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TEM Investigation of Impurity Phases and the Penetration of Liquid Aluminum in Hot Isostatically Pressed TiB 2 Compacts
Author(s) -
NordVarhaug Katrin
Publication year - 1996
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.1151-2916.1996.tb08566.x
Subject(s) - impurity , materials science , aluminium , microstructure , transmission electron microscopy , hot isostatic pressing , metallurgy , penetration (warfare) , phase (matter) , hot pressing , composite material , nanotechnology , chemistry , organic chemistry , operations research , engineering
The microstructure of materials compacted from commercially produced TiB 2 powders was investigated using transmission electron microscopy. A number of impurity phases that are introduced during the various processing stages were identified. After exposure to liquid aluminum, grain boundaries and triple junctions of TiB 2 were found to be penetrated by aluminum. In the penetrated regions pure aluminum, two aluminum oxides, and an (Al 2 OC) 1 ‐ x (AlN) x . phase were identified. A SiO 2 glass phase, introduced during hot isostatic pressing, is believed to be responsible for the formation of alumina. None of the other impurity phases were found to react with aluminum.