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Low‐Temperature High‐Pressure Consolidation of Amorphous Al 2 O 3 –15 mol% Y 2 O 3
Author(s) -
Thangamani Nithyanantham,
Gandhi Ashutosh S.,
Jayaram Vikram,
Chokshi Atul H.
Publication year - 2005
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.1551-2916.2005.00502.x
Subject(s) - amorphous solid , crystallization , materials science , hot pressing , consolidation (business) , pyrolysis , precipitation , analytical chemistry (journal) , mineralogy , chemical engineering , metallurgy , crystallography , chemistry , organic chemistry , business , physics , accounting , meteorology , engineering
This study examined pressure consolidation of amorphous Al 2 O 3 –15 mol% Y 2 O 3 powders prepared by co‐precipitation and spray pyrolysis. The two amorphous powders had similar true densities and crystallization sequences. Uniaxial hot pressing was carried out at 450°–600°C with a moderate pressure of 750 MPa. The co‐precipitated powder could be hot pressed to a maximum relative density of 98% and remained amorphous. Pressure adversely affected the densification of the spray‐pyrolyzed powder by favoring an early crystallization of γ‐Al 2 O 3 phase at 580°C. Plastic deformation of the amorphous phase is believed to be responsible for the large densification of the amorphous powders.