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Sintering of Translucent Alumina in a Nitrogen–Hydrogen Gas Atmosphere
Author(s) -
Wei George C.,
Rhodes William H.
Publication year - 2000
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.1151-2916.2000.tb01443.x
Subject(s) - sintering , hydrogen , materials science , atmosphere (unit) , nitrogen , oxygen , reducing atmosphere , chemical engineering , metallurgy , mineralogy , inorganic chemistry , chemistry , thermodynamics , organic chemistry , engineering , physics
The sintering of alumina doped with magnesia‐based additives to translucency previously has been possible only in atmospheres of hydrogen or oxygen or under vacuum. This paper reports on the sintering of alumina in N 2 –H 2 atmospheres that contain as little as 2% H 2 , where optical transparency that is equivalent to that of normal H 2 sintering is achieved. In an effort to explain these results, experiments that vary the content of H 2 and H 2 O, as well as the changes in the dynamic atmosphere, have been conducted. The evidence indicates that the final‐stage sintering involves a point‐defect pair mechanism that includes hydrogen interstitials and nitrogen solutes.