| 摘要 |
The sintered corundum body has a closed cell structure, specified macroporosity, cell size, structural porosity and sintered crystallite size values and low glass-forming impurity and dopant contents. A sintered corundum body has a closed cell structure, a macroporosity of 5-50 vol.%, a cell size of less than 250 mu m, a structural porosity of less than 2.5%, a sintered structure mean crystallite size of less than 5 mu m and a glass-forming impurity and dopant content of less than 3 wt.%. An Independent claim is also included for the production of the above sintered body by: (a) preparing a ceramic slip of 35-50 vol.% solids content and 0.1-0.5 Pas viscosity (measured by a rotary viscometer with a shear rate of 100 second<-1>); (b) impregnating the slip into an open porous pyrolyzable organic body of 30-300 pores/cm pore frequency to fill all the macropores; (c) removing 0-50 vol.% of the impregnated slip for achieving the desired macroporosity in the sintered body; (d) drying at 60-80 deg C; and (e) firing in flowing air at 1000-1200 deg C; and sintering the resulting ceramic skeleton.
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