Synthesis and Properties of CaAl2O4‐Coated AI2O3 Microcomposite Powders

Priyadarshi G. Desai, Zhengkui Xu, Jennifer A. Lewis

Research output: Contribution to journalArticlepeer-review


Novel microcomposite powders, consisting of inert cores (α-Al2O3) surrounded by reactive cement-based coatings (CaAl2O4), were synthesized by a modified Pechini process. The evolution of the crystalline CaAl2O4 phase during calcination was studied using multiple analytical techniques, including DRIFTS, 13C and 27Al MAS FT-NMR, and XRD, for both pure CaAl2O4 and CaAl2O4-coated Al2O3 precursor powders. In both powders, decomposition proceeded via hydrocarbon chain scission and removal of ester groups at low temperatures (T≤450 °C), followed by the formation of inorganic carbonates at higher temperatures (T≥450 °C). These decomposition processes were accelerated by the underlying Al2O3 cores. Transmission electron microscopy (TEM) of the fully calcined powders showed that the inert α-Al2O3 particles were surrounded by relatively uniform CaAl2O4 coatings ranging in thickness from approximately 10 to 100 nm.

Original languageEnglish (US)
Pages (from-to)2881-2888
Number of pages8
JournalJournal of the American Ceramic Society
Issue number11
StatePublished - Nov 1995
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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