"Subsolidus equilibria in the low silica portion of the system ZrO₂-Al₂O₃-SiO₂ were studied by X-ray diffraction of quenched samples fired at 1300°, 1400°, and 1480°C. Samples prepared as powders from combinations of a-Al₂O₃, Al(OH)₃, silicic acid, ZrO₂, and kaolinite reacted very slowly at 1300° and 1400°C and the trends toward equilibria are not apparent. A mixture of zircon and Al(OH)₃ reacted slowly at 1480°C to form mullite and ZrO₂, indicating that the latter phases are the stable assemblage rather than zircon and alumina. A gel prepared from aluminum nitrate, zirconyl nitrate, and colloidal silica reacted at 1480°C to form alumina, zirconia, zircon, and mullite; with continued firing, however, the zirconia and mullite developed further at the expense of aluminia and zircon. A tetragonal, pseudocubic, metastable phase developed in the calcined gel and was quite persistent, even at 1480°C. Hypothetical ternary liquidus surfaces have been proposed on the basis of available binary data from the literature"--Abstract, page ii.
Sorrell, Charles A.
Materials Science and Engineering
B.S. in Ceramic Engineering
Missouri University of Science and Technology
vi, 49 pages
© 1975 Charles Christopher Sorrell, All rights reserved.
Thesis - Open Access
Sorrell, Charles Christopher, "Subsolidus equilibria and metastable phase development in the system ZrO₂-Al₂O₃-SiO₂" (1975). Bachelors Theses. 403.