Abstract: Super fine sponge-Ni material was obtained by the method of chemistry, which has the surface area of 74. 7m²/g and average of particle size of 2-5nm. After sintering in the range of 375～600℃ and in different gases at each time interval, the samples were taken out and instrumental methods of SSA, SEM, TEM, XRD were used to detect their sintering extents respectively. It is found that the sintering takes place at 400℃ evidently; sintering reduces the surface area, increases the particle size, and develops crystallization: and that in different gases the SSA follows the order: He<N₂<H₂In the present work the sintering rate equationis established. it is advanced that during the initial fast sintering stage,the main mechanism is particle migrationi while at the following slow sintering stage,the main mechanism is atom migration. The accompanying phenomena in sintering process are discussed also.

Key words: Super fine sponge-Ni, Sintering extent, Rate equation, Mechanism of particlemigration and of atom migration