Effect of preparation conditions on phase formation, densification, and microstructure evolution in La-β-Al2O3/Al2O3 composites

Carmen Barrera-Solano, Luis Esquivias, Gary L. Messing

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26 Scopus citations

Abstract

In situ development of La-β-Al2O3 (LBA) platelets in α-Al2O3 was studied as a function of the preparation method: a conventional solid-state reaction of commercial A12O3 powder and La(NO3)3 as well as a sol-gel method starting with boehmite and the same La2O3 precursor. In both cases, homogeneous distribution of the reinforcing phase was achieved, and a noteworthy inhibition of A12O3 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.

Original languageEnglish (US)
Pages (from-to)1318-1324
Number of pages7
JournalJournal of the American Ceramic Society
Volume82
Issue number5
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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