Skip to main content Accessibility help
×
×
Home

A study of calcium hexaluminate

  • D. S. Buist (a1)

Summary

Calcium hexaluminate has recently been confirmed as a stable phase occurring within the system CaO-Al2O3. In the present investigation, this aluminate has been synthesized from the constituent oxides and its X-ray, optical, and physical (microhardness and reflectivity) properties determined. Similar data have also been obtained on the ferrian phase from the immediate hot-face zone of high-alumina bricks that had been in service in electric arc furnace roofs. An electron-probe microanalysis study revealed that between 12 and 13 % atomic replacement of Al by Fe had occurred in this ferrian calcium hexaluminate. The melting behaviour of the pure compound has been studied by firing pellets in a specially-constructed vacuum furnace. Results show the incongruent melting point to be 1870°C (±10° C), while the liquidus temperature is 1970° C (±10° C). These points were determined by examining polished sections of compacts heated within the range 1820 to 2000° C. A revised phase diagram of the high-alumina portion of the system CaO-Al2O2 is presented.

Copyright

References

Hide All
Auriol, (A.), Hauser, (G.), and Wurm, (J. G.), 1964. Phase Diagrams for Ceramists (American Ceramic Society), fig. 232, p. 102.
Buist, (D. S.), Jackson, (B.), Stephenson, (I. M.), Ford, (W. F.), and White, (J.), 1965. Trans. Brit. Ceram. Soc., vol. 64, p. 173.
Buist, (D. S.) and Gelsthorpe, (J. R.). Science of Ceramics, vol. 4 (to be published).
Burdese, (A.) and Brisi, (C.), 1961. Annali Chim., vol. 41, p. 564.
Dayal, (R. R.) and Glasser, (F. P.). Science of Ceramics, vol. 3 (to be published).
[Filonenko, (N. E.)], 1949. (Compt. Rend. Acad. Sci. URSS), vol. 64]; cited by Filonenko and Lavrov (1949).
[Filonenko, (N. E.)] and Lavkov, (I. V.)], 1949. Ibid., vol. 66, p. 673.
Gentile, (A. L.) and Foster, (W. R.), 1963. Journ. Amer. Ceram. Soc, vol. 46, p. 74.
Hayhukst, (A.) and Webster, (R.), 1964. I.S.I. Spec. Rep. 87, p. 171.
Hughes, (H.), 1967. Internal report, The United Steel Companies, Limited, Research & Development Department, Swinden Laboratories, Rotherham.
Langenberg, (F. C.) and Chipman, (J.), 1956. Journ. Amer. Ceram. Soc., vol. 39, p. 432.
Nichol, (I.) and Phillips, (R.), 1965. Min. Mag., vol. 35, p. 200.
Osborn, (E. F.) and Muan, (A.), 1964. Phase Diagrams for Ceramists (American Ceramic Society), Fig. 630, p. 219.
Perry, (G. S.), 1966. Paper presented at the Eighth Electromagnetic Window Symposium, Georgia Institute of Technology, Atlanta, Georgia, 1-3 June 1966.
Rankin, (G. A.) and Weight, (F. E.)., 1915. Amer. Journ. Sci., ser. 4, vol. 39, p. 1.
Shepherd, (E. S.), Rankin, (G. A.), and Weight, (F. E.), 1909. Ibid., vol. 28, p. 293.
Wisnyi, (L. G.), 1955. High Alumina Phases in the System Lime-Alumina. Doctoral dissertation, School of Ceramics, Rutgers, the State University.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Mineralogical Magazine
  • ISSN: 1876-1968
  • EISSN: 2515-821X
  • URL: /core/journals/mineralogical-magazine
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed