| abstract |
The invention discloses a Mg(Al, Cr) 2 O 4 composite spinel reinforced magnesia-based foam ceramic filter capable of sintering at low temperature, excellent in chemical stability and thermal shock resistance, and a preparation method thereof. The method includes the following steps: (1) 15% to 25% of nano-aluminum sol, 0.8% to 1.5% of rheology agent, and the rest are magnesium oxide ceramic powder containing nano-chromium trioxide sintering aid according to the mass percentage. , adding anhydrous ethanol ball milling and mixing evenly to make a ceramic slurry with a solid content of 60% to 70%; (2) Immerse the polyurethane foam plastic template into the ceramic slurry, and remove the polyurethane foam plastic template by pressing the roller press. The excess dipping and hanging slurry is made into china, and then the ethanol solvent is removed in the ventilation room at 40℃～50℃ to dry the china; (3) the dried china is put into the sintering furnace, and the temperature is raised to 1350℃～1550℃ High temperature sintering is carried out at the same temperature, and the magnesium oxide-based foam ceramic filter is obtained by cooling to room temperature with the furnace. |