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Near‐Net‐Shaped (Ba,Sr)Al 2 Si 2 O 8 Bodies by the Oxidation of Machinable Metal‐Bearing Precursors
Author(s) -
Viers David S.,
Sandhage Kenneth H.
Publication year - 1999
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.1151-2916.1999.tb01755.x
Subject(s) - materials science , ball mill , metallurgy , metal , aluminosilicate , strontium , alkaline earth metal , composite material , mineralogy , chemistry , catalysis , biochemistry , organic chemistry
A novel process has been used to fabricate refractory aluminosilicate bodies of near net shape: the oxidation of machinable, alkaline‐earth‐metal‐bearing precursors. Ba–Sr–Al–Al 2 O 3 –SiO 2 precursors of similar molar volume as strontium‐doped celsian, (Ba,Sr)Al 2 Si 2 O 8 , were prepared by powder metallurgical processing. Precursor powder mixtures, obtained by high‐energy vibratory ball milling, were compacted and formed into bars or disks by uniaxial pressing. The bar‐shaped precursors were machined on a metal‐working lathe using hardened steel tooling. The shaped precursors were oxidized and converted into celsian. The resulting celsian bodies retained the shapes, and fine machined features, of the precursors. The measured changes in dimensions were small and in good agreement with calculated values.