Cordierite, alumina, silica porous ceramic bodies coated with an activated alumina layer
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United States of America Patent
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Mar 24, 1981
Grant Date -
N/A
app pub date -
Oct 22, 1979
filing date -
Oct 21, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ceramic porous body useful as a filtering material for molten metal is disclosed. The ceramic porous body, consisting essentially of cordierite, alumina and silica, is formed by covering surfaces of cell strands of a ceramic porous body skeleton having a bulk specific gravity of 0.25-0.55 with 3-40% by weight per the weight of the skeleton of an activated alumina layer and has an average diameter of interconnected voids of 0.3-5.0 mm, a pressure loss of 0.3-30.0 mm as a water-gauge pressure when passing air through the body of 1 cm thick at a rate of 1 m/sec., a microsurface area of not less than 10 m.sup.2 /g and a porosity of 75-95%.
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