TRANSPARENT NANOCRYSTALLINE BULK ALUMINA OBTAINED AT 7.7 GPa AND 800 C

TRANSPARENT NANOCRYSTALLINE BULK ALUMINA OBTAINED AT 7.7 GPa AND 800 C

Transparent nanocrystalline bulk alumina obtained at 7.7 GPa and 800 C had an average grain size of about 150 nm and an in-line transmission of 71% for a wavelength of 640 nm and a thickness of 0.8 mm. This is thought to be the lowest temperature at which highly transparent alumina has been obtained...

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Veröffentlicht in:Scripta materialia 2013-01, Vol.69 (5), p.362-365
Hauptverfasser: Nishiyama, N, Taniguchi, T, Ohfuji, H, Yoshida, K, Wakai, F, Kim, B-N, Yoshida, H, Higo, Y, Holzheid, A, Beermann, O, Irifune, T, Sakka, Y, Funakoshi, K-i
Format: Artikel
Sprache:eng
Schlagworte:
Aluminum oxide
Fracture toughness
Grain size
Hardness
Microhardness
Nanocrystals
Wavelengths
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Zusammenfassung:Transparent nanocrystalline bulk alumina obtained at 7.7 GPa and 800 C had an average grain size of about 150 nm and an in-line transmission of 71% for a wavelength of 640 nm and a thickness of 0.8 mm. This is thought to be the lowest temperature at which highly transparent alumina has been obtained. The values of microhardness and fracture toughness were 25.5 plus or minus 0.3 GPa and 2.9 plus or minus 0.3 MPa.m1/2, respectively. The hardness value was consistent with the previously determined Hall-Petch relation and fracture toughness was independent of grain size.
ISSN:1359-6462
DOI:10.1016/j.scriptamat.2013.05.017