Transformation and Microstructure Control in Boehmite‐Derived Alumina by Ferric Oxide Seeding

JAMES L. McARDLE, Gary Lynn Messing

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

Single‐crystal seed particles of α‐Fe2O3 were produced by aging ferric nitrate‐derived precipitates. Addition of these particles to boehmite (γ‐AlOOH) sols at concentrations up to 1014 particles/cm3 of dried gel (4.2 wt%) reduced the θ‐ to α‐Al2O3 transformation temperature from 1215° to 1085°C as measured by DTA at a heating rate of 10°/min. The addition of Fe(NO3)3 solution to boehmite at an equivalent Fe2O3 concentration of up to 8.1 wt% lowered the transformation temperature to <970°C. The increased nucleation frequency afforded by Fe2O3 particle and salt additions permitted the development of fully dense submicrometer α‐Al2O3 at <1250°C. Transformation control in alumina is discussed in terms of nucleation frequency and epitaxial effects. 1988 The American Ceramic Society

Original languageEnglish (US)
Pages (from-to)387-392
Number of pages6
JournalAdvanced Ceramic Materials
Volume3
Issue number4
DOIs
StatePublished - Jan 1 1988

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Aluminum Oxide
seeding
aluminum oxide
Particles (particulate matter)
microstructure
Nucleation
Alumina
oxide
boehmite
Microstructure
Oxides
Sols
Heating rate
Differential thermal analysis
nucleation
Seed
Precipitates
Gels
Aging of materials
Polymethyl Methacrylate

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

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Transformation and Microstructure Control in Boehmite‐Derived Alumina by Ferric Oxide Seeding. / McARDLE, JAMES L.; Messing, Gary Lynn.

In: Advanced Ceramic Materials, Vol. 3, No. 4, 01.01.1988, p. 387-392.

Research output: Contribution to journalArticle

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