Precipitation of magnesium aluminum spinel from alumina-matrix solid solution: I, Fundamental concept and precipitation behavior

被引：8
作者：
机构：
[1] R and D Center Kagoshima, Kyocera Corporation, Kokubu
来源：
Wang, Yucong | 2000年 / American Ceramic Soc卷 / 83期
关键词：
Alumina - Crystal microstructure - Magnesium compounds - Nanostructured materials - Precipitation (chemical) - Solid solutions - Solubility - Transmission electron microscopy - X ray crystallography;
D O I：
10.1111/j.1151-2916.2000.tb01297.x
中图分类号：
学科分类号：
摘要：
Al2O3 ceramics with magnesium aluminum spinel dispersion particulates were produced by a precipitation treatment of Al2O3-matrix solid solution, (Al1-2x,Tix,Mgx)2O3. We successfully constructed the precipitation process for synthesizing the nanocomposite, using the solubility dependence of titanium and magnesium in Al2O3 on the valence of titanium. Changing of the valence of titanium from 4+ to 3+ was accomplished by controlling the heating atmosphere, and, thereby, magnesium precipitation was promoted. The precipitation behavior was characterized using X-ray diffractometry, and the microstructure was observed using transmission electron microscopy. We confirmed that magnesium aluminum spinel nanosized particulate were precipitated in the Al2O3 grain.
引用
收藏
页码：933 / 936
页数：3
相关论文
共 14 条
  • [1] Niihara K., New design concept of structural ceramics: Ceramic nanocomposites, J. Ceram. Soc. Jpn., 99, pp. 974-979, (1991)
  • [2] Sawaguchi A., Toda K., Niihara K., Mechanical and electrical properties of silicon nitride-silicon carbide nanocomposite material, J. Am. Ceram. Soc., 74, pp. 1142-1144, (1991)
  • [3] Nakahira A., Niihara K., Microstructure and high-temperature hardness of Al<sub>2</sub>O<sub>3</sub>-SiC nanocomposites, J. Mater. Sci. Jpn., 42, pp. 502-506, (1993)
  • [4] Kundu T.K., Mukherjee M., Chakravorty D., Sinha T.P., Growth of nano-α-Fe<sub>2</sub>O<sub>3</sub> in a titania matrix by the sol-gel route, J. Mater. Sci., 33, pp. 1759-1763, (1998)
  • [5] Johnson W.C., Grain boundary segregation in ceramics, Met. Trans., 8 A, pp. 1413-1422, (1977)
  • [6] Summerfelt S.R., Carter C.B., Interaction between dislocations and NiFe<sub>2</sub>O<sub>4</sub> precipitates in a NiO matrix, Mater. Res. Soc. Symp. Proc., 230, pp. 351-356, (1992)
  • [7] Jayaram V., The precipitation of Alpha-TiO<sub>2</sub> from supersaturated solutions of Ti in alumina, Philos. Mag. A., 57, pp. 525-542, (1988)
  • [8] Langensiepen R.A., Tressler R.E., Howell P.R., A preliminary study of precipitation in Ti<sup>4+</sup>-doped polycrystalline alumina, J. Mater. Sci., 18, pp. 2771-2776, (1983)
  • [9] Grahmaier J.G., Falckenberg H.R., Strength of flame-fusion-grown magnesium aluminum spinel, J. Am. Cram. Soc., 52, pp. 648-650, (1969)
  • [10] Donlon W.T., Mitchell T.E., Heuer A.H., Precipitation in non-stoichiometric spinel, J. Mater. Sci., 17, pp. 1389-1397, (1982)
12