以湿化学法制备的纳米α-Al2O3粉体作为添加剂,MgO和SiO2为烧结助剂,对商用γ-Al2O3粉体预处理后,采用无压烧结工艺,有效的降低了烧结温度.在1450℃制备了高性能的氧化铝陶瓷,并对添加α-Al2O3纳米晶的作用机理进行了研究.
Nanocrystalline α-Al2O3 powder was prepared by a wet-chemical method calcining the dry NH4Al(OH)2CO3 precursor synthesized from NH4Al(SO4)2 and NH4HCO3. Alumina ceramics were fabricated by pressureless sintering process at 1450℃ from bimodal alumina powder mixtures with the prepared nanocrystalline component using MgO and SiO2 as additives. The effect of nanocrystalline α-Al2O3 component on alumina ceramics was also studied. The materials fabricated have better mechanical properties.
参考文献
| [1] | 李继光, 孙旭东, 茹洪强, 等. 材料研究学报, 1998, 12 (1): 105--107. [2] Zheng J, Carlson W B, Reed J S. J. Eur. Ceram. Soc., 1995, 15: 479--483. [3] Ravi B G, Chaim R, Gedanken A. Nanostructure Materials, 1999, 11 (7): 853--859. |
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