Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to porous calcium zirconium aluminate and a preparation method thereof. According to the technical scheme, the method includes the steps that limestone, aluminium hydroxide and zirconium hydroxide are blended according to the molar ratio of CaO to Al2O3 to ZrO2 being 7 to 3 to 1 first, the materials are placed in a ball grinder to be subjected to wet grinding for 1-10 hours by using water as a medium, slurry is filtered and dried, and accordingly a mixed material block is obtained; then the mixed material block is ball-milled into powder with the granularity being 1-100 microns; afterwards, water accounting for 1-10 wt% of the powder is added into the powder to be evenly mixed and pressed into a blank, and standing is carried out for 24 hours; then drying is conducted for 24 hours at the temperature of 110 DEG C, the blank is placed in a high-temperature furnace to conduct heat preservation for 2-8 hours under the temperature condition of 1000-1800 DEG C, cooling is conducted, crushing or fine grinding is performed till the needed granularity is reached, and accordingly the porous calcium zirconium aluminate is obtained. According to the porous calcium zirconium aluminate and the preparation method thereof, the process is simple, the prepared porous calcium zirconium aluminate has a gelatinization property, energy consumption in the product drying or heat treatment process can be lowered obviously when the porous calcium zirconium aluminate is used as a binding agent and a raw material for preparing high-temperature ceramics and refractory matter, and the thermal shock stability performance and high-temperature strength of the refractory matter can further be improved.
The invention relates to porous calcium zirconium aluminate and a preparation method thereof. According to the technical scheme, the method includes the steps that limestone, aluminium hydroxide and zirconium hydroxide are blended according to the molar ratio of CaO to Al2O3 to ZrO2 being 7 to 3 to 1 first, the materials are placed in a ball grinder to be subjected to wet grinding for 1-10 hours by using water as a medium, slurry is filtered and dried, and accordingly a mixed material block is obtained; then the mixed material block is ball-milled into powder with the granularity being 1-100 microns; afterwards, water accounting for 1-10 wt% of the powder is added into the powder to be evenly mixed and pressed into a blank, and standing is carried out for 24 hours; then drying is conducted for 24 hours at the temperature of 110 DEG C, the blank is placed in a high-temperature furnace to conduct heat preservation for 2-8 hours under the temperature condition of 1000-1800 DEG C, cooling is conducted, crushing or fine grinding is performed till the needed granularity is reached, and accordingly the porous calcium zirconium aluminate is obtained. According to the porous calcium zirconium aluminate and the preparation method thereof, the process is simple, the prepared porous calcium zirconium aluminate has a gelatinization property, energy consumption in the product drying or heat treatment process can be lowered obviously when the porous calcium zirconium aluminate is used as a binding agent and a raw material for preparing high-temperature ceramics and refractory matter, and the thermal shock stability performance and high-temperature strength of the refractory matter can further be improved.
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