Method of preparing aluminum oxide-silicon carbide compound porous ceramic by aluminum-silicon industrial waste residues

[0024] (1) Weigh 10g of fly ash and activated carbon mixed raw material, wherein the ratio of fly ash to activated carbon is 10:3; add 5% SiC and 3% phenolic resin by mass fraction; -1 Ball milling in a ball mill for 10 hours;

[0025] (2) Dry the raw material mixed by ball mill at 70° C. for 24 hours;

[0026] (3) After the drying is completed, pour the powder into the mold, and hold the pressure at 150MPa for 5 minutes to form;

[0027] (4) Then put the pressed ceramic body into a tubular resistance furnace, and introduce Ar gas; keep it at a preset temperature of 1500°C for 6h, control the temperature to 1000°C, and cool it with the furnace to obtain alumina-silicon carbide composite porous ceramics.

[0028] After testing, the porosity of the obtained porous ceramics is 64%, the compressive strength at room temperature is 12.7MPa, and the thermal diffusivity is 0.017cm 2 ·s -1 .

[0030] (1) Weigh 10g of fly ash and activated carbon mixed raw material, wherein the ratio of fly ash to activated carbon is 10:4; add 20% SiC and 3% phenolic resin; -1 Ball milling in a ball mill for 10 hours;

[0031] (2) Dry the raw material mixed by ball mill at 70° C. for 24 hours;

[0032] (3) After the drying is completed, pour the powder into the mold, and hold the pressure at 200MPa for 5 minutes to form;

[0033] (4) Then put the pressed ceramic body into a tubular resistance furnace, and introduce Ar gas; keep it at a preset temperature of 1600 °C for 4 hours, control the temperature to 1000 °C and cool it with the furnace to obtain alumina-silicon carbide composite porous ceramics.

[0034] After testing, the porosity of the obtained porous ceramics is 52%, the compressive strength at room temperature is 18.3MPa, and the thermal diffusivity is 0.021cm 2 ·s -1 .

[0036] (1) Weigh 10g of fly ash and activated carbon mixed raw material, wherein the ratio of fly ash to activated carbon is 10:5; add 10% SiC and 3% phenolic resin in mass fraction; -1 Ball milling in a ball mill for 10 hours;

[0037] (2) Dry the raw material mixed by ball mill at 70° C. for 24 hours;

[0038] (3) After the drying is completed, pour the powder into the mold, and hold the pressure at 100MPa for 5 minutes to form;

[0039] (4) Then put the pressed ceramic body into a beam-type resistance furnace and pass it with Ar gas, and keep it at a preset temperature of 1600°C for 6h, control the temperature to 1000°C and cool it with the furnace to obtain alumina-silicon carbide composite porous ceramics.

[0040] After testing, the porosity of the obtained porous ceramics is 60%, the compressive strength at room temperature is 13.4MPa, and the thermal diffusivity is 0.019cm 2 ·s -1 .