Refractory material

Details Refractory material Refractory material

1992-05-29

1994-06-21

Valentine, Donald R.

Compositions: ceramic

Ceramic compositions

Refractory

501134, 501153, C04B 3510, C04B 3546

Patent

active

053228260

ABSTRACT:
The invention relates to a material which is refractory, porous, resistant to fluorine-containing gases, stable in its volume and heat-insulation, particularly in the form of formed bricks, for a refractory, heat-insulating lining in electrolytic cells, in which metal aluminum is extracted by electrolysis from aluminum oxide dissolved in a fluoride melt; the material has an Al.sub.2 O.sub.3 content of over 50 wt % and a TiO.sub.2 content of 2.5-10 wt % and during the action of fluorine-containing gases at temperatures between 700.degree. and 1000.degree. C. in the area of the material exposed to the fluorine gas, on free surfaces, particularly at the boundary surfaces of intergranular hollow spaces, needle-shaped TiO.sub.2 crystals and/or TiO.sub.2 -containing crystals are formed, growing without regularity into the porous space. The invention furthermore relates to a method for the manufacture as well as the use of the refractory material.

REFERENCES:
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patent: 5076815 (1991-12-01), Kunz et al.
Eric Bright and Dennis W. Readey, "Dissolution Kinetics of TiO.sub.2 in HF-HCI Solutions", Dec. 1987, Journal of the American Ceramic Society, vol. 70, No. 12, pp. 900-906.
Lawrence H. Edelsonand Andreas M. Glaeser, "Role of Particle Substructure in the Sintering of Monosized Titania", Apr. 1988, Journal of the American Ceramic Society, vol. 71, pp. 225-235.
G. Desgardin, I. Mey, B. Raveau, and Jean-Marie Haussonne, "BaLiF.sub.3 -A New Sintering Agent for BaTiO.sub.3 -Based Capacitors", Ceramic Bulletin, vol. 64, No. 4, 1985, pp. 564-570.
Von G. Routschka, "Feuerfeste Baustoffe fur Roheisentransportgefasse und Roheisenmischer im Spiegal der Literatur", Keramische Zeitschrift, 27, Jahrgange, Nr. 10, 1975, pp. 521-528.

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