Abstract:

Infrared-radiative ceramic materials for grain drying were prepared based on the characteristic infrared absorbance of grains. The sintering raw materials are mainly composed of Al₂O₃, SiO^₂, while Fe₂O₃ , CuO and Y₂O₃ are used as doping materials. The infrared radiances of the ceramics（mullite,mullite doped）, which was measured by infrared radiator in the wave band range from 2.5 to 15 μm, are varied from 0.845 to 0.933. An optimized composition, which is obtained by using an orthogonal experimental design method, is as follows:mullite（Al₂O₃∶SiO₂=3∶2）, Fe₂O₃ 2.5%, CuO 5%, and Y₂O₃ 2.5%.

Key words: non-meatllic inorganic material, infrared-radiative ceramic materials, mullite, grain drying