主烧结曲线对于预测陶瓷的烧结行为非常有用,以主烧结曲线理论为基础,对亚微米级a-Al5 O3(平均粒径为350nm)的恒速无压烧结行为进行了研究.根据Hansen提出的全期烧结模型,结合低升温速率条件下热膨胀仪记录的烧结数据建立了α-Al2O3的主烧结曲线,并由此得到其烧结过程中的表观激活能为1035kJ/mol.为验证所建立主烧结曲线的有效性,对同批次坯体样品进行不同路径的烧结,用Archimedes法实测烧结体密度,所测结果与主烧结曲线预测的结果相一致,从而证明了所建立主烧结曲线的有效性.因此亚微米级α-Al2O3主烧结曲线对烧结路径不敏感,可以对样品收缩率和最终相对密度进行预测,反之,根据目标相对密度可以制定相应的烧结制度.
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