High‐Pressure Sintering of Nanocrystalline γAl2O3
- 1 November 1996
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 79 (11) , 2989-2992
- https://doi.org/10.1111/j.1151-2916.1996.tb08741.x
Abstract
High‐pressure sintering of nanocrystalline γ‐A12O3 has been studied over a temperature range of 923‐1323 K and at a pressure of 1 GPa. The γ‐Al2O3 to α‐Al2O3 transformation temperature changed from 1473 K without pressure to ∼1023 K at 1 GPa. Full density was obtained at 1273 and 1323 K in 10 min. The microhardness value of fully dense α‐alumina with a grain size of 142 nm was found to be 25.3 ± 0.8 GPa. The Hall‐Petch slope for the very fine grain size range is different from that of the coarse‐grained alumina.Keywords
This publication has 14 references indexed in Scilit:
- Plasma activated sintering of nanocrystalline γ-Al2O3Nanostructured Materials, 1995
- Grain Size Dependence of Hardness in Dense Submicrometer AluminaJournal of the American Ceramic Society, 1995
- Submicrometer Transparent Alumina by Sinter Forging Seeded γ‐Al2O3 PowdersJournal of the American Ceramic Society, 1995
- Microwave sintering of nanocrystalline γ-Al2O3Nanostructured Materials, 1994
- Porosity-grain growth relationships in the sintering of nanocrystalline ceramicsNanostructured Materials, 1993
- Sintering and grain growth in nanocrystalline ceramicsNanostructured Materials, 1992
- Sintering characteristics of nanocrystalline TiO2Journal of Materials Research, 1990
- Determination of Residual Surface Stresses Caused by Grinding in Polycrystalline Al2O3Journal of the American Ceramic Society, 1983
- Microhardness of a Fine‐Grain‐Size Al2O3Journal of the American Ceramic Society, 1979
- Synergetic Pressure‐Sintering of Al2O3Journal of the American Ceramic Society, 1972