采用多物理场活化烧结微成形技术(简称 Micro-FAST)制备了氧化铝微型圆柱,研究了烧结温度对Micro-FAST制备氧化铝微型圆柱致密化过程的影响。结果表明,Micro-FAST的烧结致密化过程可分为4个阶段：预热阶段、升温阶段、保温阶段和冷却阶段,试样的线收缩主要发生在升温阶段；烧结温度是影响原子扩散系数的重要因素,随着烧结温度的升高,试样的线收缩率和相对密度均是增加的；Micro-FAST 制备氧化铝陶瓷的平均烧结活化能比传统真空烧结要低得多,说明Micro-FAST是一种活化烧结技术。
Alumina micro-cylinders were prepared by micro-forming fields activated sintering technology (Micro-FAST)and the effect of sintering temperature on the densification of micro-cylinders by Micro-FAST was re-searched in the paper.The results show that the process of densification by Micro-FAST can be divided into four stages including preheating period,temperature rising period,soaking stage and cooling stage,and sample line contraction occurs mainly in the heating stage.In addition,sintering temperature is the important factor influ-encing the atomic diffusion coefficient,in which the sample linear shrinkage and relative density increase with the raise of sintering temperature.Moreover,the average sintering activation energy of aluminum oxide ceram-ics prepared by Micro-FAST is much smaller than that of traditional vacuum sintering,which means that Mi-cro-FAST is a kind of activated sintering technology.
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