Ceramic spheroids having low density and high crush resistance

Details Ceramic spheroids having low density and high crush resistance Ceramic spheroids having low density and high crush resistance

C - Chemistry, Metallurgy

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B

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C04B 38/06 (2006.01) B01D 39/06 (2006.01) B01J 19/30 (2006.01) C04B 20/06 (2006.01) C09K 8/80 (2006.01) E21B 43/267 (2006.01)

Patent

CA 1251223

40723 CAN 5A Abstract of the Disclosure CERAMIC SPHEROIDS HAVING LOW DENSITY AND HIGH CRUSE1 RESISTANCE Ceramic spheroids having: A. a core made by firing raw materials comprising about: 50-99.8 parts by weight mineral particulates; 0.l to 50 parts by weight silicon carbide; and 0.l to 15 parts by weight binder (e.g. bentonite); and B. an outer shell comprising Al2O3 or MgO. More alumina or magnesium oxide is contained in the outer shell than in the core. The core of the ceramic spheroid has closed cell microporosity. The inventive spheroids are characterized by a density less than 2.2 g/cc and can be readily made to have a density less than 1 g/cc. These ceramic spheroids combine high strength (due to the tough outer shell) with low density (due to the closed cell microporosity) and have applications (among others) as buoyant water filtration media and low density fillers.

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