Near‐Net‐Shaped (Ba,Sr)Al 2 Si 2 O 8 Bodies by the Oxidation of Machinable Metal‐Bearing Precursors

• Published in: Journal of the American Ceramic Society Vol. 82; no. 1; pp. 249 - 252
• Main Authors: Viers, David S., Sandhage, Kenneth H.
• Format: Journal Article
• Language: English
• Published: 01-01-1999
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.1999.tb01755.x

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.