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 language | English (US) |
|---|---|
| Pages (from-to) | 387-392 |
| Number of pages | 6 |
| Journal | Advanced Ceramic Materials |
| Volume | 3 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jan 1 1988 |
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All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Geology
- Geochemistry and Petrology
- Materials Chemistry
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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 journal › Article
TY - JOUR
T1 - Transformation and Microstructure Control in Boehmite‐Derived Alumina by Ferric Oxide Seeding
AU - McARDLE, JAMES L.
AU - Messing, Gary Lynn
PY - 1988/1/1
Y1 - 1988/1/1
N2 - 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
AB - 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
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U2 - 10.1111/j.1551-2916.1988.tb00240.x
DO - 10.1111/j.1551-2916.1988.tb00240.x
M3 - Article
VL - 3
SP - 387
EP - 392
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 4
ER -