Bachelors Theses

Abstract

"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.

Advisor(s)

Sorrell, Charles A.

Department(s)

Materials Science and Engineering

Degree Name

B.S. in Ceramic Engineering

Publisher

Missouri University of Science and Technology

Publication Date

1975

Pagination

vi, 49 pages

Note about bibliography

Includes bibliographical references (pages 47-49).

Rights

© 1975 Charles Christopher Sorrell, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

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