Masters Theses

Abstract

"The deformation of refractory materials consisting of 90% sintered or fused alumina plus 10% silica was measured at temperatures from 1450 to 1515⁰C and a compressive stress of 100 psi. Creep rates and activation energies were determined from the steady state portion of deformation vs. time data and correlated with the mineralogical composition. Supplemental measurements included x-ray diffraction, electron probe microanalysis, apparent porosity and tensile strength. conditions having an important effect upon the mineralolgical composition were: (1) duration of heat treatment, (2) amount of sodium oxide impurity, and (3) reactivity of the alumina grain. Prolonged heat treatment and sodium oxide impurity enhanced mullite formation, thus lowering creep rates. The activation energies ranged from 75 kcal/mole for samples containing sintered alumina doped with 0.5% sodium oxide, to 140-150 kcal/mole for regular sintered or fused alumina. The magnitude of the activation energy was approximately proportional to the mullite content"--Abstract, page [i].

Advisor(s)

Day, D. E.

Committee Member(s)

Branson, Donald Lee
Moore, Robert E., 1930-2003

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Sponsor(s)

Aluminum Company of America

Publisher

University of Missouri at Rolla

Publication Date

1967

Pagination

x, 80 pages

Note about bibliography

Includes bibliographical references (pages 44-51).

Rights

© 1967 Vernon L. Burdick, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Aluminum oxideMetals -- CreepRefractory materials

Thesis Number

T 2019

Print OCLC #

9525195

Electronic OCLC #

793383540

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