POROUS CERAMICS

摘要

The present invention relates to the high-temperature ceramic materials having elevated porosity that could be used as filtration (purification) materials of technological processes in the wide temperature range (at normal temperature 20 oC as well as at increased temperature not over 700 oC, in order to prevent getting in environment harmful to nature (human) technological fallout (dust, gases), for catching undesirable impurities from alloys for improve quality thereof, as well as for purification exhaust fumes of care engines. Porous ceramics could be used also as 'light-weight' construction material in technological equipment.The described porous ceramics are obtained from raw material mixture containing mineral raw materials (in weight %) respectively - clay and dolomite 9 - 10 %, quartz sand 37.5 - 39.5 %, aluminium oxide (gamma Al2O3) 26 - 28.8 %, magnesium oxide (MgO) 9 - 11.5 % and K2CO3 5 - 6.25%. The offered raw material mixture ensures at the temperature range of 1250 to 1320 oC development of ceramics containing pores with common pore volume up to 30 - 40 %. Ceramics possess sufficient compression strength 4.3 - 4.7 MPa and elevated chemical durability.