Stability of the Refractory-Bond Phases in High Alumina Refractories in Steam-CO Atmospheres
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. = 260OC 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.
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.
Fall meeting of the Refractories Div. of the American Ceramic Society (1975: Oct. 4, Bedford, PA)
Materials Science and Engineering
Keywords and Phrases
Refractory Materials - Alumina; Alumina
International Standard Serial Number (ISSN)
Article - Conference proceedings
© 1978 American Ceramic Society, All rights reserved.
01 Jul 1978