烧结激活能是研究物质烧结机理的重要参量.从实验得到的0.35μm、1μm以及2.5μm 3种粒径的α-Al2O3的恒速升温烧结曲线出发,通过Arrhenius关系拟合计算,发现激活能是一个变化的值.当选取整个温度区间进行拟合计算时,烧结激活能值大致可以分为前后两个阶段,前一阶段的激活能值要高于后一阶段的值;当拟合选取的温度区间较窄时,发现烧结过程中随着温度的升高,烧结激活能值先减小后增加.同时观察到坯体起始粒径越大,样品烧结激活能平均值越高.
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