ohio: Am. Ceram. Soc.)
Macmillan P W 1980Glass-ceramics (London, NY: Academic Press) 2nd ed.
Mandal S, Ghatak S and Chakrabarti S 2000Development of a low expansion material and evaluation of its properties with respect to glass-ceramic behaviour, Proc. of 63rd Annual Session of Ind. Ceram. Soc. New Delhi (Kolkata: Ind. Ceram. Soc.) pp 77–80
Park J Y, Moon S O and Heo J 2003Ceram. Int. 29 223
Romero-Perz Met al 2001Mater Res. Bull. 36 1513
Rozenstrauha I, Cimdins, R, Berzina L and Bajare D 2002Glass Sci. Technol. 75 132
Shennawi A W A 1983Ain Shams Sci. Bull. 24 225
Suzuki S and Taraka M 1997J. Mater. Sci. 32 1775
Strand Z 1986Glass ceramic materials (NY: Elsevier)
Wang M C and Hon M H 1990Nippon Seramikkasu Kyokai Gakujutsu Ronbushi 98 625
Yoshimi T, Takao S, Hidermaro F and Yoshihazu Y 1977Aichiken Kogyo Shidosho Hokoku 15 67
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mandal, S., Chakrabarti, S., Ghatak, S. et al. Ultra low and negative expansion glass-ceramic materials produced from pyrophyllite and blast furnace slag. Bull Mater Sci 28, 437–443 (2005). https://doi.org/10.1007/BF02711233
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02711233