中文摘要：

为了解决氧化铝陶瓷脆性大、均匀性差等问题，我们在微米氧化铝粉体中添加一定比例的纳米α-Al2O3粉，研究纳米α-Al2O3粉的添加和成型压力对微米氧化铝陶瓷显微结构和性能的影响。实验结果表明，在粉料挤压成型过程中，纳米α-Al2O3粉可填充到微米氧化铝粉体的孔隙之中，减小了孔隙尺寸；成型压力提高，可减少气孔数量，从而提高了陶瓷素坯的密度，改善了氧化铝陶瓷烧结后的密度和力学性能。

英文摘要：

To solve the brittleness of alumina ceramic, the addition of optimal proportion nano α-Al2O3 powders is considered in the micro alumina powders. The effect of adding nano α-Al2O3 powder and molding pressure on microstructure and properties of micron-sized alumina ceramic was investigated. The results showed that the amount of microhole were decreased with the molding pressure increasing. The nano α-Al2O3 powder was stuffed into pores formed from the packing of micron alumina powder when it extruded. The size of holes was minished. Accordingly the density of the green alumina ceramic was increased, bulk density and mechanical properties of alumina ceramic after sintering were improved.