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Oxidation of Zirconium Diboride with Tungsten Carbide Additions
Author(s) -
Zhang Shi C.,
Hilmas Greg E.,
Fahrenholtz William G.
Publication year - 2011
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.1551-2916.2010.04216.x
Subject(s) - zirconium diboride , materials science , ceramic , tungsten carbide , tungsten , cubic zirconia , zirconium , sintering , isothermal process , metallurgy , zirconium carbide , solid solution , oxide , carbide , titanium diboride , chemical engineering , physics , engineering , thermodynamics
The oxidation resistance of zirconium diboride (ZrB 2 ) ceramics with tungsten carbide (WC) additions was studied. ZrB 2 ceramics, nominally pure and with WC additions of 4, 5, and 6 mol%, were densified by pressureless sintering. During heating, the WC that was added to the ceramic dissolved into the ZrB 2 matrix, forming a solid solution. Oxidation behavior was evaluated using isothermal furnace oxidation at 1500°C and 1600°C. The presence of tungsten reduced both the weight gain and oxide scale thickness compared with nominally pure ZrB 2 . After oxidation at 1600°C for 3 h, the thickness of the ZrO 2 outer scale was reduced from 4.7 mm for nominally pure ZrB 2 to 0.5 mm for the ceramic containing 6 mol% WC. Analysis showed that WC additions improved the oxidation resistance of ZrB 2 by changing the morphology of the zirconia scale formed during oxidation.