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Increase in Phase Transition Temperature of Activated Alumina with Nano‐Zirconia Synthesized by Pulsed Wire Discharge
Author(s) -
Kinemuchi Yoshiaki,
Mouri Hiroshi,
Suzuki Tsuneo,
Suematsu Hisayuki,
Jiang Weihua,
Yatsui Kiyoshi
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03508.x
Subject(s) - cubic zirconia , zirconium , materials science , x ray photoelectron spectroscopy , zirconium dioxide , chemical engineering , analytical chemistry (journal) , metallurgy , ceramic , chemistry , chromatography , engineering
Activated alumina powders have been synthesized by using a novel dry process of pulsed wire discharge. The temperature of phase transition from activated alumina to α‐alumina and its variation caused by adding zirconia have been investigated. A mixture of activated alumina and zirconia was formed by mixing zirconium plasma with aluminum plasma and cooling together in an oxygen atmosphere. It was found that the transition temperature increased when the zirconia content ratio was increased. On the other hand, results of X‐ray diffraction and X‐ray photoelectron spectroscopy analysis indicated no substitution of zirconium in an alumina lattice. Thus, most of the zirconium atoms were located in zirconia particles on the surface and/or the grain boundary of alumina grains. Thus, it appears that the increase in the phase transition was caused by retardation of atomic diffusion at zirconia particles.