Stability of the Refractory-Bond Phases in High Alumina Refractories in Steam-CO Atmospheres

Author

William V. Ballard
D. E. Day, Missouri University of Science and TechnologyFollow

Abstract

The chemical resistance of the bond phases in a dense fired alumina, phosphate-bonded ramming mix and calcium aluminate cement-bonded castable to five steam--CO atmospheres at 385, 750, and 1015 psia and approx. = 260 and approx. = 950/sup 0/C was evaluated from physical property changes, x-ray diffraction, DTA/TGA and Auger electron spectroscopy. A decrease in the modulus of rupture for the dense fired alumina exposed to steam-containing atmospheres at approx. = 260^OC corresponded to an increase in Ca segregation at the external surfaces. The AIPO₄-bond phase was sensitive to saturated steam only. The calcium aluminate cement-bond phases reacted to form CaCO₃, Ca(HCO₂)₂, AIO(OH) (boehmite) and hydrated calcium aluminate phases.

Recommended Citation

W. V. Ballard and D. E. Day, "Stability of the Refractory-Bond Phases in High Alumina Refractories in Steam-CO Atmospheres," American Ceramic Society Bulletin, vol. 57, no. 7, pp. 660 - 666, American Ceramic Society, Jul 1978.

Meeting Name

Fall meeting of the Refractories Div. of the American Ceramic Society (1975: Oct. 4, Bedford, PA)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Refractory Materials - Alumina; Alumina

International Standard Serial Number (ISSN)

0002-7812

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1978 American Ceramic Society, All rights reserved.

Publication Date

01 Jul 1978