Abstract:

The influences of three factors‚such as gas contents in reducing atmosphere‚reducing temper-ature and reducing time‚on the reducing degree of ware sintering were quantitatively investigated by the tube furnace．The thickness of reducing layer was determined by measuring the color variation region on the ware cross section．XRD was adopted to analyze the ware phase transformation before and after the reducing process．The results indicate that the ceramic with 0．47％ （mass fraction） of Fe 2 O 3 and 11．5mm of thickness is completely reduced in two minutes under the reducing conditions of1100℃ and 4％ （mass fraction） of CO．

Key words: reducing atmosphere, sintering, ceramic