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

A technology of industrial waste residue and porous ceramics, which is applied in the production and application of ceramic products and ceramic materials, can solve the problems of environmental pollution, inconvenience in daily life, and secondary pollution of the environment, and achieve low equipment requirements, significant economic benefits and environmental protection Benefit, the effect of appropriate porosity

CN107399988AActive Publication Date: 2017-11-28NORTHEASTERN UNIV CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-11-28
Patent Text Reader

Abstract

The invention discloses a method of preparing aluminum oxide-silicon carbide compound porous ceramic by aluminum-silicon industrial waste residues. The primary raw materials comprise industrial waste residues, carbon powder, a pore forming substance and an adhesive. The aluminum oxide-silicon carbide compound porous ceramic is prepared by the following steps of mixing, drying, forming and sintering to obtain a final product. Treatment and high additional value utilization of the industrial waste residues are achieved. The prepared porous ceramic is remarkable in performance, and can be applied to the fields of filtration, sound isolation, heat isolation, fire fighting and the like. The method is simple in process flow and convenient for industrialized promotion; and the cost is good to control and the method has extreme economical value.
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Description

technical field

[0001] The invention belongs to the technical field of porous ceramic materials and secondary resource utilization. Provided is a method for preparing alumina-silicon carbide composite porous ceramics by using aluminum-silicon series industrial waste residue. Background technique

[0002] China is a big industrial country, whose annual output of crude steel accounts for more than half of the world's total output, and is also a major producer of major non-ferrous metal products such as copper, aluminum, lead, and zinc. There is no doubt that these reflect the progress of our country's economy and the enhancement of our national strength. But on the other hand, with the development of heavy industries such as coal, metallurgy, and electric power, people have to face the problem of deteriorating environment while enjoying the dividends of economic development.

[0003] For example, the rapid development of the power industry, while providing convenience for pe...

Examples

Embodiment 1

[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 .

Embodiment 2

[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 .

Embodiment 3

[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 .