研究了沉淀法制备Al2O3－SiC纳米复合陶瓷的工艺过程，利用Al2O3从，γ相到α相的蠕虫状生长过程，使大部分纳米SiC颗粒位于Al2O3晶粒内．用沉淀法制得的、含有5vol％SiC的Al2O3－SiC纳米复合陶瓷，其强度为467MPa，韧性为4．7MPa·m1/2，与一般的Al2O3陶瓷相比有较大的提高，显示了沉淀法制备Al2O3－SiC纳米复合陶瓷的优点．
Al2O3-5vol% SiC nanoscale composite powder was prepared by the precipitation method.Al2O3-SiC nanocomposites were made by HP sintering. The strength of Al2O3-SiC nanocomposites is 467MPa, toughniess is 4. 7MPa.m1/2. Nano SiC particles were located in Al2O3 grains because of the transformation of Al2O3 from γ phase to α phase. This intragranular microstructure is effective in improving mechanical properties. Therefore, the precipitation method is a good way to fabricate Al2O3-SiC nanocomposites.
参考文献
| [1] | Zhao J, et al. J. Am. Ceram. Soc., 1993, 76: 503. 2 Niihara K. J. Ceram. Soc. Jpn., 1991, 99: 974. 3 Piciacchio A, et al. J. Am. Ceram. Soc., 1994, 77: 2157. 4 Ingram V, et al. J. Mater. Chem., 1996, 6: 73. 5 Dynys F, et al. J. am. Ceram. Soc., 1982, 65: 442. 6 Stearns L, et al. J. Eur. Ceram. Soc., 1992, 10: 473. |
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