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Precipitation of Magnesium Aluminum Spinel from Alumina‐Matrix Solid Solution: I, Fundamental Concept and Precipitation Behavior
Author(s) -
Wang Yucong,
Fujimoto Tetsuro,
Maruyama Hiroshi,
Koga Kazunori
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01297.x
Subject(s) - spinel , magnesium , precipitation , materials science , microstructure , titanium , aluminium , metallurgy , chemical engineering , valence (chemistry) , solubility , coprecipitation , solid solution , inorganic chemistry , mineralogy , chemistry , physics , organic chemistry , meteorology , engineering
Al 2 O 3 ceramics with magnesium aluminum spinel dispersion particulates were produced by a precipitation treatment of Al 2 O 3 ‐matrix solid solution, (Al 1—2x ,Ti x ,Mg x ) 2 O 3 . We successfully constructed the precipitation process for synthesizing the nanocomposite, using the solubility dependence of titanium and magnesium in Al 2 O 3 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 Al 2 O 3 grain.