Masters Theses

Abstract

"The tie line connecting the compounds 3CaO·Al2O3 and Na2O·8CaO·3Al2O3 in the ternary system CaO-Al2O3-Na2O was studied at 1250° Celsius.

It was determined that Na2O can exist in crystalline solution with 3CaO·Al2O3 in percentages of about 2.3% or less without any apparent change in the structure of 3CaO·Al2O3. X-ray diffraction peaks in the back-reflection region shifted to lower d-spacing values on increasing Na2O contents.

At a Na2O content of about 2.7%, each major x-ray diffraction peak of 3CaO·Al2O3 splits into two peaks, indicating the appearance of a new phase. This new phase occurs on the tie line investigated with Na2O contents varying from 2.7% to 7.7%. Peaks corresponding to 3CaO·Al2O3 do not appear in the x-ray patterns for samples with Na2O content greater than 2.7%. The composition containing 2.7% Na2O shows x-ray diffraction peaks corresponding to both 3CaO·Al2O3 and the new phase. The new phase has d-spacing values very similar to the ternary compound Na2O·8CaO·3Al2O3 and might consist of this compound or a crystalline solution of Na2O·8CaO·3Al2O3 deficient with respect to Na2O”--Abstract, page ii.

Advisor(s)

Day, D. E.

Committee Member(s)

Lorey, G. Edwin
Carroll, William R.
Tappmeyer, Wilbur P.

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Publisher

University of Missouri at Rolla

Publication Date

1964

Pagination

vi, 47 pages

Note about bibliography

Includes bibliographical references (pages 43-44).

Rights

© 1964 Joel A. Conwicke, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 1662

Print OCLC #

5962638

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