TY - JOUR
T1 - Low‐Temperature Sintering of Seeded Sol—Gel‐Derived, ZrO2‐Toughened Al2O3 Composites
AU - Messing, Gary L.
AU - Kumagai, Masato
PY - 1989/1
Y1 - 1989/1
N2 - Seeding a mixture of boehmite (AIOOH) and colloidal ZrO2 with α‐alumina particles and sintering at 1400°C for 100 min results in 98% density. The low sintering temperature, relative to conventional powder processing, is a result of the small alumina particle size (∼0.3 μm) obtained during the θ‐to α‐alumina transformation, homogeneous mixing, and the uniform structure of the sol‐gel system. Complete retention of pure ZrO2 in the tetragonal phase was obtained to 14 vol% ZTA because of the low‐temperature sintering. The critical grain size for tetragonal ZrO2 was determined to be ∼0.4 μm for the 14 vol% ZrO2—Al2O3 composite. From these results it is proposed that seeded boehmite gels offer significant advantages for process control and alumina matrix composite fabrication.
AB - Seeding a mixture of boehmite (AIOOH) and colloidal ZrO2 with α‐alumina particles and sintering at 1400°C for 100 min results in 98% density. The low sintering temperature, relative to conventional powder processing, is a result of the small alumina particle size (∼0.3 μm) obtained during the θ‐to α‐alumina transformation, homogeneous mixing, and the uniform structure of the sol‐gel system. Complete retention of pure ZrO2 in the tetragonal phase was obtained to 14 vol% ZTA because of the low‐temperature sintering. The critical grain size for tetragonal ZrO2 was determined to be ∼0.4 μm for the 14 vol% ZrO2—Al2O3 composite. From these results it is proposed that seeded boehmite gels offer significant advantages for process control and alumina matrix composite fabrication.
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U2 - 10.1111/j.1151-2916.1989.tb05950.x
DO - 10.1111/j.1151-2916.1989.tb05950.x
M3 - Article
AN - SCOPUS:0024478577
SN - 0002-7820
VL - 72
SP - 40
EP - 44
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 1
ER -