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Effect of Preparation Conditions on Phase Formation, Densification, and Microstructure Evolution in La‐β‐Al 2 O 3 /Al 2 O 3 Composites
Author(s) -
BarreraSolano Carmen,
Esquivias Luis,
Messing Gary L.
Publication year - 1999
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.1151-2916.1999.tb01914.x
Subject(s) - boehmite , microstructure , materials science , grain growth , sol gel , phase (matter) , grain size , solid state , sintering , aluminium oxides , homogeneous , mineralogy , grain boundary , composite material , chemical engineering , aluminium , chemistry , nanotechnology , catalysis , combinatorics , mathematics , biochemistry , organic chemistry , engineering
In situ development of La‐ß‐Al 2 O 3 (LBA) platelets in alpha‐Al 2 O 3 was studied as a function of the preparation method: a conventional solid‐state reaction of commercial Al 2 O 3 powder and La(NO 3 ) 3 as well as a sol‐gel method starting with boehmite and the same La 2 O 3 precursor. In both cases, homogeneous distribution of the reinforcing phase was achieved, and a noteworthy inhibition of Al 2 O 3 grain growth resulted. However, samples prepared by solid‐state reaction densified more easily than those prepared via sol‐gel, but the formation of the LBA phase occurred at a lower temperature in samples prepared by the sol‐gel approach. Results on the correlation of the onset of LBA grain growth and densification to microstructure are discussed.