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本文用孔隙体积收缩法对γ-Fe 烧结机理进行了初步的探讨,得出γ-Fe致密化速度常数和温度的关系如下:D=17.68e■,并求出了不同温度下的致密化速度常数 D(cm~2/sec):1000℃—2.06×10~(-7);1100℃—7.8×10~(-7);1200℃—2.46×10~(-6);1250℃—4.142×10~(-6)。求出了γ-Fe 烧结时的活化能为 H=46200卡/克原子,与已知γ-Fe 烧结时体扩散激活动能67900卡/克原子～74200卡/克原子和晶介扩散激活能30000卡/克原子相比较,从而得出γ-Fe 的烧结机理为混合扩散机理,体积扩散、表面扩散、晶界扩散都起着重要作用。
In this paper, pore-volume shrinkage method was used to investigate the mechanism of γ-Fe sintering. The relationship between the γ-Fe densification rate constant and temperature is obtained as follows: D = 17.68e ·, and the densification speed Constant D (cm ~ 2 / sec): 1000 ° C -2.06 × 10 -7 ° C; 1100 ° C-7.8 × 10 -7 ° C; 1200 ° C -2.46 × 10 -6 ° C; × 10 ~ (-6). The activation energy of γ-Fe sintering was calculated to be H = 46200 cal / g atom, and the kinetic energy of diffusion activation is 67900 cal / g atom ~ 74200 cal / g atom and 30 000 activation energy of crystal-mediated diffusion It is concluded that the sintering mechanism of γ-Fe is a mixed diffusion mechanism, volume diffusion, surface diffusion and grain boundary diffusion all play an important role.