Abstract
Vitrification, thermal expansion and electrical resistivity of some mixtures within the system: MgO-Al2O3-SiO2-ZrO2 were studied in the light of their phase composition. The effect of adding 1 to 2% Li2O on the phase composition and properties of these mixtures was also investigated. All of the investigated mixtures vitrify between 1200 and 1400‡C. The vitrified bodies show low thermal expansion and reasonable electrical resistivity. The increase of cordierite, at the expense of cristobalite and mullite phases, decreases the thermal expansion and increases the electrical resistivity. In mixtures containing Li2O, an LiMg-aluminosilicate phase crystallizes leading to a further decrease in thermal expansion and to a slight deterioration of electrical resistivity.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
W. M. Cohn,Ann. Phys. 5 (1930) 493.
R. F. Geller andH. Insley,Nat. Bur. Stand. (US) J. Res. 9 (1932) 17.
R. S. Lamar,J. Amer. Ceram. Soc. 32 (1949) 65.
E. Z. Basta andM. K. A. Saed,Trans. J. Brit. Ceram. Soc. 72 (1973) 69.
P. G. Herold andW. J. Smothers,J. Amer. Ceram. Soc. 73 (1954) 351.
R. A. Kordyok andW. J. N. V. Gul'ko,Dokl. Akad. Nauk. SSSR. 154 (1964).
Idem, ibid. Dolk. Chem. Technol. 154 (1964) 28.
C. Leopoldo,Vetro e Silicati 3 (1959) 39.
N. F. Osborn andA. Muan, revised and redrawn “Phase Equilibrium Diagrams of Oxide Systems”, Amer. Ceram. Soc. and Edward Orton, Jr, Ceramic Foundation Fig. 712 (1975) 246.
H. R. Wiseley,Amer. Ceram. Soc. Bull. 36 (1957) 133.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sallam, E.H., Serry, M.A. & Naga, S.M. Low thermal expansion electrical insulators. J Mater Sci 21, 3269–3273 (1986). https://doi.org/10.1007/BF00553368
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00553368