Ma-M2T spinel solid solution enhanced magnesium oxide-based ceramic foam filter and preparation method therefor

A method for preparing an MA-M2T spinel solid solution-reinforced magnesium oxide-based ceramic foam filter wherein the method comprises the steps of:

• 1) preparing a ceramic slurry having a solid content of 60 wt. %-70 wt. % by dosing 15%-25% by mass of a nanometer alumina sol, 0.8%-1.5% by mass of a rheological agent, and the balance magnesium oxide ceramic powder comprising a nanometer titanium oxide sintering aid, and then adding deionized water and ball milling to mix until uniform, and vacuum degassing the mixture;
• the rheological agent is a mixture of polyacrylic acid and a cellulose ether, wherein polyacrylic acid accounts for 20% of the mass of the rheological agent, the cellulose ether is one of industrial-use hydroxyethyl cellulose and hydroxy propyl methyl cellulose, or a mixture thereof;
• the magnesium oxide ceramic powder comprising a nanometer titanium oxide sintering aid is a mixture of a magnesium oxide powder and a nanometer titanium oxide powder;
• 2) soaking a polyurethane foam plastic template into the ceramic slurry, squeezing by a roller press the polyurethane foam plastic template to remove redundant slurry to make a biscuit, and drying the biscuit by heating it to 80° C.-120° C.;
• 3) putting the dried biscuit into a sintering furnace, elevating the temperature to 1400° C.-1500° C. and performing a high temperature sintering, cooling to the room temperature with the furnace to obtain the magnesium oxide-based ceramic foam filter.