MASS FOR PREPARING OF POROUS CERAMIC MATERIAL Russian patent published in 1994 - IPC

FIELD: ceramics. SUBSTANCE: mass has, wt.-%: synthetic corundum (size particle is 20 microns) 82-86; glass-enamel (size particle is 1 micron) 4-8; water-soluble polymer 0.5-0.9, and water - the rest. Glass-enamel has the following composition, wt. -%: silicon oxide (SiO₂) 66.5; aluminium oxide (Al₂O₃) 1.9; boron oxide (B₂O₃) 13.9; calcium oxide (CaO) 2.5; sodium oxide (Na₂O) 2.4; potassium oxide (K₂O) 2.1; lithium oxide (Li₂O) 5.1; titanium oxide (TiO₂) 1.1; zinc oxide (ZnO) 1.9, and cobalt oxide (Co₂O₃) 2.6. Properties of material: porosity is 41-44%, mean pore diameter is 7 microns, limit compression strength is 12-24 MPa, stability in 12% solutions of HNO₃ is 66.5-99% (strength retention of initial value), and in NaOH is 71.1-99.6%. Mass is used for porous filtering ceramic making. EFFECT: enhanced quality of mass. 2 tbl