Abstract
Low-cost porous ceramic from fly ash with alumina as the pore-forming agent was produced. The effect of the alumina content on line shrink, bulk density, mechanical strength, porosity, and phase composition of porous ceramic were investigated in detail. The results showed that the addition of alumina can help to improve the porosity and then it can change the pore structure of porous ceramic. Meanwhile, the addition of alumina can react with SiO2 in fly ash which can form the mullite. With the increase of alumina content, the content of quartz decreased gradually, while the alumina and mullite increased. Furthermore, the pore size becomes uniform and the permeability increased gradually. After sintering at 1250 ℃ for 0.5 h, the porous ceramic has been obtained the bending strength of ≥ 35MPa and the porosity of ≥ 28% with the addition content of alumina (25 wt%).
Highlights
As a kind of special function ceramics, porous ceramic has been widely used in the fields of gas and liquid filtration, purification, separation, thermal insulation and other sides with the advantages of their high porosity, high temperature resistance, good corrosion resistance, and high chemical stability [1,2,3,4]
Porous ceramics are often prepared from Al2 O3 [5], SiO2 [6], ZrO2 [7], TiO2 [8], SiC [9], and their composite oxides [10] as the main raw materials
The products made from fly ash, and its cost of raw materials can be approximated as freight
Summary
As a kind of special function ceramics, porous ceramic has been widely used in the fields of gas and liquid filtration, purification, separation, thermal insulation and other sides with the advantages of their high porosity, high temperature resistance, good corrosion resistance, and high chemical stability [1,2,3,4]. In order to reduce fabrication cost, several effective methods have been developed such as low-temperature sintering aids and the cheap cost of raw materials [12]. In order to increase the porosity, some pore-forming agents are used, Traditionally, the porosity of the porous ceramic depends on the particle size distribution of the raw which burn out during the sintering, such as carbon powder, fiber, wood chips, and starch [21,22]. The pores produced by this method caused a sharp reduction in bending strength It burn out during the sintering, such as carbon powder, fiber, wood chips, and starch [21,22]. The fabrication of low-cost porous ceramic via the fly ash with alumina the pore-forming agents has been reported.
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