Inventors:
Paul A. Bosomworth - Hendersonville NC
Cinta M. Kelzenberg - Hendersonville NC
Kenneth R. Butcher - Hendersonville NC
Assignee:
Alusuisse-Lonza Services, Ltd. - Zurich
International Classification:
C04B 3800
C04B 3548
C04B 3580
Abstract:
Ceramic bodies suitable for use in the filtration of molten metal are formed by immersing a porous organic substrate material in an aqueous thixotropic slurry containing yttria, zirconia and alumina; expelling excess slurry; drying the impregnated material; and heating to an elevated temperature to burn off the organic material and sinter the ceramic materials. The resulting zirconia-alumina ceramic bodies have from about 5-80% of the zirconia in a monoclinic phase and the remainder of the zirconia essentially in a stabilized cubic phase due to the yttria. The ceramic bodies thus produced have excellent strength, density, and thermal shock resistance properties.