LIN  Liang

(Fujian Communications Technology College, Fuzhou 350007)

Abstract:A type of low cost porous ceramics was made by using suitable binder and fine silicon powder generated during iron alloy smelting process as main raw materials. The variation of porosity, bulk density and bending strength with different sintering temperatures of porous ceramics (by using phosphoric acid as binder) were discussed in this paper. XRD and SEM techniques were used to characterize the crystalline composition and microstructures. The results show that the best dosage of phosphoric acid is 2.0% and the best sintering temperature is 700℃. The main crystal phase of acquired porous ceramics is amorphous SiO₂. The porosity of the porous ceramics is up to 43.55%, water absorption is 34.19%, bulk density is 1.25 g/cm³ and bending strength is 28.50MPa under best preparing conditions.

Keywords:phosphoric acid, binder, porous ceramics, fine silicon powder