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Microcavity Formation in Alumina Using Ti Templates I: Formation Conditions
Author(s) -
Goodshaw Heather J.,
Forrester Jennifer S.,
Hanson Ronald E.,
Kisi Erich H.,
Suaning Gregg J.
Publication year - 2009
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.1551-2916.2009.03079.x
Subject(s) - kirkendall effect , materials science , template , porosity , doping , ceramic , nanotechnology , alumina ceramic , diffusion , optoelectronics , composite material , metallurgy , physics , thermodynamics
It has been found that fully enclosed microcavities can be engineered within Al 2 O 3 ceramics using 125 μm diameter Ti wires as templates. A high‐energy milling pretreatment of the alumina causes diffusion of the Ti into the surrounding alumina leaving all of the Kirkendall porosity consolidated into a central cavity. Control experiments using unmilled alumina confirm the necessity of the milling procedure and experiments with different milling media have excluded incidental doping by milling induced contamination as a primary driver of cavity formation. The internal microcavities produced here may lead to new applications in small scale instrumentation and implantable therapeutic devices.