Masters Theses

Abstract

"The crystallization process in a zirconia-alumina- silica melt of high viscosity was studied, A system was used of the same composition found in commercial electrocast glass tank refractories. Artificial nucleation was tried in an attempt to control the process of crystallization; the method involved the addition of suitable "seeding" material.

It was found that introduction of nucleation agents consisting of the major component oxides of the system had noted effect upon the course of crystallization. Preferred orientation normally found in unseeded electrocast refractories was diminished with the addition of zirconia grains and amplified with particles of tabular alumina.

Results obtained point to two different courses to be followed in further investigations depending upon the users of electrocast refractories. Melts seeded with zirconia produced blocks in which partial or complete elimination of an undesirable shrinkage cavity was attained. The term block is used for fusion cast test blocks having dimensions of 12" x 12" x 6" These blocks had an increased porosity, but maintained their structural soundness. Tabular alumina was used as a nucleating agent resulting in a block of very dense structure with a large central shrinkage cavity"--Abstract, page vi.

Advisor(s)

Lorey, G. Edwin

Committee Member(s)

Larson, Andrew H.
Moore, Robert E., 1930-2003
Planje, Theodore J., 1919-1980

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Sponsor(s)

Walsh Refractories Corporation

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1962

Pagination

vi, 67 pages

Note about bibliography

Includes bibliographical references (pages 60-64).

Rights

© 1962 Thomas S. Montgomery, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 1405

Print OCLC #

5938321

Electronic OCLC #

1018305912

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