Author:
Trubitsyn M. A.,Furda L. V.,Yapryntsev M. N.,Volovicheva N. A.
Abstract
Abstract
Phase formation of calcium monoaluminate and calcium dialuminate in the СаО–Al2О3 system in the range 230–1450°C was studied using a model powder mixture comprising aluminum and calcium hydroxides. The onset of formation of an intermediate phase Ca12Al14O33 (С12А7) was observed at 430°С. At 1100°С, the appearance of CaAl4O7 (CA2) and the presence of κ-Al2O3 were observed. The onset of intense formation of the CaAl2O4 (СА) phase is at 1170°С. In the range 1250–1400°С, the CA amount increases notably, while the СА2 proportion remains almost unchanged. The final formation of the CA and CA2 target phases occurs in 2 h at 1450°С. The syntheses of CA and CA2 is controlled by Ca2+ diffusion inward the aluminum-enriched cores of spherulites. Energy dispersive X-ray spectroscopy elucidated the CA and CA2 distribution in the form of concentric layers.
Subject
Inorganic Chemistry,Physical and Theoretical Chemistry,Materials Science (miscellaneous)
Reference31 articles.
1. G. A. Rankin and E. F. Wright, Am. J. Sci. Ser. 39, 1 (1915).
2. R. W. Nurse, J. H. Welch, and A. J. Majumdar, Trans. Brit. Ceram. Soc. 64, 409 (1965).
3. N. A. Toropov, V. P. Barzakovskii, V. V. Lapin, et al., State Diagrams of Silicate Systems. Handbook. Issue 1. Double Systems (Nauka, Leningrad, 1969) [in Russian].
4. D. A. Jerebtsov and G. G. Mikhailov, Ceram. Int. 27, 25 (2001). https://doi.org/10.1016/S0272-8842(00)00037-7
5. R. E. Rojas-Hernandez, F. Fernando Rubio-Marcos, J. F. José Francisco Fernandez, et al., Materials 14, 4591 (2021). https://doi.org/10.3390/ma14164591
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