【摘要】 利用SR-CT技术观测了Al2O3(MgO)粉末的整个烧结过程,温度范围~1550℃,重建得到了粉体在不同温度下的微观形貌图像,计算得到了对应温度下的孔隙率,结合烧结理论对Al2O3(MgO)粉末烧结进行了分析。实验结果表明:1300℃时颗粒间开始形成烧结颈,1400℃至1500℃的过程中,气孔重新分布形成连续网络且发生球化,烧结颈长大,为烧结致密化最显著阶段,1500℃至1550℃为烧结后期,变化趋缓。更多还原

【Abstract】 In this paper,observation on the sintering evolution of Al2O3(MgO) powder was carried out by synchrotron radiation X-ray computed tomography technique.The temperature range was from room temperature to 1550℃.The three dimension images of internal microstructures of the powder at different temperatures were reconstructed and the porosities were calculated.Together with sintering theory the grain growth,the pore growth and densification behavior were investigated.The experiment showed that sintering necks was obviously formed at 1300℃.After that temperature,the necks grew up,the pores redistributed and formed continuous network and some pores tended to sphericize.The powder underwent remarkable densification process from 1400℃ to 1500℃,the evolutions slowed down from 1500℃ to 1550℃.更多还原